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* @module ol/util\n */\n\n/**\n * @return {?} Any return.\n */\nexport function abstract() {\n  return /** @type {?} */ ((function() {\n    throw new Error('Unimplemented abstract method.');\n  })());\n}\n\n/**\n * Inherit the prototype methods from one constructor into another.\n *\n * Usage:\n *\n *     function ParentClass(a, b) { }\n *     ParentClass.prototype.foo = function(a) { }\n *\n *     function ChildClass(a, b, c) {\n *       // Call parent constructor\n *       ParentClass.call(this, a, b);\n *     }\n *     inherits(ChildClass, ParentClass);\n *\n *     var child = new ChildClass('a', 'b', 'see');\n *     child.foo(); // This works.\n *\n * @param {!Function} childCtor Child constructor.\n * @param {!Function} parentCtor Parent constructor.\n * @function module:ol.inherits\n * @deprecated\n * @api\n */\nexport function inherits(childCtor, parentCtor) {\n  childCtor.prototype = Object.create(parentCtor.prototype);\n  childCtor.prototype.constructor = childCtor;\n}\n\n/**\n * Counter for getUid.\n * @type {number}\n * @private\n */\nlet uidCounter_ = 0;\n\n/**\n * Gets a unique ID for an object. This mutates the object so that further calls\n * with the same object as a parameter returns the same value. Unique IDs are generated\n * as a strictly increasing sequence. Adapted from goog.getUid.\n *\n * @param {Object} obj The object to get the unique ID for.\n * @return {string} The unique ID for the object.\n * @function module:ol.getUid\n * @api\n */\nexport function getUid(obj) {\n  return obj.ol_uid || (obj.ol_uid = String(++uidCounter_));\n}\n\n/**\n * OpenLayers version.\n * @type {string}\n */\nexport const VERSION = 'latest';\n","/**\n * @module ol/AssertionError\n */\nimport {VERSION} from './util.js';\n\n/**\n * Error object thrown when an assertion failed. This is an ECMA-262 Error,\n * extended with a `code` property.\n * See https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Error.\n */\nclass AssertionError extends Error {\n\n  /**\n   * @param {number} code Error code.\n   */\n  constructor(code) {\n    const path = VERSION === 'latest' ? VERSION : 'v' + VERSION.split('-')[0];\n    const message = 'Assertion failed. See https://openlayers.org/en/' + path +\n    '/doc/errors/#' + code + ' for details.';\n\n    super(message);\n\n    /**\n     * Error code. The meaning of the code can be found on\n     * https://openlayers.org/en/latest/doc/errors/ (replace `latest` with\n     * the version found in the OpenLayers script's header comment if a version\n     * other than the latest is used).\n     * @type {number}\n     * @api\n     */\n    this.code = code;\n\n    /**\n     * @type {string}\n     */\n    this.name = 'AssertionError';\n\n    // Re-assign message, see https://github.com/Rich-Harris/buble/issues/40\n    this.message = message;\n  }\n\n}\n\nexport default AssertionError;\n","/**\n * @module ol/CollectionEventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  /**\n   * Triggered when an item is added to the collection.\n   * @event module:ol/Collection.CollectionEvent#add\n   * @api\n   */\n  ADD: 'add',\n  /**\n   * Triggered when an item is removed from the collection.\n   * @event module:ol/Collection.CollectionEvent#remove\n   * @api\n   */\n  REMOVE: 'remove'\n};\n","/**\n * @module ol/ObjectEventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  /**\n   * Triggered when a property is changed.\n   * @event module:ol/Object.ObjectEvent#propertychange\n   * @api\n   */\n  PROPERTYCHANGE: 'propertychange'\n};\n","/**\n * @module ol/obj\n */\n\n\n/**\n * Polyfill for Object.assign().  Assigns enumerable and own properties from\n * one or more source objects to a target object.\n * See https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign.\n *\n * @param {!Object} target The target object.\n * @param {...Object} var_sources The source object(s).\n * @return {!Object} The modified target object.\n */\nexport const assign = (typeof Object.assign === 'function') ? Object.assign : function(target, var_sources) {\n  if (target === undefined || target === null) {\n    throw new TypeError('Cannot convert undefined or null to object');\n  }\n\n  const output = Object(target);\n  for (let i = 1, ii = arguments.length; i < ii; ++i) {\n    const source = arguments[i];\n    if (source !== undefined && source !== null) {\n      for (const key in source) {\n        if (source.hasOwnProperty(key)) {\n          output[key] = source[key];\n        }\n      }\n    }\n  }\n  return output;\n};\n\n\n/**\n * Removes all properties from an object.\n * @param {Object} object The object to clear.\n */\nexport function clear(object) {\n  for (const property in object) {\n    delete object[property];\n  }\n}\n\n\n/**\n * Get an array of property values from an object.\n * @param {Object<K,V>} object The object from which to get the values.\n * @return {!Array<V>} The property values.\n * @template K,V\n */\nexport function getValues(object) {\n  const values = [];\n  for (const property in object) {\n    values.push(object[property]);\n  }\n  return values;\n}\n\n\n/**\n * Determine if an object has any properties.\n * @param {Object} object The object to check.\n * @return {boolean} The object is empty.\n */\nexport function isEmpty(object) {\n  let property;\n  for (property in object) {\n    return false;\n  }\n  return !property;\n}\n","/**\n * @module ol/events\n */\nimport {clear} from './obj.js';\n\n\n/**\n * Key to use with {@link module:ol/Observable~Observable#unByKey}.\n * @typedef {Object} EventsKey\n * @property {Object} [bindTo]\n * @property {ListenerFunction} [boundListener]\n * @property {boolean} callOnce\n * @property {number} [deleteIndex]\n * @property {ListenerFunction} listener\n * @property {import(\"./events/Target.js\").EventTargetLike} target\n * @property {string} type\n * @api\n */\n\n\n/**\n * Listener function. This function is called with an event object as argument.\n * When the function returns `false`, event propagation will stop.\n *\n * @typedef {function((Event|import(\"./events/Event.js\").default)): (void|boolean)} ListenerFunction\n * @api\n */\n\n\n/**\n * @param {EventsKey} listenerObj Listener object.\n * @return {ListenerFunction} Bound listener.\n */\nexport function bindListener(listenerObj) {\n  const boundListener = function(evt) {\n    const listener = listenerObj.listener;\n    const bindTo = listenerObj.bindTo || listenerObj.target;\n    if (listenerObj.callOnce) {\n      unlistenByKey(listenerObj);\n    }\n    return listener.call(bindTo, evt);\n  };\n  listenerObj.boundListener = boundListener;\n  return boundListener;\n}\n\n\n/**\n * Finds the matching {@link module:ol/events~EventsKey} in the given listener\n * array.\n *\n * @param {!Array<!EventsKey>} listeners Array of listeners.\n * @param {!Function} listener The listener function.\n * @param {Object=} opt_this The `this` value inside the listener.\n * @param {boolean=} opt_setDeleteIndex Set the deleteIndex on the matching\n *     listener, for {@link module:ol/events~unlistenByKey}.\n * @return {EventsKey|undefined} The matching listener object.\n */\nexport function findListener(listeners, listener, opt_this, opt_setDeleteIndex) {\n  let listenerObj;\n  for (let i = 0, ii = listeners.length; i < ii; ++i) {\n    listenerObj = listeners[i];\n    if (listenerObj.listener === listener &&\n        listenerObj.bindTo === opt_this) {\n      if (opt_setDeleteIndex) {\n        listenerObj.deleteIndex = i;\n      }\n      return listenerObj;\n    }\n  }\n  return undefined;\n}\n\n\n/**\n * @param {import(\"./events/Target.js\").EventTargetLike} target Target.\n * @param {string} type Type.\n * @return {Array<EventsKey>|undefined} Listeners.\n */\nexport function getListeners(target, type) {\n  const listenerMap = getListenerMap(target);\n  return listenerMap ? listenerMap[type] : undefined;\n}\n\n\n/**\n * Get the lookup of listeners.\n * @param {Object} target Target.\n * @param {boolean=} opt_create If a map should be created if it doesn't exist.\n * @return {!Object<string, Array<EventsKey>>} Map of\n *     listeners by event type.\n */\nfunction getListenerMap(target, opt_create) {\n  let listenerMap = target.ol_lm;\n  if (!listenerMap && opt_create) {\n    listenerMap = target.ol_lm = {};\n  }\n  return listenerMap;\n}\n\n\n/**\n * Remove the listener map from a target.\n * @param {Object} target Target.\n */\nfunction removeListenerMap(target) {\n  delete target.ol_lm;\n}\n\n\n/**\n * Clean up all listener objects of the given type.  All properties on the\n * listener objects will be removed, and if no listeners remain in the listener\n * map, it will be removed from the target.\n * @param {import(\"./events/Target.js\").EventTargetLike} target Target.\n * @param {string} type Type.\n */\nfunction removeListeners(target, type) {\n  const listeners = getListeners(target, type);\n  if (listeners) {\n    for (let i = 0, ii = listeners.length; i < ii; ++i) {\n      /** @type {import(\"./events/Target.js\").default} */ (target).\n        removeEventListener(type, listeners[i].boundListener);\n      clear(listeners[i]);\n    }\n    listeners.length = 0;\n    const listenerMap = getListenerMap(target);\n    if (listenerMap) {\n      delete listenerMap[type];\n      if (Object.keys(listenerMap).length === 0) {\n        removeListenerMap(target);\n      }\n    }\n  }\n}\n\n\n/**\n * Registers an event listener on an event target. Inspired by\n * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html\n *\n * This function efficiently binds a `listener` to a `this` object, and returns\n * a key for use with {@link module:ol/events~unlistenByKey}.\n *\n * @param {import(\"./events/Target.js\").EventTargetLike} target Event target.\n * @param {string} type Event type.\n * @param {ListenerFunction} listener Listener.\n * @param {Object=} opt_this Object referenced by the `this` keyword in the\n *     listener. Default is the `target`.\n * @param {boolean=} opt_once If true, add the listener as one-off listener.\n * @return {EventsKey} Unique key for the listener.\n */\nexport function listen(target, type, listener, opt_this, opt_once) {\n  const listenerMap = getListenerMap(target, true);\n  let listeners = listenerMap[type];\n  if (!listeners) {\n    listeners = listenerMap[type] = [];\n  }\n  let listenerObj = findListener(listeners, listener, opt_this, false);\n  if (listenerObj) {\n    if (!opt_once) {\n      // Turn one-off listener into a permanent one.\n      listenerObj.callOnce = false;\n    }\n  } else {\n    listenerObj = /** @type {EventsKey} */ ({\n      bindTo: opt_this,\n      callOnce: !!opt_once,\n      listener: listener,\n      target: target,\n      type: type\n    });\n    /** @type {import(\"./events/Target.js\").default} */ (target).\n      addEventListener(type, bindListener(listenerObj));\n    listeners.push(listenerObj);\n  }\n\n  return listenerObj;\n}\n\n\n/**\n * Registers a one-off event listener on an event target. Inspired by\n * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html\n *\n * This function efficiently binds a `listener` as self-unregistering listener\n * to a `this` object, and returns a key for use with\n * {@link module:ol/events~unlistenByKey} in case the listener needs to be\n * unregistered before it is called.\n *\n * When {@link module:ol/events~listen} is called with the same arguments after this\n * function, the self-unregistering listener will be turned into a permanent\n * listener.\n *\n * @param {import(\"./events/Target.js\").EventTargetLike} target Event target.\n * @param {string} type Event type.\n * @param {ListenerFunction} listener Listener.\n * @param {Object=} opt_this Object referenced by the `this` keyword in the\n *     listener. Default is the `target`.\n * @return {EventsKey} Key for unlistenByKey.\n */\nexport function listenOnce(target, type, listener, opt_this) {\n  return listen(target, type, listener, opt_this, true);\n}\n\n\n/**\n * Unregisters an event listener on an event target. Inspired by\n * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html\n *\n * To return a listener, this function needs to be called with the exact same\n * arguments that were used for a previous {@link module:ol/events~listen} call.\n *\n * @param {import(\"./events/Target.js\").EventTargetLike} target Event target.\n * @param {string} type Event type.\n * @param {ListenerFunction} listener Listener.\n * @param {Object=} opt_this Object referenced by the `this` keyword in the\n *     listener. Default is the `target`.\n */\nexport function unlisten(target, type, listener, opt_this) {\n  const listeners = getListeners(target, type);\n  if (listeners) {\n    const listenerObj = findListener(listeners, listener, opt_this, true);\n    if (listenerObj) {\n      unlistenByKey(listenerObj);\n    }\n  }\n}\n\n\n/**\n * Unregisters event listeners on an event target. Inspired by\n * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html\n *\n * The argument passed to this function is the key returned from\n * {@link module:ol/events~listen} or {@link module:ol/events~listenOnce}.\n *\n * @param {EventsKey} key The key.\n */\nexport function unlistenByKey(key) {\n  if (key && key.target) {\n    /** @type {import(\"./events/Target.js\").default} */ (key.target).\n      removeEventListener(key.type, key.boundListener);\n    const listeners = getListeners(key.target, key.type);\n    if (listeners) {\n      const i = 'deleteIndex' in key ? key.deleteIndex : listeners.indexOf(key);\n      if (i !== -1) {\n        listeners.splice(i, 1);\n      }\n      if (listeners.length === 0) {\n        removeListeners(key.target, key.type);\n      }\n    }\n    clear(key);\n  }\n}\n\n\n/**\n * Unregisters all event listeners on an event target. Inspired by\n * https://google.github.io/closure-library/api/source/closure/goog/events/events.js.src.html\n *\n * @param {import(\"./events/Target.js\").EventTargetLike} target Target.\n */\nexport function unlistenAll(target) {\n  const listenerMap = getListenerMap(target);\n  if (listenerMap) {\n    for (const type in listenerMap) {\n      removeListeners(target, type);\n    }\n  }\n}\n","/**\n * @module ol/Disposable\n */\n\n/**\n * @classdesc\n * Objects that need to clean up after themselves.\n */\nclass Disposable {\n\n  constructor() {\n    /**\n     * The object has already been disposed.\n     * @type {boolean}\n     * @private\n     */\n    this.disposed_ = false;\n  }\n\n  /**\n   * Clean up.\n   */\n  dispose() {\n    if (!this.disposed_) {\n      this.disposed_ = true;\n      this.disposeInternal();\n    }\n  }\n\n  /**\n   * Extension point for disposable objects.\n   * @protected\n   */\n  disposeInternal() {}\n}\n\nexport default Disposable;\n","/**\n * @module ol/functions\n */\n\n/**\n * Always returns true.\n * @returns {boolean} true.\n */\nexport function TRUE() {\n  return true;\n}\n\n/**\n * Always returns false.\n * @returns {boolean} false.\n */\nexport function FALSE() {\n  return false;\n}\n\n/**\n * A reusable function, used e.g. as a default for callbacks.\n *\n * @return {void} Nothing.\n */\nexport function VOID() {}\n","/**\n * @module ol/events/Event\n */\n\n/**\n * @classdesc\n * Stripped down implementation of the W3C DOM Level 2 Event interface.\n * See https://www.w3.org/TR/DOM-Level-2-Events/events.html#Events-interface.\n *\n * This implementation only provides `type` and `target` properties, and\n * `stopPropagation` and `preventDefault` methods. It is meant as base class\n * for higher level events defined in the library, and works with\n * {@link module:ol/events/Target~Target}.\n */\nclass Event {\n\n  /**\n   * @param {string} type Type.\n   */\n  constructor(type) {\n\n    /**\n     * @type {boolean}\n     */\n    this.propagationStopped;\n\n    /**\n     * The event type.\n     * @type {string}\n     * @api\n     */\n    this.type = type;\n\n    /**\n     * The event target.\n     * @type {Object}\n     * @api\n     */\n    this.target = null;\n  }\n\n  /**\n   * Stop event propagation.\n   * @api\n   */\n  preventDefault() {\n    this.propagationStopped = true;\n  }\n\n  /**\n   * Stop event propagation.\n   * @api\n   */\n  stopPropagation() {\n    this.propagationStopped = true;\n  }\n\n}\n\n\n/**\n * @param {Event|import(\"./Event.js\").default} evt Event\n */\nexport function stopPropagation(evt) {\n  evt.stopPropagation();\n}\n\n\n/**\n * @param {Event|import(\"./Event.js\").default} evt Event\n */\nexport function preventDefault(evt) {\n  evt.preventDefault();\n}\n\nexport default Event;\n","/**\n * @module ol/events/Target\n */\nimport Disposable from '../Disposable.js';\nimport {unlistenAll} from '../events.js';\nimport {VOID} from '../functions.js';\nimport Event from './Event.js';\n\n\n/**\n * @typedef {EventTarget|Target} EventTargetLike\n */\n\n\n/**\n * @classdesc\n * A simplified implementation of the W3C DOM Level 2 EventTarget interface.\n * See https://www.w3.org/TR/2000/REC-DOM-Level-2-Events-20001113/events.html#Events-EventTarget.\n *\n * There are two important simplifications compared to the specification:\n *\n * 1. The handling of `useCapture` in `addEventListener` and\n *    `removeEventListener`. There is no real capture model.\n * 2. The handling of `stopPropagation` and `preventDefault` on `dispatchEvent`.\n *    There is no event target hierarchy. When a listener calls\n *    `stopPropagation` or `preventDefault` on an event object, it means that no\n *    more listeners after this one will be called. Same as when the listener\n *    returns false.\n */\nclass Target extends Disposable {\n  constructor() {\n\n    super();\n\n    /**\n     * @private\n     * @type {!Object<string, number>}\n     */\n    this.pendingRemovals_ = {};\n\n    /**\n     * @private\n     * @type {!Object<string, number>}\n     */\n    this.dispatching_ = {};\n\n    /**\n     * @private\n     * @type {!Object<string, Array<import(\"../events.js\").ListenerFunction>>}\n     */\n    this.listeners_ = {};\n\n  }\n\n  /**\n   * @param {string} type Type.\n   * @param {import(\"../events.js\").ListenerFunction} listener Listener.\n   */\n  addEventListener(type, listener) {\n    let listeners = this.listeners_[type];\n    if (!listeners) {\n      listeners = this.listeners_[type] = [];\n    }\n    if (listeners.indexOf(listener) === -1) {\n      listeners.push(listener);\n    }\n  }\n\n  /**\n   * Dispatches an event and calls all listeners listening for events\n   * of this type. The event parameter can either be a string or an\n   * Object with a `type` property.\n   *\n   * @param {{type: string,\n   *     target: (EventTargetLike|undefined),\n   *     propagationStopped: (boolean|undefined)}|\n   *     import(\"./Event.js\").default|string} event Event object.\n   * @return {boolean|undefined} `false` if anyone called preventDefault on the\n   *     event object or if any of the listeners returned false.\n   * @api\n   */\n  dispatchEvent(event) {\n    const evt = typeof event === 'string' ? new Event(event) : event;\n    const type = evt.type;\n    evt.target = this;\n    const listeners = this.listeners_[type];\n    let propagate;\n    if (listeners) {\n      if (!(type in this.dispatching_)) {\n        this.dispatching_[type] = 0;\n        this.pendingRemovals_[type] = 0;\n      }\n      ++this.dispatching_[type];\n      for (let i = 0, ii = listeners.length; i < ii; ++i) {\n        if (listeners[i].call(this, evt) === false || evt.propagationStopped) {\n          propagate = false;\n          break;\n        }\n      }\n      --this.dispatching_[type];\n      if (this.dispatching_[type] === 0) {\n        let pendingRemovals = this.pendingRemovals_[type];\n        delete this.pendingRemovals_[type];\n        while (pendingRemovals--) {\n          this.removeEventListener(type, VOID);\n        }\n        delete this.dispatching_[type];\n      }\n      return propagate;\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    unlistenAll(this);\n  }\n\n  /**\n   * Get the listeners for a specified event type. Listeners are returned in the\n   * order that they will be called in.\n   *\n   * @param {string} type Type.\n   * @return {Array<import(\"../events.js\").ListenerFunction>} Listeners.\n   */\n  getListeners(type) {\n    return this.listeners_[type];\n  }\n\n  /**\n   * @param {string=} opt_type Type. If not provided,\n   *     `true` will be returned if this event target has any listeners.\n   * @return {boolean} Has listeners.\n   */\n  hasListener(opt_type) {\n    return opt_type ?\n      opt_type in this.listeners_ :\n      Object.keys(this.listeners_).length > 0;\n  }\n\n  /**\n   * @param {string} type Type.\n   * @param {import(\"../events.js\").ListenerFunction} listener Listener.\n   */\n  removeEventListener(type, listener) {\n    const listeners = this.listeners_[type];\n    if (listeners) {\n      const index = listeners.indexOf(listener);\n      if (type in this.pendingRemovals_) {\n        // make listener a no-op, and remove later in #dispatchEvent()\n        listeners[index] = VOID;\n        ++this.pendingRemovals_[type];\n      } else {\n        listeners.splice(index, 1);\n        if (listeners.length === 0) {\n          delete this.listeners_[type];\n        }\n      }\n    }\n  }\n}\n\n\nexport default Target;\n","/**\n * @module ol/events/EventType\n */\n\n/**\n * @enum {string}\n * @const\n */\nexport default {\n  /**\n   * Generic change event. Triggered when the revision counter is increased.\n   * @event module:ol/events/Event~Event#change\n   * @api\n   */\n  CHANGE: 'change',\n\n  CLEAR: 'clear',\n  CONTEXTMENU: 'contextmenu',\n  CLICK: 'click',\n  DBLCLICK: 'dblclick',\n  DRAGENTER: 'dragenter',\n  DRAGOVER: 'dragover',\n  DROP: 'drop',\n  ERROR: 'error',\n  KEYDOWN: 'keydown',\n  KEYPRESS: 'keypress',\n  LOAD: 'load',\n  MOUSEDOWN: 'mousedown',\n  MOUSEMOVE: 'mousemove',\n  MOUSEOUT: 'mouseout',\n  MOUSEUP: 'mouseup',\n  MOUSEWHEEL: 'mousewheel',\n  MSPOINTERDOWN: 'MSPointerDown',\n  RESIZE: 'resize',\n  TOUCHSTART: 'touchstart',\n  TOUCHMOVE: 'touchmove',\n  TOUCHEND: 'touchend',\n  WHEEL: 'wheel'\n};\n","/**\n * @module ol/Observable\n */\nimport {listen, unlistenByKey, unlisten, listenOnce} from './events.js';\nimport EventTarget from './events/Target.js';\nimport EventType from './events/EventType.js';\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * An event target providing convenient methods for listener registration\n * and unregistration. A generic `change` event is always available through\n * {@link module:ol/Observable~Observable#changed}.\n *\n * @fires import(\"./events/Event.js\").Event\n * @api\n */\nclass Observable extends EventTarget {\n  constructor() {\n\n    super();\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.revision_ = 0;\n\n  }\n\n  /**\n   * Increases the revision counter and dispatches a 'change' event.\n   * @api\n   */\n  changed() {\n    ++this.revision_;\n    this.dispatchEvent(EventType.CHANGE);\n  }\n\n  /**\n   * Get the version number for this object.  Each time the object is modified,\n   * its version number will be incremented.\n   * @return {number} Revision.\n   * @api\n   */\n  getRevision() {\n    return this.revision_;\n  }\n\n  /**\n   * Listen for a certain type of event.\n   * @param {string|Array<string>} type The event type or array of event types.\n   * @param {function(?): ?} listener The listener function.\n   * @return {import(\"./events.js\").EventsKey|Array<import(\"./events.js\").EventsKey>} Unique key for the listener. If\n   *     called with an array of event types as the first argument, the return\n   *     will be an array of keys.\n   * @api\n   */\n  on(type, listener) {\n    if (Array.isArray(type)) {\n      const len = type.length;\n      const keys = new Array(len);\n      for (let i = 0; i < len; ++i) {\n        keys[i] = listen(this, type[i], listener);\n      }\n      return keys;\n    } else {\n      return listen(this, /** @type {string} */ (type), listener);\n    }\n  }\n\n  /**\n   * Listen once for a certain type of event.\n   * @param {string|Array<string>} type The event type or array of event types.\n   * @param {function(?): ?} listener The listener function.\n   * @return {import(\"./events.js\").EventsKey|Array<import(\"./events.js\").EventsKey>} Unique key for the listener. If\n   *     called with an array of event types as the first argument, the return\n   *     will be an array of keys.\n   * @api\n   */\n  once(type, listener) {\n    if (Array.isArray(type)) {\n      const len = type.length;\n      const keys = new Array(len);\n      for (let i = 0; i < len; ++i) {\n        keys[i] = listenOnce(this, type[i], listener);\n      }\n      return keys;\n    } else {\n      return listenOnce(this, /** @type {string} */ (type), listener);\n    }\n  }\n\n  /**\n   * Unlisten for a certain type of event.\n   * @param {string|Array<string>} type The event type or array of event types.\n   * @param {function(?): ?} listener The listener function.\n   * @api\n   */\n  un(type, listener) {\n    if (Array.isArray(type)) {\n      for (let i = 0, ii = type.length; i < ii; ++i) {\n        unlisten(this, type[i], listener);\n      }\n      return;\n    } else {\n      unlisten(this, /** @type {string} */ (type), listener);\n    }\n  }\n}\n\n\n/**\n * Removes an event listener using the key returned by `on()` or `once()`.\n * @param {import(\"./events.js\").EventsKey|Array<import(\"./events.js\").EventsKey>} key The key returned by `on()`\n *     or `once()` (or an array of keys).\n * @api\n */\nexport function unByKey(key) {\n  if (Array.isArray(key)) {\n    for (let i = 0, ii = key.length; i < ii; ++i) {\n      unlistenByKey(key[i]);\n    }\n  } else {\n    unlistenByKey(/** @type {import(\"./events.js\").EventsKey} */ (key));\n  }\n}\n\n\nexport default Observable;\n","/**\n * @module ol/Object\n */\nimport {getUid} from './util.js';\nimport ObjectEventType from './ObjectEventType.js';\nimport Observable from './Observable.js';\nimport Event from './events/Event.js';\nimport {assign} from './obj.js';\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/Object~BaseObject} instances are instances of this type.\n */\nexport class ObjectEvent extends Event {\n\n  /**\n   * @param {string} type The event type.\n   * @param {string} key The property name.\n   * @param {*} oldValue The old value for `key`.\n   */\n  constructor(type, key, oldValue) {\n    super(type);\n\n    /**\n     * The name of the property whose value is changing.\n     * @type {string}\n     * @api\n     */\n    this.key = key;\n\n    /**\n     * The old value. To get the new value use `e.target.get(e.key)` where\n     * `e` is the event object.\n     * @type {*}\n     * @api\n     */\n    this.oldValue = oldValue;\n\n  }\n\n}\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Most non-trivial classes inherit from this.\n *\n * This extends {@link module:ol/Observable} with observable\n * properties, where each property is observable as well as the object as a\n * whole.\n *\n * Classes that inherit from this have pre-defined properties, to which you can\n * add your owns. The pre-defined properties are listed in this documentation as\n * 'Observable Properties', and have their own accessors; for example,\n * {@link module:ol/Map~Map} has a `target` property, accessed with\n * `getTarget()` and changed with `setTarget()`. Not all properties are however\n * settable. There are also general-purpose accessors `get()` and `set()`. For\n * example, `get('target')` is equivalent to `getTarget()`.\n *\n * The `set` accessors trigger a change event, and you can monitor this by\n * registering a listener. For example, {@link module:ol/View~View} has a\n * `center` property, so `view.on('change:center', function(evt) {...});` would\n * call the function whenever the value of the center property changes. Within\n * the function, `evt.target` would be the view, so `evt.target.getCenter()`\n * would return the new center.\n *\n * You can add your own observable properties with\n * `object.set('prop', 'value')`, and retrieve that with `object.get('prop')`.\n * You can listen for changes on that property value with\n * `object.on('change:prop', listener)`. You can get a list of all\n * properties with {@link module:ol/Object~BaseObject#getProperties}.\n *\n * Note that the observable properties are separate from standard JS properties.\n * You can, for example, give your map object a title with\n * `map.title='New title'` and with `map.set('title', 'Another title')`. The\n * first will be a `hasOwnProperty`; the second will appear in\n * `getProperties()`. Only the second is observable.\n *\n * Properties can be deleted by using the unset method. E.g.\n * object.unset('foo').\n *\n * @fires ObjectEvent\n * @api\n */\nclass BaseObject extends Observable {\n\n  /**\n   * @param {Object<string, *>=} opt_values An object with key-value pairs.\n   */\n  constructor(opt_values) {\n    super();\n\n    // Call {@link module:ol/util~getUid} to ensure that the order of objects' ids is\n    // the same as the order in which they were created.  This also helps to\n    // ensure that object properties are always added in the same order, which\n    // helps many JavaScript engines generate faster code.\n    getUid(this);\n\n    /**\n     * @private\n     * @type {!Object<string, *>}\n     */\n    this.values_ = {};\n\n    if (opt_values !== undefined) {\n      this.setProperties(opt_values);\n    }\n  }\n\n  /**\n   * Gets a value.\n   * @param {string} key Key name.\n   * @return {*} Value.\n   * @api\n   */\n  get(key) {\n    let value;\n    if (this.values_.hasOwnProperty(key)) {\n      value = this.values_[key];\n    }\n    return value;\n  }\n\n  /**\n   * Get a list of object property names.\n   * @return {Array<string>} List of property names.\n   * @api\n   */\n  getKeys() {\n    return Object.keys(this.values_);\n  }\n\n  /**\n   * Get an object of all property names and values.\n   * @return {Object<string, *>} Object.\n   * @api\n   */\n  getProperties() {\n    return assign({}, this.values_);\n  }\n\n  /**\n   * @param {string} key Key name.\n   * @param {*} oldValue Old value.\n   */\n  notify(key, oldValue) {\n    let eventType;\n    eventType = getChangeEventType(key);\n    this.dispatchEvent(new ObjectEvent(eventType, key, oldValue));\n    eventType = ObjectEventType.PROPERTYCHANGE;\n    this.dispatchEvent(new ObjectEvent(eventType, key, oldValue));\n  }\n\n  /**\n   * Sets a value.\n   * @param {string} key Key name.\n   * @param {*} value Value.\n   * @param {boolean=} opt_silent Update without triggering an event.\n   * @api\n   */\n  set(key, value, opt_silent) {\n    if (opt_silent) {\n      this.values_[key] = value;\n    } else {\n      const oldValue = this.values_[key];\n      this.values_[key] = value;\n      if (oldValue !== value) {\n        this.notify(key, oldValue);\n      }\n    }\n  }\n\n  /**\n   * Sets a collection of key-value pairs.  Note that this changes any existing\n   * properties and adds new ones (it does not remove any existing properties).\n   * @param {Object<string, *>} values Values.\n   * @param {boolean=} opt_silent Update without triggering an event.\n   * @api\n   */\n  setProperties(values, opt_silent) {\n    for (const key in values) {\n      this.set(key, values[key], opt_silent);\n    }\n  }\n\n  /**\n   * Unsets a property.\n   * @param {string} key Key name.\n   * @param {boolean=} opt_silent Unset without triggering an event.\n   * @api\n   */\n  unset(key, opt_silent) {\n    if (key in this.values_) {\n      const oldValue = this.values_[key];\n      delete this.values_[key];\n      if (!opt_silent) {\n        this.notify(key, oldValue);\n      }\n    }\n  }\n}\n\n\n/**\n * @type {Object<string, string>}\n */\nconst changeEventTypeCache = {};\n\n\n/**\n * @param {string} key Key name.\n * @return {string} Change name.\n */\nexport function getChangeEventType(key) {\n  return changeEventTypeCache.hasOwnProperty(key) ?\n    changeEventTypeCache[key] :\n    (changeEventTypeCache[key] = 'change:' + key);\n}\n\n\nexport default BaseObject;\n","/**\n * @module ol/Collection\n */\nimport AssertionError from './AssertionError.js';\nimport CollectionEventType from './CollectionEventType.js';\nimport BaseObject from './Object.js';\nimport Event from './events/Event.js';\n\n\n/**\n * @enum {string}\n * @private\n */\nconst Property = {\n  LENGTH: 'length'\n};\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/Collection~Collection} instances are instances of this\n * type.\n */\nexport class CollectionEvent extends Event {\n\n  /**\n   * @param {CollectionEventType} type Type.\n   * @param {*=} opt_element Element.\n   */\n  constructor(type, opt_element) {\n    super(type);\n\n    /**\n     * The element that is added to or removed from the collection.\n     * @type {*}\n     * @api\n     */\n    this.element = opt_element;\n\n  }\n\n}\n\n\n/**\n * @typedef {Object} Options\n * @property {boolean} [unique=false] Disallow the same item from being added to\n * the collection twice.\n */\n\n/**\n * @classdesc\n * An expanded version of standard JS Array, adding convenience methods for\n * manipulation. Add and remove changes to the Collection trigger a Collection\n * event. Note that this does not cover changes to the objects _within_ the\n * Collection; they trigger events on the appropriate object, not on the\n * Collection as a whole.\n *\n * @fires CollectionEvent\n *\n * @template T\n * @api\n */\nclass Collection extends BaseObject {\n\n  /**\n   * @param {Array<T>=} opt_array Array.\n   * @param {Options=} opt_options Collection options.\n   */\n  constructor(opt_array, opt_options) {\n\n    super();\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.unique_ = !!options.unique;\n\n    /**\n     * @private\n     * @type {!Array<T>}\n     */\n    this.array_ = opt_array ? opt_array : [];\n\n    if (this.unique_) {\n      for (let i = 0, ii = this.array_.length; i < ii; ++i) {\n        this.assertUnique_(this.array_[i], i);\n      }\n    }\n\n    this.updateLength_();\n\n  }\n\n  /**\n   * Remove all elements from the collection.\n   * @api\n   */\n  clear() {\n    while (this.getLength() > 0) {\n      this.pop();\n    }\n  }\n\n  /**\n   * Add elements to the collection.  This pushes each item in the provided array\n   * to the end of the collection.\n   * @param {!Array<T>} arr Array.\n   * @return {Collection<T>} This collection.\n   * @api\n   */\n  extend(arr) {\n    for (let i = 0, ii = arr.length; i < ii; ++i) {\n      this.push(arr[i]);\n    }\n    return this;\n  }\n\n  /**\n   * Iterate over each element, calling the provided callback.\n   * @param {function(T, number, Array<T>): *} f The function to call\n   *     for every element. This function takes 3 arguments (the element, the\n   *     index and the array). The return value is ignored.\n   * @api\n   */\n  forEach(f) {\n    const array = this.array_;\n    for (let i = 0, ii = array.length; i < ii; ++i) {\n      f(array[i], i, array);\n    }\n  }\n\n  /**\n   * Get a reference to the underlying Array object. Warning: if the array\n   * is mutated, no events will be dispatched by the collection, and the\n   * collection's \"length\" property won't be in sync with the actual length\n   * of the array.\n   * @return {!Array<T>} Array.\n   * @api\n   */\n  getArray() {\n    return this.array_;\n  }\n\n  /**\n   * Get the element at the provided index.\n   * @param {number} index Index.\n   * @return {T} Element.\n   * @api\n   */\n  item(index) {\n    return this.array_[index];\n  }\n\n  /**\n   * Get the length of this collection.\n   * @return {number} The length of the array.\n   * @observable\n   * @api\n   */\n  getLength() {\n    return this.get(Property.LENGTH);\n  }\n\n  /**\n   * Insert an element at the provided index.\n   * @param {number} index Index.\n   * @param {T} elem Element.\n   * @api\n   */\n  insertAt(index, elem) {\n    if (this.unique_) {\n      this.assertUnique_(elem);\n    }\n    this.array_.splice(index, 0, elem);\n    this.updateLength_();\n    this.dispatchEvent(\n      new CollectionEvent(CollectionEventType.ADD, elem));\n  }\n\n  /**\n   * Remove the last element of the collection and return it.\n   * Return `undefined` if the collection is empty.\n   * @return {T|undefined} Element.\n   * @api\n   */\n  pop() {\n    return this.removeAt(this.getLength() - 1);\n  }\n\n  /**\n   * Insert the provided element at the end of the collection.\n   * @param {T} elem Element.\n   * @return {number} New length of the collection.\n   * @api\n   */\n  push(elem) {\n    if (this.unique_) {\n      this.assertUnique_(elem);\n    }\n    const n = this.getLength();\n    this.insertAt(n, elem);\n    return this.getLength();\n  }\n\n  /**\n   * Remove the first occurrence of an element from the collection.\n   * @param {T} elem Element.\n   * @return {T|undefined} The removed element or undefined if none found.\n   * @api\n   */\n  remove(elem) {\n    const arr = this.array_;\n    for (let i = 0, ii = arr.length; i < ii; ++i) {\n      if (arr[i] === elem) {\n        return this.removeAt(i);\n      }\n    }\n    return undefined;\n  }\n\n  /**\n   * Remove the element at the provided index and return it.\n   * Return `undefined` if the collection does not contain this index.\n   * @param {number} index Index.\n   * @return {T|undefined} Value.\n   * @api\n   */\n  removeAt(index) {\n    const prev = this.array_[index];\n    this.array_.splice(index, 1);\n    this.updateLength_();\n    this.dispatchEvent(new CollectionEvent(CollectionEventType.REMOVE, prev));\n    return prev;\n  }\n\n  /**\n   * Set the element at the provided index.\n   * @param {number} index Index.\n   * @param {T} elem Element.\n   * @api\n   */\n  setAt(index, elem) {\n    const n = this.getLength();\n    if (index < n) {\n      if (this.unique_) {\n        this.assertUnique_(elem, index);\n      }\n      const prev = this.array_[index];\n      this.array_[index] = elem;\n      this.dispatchEvent(\n        new CollectionEvent(CollectionEventType.REMOVE, prev));\n      this.dispatchEvent(\n        new CollectionEvent(CollectionEventType.ADD, elem));\n    } else {\n      for (let j = n; j < index; ++j) {\n        this.insertAt(j, undefined);\n      }\n      this.insertAt(index, elem);\n    }\n  }\n\n  /**\n   * @private\n   */\n  updateLength_() {\n    this.set(Property.LENGTH, this.array_.length);\n  }\n\n  /**\n   * @private\n   * @param {T} elem Element.\n   * @param {number=} opt_except Optional index to ignore.\n   */\n  assertUnique_(elem, opt_except) {\n    for (let i = 0, ii = this.array_.length; i < ii; ++i) {\n      if (this.array_[i] === elem && i !== opt_except) {\n        throw new AssertionError(58);\n      }\n    }\n  }\n}\n\n\nexport default Collection;\n","/**\n * @module ol/MapEvent\n */\nimport Event from './events/Event.js';\n\n/**\n * @classdesc\n * Events emitted as map events are instances of this type.\n * See {@link module:ol/PluggableMap~PluggableMap} for which events trigger a map event.\n */\nclass MapEvent extends Event {\n\n  /**\n   * @param {string} type Event type.\n   * @param {import(\"./PluggableMap.js\").default} map Map.\n   * @param {?import(\"./PluggableMap.js\").FrameState=} opt_frameState Frame state.\n   */\n  constructor(type, map, opt_frameState) {\n\n    super(type);\n\n    /**\n     * The map where the event occurred.\n     * @type {import(\"./PluggableMap.js\").default}\n     * @api\n     */\n    this.map = map;\n\n    /**\n     * The frame state at the time of the event.\n     * @type {?import(\"./PluggableMap.js\").FrameState}\n     * @api\n     */\n    this.frameState = opt_frameState !== undefined ? opt_frameState : null;\n\n  }\n\n}\n\nexport default MapEvent;\n","/**\n * @module ol/MapBrowserEvent\n */\nimport MapEvent from './MapEvent.js';\n\n/**\n * @classdesc\n * Events emitted as map browser events are instances of this type.\n * See {@link module:ol/PluggableMap~PluggableMap} for which events trigger a map browser event.\n */\nclass MapBrowserEvent extends MapEvent {\n\n  /**\n   * @param {string} type Event type.\n   * @param {import(\"./PluggableMap.js\").default} map Map.\n   * @param {Event} browserEvent Browser event.\n   * @param {boolean=} opt_dragging Is the map currently being dragged?\n   * @param {?import(\"./PluggableMap.js\").FrameState=} opt_frameState Frame state.\n   */\n  constructor(type, map, browserEvent, opt_dragging, opt_frameState) {\n\n    super(type, map, opt_frameState);\n\n    /**\n     * The original browser event.\n     * @const\n     * @type {Event}\n     * @api\n     */\n    this.originalEvent = browserEvent;\n\n    /**\n     * The map pixel relative to the viewport corresponding to the original browser event.\n     * @type {import(\"./pixel.js\").Pixel}\n     * @api\n     */\n    this.pixel = map.getEventPixel(browserEvent);\n\n    /**\n     * The coordinate in view projection corresponding to the original browser event.\n     * @type {import(\"./coordinate.js\").Coordinate}\n     * @api\n     */\n    this.coordinate = map.getCoordinateFromPixel(this.pixel);\n\n    /**\n     * Indicates if the map is currently being dragged. Only set for\n     * `POINTERDRAG` and `POINTERMOVE` events. Default is `false`.\n     *\n     * @type {boolean}\n     * @api\n     */\n    this.dragging = opt_dragging !== undefined ? opt_dragging : false;\n\n  }\n\n  /**\n   * Prevents the default browser action.\n   * See https://developer.mozilla.org/en-US/docs/Web/API/event.preventDefault.\n   * @override\n   * @api\n   */\n  preventDefault() {\n    super.preventDefault();\n    this.originalEvent.preventDefault();\n  }\n\n  /**\n   * Prevents further propagation of the current event.\n   * See https://developer.mozilla.org/en-US/docs/Web/API/event.stopPropagation.\n   * @override\n   * @api\n   */\n  stopPropagation() {\n    super.stopPropagation();\n    this.originalEvent.stopPropagation();\n  }\n}\n\n\nexport default MapBrowserEvent;\n","/**\n * @module ol/webgl\n */\n\n\n/**\n * Constants taken from goog.webgl\n */\n\n\n/**\n * @const\n * @type {number}\n */\nexport const ONE = 1;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const SRC_ALPHA = 0x0302;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const COLOR_ATTACHMENT0 = 0x8CE0;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const COLOR_BUFFER_BIT = 0x00004000;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const TRIANGLES = 0x0004;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const TRIANGLE_STRIP = 0x0005;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const ONE_MINUS_SRC_ALPHA = 0x0303;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const ARRAY_BUFFER = 0x8892;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const ELEMENT_ARRAY_BUFFER = 0x8893;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const STREAM_DRAW = 0x88E0;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const STATIC_DRAW = 0x88E4;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const DYNAMIC_DRAW = 0x88E8;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const CULL_FACE = 0x0B44;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const BLEND = 0x0BE2;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const STENCIL_TEST = 0x0B90;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const DEPTH_TEST = 0x0B71;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const SCISSOR_TEST = 0x0C11;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const UNSIGNED_BYTE = 0x1401;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const UNSIGNED_SHORT = 0x1403;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const UNSIGNED_INT = 0x1405;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const FLOAT = 0x1406;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const RGBA = 0x1908;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const FRAGMENT_SHADER = 0x8B30;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const VERTEX_SHADER = 0x8B31;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const LINK_STATUS = 0x8B82;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const LINEAR = 0x2601;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const TEXTURE_MAG_FILTER = 0x2800;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const TEXTURE_MIN_FILTER = 0x2801;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const TEXTURE_WRAP_S = 0x2802;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const TEXTURE_WRAP_T = 0x2803;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const TEXTURE_2D = 0x0DE1;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const TEXTURE0 = 0x84C0;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const CLAMP_TO_EDGE = 0x812F;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const COMPILE_STATUS = 0x8B81;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const FRAMEBUFFER = 0x8D40;\n\n\n/** end of goog.webgl constants\n */\n\n\n/**\n * @const\n * @type {Array<string>}\n */\nconst CONTEXT_IDS = [\n  'experimental-webgl',\n  'webgl',\n  'webkit-3d',\n  'moz-webgl'\n];\n\n\n/**\n * @param {HTMLCanvasElement} canvas Canvas.\n * @param {Object=} opt_attributes Attributes.\n * @return {WebGLRenderingContext} WebGL rendering context.\n */\nexport function getContext(canvas, opt_attributes) {\n  const ii = CONTEXT_IDS.length;\n  for (let i = 0; i < ii; ++i) {\n    try {\n      const context = canvas.getContext(CONTEXT_IDS[i], opt_attributes);\n      if (context) {\n        return /** @type {!WebGLRenderingContext} */ (context);\n      }\n    } catch (e) {\n      // pass\n    }\n  }\n  return null;\n}\n\n\n/**\n * Include debuggable shader sources.  Default is `true`. This should be set to\n * `false` for production builds.\n * @type {boolean}\n */\nexport const DEBUG = true;\n\n\n/**\n * The maximum supported WebGL texture size in pixels. If WebGL is not\n * supported, the value is set to `undefined`.\n * @type {number|undefined}\n */\nlet MAX_TEXTURE_SIZE; // value is set below\n\n\n/**\n * List of supported WebGL extensions.\n * @type {Array<string>}\n */\nlet EXTENSIONS; // value is set below\n\n\n/**\n * True if both OpenLayers and browser support WebGL.\n * @type {boolean}\n * @api\n */\nlet HAS = false;\n\n//TODO Remove side effects\nif (typeof window !== 'undefined' && 'WebGLRenderingContext' in window) {\n  try {\n    const canvas = /** @type {HTMLCanvasElement} */ (document.createElement('canvas'));\n    const gl = getContext(canvas, {failIfMajorPerformanceCaveat: true});\n    if (gl) {\n      HAS = true;\n      MAX_TEXTURE_SIZE = /** @type {number} */ (gl.getParameter(gl.MAX_TEXTURE_SIZE));\n      EXTENSIONS = gl.getSupportedExtensions();\n    }\n  } catch (e) {\n    // pass\n  }\n}\n\nexport {HAS, MAX_TEXTURE_SIZE, EXTENSIONS};\n","/**\n * @module ol/has\n */\n\nconst ua = typeof navigator !== 'undefined' ?\n  navigator.userAgent.toLowerCase() : '';\n\n/**\n * User agent string says we are dealing with Firefox as browser.\n * @type {boolean}\n */\nexport const FIREFOX = ua.indexOf('firefox') !== -1;\n\n/**\n * User agent string says we are dealing with Safari as browser.\n * @type {boolean}\n */\nexport const SAFARI = ua.indexOf('safari') !== -1 && ua.indexOf('chrom') == -1;\n\n/**\n * User agent string says we are dealing with a WebKit engine.\n * @type {boolean}\n */\nexport const WEBKIT = ua.indexOf('webkit') !== -1 && ua.indexOf('edge') == -1;\n\n/**\n * User agent string says we are dealing with a Mac as platform.\n * @type {boolean}\n */\nexport const MAC = ua.indexOf('macintosh') !== -1;\n\n\n/**\n * The ratio between physical pixels and device-independent pixels\n * (dips) on the device (`window.devicePixelRatio`).\n * @const\n * @type {number}\n * @api\n */\nexport const DEVICE_PIXEL_RATIO = window.devicePixelRatio || 1;\n\n\n/**\n * True if the browser's Canvas implementation implements {get,set}LineDash.\n * @type {boolean}\n */\nexport const CANVAS_LINE_DASH = function() {\n  let has = false;\n  try {\n    has = !!document.createElement('canvas').getContext('2d').setLineDash;\n  } catch (e) {\n    // pass\n  }\n  return has;\n}();\n\n\n/**\n * Is HTML5 geolocation supported in the current browser?\n * @const\n * @type {boolean}\n * @api\n */\nexport const GEOLOCATION = 'geolocation' in navigator;\n\n\n/**\n * True if browser supports touch events.\n * @const\n * @type {boolean}\n * @api\n */\nexport const TOUCH = 'ontouchstart' in window;\n\n\n/**\n * True if browser supports pointer events.\n * @const\n * @type {boolean}\n */\nexport const POINTER = 'PointerEvent' in window;\n\n\n/**\n * True if browser supports ms pointer events (IE 10).\n * @const\n * @type {boolean}\n */\nexport const MSPOINTER = !!(navigator.msPointerEnabled);\n\n\nexport {HAS as WEBGL} from './webgl.js';\n","/**\n * @module ol/MapBrowserEventType\n */\nimport EventType from './events/EventType.js';\n\n/**\n * Constants for event names.\n * @enum {string}\n */\nexport default {\n\n  /**\n   * A true single click with no dragging and no double click. Note that this\n   * event is delayed by 250 ms to ensure that it is not a double click.\n   * @event module:ol/MapBrowserEvent~MapBrowserEvent#singleclick\n   * @api\n   */\n  SINGLECLICK: 'singleclick',\n\n  /**\n   * A click with no dragging. A double click will fire two of this.\n   * @event module:ol/MapBrowserEvent~MapBrowserEvent#click\n   * @api\n   */\n  CLICK: EventType.CLICK,\n\n  /**\n   * A true double click, with no dragging.\n   * @event module:ol/MapBrowserEvent~MapBrowserEvent#dblclick\n   * @api\n   */\n  DBLCLICK: EventType.DBLCLICK,\n\n  /**\n   * Triggered when a pointer is dragged.\n   * @event module:ol/MapBrowserEvent~MapBrowserEvent#pointerdrag\n   * @api\n   */\n  POINTERDRAG: 'pointerdrag',\n\n  /**\n   * Triggered when a pointer is moved. Note that on touch devices this is\n   * triggered when the map is panned, so is not the same as mousemove.\n   * @event module:ol/MapBrowserEvent~MapBrowserEvent#pointermove\n   * @api\n   */\n  POINTERMOVE: 'pointermove',\n\n  POINTERDOWN: 'pointerdown',\n  POINTERUP: 'pointerup',\n  POINTEROVER: 'pointerover',\n  POINTEROUT: 'pointerout',\n  POINTERENTER: 'pointerenter',\n  POINTERLEAVE: 'pointerleave',\n  POINTERCANCEL: 'pointercancel'\n};\n","/**\n * @module ol/MapBrowserPointerEvent\n */\nimport MapBrowserEvent from './MapBrowserEvent.js';\n\nclass MapBrowserPointerEvent extends MapBrowserEvent {\n\n  /**\n   * @param {string} type Event type.\n   * @param {import(\"./PluggableMap.js\").default} map Map.\n   * @param {import(\"./pointer/PointerEvent.js\").default} pointerEvent Pointer event.\n   * @param {boolean=} opt_dragging Is the map currently being dragged?\n   * @param {?import(\"./PluggableMap.js\").FrameState=} opt_frameState Frame state.\n   */\n  constructor(type, map, pointerEvent, opt_dragging, opt_frameState) {\n\n    super(type, map, pointerEvent.originalEvent, opt_dragging, opt_frameState);\n\n    /**\n     * @const\n     * @type {import(\"./pointer/PointerEvent.js\").default}\n     */\n    this.pointerEvent = pointerEvent;\n\n  }\n\n}\n\nexport default MapBrowserPointerEvent;\n","/**\n * @module ol/pointer/EventType\n */\n\n/**\n * Constants for event names.\n * @enum {string}\n */\nexport default {\n  POINTERMOVE: 'pointermove',\n  POINTERDOWN: 'pointerdown',\n  POINTERUP: 'pointerup',\n  POINTEROVER: 'pointerover',\n  POINTEROUT: 'pointerout',\n  POINTERENTER: 'pointerenter',\n  POINTERLEAVE: 'pointerleave',\n  POINTERCANCEL: 'pointercancel'\n};\n","/**\n * @module ol/pointer/EventSource\n */\n\nclass EventSource {\n\n  /**\n   * @param {import(\"./PointerEventHandler.js\").default} dispatcher Event handler.\n   * @param {!Object<string, function(Event)>} mapping Event mapping.\n   */\n  constructor(dispatcher, mapping) {\n\n    /**\n     * @type {import(\"./PointerEventHandler.js\").default}\n     */\n    this.dispatcher = dispatcher;\n\n    /**\n     * @private\n     * @const\n     * @type {!Object<string, function(Event)>}\n     */\n    this.mapping_ = mapping;\n  }\n\n  /**\n   * List of events supported by this source.\n   * @return {Array<string>} Event names\n   */\n  getEvents() {\n    return Object.keys(this.mapping_);\n  }\n\n  /**\n   * Returns the handler that should handle a given event type.\n   * @param {string} eventType The event type.\n   * @return {function(Event)} Handler\n   */\n  getHandlerForEvent(eventType) {\n    return this.mapping_[eventType];\n  }\n\n}\n\nexport default EventSource;\n","/**\n * @module ol/pointer/MouseSource\n */\n\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport EventSource from './EventSource.js';\n\n\n/**\n * @type {number}\n */\nexport const POINTER_ID = 1;\n\n\n/**\n * @type {string}\n */\nexport const POINTER_TYPE = 'mouse';\n\n\n/**\n * Radius around touchend that swallows mouse events.\n *\n * @type {number}\n */\nconst DEDUP_DIST = 25;\n\n/**\n * Handler for `mousedown`.\n *\n * @this {MouseSource}\n * @param {MouseEvent} inEvent The in event.\n */\nfunction mousedown(inEvent) {\n  if (!this.isEventSimulatedFromTouch_(inEvent)) {\n    // TODO(dfreedman) workaround for some elements not sending mouseup\n    // http://crbug/149091\n    if (POINTER_ID.toString() in this.pointerMap) {\n      this.cancel(inEvent);\n    }\n    const e = prepareEvent(inEvent, this.dispatcher);\n    this.pointerMap[POINTER_ID.toString()] = inEvent;\n    this.dispatcher.down(e, inEvent);\n  }\n}\n\n/**\n * Handler for `mousemove`.\n *\n * @this {MouseSource}\n * @param {MouseEvent} inEvent The in event.\n */\nfunction mousemove(inEvent) {\n  if (!this.isEventSimulatedFromTouch_(inEvent)) {\n    const e = prepareEvent(inEvent, this.dispatcher);\n    this.dispatcher.move(e, inEvent);\n  }\n}\n\n/**\n * Handler for `mouseup`.\n *\n * @this {MouseSource}\n * @param {MouseEvent} inEvent The in event.\n */\nfunction mouseup(inEvent) {\n  if (!this.isEventSimulatedFromTouch_(inEvent)) {\n    const p = this.pointerMap[POINTER_ID.toString()];\n\n    if (p && p.button === inEvent.button) {\n      const e = prepareEvent(inEvent, this.dispatcher);\n      this.dispatcher.up(e, inEvent);\n      this.cleanupMouse();\n    }\n  }\n}\n\n/**\n * Handler for `mouseover`.\n *\n * @this {MouseSource}\n * @param {MouseEvent} inEvent The in event.\n */\nfunction mouseover(inEvent) {\n  if (!this.isEventSimulatedFromTouch_(inEvent)) {\n    const e = prepareEvent(inEvent, this.dispatcher);\n    this.dispatcher.enterOver(e, inEvent);\n  }\n}\n\n/**\n * Handler for `mouseout`.\n *\n * @this {MouseSource}\n * @param {MouseEvent} inEvent The in event.\n */\nfunction mouseout(inEvent) {\n  if (!this.isEventSimulatedFromTouch_(inEvent)) {\n    const e = prepareEvent(inEvent, this.dispatcher);\n    this.dispatcher.leaveOut(e, inEvent);\n  }\n}\n\n\nclass MouseSource extends EventSource {\n\n  /**\n   * @param {import(\"./PointerEventHandler.js\").default} dispatcher Event handler.\n   */\n  constructor(dispatcher) {\n    const mapping = {\n      'mousedown': mousedown,\n      'mousemove': mousemove,\n      'mouseup': mouseup,\n      'mouseover': mouseover,\n      'mouseout': mouseout\n    };\n    super(dispatcher, mapping);\n\n    /**\n     * @const\n     * @type {!Object<string, Event|Object>}\n     */\n    this.pointerMap = dispatcher.pointerMap;\n\n    /**\n     * @const\n     * @type {Array<import(\"../pixel.js\").Pixel>}\n     */\n    this.lastTouches = [];\n  }\n\n  /**\n   * Detect if a mouse event was simulated from a touch by\n   * checking if previously there was a touch event at the\n   * same position.\n   *\n   * FIXME - Known problem with the native Android browser on\n   * Samsung GT-I9100 (Android 4.1.2):\n   * In case the page is scrolled, this function does not work\n   * correctly when a canvas is used (WebGL or canvas renderer).\n   * Mouse listeners on canvas elements (for this browser), create\n   * two mouse events: One 'good' and one 'bad' one (on other browsers or\n   * when a div is used, there is only one event). For the 'bad' one,\n   * clientX/clientY and also pageX/pageY are wrong when the page\n   * is scrolled. Because of that, this function can not detect if\n   * the events were simulated from a touch event. As result, a\n   * pointer event at a wrong position is dispatched, which confuses\n   * the map interactions.\n   * It is unclear, how one can get the correct position for the event\n   * or detect that the positions are invalid.\n   *\n   * @private\n   * @param {MouseEvent} inEvent The in event.\n   * @return {boolean} True, if the event was generated by a touch.\n   */\n  isEventSimulatedFromTouch_(inEvent) {\n    const lts = this.lastTouches;\n    const x = inEvent.clientX;\n    const y = inEvent.clientY;\n    for (let i = 0, l = lts.length, t; i < l && (t = lts[i]); i++) {\n      // simulated mouse events will be swallowed near a primary touchend\n      const dx = Math.abs(x - t[0]);\n      const dy = Math.abs(y - t[1]);\n      if (dx <= DEDUP_DIST && dy <= DEDUP_DIST) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * Dispatches a `pointercancel` event.\n   *\n   * @param {Event} inEvent The in event.\n   */\n  cancel(inEvent) {\n    const e = prepareEvent(inEvent, this.dispatcher);\n    this.dispatcher.cancel(e, inEvent);\n    this.cleanupMouse();\n  }\n\n  /**\n   * Remove the mouse from the list of active pointers.\n   */\n  cleanupMouse() {\n    delete this.pointerMap[POINTER_ID.toString()];\n  }\n}\n\n\n/**\n * Creates a copy of the original event that will be used\n * for the fake pointer event.\n *\n * @param {Event} inEvent The in event.\n * @param {import(\"./PointerEventHandler.js\").default} dispatcher Event handler.\n * @return {Object} The copied event.\n */\nexport function prepareEvent(inEvent, dispatcher) {\n  const e = dispatcher.cloneEvent(inEvent, inEvent);\n\n  // forward mouse preventDefault\n  const pd = e.preventDefault;\n  e.preventDefault = function() {\n    inEvent.preventDefault();\n    pd();\n  };\n\n  e.pointerId = POINTER_ID;\n  e.isPrimary = true;\n  e.pointerType = POINTER_TYPE;\n\n  return e;\n}\n\n\nexport default MouseSource;\n","/**\n * @module ol/pointer/MsSource\n */\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport EventSource from './EventSource.js';\n\n\n/**\n * @const\n * @type {Array<string>}\n */\nconst POINTER_TYPES = [\n  '',\n  'unavailable',\n  'touch',\n  'pen',\n  'mouse'\n];\n\n/**\n * Handler for `msPointerDown`.\n *\n * @this {MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerDown(inEvent) {\n  this.pointerMap[inEvent.pointerId.toString()] = inEvent;\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.down(e, inEvent);\n}\n\n/**\n * Handler for `msPointerMove`.\n *\n * @this {MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerMove(inEvent) {\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.move(e, inEvent);\n}\n\n/**\n * Handler for `msPointerUp`.\n *\n * @this {MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerUp(inEvent) {\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.up(e, inEvent);\n  this.cleanup(inEvent.pointerId);\n}\n\n/**\n * Handler for `msPointerOut`.\n *\n * @this {MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerOut(inEvent) {\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.leaveOut(e, inEvent);\n}\n\n/**\n * Handler for `msPointerOver`.\n *\n * @this {MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerOver(inEvent) {\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.enterOver(e, inEvent);\n}\n\n/**\n * Handler for `msPointerCancel`.\n *\n * @this {MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msPointerCancel(inEvent) {\n  const e = this.prepareEvent_(inEvent);\n  this.dispatcher.cancel(e, inEvent);\n  this.cleanup(inEvent.pointerId);\n}\n\n/**\n * Handler for `msLostPointerCapture`.\n *\n * @this {MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msLostPointerCapture(inEvent) {\n  const e = this.dispatcher.makeEvent('lostpointercapture', inEvent, inEvent);\n  this.dispatcher.dispatchEvent(e);\n}\n\n/**\n * Handler for `msGotPointerCapture`.\n *\n * @this {MsSource}\n * @param {MSPointerEvent} inEvent The in event.\n */\nfunction msGotPointerCapture(inEvent) {\n  const e = this.dispatcher.makeEvent('gotpointercapture', inEvent, inEvent);\n  this.dispatcher.dispatchEvent(e);\n}\n\nclass MsSource extends EventSource {\n\n  /**\n   * @param {import(\"./PointerEventHandler.js\").default} dispatcher Event handler.\n   */\n  constructor(dispatcher) {\n    const mapping = {\n      'MSPointerDown': msPointerDown,\n      'MSPointerMove': msPointerMove,\n      'MSPointerUp': msPointerUp,\n      'MSPointerOut': msPointerOut,\n      'MSPointerOver': msPointerOver,\n      'MSPointerCancel': msPointerCancel,\n      'MSGotPointerCapture': msGotPointerCapture,\n      'MSLostPointerCapture': msLostPointerCapture\n    };\n    super(dispatcher, mapping);\n\n    /**\n     * @const\n     * @type {!Object<string, MSPointerEvent|Object>}\n     */\n    this.pointerMap = dispatcher.pointerMap;\n  }\n\n  /**\n   * Creates a copy of the original event that will be used\n   * for the fake pointer event.\n   *\n   * @private\n   * @param {MSPointerEvent} inEvent The in event.\n   * @return {Object} The copied event.\n   */\n  prepareEvent_(inEvent) {\n    /** @type {MSPointerEvent|Object} */\n    let e = inEvent;\n    if (typeof inEvent.pointerType === 'number') {\n      e = this.dispatcher.cloneEvent(inEvent, inEvent);\n      e.pointerType = POINTER_TYPES[inEvent.pointerType];\n    }\n\n    return e;\n  }\n\n  /**\n   * Remove this pointer from the list of active pointers.\n   * @param {number} pointerId Pointer identifier.\n   */\n  cleanup(pointerId) {\n    delete this.pointerMap[pointerId.toString()];\n  }\n\n}\n\nexport default MsSource;\n","/**\n * @module ol/pointer/NativeSource\n */\n\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport EventSource from './EventSource.js';\n\n/**\n * Handler for `pointerdown`.\n *\n * @this {NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerDown(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `pointermove`.\n *\n * @this {NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerMove(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `pointerup`.\n *\n * @this {NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerUp(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `pointerout`.\n *\n * @this {NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerOut(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `pointerover`.\n *\n * @this {NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerOver(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `pointercancel`.\n *\n * @this {NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction pointerCancel(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `lostpointercapture`.\n *\n * @this {NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction lostPointerCapture(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\n/**\n * Handler for `gotpointercapture`.\n *\n * @this {NativeSource}\n * @param {Event} inEvent The in event.\n */\nfunction gotPointerCapture(inEvent) {\n  this.dispatcher.fireNativeEvent(inEvent);\n}\n\nclass NativeSource extends EventSource {\n\n  /**\n   * @param {import(\"./PointerEventHandler.js\").default} dispatcher Event handler.\n   */\n  constructor(dispatcher) {\n    const mapping = {\n      'pointerdown': pointerDown,\n      'pointermove': pointerMove,\n      'pointerup': pointerUp,\n      'pointerout': pointerOut,\n      'pointerover': pointerOver,\n      'pointercancel': pointerCancel,\n      'gotpointercapture': gotPointerCapture,\n      'lostpointercapture': lostPointerCapture\n    };\n    super(dispatcher, mapping);\n  }\n\n}\n\nexport default NativeSource;\n","/**\n * @module ol/pointer/PointerEvent\n */\n\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport _Event from '../events/Event.js';\n\n\n/**\n * Is the `buttons` property supported?\n * @type {boolean}\n */\nlet HAS_BUTTONS = false;\n\n\nclass PointerEvent extends _Event {\n\n  /**\n   * A class for pointer events.\n   *\n   * This class is used as an abstraction for mouse events,\n   * touch events and even native pointer events.\n   *\n   * @param {string} type The type of the event to create.\n   * @param {Event} originalEvent The event.\n   * @param {Object<string, ?>=} opt_eventDict An optional dictionary of\n   *    initial event properties.\n   */\n  constructor(type, originalEvent, opt_eventDict) {\n    super(type);\n\n    /**\n     * @const\n     * @type {Event}\n     */\n    this.originalEvent = originalEvent;\n\n    const eventDict = opt_eventDict ? opt_eventDict : {};\n\n    /**\n     * @type {number}\n     */\n    this.buttons = getButtons(eventDict);\n\n    /**\n     * @type {number}\n     */\n    this.pressure = getPressure(eventDict, this.buttons);\n\n    // MouseEvent related properties\n\n    /**\n     * @type {boolean}\n     */\n    this.bubbles = 'bubbles' in eventDict ? eventDict['bubbles'] : false;\n\n    /**\n     * @type {boolean}\n     */\n    this.cancelable = 'cancelable' in eventDict ? eventDict['cancelable'] : false;\n\n    /**\n     * @type {Object}\n     */\n    this.view = 'view' in eventDict ? eventDict['view'] : null;\n\n    /**\n     * @type {number}\n     */\n    this.detail = 'detail' in eventDict ? eventDict['detail'] : null;\n\n    /**\n     * @type {number}\n     */\n    this.screenX = 'screenX' in eventDict ? eventDict['screenX'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.screenY = 'screenY' in eventDict ? eventDict['screenY'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.clientX = 'clientX' in eventDict ? eventDict['clientX'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.clientY = 'clientY' in eventDict ? eventDict['clientY'] : 0;\n\n    /**\n     * @type {boolean}\n     */\n    this.ctrlKey = 'ctrlKey' in eventDict ? eventDict['ctrlKey'] : false;\n\n    /**\n     * @type {boolean}\n     */\n    this.altKey = 'altKey' in eventDict ? eventDict['altKey'] : false;\n\n    /**\n     * @type {boolean}\n     */\n    this.shiftKey = 'shiftKey' in eventDict ? eventDict['shiftKey'] : false;\n\n    /**\n     * @type {boolean}\n     */\n    this.metaKey = 'metaKey' in eventDict ? eventDict['metaKey'] : false;\n\n    /**\n     * @type {number}\n     */\n    this.button = 'button' in eventDict ? eventDict['button'] : 0;\n\n    /**\n     * @type {Node}\n     */\n    this.relatedTarget = 'relatedTarget' in eventDict ?\n      eventDict['relatedTarget'] : null;\n\n    // PointerEvent related properties\n\n    /**\n     * @const\n     * @type {number}\n     */\n    this.pointerId = 'pointerId' in eventDict ? eventDict['pointerId'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.width = 'width' in eventDict ? eventDict['width'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.height = 'height' in eventDict ? eventDict['height'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.tiltX = 'tiltX' in eventDict ? eventDict['tiltX'] : 0;\n\n    /**\n     * @type {number}\n     */\n    this.tiltY = 'tiltY' in eventDict ? eventDict['tiltY'] : 0;\n\n    /**\n     * @type {string}\n     */\n    this.pointerType = 'pointerType' in eventDict ? eventDict['pointerType'] : '';\n\n    /**\n     * @type {number}\n     */\n    this.hwTimestamp = 'hwTimestamp' in eventDict ? eventDict['hwTimestamp'] : 0;\n\n    /**\n     * @type {boolean}\n     */\n    this.isPrimary = 'isPrimary' in eventDict ? eventDict['isPrimary'] : false;\n\n    // keep the semantics of preventDefault\n    if (originalEvent.preventDefault) {\n      this.preventDefault = function() {\n        originalEvent.preventDefault();\n      };\n    }\n  }\n\n}\n\n\n/**\n * @param {Object<string, ?>} eventDict The event dictionary.\n * @return {number} Button indicator.\n */\nfunction getButtons(eventDict) {\n  // According to the w3c spec,\n  // http://www.w3.org/TR/DOM-Level-3-Events/#events-MouseEvent-button\n  // MouseEvent.button == 0 can mean either no mouse button depressed, or the\n  // left mouse button depressed.\n  //\n  // As of now, the only way to distinguish between the two states of\n  // MouseEvent.button is by using the deprecated MouseEvent.which property, as\n  // this maps mouse buttons to positive integers > 0, and uses 0 to mean that\n  // no mouse button is held.\n  //\n  // MouseEvent.which is derived from MouseEvent.button at MouseEvent creation,\n  // but initMouseEvent does not expose an argument with which to set\n  // MouseEvent.which. Calling initMouseEvent with a buttonArg of 0 will set\n  // MouseEvent.button == 0 and MouseEvent.which == 1, breaking the expectations\n  // of app developers.\n  //\n  // The only way to propagate the correct state of MouseEvent.which and\n  // MouseEvent.button to a new MouseEvent.button == 0 and MouseEvent.which == 0\n  // is to call initMouseEvent with a buttonArg value of -1.\n  //\n  // This is fixed with DOM Level 4's use of buttons\n  let buttons;\n  if (eventDict.buttons || HAS_BUTTONS) {\n    buttons = eventDict.buttons;\n  } else {\n    switch (eventDict.which) {\n      case 1: buttons = 1; break;\n      case 2: buttons = 4; break;\n      case 3: buttons = 2; break;\n      default: buttons = 0;\n    }\n  }\n  return buttons;\n}\n\n\n/**\n * @param {Object<string, ?>} eventDict The event dictionary.\n * @param {number} buttons Button indicator.\n * @return {number} The pressure.\n */\nfunction getPressure(eventDict, buttons) {\n  // Spec requires that pointers without pressure specified use 0.5 for down\n  // state and 0 for up state.\n  let pressure = 0;\n  if (eventDict.pressure) {\n    pressure = eventDict.pressure;\n  } else {\n    pressure = buttons ? 0.5 : 0;\n  }\n  return pressure;\n}\n\n\n/**\n * Checks if the `buttons` property is supported.\n */\n(function() {\n  try {\n    const ev = new MouseEvent('click', {buttons: 1});\n    HAS_BUTTONS = ev.buttons === 1;\n  } catch (e) {\n    // pass\n  }\n})();\n\nexport default PointerEvent;\n","/**\n * @module ol/array\n */\n\n\n/**\n * Performs a binary search on the provided sorted list and returns the index of the item if found. If it can't be found it'll return -1.\n * https://github.com/darkskyapp/binary-search\n *\n * @param {Array<*>} haystack Items to search through.\n * @param {*} needle The item to look for.\n * @param {Function=} opt_comparator Comparator function.\n * @return {number} The index of the item if found, -1 if not.\n */\nexport function binarySearch(haystack, needle, opt_comparator) {\n  let mid, cmp;\n  const comparator = opt_comparator || numberSafeCompareFunction;\n  let low = 0;\n  let high = haystack.length;\n  let found = false;\n\n  while (low < high) {\n    /* Note that \"(low + high) >>> 1\" may overflow, and results in a typecast\n     * to double (which gives the wrong results). */\n    mid = low + (high - low >> 1);\n    cmp = +comparator(haystack[mid], needle);\n\n    if (cmp < 0.0) { /* Too low. */\n      low = mid + 1;\n\n    } else { /* Key found or too high */\n      high = mid;\n      found = !cmp;\n    }\n  }\n\n  /* Key not found. */\n  return found ? low : ~low;\n}\n\n\n/**\n * Compare function for array sort that is safe for numbers.\n * @param {*} a The first object to be compared.\n * @param {*} b The second object to be compared.\n * @return {number} A negative number, zero, or a positive number as the first\n *     argument is less than, equal to, or greater than the second.\n */\nexport function numberSafeCompareFunction(a, b) {\n  return a > b ? 1 : a < b ? -1 : 0;\n}\n\n\n/**\n * Whether the array contains the given object.\n * @param {Array<*>} arr The array to test for the presence of the element.\n * @param {*} obj The object for which to test.\n * @return {boolean} The object is in the array.\n */\nexport function includes(arr, obj) {\n  return arr.indexOf(obj) >= 0;\n}\n\n\n/**\n * @param {Array<number>} arr Array.\n * @param {number} target Target.\n * @param {number} direction 0 means return the nearest, > 0\n *    means return the largest nearest, < 0 means return the\n *    smallest nearest.\n * @return {number} Index.\n */\nexport function linearFindNearest(arr, target, direction) {\n  const n = arr.length;\n  if (arr[0] <= target) {\n    return 0;\n  } else if (target <= arr[n - 1]) {\n    return n - 1;\n  } else {\n    let i;\n    if (direction > 0) {\n      for (i = 1; i < n; ++i) {\n        if (arr[i] < target) {\n          return i - 1;\n        }\n      }\n    } else if (direction < 0) {\n      for (i = 1; i < n; ++i) {\n        if (arr[i] <= target) {\n          return i;\n        }\n      }\n    } else {\n      for (i = 1; i < n; ++i) {\n        if (arr[i] == target) {\n          return i;\n        } else if (arr[i] < target) {\n          if (arr[i - 1] - target < target - arr[i]) {\n            return i - 1;\n          } else {\n            return i;\n          }\n        }\n      }\n    }\n    return n - 1;\n  }\n}\n\n\n/**\n * @param {Array<*>} arr Array.\n * @param {number} begin Begin index.\n * @param {number} end End index.\n */\nexport function reverseSubArray(arr, begin, end) {\n  while (begin < end) {\n    const tmp = arr[begin];\n    arr[begin] = arr[end];\n    arr[end] = tmp;\n    ++begin;\n    --end;\n  }\n}\n\n\n/**\n * @param {Array<VALUE>} arr The array to modify.\n * @param {!Array<VALUE>|VALUE} data The elements or arrays of elements to add to arr.\n * @template VALUE\n */\nexport function extend(arr, data) {\n  const extension = Array.isArray(data) ? data : [data];\n  const length = extension.length;\n  for (let i = 0; i < length; i++) {\n    arr[arr.length] = extension[i];\n  }\n}\n\n\n/**\n * @param {Array<VALUE>} arr The array to modify.\n * @param {VALUE} obj The element to remove.\n * @template VALUE\n * @return {boolean} If the element was removed.\n */\nexport function remove(arr, obj) {\n  const i = arr.indexOf(obj);\n  const found = i > -1;\n  if (found) {\n    arr.splice(i, 1);\n  }\n  return found;\n}\n\n\n/**\n * @param {Array<VALUE>} arr The array to search in.\n * @param {function(VALUE, number, ?) : boolean} func The function to compare.\n * @template VALUE\n * @return {VALUE|null} The element found or null.\n */\nexport function find(arr, func) {\n  const length = arr.length >>> 0;\n  let value;\n\n  for (let i = 0; i < length; i++) {\n    value = arr[i];\n    if (func(value, i, arr)) {\n      return value;\n    }\n  }\n  return null;\n}\n\n\n/**\n * @param {Array|Uint8ClampedArray} arr1 The first array to compare.\n * @param {Array|Uint8ClampedArray} arr2 The second array to compare.\n * @return {boolean} Whether the two arrays are equal.\n */\nexport function equals(arr1, arr2) {\n  const len1 = arr1.length;\n  if (len1 !== arr2.length) {\n    return false;\n  }\n  for (let i = 0; i < len1; i++) {\n    if (arr1[i] !== arr2[i]) {\n      return false;\n    }\n  }\n  return true;\n}\n\n\n/**\n * Sort the passed array such that the relative order of equal elements is preverved.\n * See https://en.wikipedia.org/wiki/Sorting_algorithm#Stability for details.\n * @param {Array<*>} arr The array to sort (modifies original).\n * @param {!function(*, *): number} compareFnc Comparison function.\n * @api\n */\nexport function stableSort(arr, compareFnc) {\n  const length = arr.length;\n  const tmp = Array(arr.length);\n  let i;\n  for (i = 0; i < length; i++) {\n    tmp[i] = {index: i, value: arr[i]};\n  }\n  tmp.sort(function(a, b) {\n    return compareFnc(a.value, b.value) || a.index - b.index;\n  });\n  for (i = 0; i < arr.length; i++) {\n    arr[i] = tmp[i].value;\n  }\n}\n\n\n/**\n * @param {Array<*>} arr The array to search in.\n * @param {Function} func Comparison function.\n * @return {number} Return index.\n */\nexport function findIndex(arr, func) {\n  let index;\n  const found = !arr.every(function(el, idx) {\n    index = idx;\n    return !func(el, idx, arr);\n  });\n  return found ? index : -1;\n}\n\n\n/**\n * @param {Array<*>} arr The array to test.\n * @param {Function=} opt_func Comparison function.\n * @param {boolean=} opt_strict Strictly sorted (default false).\n * @return {boolean} Return index.\n */\nexport function isSorted(arr, opt_func, opt_strict) {\n  const compare = opt_func || numberSafeCompareFunction;\n  return arr.every(function(currentVal, index) {\n    if (index === 0) {\n      return true;\n    }\n    const res = compare(arr[index - 1], currentVal);\n    return !(res > 0 || opt_strict && res === 0);\n  });\n}\n","/**\n * @module ol/pointer/TouchSource\n */\n\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport {remove} from '../array.js';\nimport EventSource from './EventSource.js';\nimport {POINTER_ID} from './MouseSource.js';\n\n\n/**\n * @type {number}\n */\nconst CLICK_COUNT_TIMEOUT = 200;\n\n/**\n * @type {string}\n */\nconst POINTER_TYPE = 'touch';\n\n/**\n * Handler for `touchstart`, triggers `pointerover`,\n * `pointerenter` and `pointerdown` events.\n *\n * @this {TouchSource}\n * @param {TouchEvent} inEvent The in event.\n */\nfunction touchstart(inEvent) {\n  this.vacuumTouches_(inEvent);\n  this.setPrimaryTouch_(inEvent.changedTouches[0]);\n  this.dedupSynthMouse_(inEvent);\n  this.clickCount_++;\n  this.processTouches_(inEvent, this.overDown_);\n}\n\n/**\n * Handler for `touchmove`.\n *\n * @this {TouchSource}\n * @param {TouchEvent} inEvent The in event.\n */\nfunction touchmove(inEvent) {\n  this.processTouches_(inEvent, this.moveOverOut_);\n}\n\n/**\n * Handler for `touchend`, triggers `pointerup`,\n * `pointerout` and `pointerleave` events.\n *\n * @this {TouchSource}\n * @param {TouchEvent} inEvent The event.\n */\nfunction touchend(inEvent) {\n  this.dedupSynthMouse_(inEvent);\n  this.processTouches_(inEvent, this.upOut_);\n}\n\n/**\n * Handler for `touchcancel`, triggers `pointercancel`,\n * `pointerout` and `pointerleave` events.\n *\n * @this {TouchSource}\n * @param {TouchEvent} inEvent The in event.\n */\nfunction touchcancel(inEvent) {\n  this.processTouches_(inEvent, this.cancelOut_);\n}\n\n\nclass TouchSource extends EventSource {\n\n  /**\n   * @param {import(\"./PointerEventHandler.js\").default} dispatcher The event handler.\n   * @param {import(\"./MouseSource.js\").default} mouseSource Mouse source.\n   */\n  constructor(dispatcher, mouseSource) {\n    const mapping = {\n      'touchstart': touchstart,\n      'touchmove': touchmove,\n      'touchend': touchend,\n      'touchcancel': touchcancel\n    };\n    super(dispatcher, mapping);\n\n    /**\n     * @const\n     * @type {!Object<string, Event|Object>}\n     */\n    this.pointerMap = dispatcher.pointerMap;\n\n    /**\n     * @const\n     * @type {import(\"./MouseSource.js\").default}\n     */\n    this.mouseSource = mouseSource;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.firstTouchId_ = undefined;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.clickCount_ = 0;\n\n    /**\n     * @private\n     * @type {?}\n     */\n    this.resetId_;\n\n    /**\n     * Mouse event timeout: This should be long enough to\n     * ignore compat mouse events made by touch.\n     * @private\n     * @type {number}\n     */\n    this.dedupTimeout_ = 2500;\n  }\n\n  /**\n   * @private\n   * @param {Touch} inTouch The in touch.\n   * @return {boolean} True, if this is the primary touch.\n   */\n  isPrimaryTouch_(inTouch) {\n    return this.firstTouchId_ === inTouch.identifier;\n  }\n\n  /**\n   * Set primary touch if there are no pointers, or the only pointer is the mouse.\n   * @param {Touch} inTouch The in touch.\n   * @private\n   */\n  setPrimaryTouch_(inTouch) {\n    const count = Object.keys(this.pointerMap).length;\n    if (count === 0 || (count === 1 && POINTER_ID.toString() in this.pointerMap)) {\n      this.firstTouchId_ = inTouch.identifier;\n      this.cancelResetClickCount_();\n    }\n  }\n\n  /**\n   * @private\n   * @param {PointerEvent} inPointer The in pointer object.\n   */\n  removePrimaryPointer_(inPointer) {\n    if (inPointer.isPrimary) {\n      this.firstTouchId_ = undefined;\n      this.resetClickCount_();\n    }\n  }\n\n  /**\n   * @private\n   */\n  resetClickCount_() {\n    this.resetId_ = setTimeout(\n      this.resetClickCountHandler_.bind(this),\n      CLICK_COUNT_TIMEOUT);\n  }\n\n  /**\n   * @private\n   */\n  resetClickCountHandler_() {\n    this.clickCount_ = 0;\n    this.resetId_ = undefined;\n  }\n\n  /**\n   * @private\n   */\n  cancelResetClickCount_() {\n    if (this.resetId_ !== undefined) {\n      clearTimeout(this.resetId_);\n    }\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} browserEvent Browser event\n   * @param {Touch} inTouch Touch event\n   * @return {PointerEvent} A pointer object.\n   */\n  touchToPointer_(browserEvent, inTouch) {\n    const e = this.dispatcher.cloneEvent(browserEvent, inTouch);\n    // Spec specifies that pointerId 1 is reserved for Mouse.\n    // Touch identifiers can start at 0.\n    // Add 2 to the touch identifier for compatibility.\n    e.pointerId = inTouch.identifier + 2;\n    // TODO: check if this is necessary?\n    //e.target = findTarget(e);\n    e.bubbles = true;\n    e.cancelable = true;\n    e.detail = this.clickCount_;\n    e.button = 0;\n    e.buttons = 1;\n    e.width = inTouch.radiusX || 0;\n    e.height = inTouch.radiusY || 0;\n    e.pressure = inTouch.force || 0.5;\n    e.isPrimary = this.isPrimaryTouch_(inTouch);\n    e.pointerType = POINTER_TYPE;\n\n    // make sure that the properties that are different for\n    // each `Touch` object are not copied from the BrowserEvent object\n    e.clientX = inTouch.clientX;\n    e.clientY = inTouch.clientY;\n    e.screenX = inTouch.screenX;\n    e.screenY = inTouch.screenY;\n\n    return e;\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} inEvent Touch event\n   * @param {function(TouchEvent, PointerEvent)} inFunction In function.\n   */\n  processTouches_(inEvent, inFunction) {\n    const touches = Array.prototype.slice.call(inEvent.changedTouches);\n    const count = touches.length;\n    function preventDefault() {\n      inEvent.preventDefault();\n    }\n    for (let i = 0; i < count; ++i) {\n      const pointer = this.touchToPointer_(inEvent, touches[i]);\n      // forward touch preventDefaults\n      pointer.preventDefault = preventDefault;\n      inFunction.call(this, inEvent, pointer);\n    }\n  }\n\n  /**\n   * @private\n   * @param {TouchList} touchList The touch list.\n   * @param {number} searchId Search identifier.\n   * @return {boolean} True, if the `Touch` with the given id is in the list.\n   */\n  findTouch_(touchList, searchId) {\n    const l = touchList.length;\n    for (let i = 0; i < l; i++) {\n      const touch = touchList[i];\n      if (touch.identifier === searchId) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * In some instances, a touchstart can happen without a touchend. This\n   * leaves the pointermap in a broken state.\n   * Therefore, on every touchstart, we remove the touches that did not fire a\n   * touchend event.\n   * To keep state globally consistent, we fire a pointercancel for\n   * this \"abandoned\" touch\n   *\n   * @private\n   * @param {TouchEvent} inEvent The in event.\n   */\n  vacuumTouches_(inEvent) {\n    const touchList = inEvent.touches;\n    // pointerMap.getCount() should be < touchList.length here,\n    // as the touchstart has not been processed yet.\n    const keys = Object.keys(this.pointerMap);\n    const count = keys.length;\n    if (count >= touchList.length) {\n      const d = [];\n      for (let i = 0; i < count; ++i) {\n        const key = Number(keys[i]);\n        const value = this.pointerMap[key];\n        // Never remove pointerId == 1, which is mouse.\n        // Touch identifiers are 2 smaller than their pointerId, which is the\n        // index in pointermap.\n        if (key != POINTER_ID && !this.findTouch_(touchList, key - 2)) {\n          d.push(value.out);\n        }\n      }\n      for (let i = 0; i < d.length; ++i) {\n        this.cancelOut_(inEvent, d[i]);\n      }\n    }\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} browserEvent The event.\n   * @param {PointerEvent} inPointer The in pointer object.\n   */\n  overDown_(browserEvent, inPointer) {\n    this.pointerMap[inPointer.pointerId] = {\n      target: inPointer.target,\n      out: inPointer,\n      outTarget: inPointer.target\n    };\n    this.dispatcher.over(inPointer, browserEvent);\n    this.dispatcher.enter(inPointer, browserEvent);\n    this.dispatcher.down(inPointer, browserEvent);\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} browserEvent The event.\n   * @param {PointerEvent} inPointer The in pointer.\n   */\n  moveOverOut_(browserEvent, inPointer) {\n    const event = inPointer;\n    const pointer = this.pointerMap[event.pointerId];\n    // a finger drifted off the screen, ignore it\n    if (!pointer) {\n      return;\n    }\n    const outEvent = pointer.out;\n    const outTarget = pointer.outTarget;\n    this.dispatcher.move(event, browserEvent);\n    if (outEvent && outTarget !== event.target) {\n      outEvent.relatedTarget = event.target;\n      /** @type {Object} */ (event).relatedTarget = outTarget;\n      // recover from retargeting by shadow\n      outEvent.target = outTarget;\n      if (event.target) {\n        this.dispatcher.leaveOut(outEvent, browserEvent);\n        this.dispatcher.enterOver(event, browserEvent);\n      } else {\n        // clean up case when finger leaves the screen\n        /** @type {Object} */ (event).target = outTarget;\n        /** @type {Object} */ (event).relatedTarget = null;\n        this.cancelOut_(browserEvent, event);\n      }\n    }\n    pointer.out = event;\n    pointer.outTarget = event.target;\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} browserEvent An event.\n   * @param {PointerEvent} inPointer The inPointer object.\n   */\n  upOut_(browserEvent, inPointer) {\n    this.dispatcher.up(inPointer, browserEvent);\n    this.dispatcher.out(inPointer, browserEvent);\n    this.dispatcher.leave(inPointer, browserEvent);\n    this.cleanUpPointer_(inPointer);\n  }\n\n  /**\n   * @private\n   * @param {TouchEvent} browserEvent The event.\n   * @param {PointerEvent} inPointer The in pointer.\n   */\n  cancelOut_(browserEvent, inPointer) {\n    this.dispatcher.cancel(inPointer, browserEvent);\n    this.dispatcher.out(inPointer, browserEvent);\n    this.dispatcher.leave(inPointer, browserEvent);\n    this.cleanUpPointer_(inPointer);\n  }\n\n  /**\n   * @private\n   * @param {PointerEvent} inPointer The inPointer object.\n   */\n  cleanUpPointer_(inPointer) {\n    delete this.pointerMap[inPointer.pointerId];\n    this.removePrimaryPointer_(inPointer);\n  }\n\n  /**\n   * Prevent synth mouse events from creating pointer events.\n   *\n   * @private\n   * @param {TouchEvent} inEvent The in event.\n   */\n  dedupSynthMouse_(inEvent) {\n    const lts = this.mouseSource.lastTouches;\n    const t = inEvent.changedTouches[0];\n    // only the primary finger will synth mouse events\n    if (this.isPrimaryTouch_(t)) {\n      // remember x/y of last touch\n      const lt = [t.clientX, t.clientY];\n      lts.push(lt);\n\n      setTimeout(function() {\n        // remove touch after timeout\n        remove(lts, lt);\n      }, this.dedupTimeout_);\n    }\n  }\n}\n\nexport default TouchSource;\n","/**\n * @module ol/pointer/PointerEventHandler\n */\n\n// Based on https://github.com/Polymer/PointerEvents\n\n// Copyright (c) 2013 The Polymer Authors. All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are\n// met:\n//\n// * Redistributions of source code must retain the above copyright\n// notice, this list of conditions and the following disclaimer.\n// * Redistributions in binary form must reproduce the above\n// copyright notice, this list of conditions and the following disclaimer\n// in the documentation and/or other materials provided with the\n// distribution.\n// * Neither the name of Google Inc. nor the names of its\n// contributors may be used to endorse or promote products derived from\n// this software without specific prior written permission.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS\n// \"AS IS\" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT\n// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR\n// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT\n// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,\n// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT\n// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,\n// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY\n// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT\n// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE\n// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.\n\nimport {listen, unlisten} from '../events.js';\nimport EventTarget from '../events/Target.js';\nimport {POINTER, MSPOINTER, TOUCH} from '../has.js';\nimport PointerEventType from './EventType.js';\nimport MouseSource, {prepareEvent as prepareMouseEvent} from './MouseSource.js';\nimport MsSource from './MsSource.js';\nimport NativeSource from './NativeSource.js';\nimport PointerEvent from './PointerEvent.js';\nimport TouchSource from './TouchSource.js';\n\n\n/**\n * Properties to copy when cloning an event, with default values.\n * @type {Array<Array>}\n */\nconst CLONE_PROPS = [\n  // MouseEvent\n  ['bubbles', false],\n  ['cancelable', false],\n  ['view', null],\n  ['detail', null],\n  ['screenX', 0],\n  ['screenY', 0],\n  ['clientX', 0],\n  ['clientY', 0],\n  ['ctrlKey', false],\n  ['altKey', false],\n  ['shiftKey', false],\n  ['metaKey', false],\n  ['button', 0],\n  ['relatedTarget', null],\n  // DOM Level 3\n  ['buttons', 0],\n  // PointerEvent\n  ['pointerId', 0],\n  ['width', 0],\n  ['height', 0],\n  ['pressure', 0],\n  ['tiltX', 0],\n  ['tiltY', 0],\n  ['pointerType', ''],\n  ['hwTimestamp', 0],\n  ['isPrimary', false],\n  // event instance\n  ['type', ''],\n  ['target', null],\n  ['currentTarget', null],\n  ['which', 0]\n];\n\n\nclass PointerEventHandler extends EventTarget {\n\n  /**\n   * @param {Element|HTMLDocument} element Viewport element.\n   */\n  constructor(element) {\n    super();\n\n    /**\n     * @const\n     * @private\n     * @type {Element|HTMLDocument}\n     */\n    this.element_ = element;\n\n    /**\n     * @const\n     * @type {!Object<string, Event|Object>}\n     */\n    this.pointerMap = {};\n\n    /**\n     * @type {Object<string, function(Event)>}\n     * @private\n     */\n    this.eventMap_ = {};\n\n    /**\n     * @type {Array<import(\"./EventSource.js\").default>}\n     * @private\n     */\n    this.eventSourceList_ = [];\n\n    this.registerSources();\n  }\n\n  /**\n   * Set up the event sources (mouse, touch and native pointers)\n   * that generate pointer events.\n   */\n  registerSources() {\n    if (POINTER) {\n      this.registerSource('native', new NativeSource(this));\n    } else if (MSPOINTER) {\n      this.registerSource('ms', new MsSource(this));\n    } else {\n      const mouseSource = new MouseSource(this);\n      this.registerSource('mouse', mouseSource);\n\n      if (TOUCH) {\n        this.registerSource('touch', new TouchSource(this, mouseSource));\n      }\n    }\n\n    // register events on the viewport element\n    this.register_();\n  }\n\n  /**\n   * Add a new event source that will generate pointer events.\n   *\n   * @param {string} name A name for the event source\n   * @param {import(\"./EventSource.js\").default} source The source event.\n   */\n  registerSource(name, source) {\n    const s = source;\n    const newEvents = s.getEvents();\n\n    if (newEvents) {\n      newEvents.forEach(function(e) {\n        const handler = s.getHandlerForEvent(e);\n\n        if (handler) {\n          this.eventMap_[e] = handler.bind(s);\n        }\n      }.bind(this));\n      this.eventSourceList_.push(s);\n    }\n  }\n\n  /**\n   * Set up the events for all registered event sources.\n   * @private\n   */\n  register_() {\n    const l = this.eventSourceList_.length;\n    for (let i = 0; i < l; i++) {\n      const eventSource = this.eventSourceList_[i];\n      this.addEvents_(eventSource.getEvents());\n    }\n  }\n\n  /**\n   * Remove all registered events.\n   * @private\n   */\n  unregister_() {\n    const l = this.eventSourceList_.length;\n    for (let i = 0; i < l; i++) {\n      const eventSource = this.eventSourceList_[i];\n      this.removeEvents_(eventSource.getEvents());\n    }\n  }\n\n  /**\n   * Calls the right handler for a new event.\n   * @private\n   * @param {Event} inEvent Browser event.\n   */\n  eventHandler_(inEvent) {\n    const type = inEvent.type;\n    const handler = this.eventMap_[type];\n    if (handler) {\n      handler(inEvent);\n    }\n  }\n\n  /**\n   * Setup listeners for the given events.\n   * @private\n   * @param {Array<string>} events List of events.\n   */\n  addEvents_(events) {\n    events.forEach(function(eventName) {\n      listen(this.element_, eventName, this.eventHandler_, this);\n    }.bind(this));\n  }\n\n  /**\n   * Unregister listeners for the given events.\n   * @private\n   * @param {Array<string>} events List of events.\n   */\n  removeEvents_(events) {\n    events.forEach(function(e) {\n      unlisten(this.element_, e, this.eventHandler_, this);\n    }.bind(this));\n  }\n\n  /**\n   * Returns a snapshot of inEvent, with writable properties.\n   *\n   * @param {Event} event Browser event.\n   * @param {Event|Touch} inEvent An event that contains\n   *    properties to copy.\n   * @return {Object} An object containing shallow copies of\n   *    `inEvent`'s properties.\n   */\n  cloneEvent(event, inEvent) {\n    const eventCopy = {};\n    for (let i = 0, ii = CLONE_PROPS.length; i < ii; i++) {\n      const p = CLONE_PROPS[i][0];\n      eventCopy[p] = event[p] || inEvent[p] || CLONE_PROPS[i][1];\n    }\n\n    return eventCopy;\n  }\n\n  // EVENTS\n\n\n  /**\n   * Triggers a 'pointerdown' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  down(data, event) {\n    this.fireEvent(PointerEventType.POINTERDOWN, data, event);\n  }\n\n  /**\n   * Triggers a 'pointermove' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  move(data, event) {\n    this.fireEvent(PointerEventType.POINTERMOVE, data, event);\n  }\n\n  /**\n   * Triggers a 'pointerup' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  up(data, event) {\n    this.fireEvent(PointerEventType.POINTERUP, data, event);\n  }\n\n  /**\n   * Triggers a 'pointerenter' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  enter(data, event) {\n    data.bubbles = false;\n    this.fireEvent(PointerEventType.POINTERENTER, data, event);\n  }\n\n  /**\n   * Triggers a 'pointerleave' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  leave(data, event) {\n    data.bubbles = false;\n    this.fireEvent(PointerEventType.POINTERLEAVE, data, event);\n  }\n\n  /**\n   * Triggers a 'pointerover' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  over(data, event) {\n    data.bubbles = true;\n    this.fireEvent(PointerEventType.POINTEROVER, data, event);\n  }\n\n  /**\n   * Triggers a 'pointerout' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  out(data, event) {\n    data.bubbles = true;\n    this.fireEvent(PointerEventType.POINTEROUT, data, event);\n  }\n\n  /**\n   * Triggers a 'pointercancel' event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  cancel(data, event) {\n    this.fireEvent(PointerEventType.POINTERCANCEL, data, event);\n  }\n\n  /**\n   * Triggers a combination of 'pointerout' and 'pointerleave' events.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  leaveOut(data, event) {\n    this.out(data, event);\n    if (!this.contains_(data.target, data.relatedTarget)) {\n      this.leave(data, event);\n    }\n  }\n\n  /**\n   * Triggers a combination of 'pointerover' and 'pointerevents' events.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  enterOver(data, event) {\n    this.over(data, event);\n    if (!this.contains_(data.target, data.relatedTarget)) {\n      this.enter(data, event);\n    }\n  }\n\n  /**\n   * @private\n   * @param {Element} container The container element.\n   * @param {Element} contained The contained element.\n   * @return {boolean} Returns true if the container element\n   *   contains the other element.\n   */\n  contains_(container, contained) {\n    if (!container || !contained) {\n      return false;\n    }\n    return container.contains(contained);\n  }\n\n  // EVENT CREATION AND TRACKING\n  /**\n   * Creates a new Event of type `inType`, based on the information in\n   * `data`.\n   *\n   * @param {string} inType A string representing the type of event to create.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   * @return {PointerEvent} A PointerEvent of type `inType`.\n   */\n  makeEvent(inType, data, event) {\n    return new PointerEvent(inType, event, data);\n  }\n\n  /**\n   * Make and dispatch an event in one call.\n   * @param {string} inType A string representing the type of event.\n   * @param {Object} data Pointer event data.\n   * @param {Event} event The event.\n   */\n  fireEvent(inType, data, event) {\n    const e = this.makeEvent(inType, data, event);\n    this.dispatchEvent(e);\n  }\n\n  /**\n   * Creates a pointer event from a native pointer event\n   * and dispatches this event.\n   * @param {Event} event A platform event with a target.\n   */\n  fireNativeEvent(event) {\n    const e = this.makeEvent(event.type, event, event);\n    this.dispatchEvent(e);\n  }\n\n  /**\n   * Wrap a native mouse event into a pointer event.\n   * This proxy method is required for the legacy IE support.\n   * @param {string} eventType The pointer event type.\n   * @param {Event} event The event.\n   * @return {PointerEvent} The wrapped event.\n   */\n  wrapMouseEvent(eventType, event) {\n    const pointerEvent = this.makeEvent(\n      eventType, prepareMouseEvent(event, this), event);\n    return pointerEvent;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    this.unregister_();\n    super.disposeInternal();\n  }\n}\n\nexport default PointerEventHandler;\n","/**\n * @module ol/MapBrowserEventHandler\n */\nimport {DEVICE_PIXEL_RATIO} from './has.js';\nimport MapBrowserEventType from './MapBrowserEventType.js';\nimport MapBrowserPointerEvent from './MapBrowserPointerEvent.js';\nimport {listen, unlistenByKey} from './events.js';\nimport EventTarget from './events/Target.js';\nimport PointerEventType from './pointer/EventType.js';\nimport PointerEventHandler from './pointer/PointerEventHandler.js';\n\nclass MapBrowserEventHandler extends EventTarget {\n\n  /**\n   * @param {import(\"./PluggableMap.js\").default} map The map with the viewport to listen to events on.\n   * @param {number=} moveTolerance The minimal distance the pointer must travel to trigger a move.\n   */\n  constructor(map, moveTolerance) {\n\n    super();\n\n    /**\n     * This is the element that we will listen to the real events on.\n     * @type {import(\"./PluggableMap.js\").default}\n     * @private\n     */\n    this.map_ = map;\n\n    /**\n     * @type {any}\n     * @private\n     */\n    this.clickTimeoutId_;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.dragging_ = false;\n\n    /**\n     * @type {!Array<import(\"./events.js\").EventsKey>}\n     * @private\n     */\n    this.dragListenerKeys_ = [];\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.moveTolerance_ = moveTolerance ?\n      moveTolerance * DEVICE_PIXEL_RATIO : DEVICE_PIXEL_RATIO;\n\n    /**\n     * The most recent \"down\" type event (or null if none have occurred).\n     * Set on pointerdown.\n     * @type {import(\"./pointer/PointerEvent.js\").default}\n     * @private\n     */\n    this.down_ = null;\n\n    const element = this.map_.getViewport();\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.activePointers_ = 0;\n\n    /**\n     * @type {!Object<number, boolean>}\n     * @private\n     */\n    this.trackedTouches_ = {};\n\n    /**\n     * Event handler which generates pointer events for\n     * the viewport element.\n     *\n     * @type {PointerEventHandler}\n     * @private\n     */\n    this.pointerEventHandler_ = new PointerEventHandler(element);\n\n    /**\n     * Event handler which generates pointer events for\n     * the document (used when dragging).\n     *\n     * @type {PointerEventHandler}\n     * @private\n     */\n    this.documentPointerEventHandler_ = null;\n\n    /**\n     * @type {?import(\"./events.js\").EventsKey}\n     * @private\n     */\n    this.pointerdownListenerKey_ = listen(this.pointerEventHandler_,\n      PointerEventType.POINTERDOWN,\n      this.handlePointerDown_, this);\n\n    /**\n     * @type {?import(\"./events.js\").EventsKey}\n     * @private\n     */\n    this.relayedListenerKey_ = listen(this.pointerEventHandler_,\n      PointerEventType.POINTERMOVE,\n      this.relayEvent_, this);\n\n  }\n\n  /**\n   * @param {import(\"./pointer/PointerEvent.js\").default} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  emulateClick_(pointerEvent) {\n    let newEvent = new MapBrowserPointerEvent(\n      MapBrowserEventType.CLICK, this.map_, pointerEvent);\n    this.dispatchEvent(newEvent);\n    if (this.clickTimeoutId_ !== undefined) {\n      // double-click\n      clearTimeout(this.clickTimeoutId_);\n      this.clickTimeoutId_ = undefined;\n      newEvent = new MapBrowserPointerEvent(\n        MapBrowserEventType.DBLCLICK, this.map_, pointerEvent);\n      this.dispatchEvent(newEvent);\n    } else {\n      // click\n      this.clickTimeoutId_ = setTimeout(function() {\n        this.clickTimeoutId_ = undefined;\n        const newEvent = new MapBrowserPointerEvent(\n          MapBrowserEventType.SINGLECLICK, this.map_, pointerEvent);\n        this.dispatchEvent(newEvent);\n      }.bind(this), 250);\n    }\n  }\n\n  /**\n   * Keeps track on how many pointers are currently active.\n   *\n   * @param {import(\"./pointer/PointerEvent.js\").default} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  updateActivePointers_(pointerEvent) {\n    const event = pointerEvent;\n\n    if (event.type == MapBrowserEventType.POINTERUP ||\n        event.type == MapBrowserEventType.POINTERCANCEL) {\n      delete this.trackedTouches_[event.pointerId];\n    } else if (event.type == MapBrowserEventType.POINTERDOWN) {\n      this.trackedTouches_[event.pointerId] = true;\n    }\n    this.activePointers_ = Object.keys(this.trackedTouches_).length;\n  }\n\n  /**\n   * @param {import(\"./pointer/PointerEvent.js\").default} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  handlePointerUp_(pointerEvent) {\n    this.updateActivePointers_(pointerEvent);\n    const newEvent = new MapBrowserPointerEvent(\n      MapBrowserEventType.POINTERUP, this.map_, pointerEvent);\n    this.dispatchEvent(newEvent);\n\n    // We emulate click events on left mouse button click, touch contact, and pen\n    // contact. isMouseActionButton returns true in these cases (evt.button is set\n    // to 0).\n    // See http://www.w3.org/TR/pointerevents/#button-states\n    // We only fire click, singleclick, and doubleclick if nobody has called\n    // event.stopPropagation() or event.preventDefault().\n    if (!newEvent.propagationStopped && !this.dragging_ && this.isMouseActionButton_(pointerEvent)) {\n      this.emulateClick_(this.down_);\n    }\n\n    if (this.activePointers_ === 0) {\n      this.dragListenerKeys_.forEach(unlistenByKey);\n      this.dragListenerKeys_.length = 0;\n      this.dragging_ = false;\n      this.down_ = null;\n      this.documentPointerEventHandler_.dispose();\n      this.documentPointerEventHandler_ = null;\n    }\n  }\n\n  /**\n   * @param {import(\"./pointer/PointerEvent.js\").default} pointerEvent Pointer\n   * event.\n   * @return {boolean} If the left mouse button was pressed.\n   * @private\n   */\n  isMouseActionButton_(pointerEvent) {\n    return pointerEvent.button === 0;\n  }\n\n  /**\n   * @param {import(\"./pointer/PointerEvent.js\").default} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  handlePointerDown_(pointerEvent) {\n    this.updateActivePointers_(pointerEvent);\n    const newEvent = new MapBrowserPointerEvent(\n      MapBrowserEventType.POINTERDOWN, this.map_, pointerEvent);\n    this.dispatchEvent(newEvent);\n\n    this.down_ = pointerEvent;\n\n    if (this.dragListenerKeys_.length === 0) {\n      /* Set up a pointer event handler on the `document`,\n       * which is required when the pointer is moved outside\n       * the viewport when dragging.\n       */\n      this.documentPointerEventHandler_ =\n          new PointerEventHandler(document);\n\n      this.dragListenerKeys_.push(\n        listen(this.documentPointerEventHandler_,\n          MapBrowserEventType.POINTERMOVE,\n          this.handlePointerMove_, this),\n        listen(this.documentPointerEventHandler_,\n          MapBrowserEventType.POINTERUP,\n          this.handlePointerUp_, this),\n        /* Note that the listener for `pointercancel is set up on\n         * `pointerEventHandler_` and not `documentPointerEventHandler_` like\n         * the `pointerup` and `pointermove` listeners.\n         *\n         * The reason for this is the following: `TouchSource.vacuumTouches_()`\n         * issues `pointercancel` events, when there was no `touchend` for a\n         * `touchstart`. Now, let's say a first `touchstart` is registered on\n         * `pointerEventHandler_`. The `documentPointerEventHandler_` is set up.\n         * But `documentPointerEventHandler_` doesn't know about the first\n         * `touchstart`. If there is no `touchend` for the `touchstart`, we can\n         * only receive a `touchcancel` from `pointerEventHandler_`, because it is\n         * only registered there.\n         */\n        listen(this.pointerEventHandler_,\n          MapBrowserEventType.POINTERCANCEL,\n          this.handlePointerUp_, this)\n      );\n    }\n  }\n\n  /**\n   * @param {import(\"./pointer/PointerEvent.js\").default} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  handlePointerMove_(pointerEvent) {\n    // Between pointerdown and pointerup, pointermove events are triggered.\n    // To avoid a 'false' touchmove event to be dispatched, we test if the pointer\n    // moved a significant distance.\n    if (this.isMoving_(pointerEvent)) {\n      this.dragging_ = true;\n      const newEvent = new MapBrowserPointerEvent(\n        MapBrowserEventType.POINTERDRAG, this.map_, pointerEvent,\n        this.dragging_);\n      this.dispatchEvent(newEvent);\n    }\n\n    // Some native android browser triggers mousemove events during small period\n    // of time. See: https://code.google.com/p/android/issues/detail?id=5491 or\n    // https://code.google.com/p/android/issues/detail?id=19827\n    // ex: Galaxy Tab P3110 + Android 4.1.1\n    pointerEvent.preventDefault();\n  }\n\n  /**\n   * Wrap and relay a pointer event.  Note that this requires that the type\n   * string for the MapBrowserPointerEvent matches the PointerEvent type.\n   * @param {import(\"./pointer/PointerEvent.js\").default} pointerEvent Pointer\n   * event.\n   * @private\n   */\n  relayEvent_(pointerEvent) {\n    const dragging = !!(this.down_ && this.isMoving_(pointerEvent));\n    this.dispatchEvent(new MapBrowserPointerEvent(\n      pointerEvent.type, this.map_, pointerEvent, dragging));\n  }\n\n  /**\n   * @param {import(\"./pointer/PointerEvent.js\").default} pointerEvent Pointer\n   * event.\n   * @return {boolean} Is moving.\n   * @private\n   */\n  isMoving_(pointerEvent) {\n    return this.dragging_ ||\n        Math.abs(pointerEvent.clientX - this.down_.clientX) > this.moveTolerance_ ||\n        Math.abs(pointerEvent.clientY - this.down_.clientY) > this.moveTolerance_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    if (this.relayedListenerKey_) {\n      unlistenByKey(this.relayedListenerKey_);\n      this.relayedListenerKey_ = null;\n    }\n    if (this.pointerdownListenerKey_) {\n      unlistenByKey(this.pointerdownListenerKey_);\n      this.pointerdownListenerKey_ = null;\n    }\n\n    this.dragListenerKeys_.forEach(unlistenByKey);\n    this.dragListenerKeys_.length = 0;\n\n    if (this.documentPointerEventHandler_) {\n      this.documentPointerEventHandler_.dispose();\n      this.documentPointerEventHandler_ = null;\n    }\n    if (this.pointerEventHandler_) {\n      this.pointerEventHandler_.dispose();\n      this.pointerEventHandler_ = null;\n    }\n    super.disposeInternal();\n  }\n}\n\n\nexport default MapBrowserEventHandler;\n","/**\n * @module ol/MapEventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n\n  /**\n   * Triggered after a map frame is rendered.\n   * @event module:ol/MapEvent~MapEvent#postrender\n   * @api\n   */\n  POSTRENDER: 'postrender',\n\n  /**\n   * Triggered when the map starts moving.\n   * @event module:ol/MapEvent~MapEvent#movestart\n   * @api\n   */\n  MOVESTART: 'movestart',\n\n  /**\n   * Triggered after the map is moved.\n   * @event module:ol/MapEvent~MapEvent#moveend\n   * @api\n   */\n  MOVEEND: 'moveend'\n\n};\n","/**\n * @module ol/MapProperty\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  LAYERGROUP: 'layergroup',\n  SIZE: 'size',\n  TARGET: 'target',\n  VIEW: 'view'\n};\n","/**\n * @module ol/render/EventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  /**\n   * @event module:ol/render/Event~RenderEvent#postcompose\n   * @api\n   */\n  POSTCOMPOSE: 'postcompose',\n  /**\n   * @event module:ol/render/Event~RenderEvent#precompose\n   * @api\n   */\n  PRECOMPOSE: 'precompose',\n  /**\n   * @event module:ol/render/Event~RenderEvent#render\n   * @api\n   */\n  RENDER: 'render',\n  /**\n   * Triggered when rendering is complete, i.e. all sources and tiles have\n   * finished loading for the current viewport, and all tiles are faded in.\n   * @event module:ol/render/Event~RenderEvent#rendercomplete\n   * @api\n   */\n  RENDERCOMPLETE: 'rendercomplete'\n};\n","/**\n * @module ol/TileState\n */\n\n/**\n * @enum {number}\n */\nexport default {\n  IDLE: 0,\n  LOADING: 1,\n  LOADED: 2,\n  /**\n   * Indicates that tile loading failed\n   * @type {number}\n   */\n  ERROR: 3,\n  EMPTY: 4,\n  ABORT: 5\n};\n","/**\n * @module ol/asserts\n */\nimport AssertionError from './AssertionError.js';\n\n/**\n * @param {*} assertion Assertion we expected to be truthy.\n * @param {number} errorCode Error code.\n */\nexport function assert(assertion, errorCode) {\n  if (!assertion) {\n    throw new AssertionError(errorCode);\n  }\n}\n","/**\n * @module ol/structs/PriorityQueue\n */\nimport {assert} from '../asserts.js';\nimport {clear} from '../obj.js';\n\n\n/**\n * @type {number}\n */\nexport const DROP = Infinity;\n\n\n/**\n * @classdesc\n * Priority queue.\n *\n * The implementation is inspired from the Closure Library's Heap class and\n * Python's heapq module.\n *\n * See http://closure-library.googlecode.com/svn/docs/closure_goog_structs_heap.js.source.html\n * and http://hg.python.org/cpython/file/2.7/Lib/heapq.py.\n *\n * @template T\n */\nclass PriorityQueue {\n\n  /**\n   * @param {function(T): number} priorityFunction Priority function.\n   * @param {function(T): string} keyFunction Key function.\n   */\n  constructor(priorityFunction, keyFunction) {\n\n    /**\n     * @type {function(T): number}\n     * @private\n     */\n    this.priorityFunction_ = priorityFunction;\n\n    /**\n     * @type {function(T): string}\n     * @private\n     */\n    this.keyFunction_ = keyFunction;\n\n    /**\n     * @type {Array<T>}\n     * @private\n     */\n    this.elements_ = [];\n\n    /**\n     * @type {Array<number>}\n     * @private\n     */\n    this.priorities_ = [];\n\n    /**\n     * @type {!Object<string, boolean>}\n     * @private\n     */\n    this.queuedElements_ = {};\n\n  }\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  clear() {\n    this.elements_.length = 0;\n    this.priorities_.length = 0;\n    clear(this.queuedElements_);\n  }\n\n\n  /**\n   * Remove and return the highest-priority element. O(log N).\n   * @return {T} Element.\n   */\n  dequeue() {\n    const elements = this.elements_;\n    const priorities = this.priorities_;\n    const element = elements[0];\n    if (elements.length == 1) {\n      elements.length = 0;\n      priorities.length = 0;\n    } else {\n      elements[0] = elements.pop();\n      priorities[0] = priorities.pop();\n      this.siftUp_(0);\n    }\n    const elementKey = this.keyFunction_(element);\n    delete this.queuedElements_[elementKey];\n    return element;\n  }\n\n\n  /**\n   * Enqueue an element. O(log N).\n   * @param {T} element Element.\n   * @return {boolean} The element was added to the queue.\n   */\n  enqueue(element) {\n    assert(!(this.keyFunction_(element) in this.queuedElements_),\n      31); // Tried to enqueue an `element` that was already added to the queue\n    const priority = this.priorityFunction_(element);\n    if (priority != DROP) {\n      this.elements_.push(element);\n      this.priorities_.push(priority);\n      this.queuedElements_[this.keyFunction_(element)] = true;\n      this.siftDown_(0, this.elements_.length - 1);\n      return true;\n    }\n    return false;\n  }\n\n\n  /**\n   * @return {number} Count.\n   */\n  getCount() {\n    return this.elements_.length;\n  }\n\n\n  /**\n   * Gets the index of the left child of the node at the given index.\n   * @param {number} index The index of the node to get the left child for.\n   * @return {number} The index of the left child.\n   * @private\n   */\n  getLeftChildIndex_(index) {\n    return index * 2 + 1;\n  }\n\n\n  /**\n   * Gets the index of the right child of the node at the given index.\n   * @param {number} index The index of the node to get the right child for.\n   * @return {number} The index of the right child.\n   * @private\n   */\n  getRightChildIndex_(index) {\n    return index * 2 + 2;\n  }\n\n\n  /**\n   * Gets the index of the parent of the node at the given index.\n   * @param {number} index The index of the node to get the parent for.\n   * @return {number} The index of the parent.\n   * @private\n   */\n  getParentIndex_(index) {\n    return (index - 1) >> 1;\n  }\n\n\n  /**\n   * Make this a heap. O(N).\n   * @private\n   */\n  heapify_() {\n    let i;\n    for (i = (this.elements_.length >> 1) - 1; i >= 0; i--) {\n      this.siftUp_(i);\n    }\n  }\n\n\n  /**\n   * @return {boolean} Is empty.\n   */\n  isEmpty() {\n    return this.elements_.length === 0;\n  }\n\n\n  /**\n   * @param {string} key Key.\n   * @return {boolean} Is key queued.\n   */\n  isKeyQueued(key) {\n    return key in this.queuedElements_;\n  }\n\n\n  /**\n   * @param {T} element Element.\n   * @return {boolean} Is queued.\n   */\n  isQueued(element) {\n    return this.isKeyQueued(this.keyFunction_(element));\n  }\n\n\n  /**\n   * @param {number} index The index of the node to move down.\n   * @private\n   */\n  siftUp_(index) {\n    const elements = this.elements_;\n    const priorities = this.priorities_;\n    const count = elements.length;\n    const element = elements[index];\n    const priority = priorities[index];\n    const startIndex = index;\n\n    while (index < (count >> 1)) {\n      const lIndex = this.getLeftChildIndex_(index);\n      const rIndex = this.getRightChildIndex_(index);\n\n      const smallerChildIndex = rIndex < count &&\n          priorities[rIndex] < priorities[lIndex] ?\n        rIndex : lIndex;\n\n      elements[index] = elements[smallerChildIndex];\n      priorities[index] = priorities[smallerChildIndex];\n      index = smallerChildIndex;\n    }\n\n    elements[index] = element;\n    priorities[index] = priority;\n    this.siftDown_(startIndex, index);\n  }\n\n\n  /**\n   * @param {number} startIndex The index of the root.\n   * @param {number} index The index of the node to move up.\n   * @private\n   */\n  siftDown_(startIndex, index) {\n    const elements = this.elements_;\n    const priorities = this.priorities_;\n    const element = elements[index];\n    const priority = priorities[index];\n\n    while (index > startIndex) {\n      const parentIndex = this.getParentIndex_(index);\n      if (priorities[parentIndex] > priority) {\n        elements[index] = elements[parentIndex];\n        priorities[index] = priorities[parentIndex];\n        index = parentIndex;\n      } else {\n        break;\n      }\n    }\n    elements[index] = element;\n    priorities[index] = priority;\n  }\n\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  reprioritize() {\n    const priorityFunction = this.priorityFunction_;\n    const elements = this.elements_;\n    const priorities = this.priorities_;\n    let index = 0;\n    const n = elements.length;\n    let element, i, priority;\n    for (i = 0; i < n; ++i) {\n      element = elements[i];\n      priority = priorityFunction(element);\n      if (priority == DROP) {\n        delete this.queuedElements_[this.keyFunction_(element)];\n      } else {\n        priorities[index] = priority;\n        elements[index++] = element;\n      }\n    }\n    elements.length = index;\n    priorities.length = index;\n    this.heapify_();\n  }\n\n}\n\n\nexport default PriorityQueue;\n","/**\n * @module ol/TileQueue\n */\nimport TileState from './TileState.js';\nimport {listen, unlisten} from './events.js';\nimport EventType from './events/EventType.js';\nimport PriorityQueue from './structs/PriorityQueue.js';\n\n\n/**\n * @typedef {function(import(\"./Tile.js\").default, string, import(\"./coordinate.js\").Coordinate, number): number} PriorityFunction\n */\n\n\nclass TileQueue extends PriorityQueue {\n\n  /**\n   * @param {PriorityFunction} tilePriorityFunction Tile priority function.\n   * @param {function(): ?} tileChangeCallback Function called on each tile change event.\n   */\n  constructor(tilePriorityFunction, tileChangeCallback) {\n\n    super(\n      /**\n       * @param {Array} element Element.\n       * @return {number} Priority.\n       */\n      function(element) {\n        return tilePriorityFunction.apply(null, element);\n      },\n      /**\n       * @param {Array} element Element.\n       * @return {string} Key.\n       */\n      function(element) {\n        return (/** @type {import(\"./Tile.js\").default} */ (element[0]).getKey());\n      });\n\n    /**\n     * @private\n     * @type {function(): ?}\n     */\n    this.tileChangeCallback_ = tileChangeCallback;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.tilesLoading_ = 0;\n\n    /**\n     * @private\n     * @type {!Object<string,boolean>}\n     */\n    this.tilesLoadingKeys_ = {};\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  enqueue(element) {\n    const added = super.enqueue(element);\n    if (added) {\n      const tile = element[0];\n      listen(tile, EventType.CHANGE, this.handleTileChange, this);\n    }\n    return added;\n  }\n\n  /**\n   * @return {number} Number of tiles loading.\n   */\n  getTilesLoading() {\n    return this.tilesLoading_;\n  }\n\n  /**\n   * @param {import(\"./events/Event.js\").default} event Event.\n   * @protected\n   */\n  handleTileChange(event) {\n    const tile = /** @type {import(\"./Tile.js\").default} */ (event.target);\n    const state = tile.getState();\n    if (state === TileState.LOADED || state === TileState.ERROR ||\n        state === TileState.EMPTY || state === TileState.ABORT) {\n      unlisten(tile, EventType.CHANGE, this.handleTileChange, this);\n      const tileKey = tile.getKey();\n      if (tileKey in this.tilesLoadingKeys_) {\n        delete this.tilesLoadingKeys_[tileKey];\n        --this.tilesLoading_;\n      }\n      this.tileChangeCallback_();\n    }\n  }\n\n  /**\n   * @param {number} maxTotalLoading Maximum number tiles to load simultaneously.\n   * @param {number} maxNewLoads Maximum number of new tiles to load.\n   */\n  loadMoreTiles(maxTotalLoading, maxNewLoads) {\n    let newLoads = 0;\n    let abortedTiles = false;\n    let state, tile, tileKey;\n    while (this.tilesLoading_ < maxTotalLoading && newLoads < maxNewLoads &&\n           this.getCount() > 0) {\n      tile = /** @type {import(\"./Tile.js\").default} */ (this.dequeue()[0]);\n      tileKey = tile.getKey();\n      state = tile.getState();\n      if (state === TileState.ABORT) {\n        abortedTiles = true;\n      } else if (state === TileState.IDLE && !(tileKey in this.tilesLoadingKeys_)) {\n        this.tilesLoadingKeys_[tileKey] = true;\n        ++this.tilesLoading_;\n        ++newLoads;\n        tile.load();\n      }\n    }\n    if (newLoads === 0 && abortedTiles) {\n      // Do not stop the render loop when all wanted tiles were aborted due to\n      // a small, saturated tile cache.\n      this.tileChangeCallback_();\n    }\n  }\n}\n\n\nexport default TileQueue;\n","/**\n * @module ol/tilegrid/common\n */\n\n/**\n * Default maximum zoom for default tile grids.\n * @type {number}\n */\nexport const DEFAULT_MAX_ZOOM = 42;\n\n/**\n * Default tile size.\n * @type {number}\n */\nexport const DEFAULT_TILE_SIZE = 256;\n","/**\n * @module ol/math\n */\nimport {assert} from './asserts.js';\n\n/**\n * Takes a number and clamps it to within the provided bounds.\n * @param {number} value The input number.\n * @param {number} min The minimum value to return.\n * @param {number} max The maximum value to return.\n * @return {number} The input number if it is within bounds, or the nearest\n *     number within the bounds.\n */\nexport function clamp(value, min, max) {\n  return Math.min(Math.max(value, min), max);\n}\n\n\n/**\n * Return the hyperbolic cosine of a given number. The method will use the\n * native `Math.cosh` function if it is available, otherwise the hyperbolic\n * cosine will be calculated via the reference implementation of the Mozilla\n * developer network.\n *\n * @param {number} x X.\n * @return {number} Hyperbolic cosine of x.\n */\nexport const cosh = (function() {\n  // Wrapped in a iife, to save the overhead of checking for the native\n  // implementation on every invocation.\n  let cosh;\n  if ('cosh' in Math) {\n    // The environment supports the native Math.cosh function, use it…\n    cosh = Math.cosh;\n  } else {\n    // … else, use the reference implementation of MDN:\n    cosh = function(x) {\n      const y = /** @type {Math} */ (Math).exp(x);\n      return (y + 1 / y) / 2;\n    };\n  }\n  return cosh;\n}());\n\n\n/**\n * @param {number} x X.\n * @return {number} The smallest power of two greater than or equal to x.\n */\nexport function roundUpToPowerOfTwo(x) {\n  assert(0 < x, 29); // `x` must be greater than `0`\n  return Math.pow(2, Math.ceil(Math.log(x) / Math.LN2));\n}\n\n\n/**\n * Returns the square of the closest distance between the point (x, y) and the\n * line segment (x1, y1) to (x2, y2).\n * @param {number} x X.\n * @param {number} y Y.\n * @param {number} x1 X1.\n * @param {number} y1 Y1.\n * @param {number} x2 X2.\n * @param {number} y2 Y2.\n * @return {number} Squared distance.\n */\nexport function squaredSegmentDistance(x, y, x1, y1, x2, y2) {\n  const dx = x2 - x1;\n  const dy = y2 - y1;\n  if (dx !== 0 || dy !== 0) {\n    const t = ((x - x1) * dx + (y - y1) * dy) / (dx * dx + dy * dy);\n    if (t > 1) {\n      x1 = x2;\n      y1 = y2;\n    } else if (t > 0) {\n      x1 += dx * t;\n      y1 += dy * t;\n    }\n  }\n  return squaredDistance(x, y, x1, y1);\n}\n\n\n/**\n * Returns the square of the distance between the points (x1, y1) and (x2, y2).\n * @param {number} x1 X1.\n * @param {number} y1 Y1.\n * @param {number} x2 X2.\n * @param {number} y2 Y2.\n * @return {number} Squared distance.\n */\nexport function squaredDistance(x1, y1, x2, y2) {\n  const dx = x2 - x1;\n  const dy = y2 - y1;\n  return dx * dx + dy * dy;\n}\n\n\n/**\n * Solves system of linear equations using Gaussian elimination method.\n *\n * @param {Array<Array<number>>} mat Augmented matrix (n x n + 1 column)\n *                                     in row-major order.\n * @return {Array<number>} The resulting vector.\n */\nexport function solveLinearSystem(mat) {\n  const n = mat.length;\n\n  for (let i = 0; i < n; i++) {\n    // Find max in the i-th column (ignoring i - 1 first rows)\n    let maxRow = i;\n    let maxEl = Math.abs(mat[i][i]);\n    for (let r = i + 1; r < n; r++) {\n      const absValue = Math.abs(mat[r][i]);\n      if (absValue > maxEl) {\n        maxEl = absValue;\n        maxRow = r;\n      }\n    }\n\n    if (maxEl === 0) {\n      return null; // matrix is singular\n    }\n\n    // Swap max row with i-th (current) row\n    const tmp = mat[maxRow];\n    mat[maxRow] = mat[i];\n    mat[i] = tmp;\n\n    // Subtract the i-th row to make all the remaining rows 0 in the i-th column\n    for (let j = i + 1; j < n; j++) {\n      const coef = -mat[j][i] / mat[i][i];\n      for (let k = i; k < n + 1; k++) {\n        if (i == k) {\n          mat[j][k] = 0;\n        } else {\n          mat[j][k] += coef * mat[i][k];\n        }\n      }\n    }\n  }\n\n  // Solve Ax=b for upper triangular matrix A (mat)\n  const x = new Array(n);\n  for (let l = n - 1; l >= 0; l--) {\n    x[l] = mat[l][n] / mat[l][l];\n    for (let m = l - 1; m >= 0; m--) {\n      mat[m][n] -= mat[m][l] * x[l];\n    }\n  }\n  return x;\n}\n\n\n/**\n * Converts radians to to degrees.\n *\n * @param {number} angleInRadians Angle in radians.\n * @return {number} Angle in degrees.\n */\nexport function toDegrees(angleInRadians) {\n  return angleInRadians * 180 / Math.PI;\n}\n\n\n/**\n * Converts degrees to radians.\n *\n * @param {number} angleInDegrees Angle in degrees.\n * @return {number} Angle in radians.\n */\nexport function toRadians(angleInDegrees) {\n  return angleInDegrees * Math.PI / 180;\n}\n\n/**\n * Returns the modulo of a / b, depending on the sign of b.\n *\n * @param {number} a Dividend.\n * @param {number} b Divisor.\n * @return {number} Modulo.\n */\nexport function modulo(a, b) {\n  const r = a % b;\n  return r * b < 0 ? r + b : r;\n}\n\n/**\n * Calculates the linearly interpolated value of x between a and b.\n *\n * @param {number} a Number\n * @param {number} b Number\n * @param {number} x Value to be interpolated.\n * @return {number} Interpolated value.\n */\nexport function lerp(a, b, x) {\n  return a + x * (b - a);\n}\n","/**\n * @module ol/centerconstraint\n */\nimport {clamp} from './math.js';\n\n\n/**\n * @typedef {function((import(\"./coordinate.js\").Coordinate|undefined)): (import(\"./coordinate.js\").Coordinate|undefined)} Type\n */\n\n\n/**\n * @param {import(\"./extent.js\").Extent} extent Extent.\n * @return {Type} The constraint.\n */\nexport function createExtent(extent) {\n  return (\n    /**\n     * @param {import(\"./coordinate.js\").Coordinate=} center Center.\n     * @return {import(\"./coordinate.js\").Coordinate|undefined} Center.\n     */\n    function(center) {\n      if (center) {\n        return [\n          clamp(center[0], extent[0], extent[2]),\n          clamp(center[1], extent[1], extent[3])\n        ];\n      } else {\n        return undefined;\n      }\n    }\n  );\n}\n\n\n/**\n * @param {import(\"./coordinate.js\").Coordinate=} center Center.\n * @return {import(\"./coordinate.js\").Coordinate|undefined} Center.\n */\nexport function none(center) {\n  return center;\n}\n","/**\n * @module ol/resolutionconstraint\n */\nimport {linearFindNearest} from './array.js';\nimport {clamp} from './math.js';\n\n\n/**\n * @typedef {function((number|undefined), number, number): (number|undefined)} Type\n */\n\n\n/**\n * @param {Array<number>} resolutions Resolutions.\n * @return {Type} Zoom function.\n */\nexport function createSnapToResolutions(resolutions) {\n  return (\n    /**\n     * @param {number|undefined} resolution Resolution.\n     * @param {number} delta Delta.\n     * @param {number} direction Direction.\n     * @return {number|undefined} Resolution.\n     */\n    function(resolution, delta, direction) {\n      if (resolution !== undefined) {\n        let z = linearFindNearest(resolutions, resolution, direction);\n        z = clamp(z + delta, 0, resolutions.length - 1);\n        const index = Math.floor(z);\n        if (z != index && index < resolutions.length - 1) {\n          const power = resolutions[index] / resolutions[index + 1];\n          return resolutions[index] / Math.pow(power, z - index);\n        } else {\n          return resolutions[index];\n        }\n      } else {\n        return undefined;\n      }\n    }\n  );\n}\n\n\n/**\n * @param {number} power Power.\n * @param {number} maxResolution Maximum resolution.\n * @param {number=} opt_maxLevel Maximum level.\n * @return {Type} Zoom function.\n */\nexport function createSnapToPower(power, maxResolution, opt_maxLevel) {\n  return (\n    /**\n     * @param {number|undefined} resolution Resolution.\n     * @param {number} delta Delta.\n     * @param {number} direction Direction.\n     * @return {number|undefined} Resolution.\n     */\n    function(resolution, delta, direction) {\n      if (resolution !== undefined) {\n        const offset = -direction / 2 + 0.5;\n        const oldLevel = Math.floor(\n          Math.log(maxResolution / resolution) / Math.log(power) + offset);\n        let newLevel = Math.max(oldLevel + delta, 0);\n        if (opt_maxLevel !== undefined) {\n          newLevel = Math.min(newLevel, opt_maxLevel);\n        }\n        return maxResolution / Math.pow(power, newLevel);\n      } else {\n        return undefined;\n      }\n    });\n}\n","/**\n * @module ol/rotationconstraint\n */\nimport {toRadians} from './math.js';\n\n\n/**\n * @typedef {function((number|undefined), number): (number|undefined)} Type\n */\n\n\n/**\n * @param {number|undefined} rotation Rotation.\n * @param {number} delta Delta.\n * @return {number|undefined} Rotation.\n */\nexport function disable(rotation, delta) {\n  if (rotation !== undefined) {\n    return 0;\n  } else {\n    return undefined;\n  }\n}\n\n\n/**\n * @param {number|undefined} rotation Rotation.\n * @param {number} delta Delta.\n * @return {number|undefined} Rotation.\n */\nexport function none(rotation, delta) {\n  if (rotation !== undefined) {\n    return rotation + delta;\n  } else {\n    return undefined;\n  }\n}\n\n\n/**\n * @param {number} n N.\n * @return {Type} Rotation constraint.\n */\nexport function createSnapToN(n) {\n  const theta = 2 * Math.PI / n;\n  return (\n    /**\n     * @param {number|undefined} rotation Rotation.\n     * @param {number} delta Delta.\n     * @return {number|undefined} Rotation.\n     */\n    function(rotation, delta) {\n      if (rotation !== undefined) {\n        rotation = Math.floor((rotation + delta) / theta + 0.5) * theta;\n        return rotation;\n      } else {\n        return undefined;\n      }\n    });\n}\n\n\n/**\n * @param {number=} opt_tolerance Tolerance.\n * @return {Type} Rotation constraint.\n */\nexport function createSnapToZero(opt_tolerance) {\n  const tolerance = opt_tolerance || toRadians(5);\n  return (\n    /**\n     * @param {number|undefined} rotation Rotation.\n     * @param {number} delta Delta.\n     * @return {number|undefined} Rotation.\n     */\n    function(rotation, delta) {\n      if (rotation !== undefined) {\n        if (Math.abs(rotation + delta) <= tolerance) {\n          return 0;\n        } else {\n          return rotation + delta;\n        }\n      } else {\n        return undefined;\n      }\n    });\n}\n","/**\n * @module ol/ViewHint\n */\n\n/**\n * @enum {number}\n */\nexport default {\n  ANIMATING: 0,\n  INTERACTING: 1\n};\n","/**\n * @module ol/ViewProperty\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  CENTER: 'center',\n  RESOLUTION: 'resolution',\n  ROTATION: 'rotation'\n};\n","/**\n * @module ol/string\n */\n\n/**\n * @param {number} number Number to be formatted\n * @param {number} width The desired width\n * @param {number=} opt_precision Precision of the output string (i.e. number of decimal places)\n * @returns {string} Formatted string\n */\nexport function padNumber(number, width, opt_precision) {\n  const numberString = opt_precision !== undefined ? number.toFixed(opt_precision) : '' + number;\n  let decimal = numberString.indexOf('.');\n  decimal = decimal === -1 ? numberString.length : decimal;\n  return decimal > width ? numberString : new Array(1 + width - decimal).join('0') + numberString;\n}\n\n\n/**\n * Adapted from https://github.com/omichelsen/compare-versions/blob/master/index.js\n * @param {string|number} v1 First version\n * @param {string|number} v2 Second version\n * @returns {number} Value\n */\nexport function compareVersions(v1, v2) {\n  const s1 = ('' + v1).split('.');\n  const s2 = ('' + v2).split('.');\n\n  for (let i = 0; i < Math.max(s1.length, s2.length); i++) {\n    const n1 = parseInt(s1[i] || '0', 10);\n    const n2 = parseInt(s2[i] || '0', 10);\n\n    if (n1 > n2) {\n      return 1;\n    }\n    if (n2 > n1) {\n      return -1;\n    }\n  }\n\n  return 0;\n}\n","/**\n * @module ol/coordinate\n */\nimport {modulo} from './math.js';\nimport {padNumber} from './string.js';\n\n\n/**\n * An array of numbers representing an xy coordinate. Example: `[16, 48]`.\n * @typedef {Array<number>} Coordinate\n * @api\n */\n\n\n/**\n * A function that takes a {@link module:ol/coordinate~Coordinate} and\n * transforms it into a `{string}`.\n *\n * @typedef {function((Coordinate|undefined)): string} CoordinateFormat\n * @api\n */\n\n\n/**\n * Add `delta` to `coordinate`. `coordinate` is modified in place and returned\n * by the function.\n *\n * Example:\n *\n *     import {add} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     add(coord, [-2, 4]);\n *     // coord is now [5.85, 51.983333]\n *\n * @param {Coordinate} coordinate Coordinate.\n * @param {Coordinate} delta Delta.\n * @return {Coordinate} The input coordinate adjusted by\n * the given delta.\n * @api\n */\nexport function add(coordinate, delta) {\n  coordinate[0] += delta[0];\n  coordinate[1] += delta[1];\n  return coordinate;\n}\n\n\n/**\n * Calculates the point closest to the passed coordinate on the passed circle.\n *\n * @param {Coordinate} coordinate The coordinate.\n * @param {import(\"./geom/Circle.js\").default} circle The circle.\n * @return {Coordinate} Closest point on the circumference.\n */\nexport function closestOnCircle(coordinate, circle) {\n  const r = circle.getRadius();\n  const center = circle.getCenter();\n  const x0 = center[0];\n  const y0 = center[1];\n  const x1 = coordinate[0];\n  const y1 = coordinate[1];\n\n  let dx = x1 - x0;\n  const dy = y1 - y0;\n  if (dx === 0 && dy === 0) {\n    dx = 1;\n  }\n  const d = Math.sqrt(dx * dx + dy * dy);\n\n  const x = x0 + r * dx / d;\n  const y = y0 + r * dy / d;\n\n  return [x, y];\n}\n\n\n/**\n * Calculates the point closest to the passed coordinate on the passed segment.\n * This is the foot of the perpendicular of the coordinate to the segment when\n * the foot is on the segment, or the closest segment coordinate when the foot\n * is outside the segment.\n *\n * @param {Coordinate} coordinate The coordinate.\n * @param {Array<Coordinate>} segment The two coordinates\n * of the segment.\n * @return {Coordinate} The foot of the perpendicular of\n * the coordinate to the segment.\n */\nexport function closestOnSegment(coordinate, segment) {\n  const x0 = coordinate[0];\n  const y0 = coordinate[1];\n  const start = segment[0];\n  const end = segment[1];\n  const x1 = start[0];\n  const y1 = start[1];\n  const x2 = end[0];\n  const y2 = end[1];\n  const dx = x2 - x1;\n  const dy = y2 - y1;\n  const along = (dx === 0 && dy === 0) ? 0 :\n    ((dx * (x0 - x1)) + (dy * (y0 - y1))) / ((dx * dx + dy * dy) || 0);\n  let x, y;\n  if (along <= 0) {\n    x = x1;\n    y = y1;\n  } else if (along >= 1) {\n    x = x2;\n    y = y2;\n  } else {\n    x = x1 + along * dx;\n    y = y1 + along * dy;\n  }\n  return [x, y];\n}\n\n\n/**\n * Returns a {@link module:ol/coordinate~CoordinateFormat} function that can be\n * used to format\n * a {Coordinate} to a string.\n *\n * Example without specifying the fractional digits:\n *\n *     import {createStringXY} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var stringifyFunc = createStringXY();\n *     var out = stringifyFunc(coord);\n *     // out is now '8, 48'\n *\n * Example with explicitly specifying 2 fractional digits:\n *\n *     import {createStringXY} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var stringifyFunc = createStringXY(2);\n *     var out = stringifyFunc(coord);\n *     // out is now '7.85, 47.98'\n *\n * @param {number=} opt_fractionDigits The number of digits to include\n *    after the decimal point. Default is `0`.\n * @return {CoordinateFormat} Coordinate format.\n * @api\n */\nexport function createStringXY(opt_fractionDigits) {\n  return (\n    /**\n     * @param {Coordinate} coordinate Coordinate.\n     * @return {string} String XY.\n     */\n    function(coordinate) {\n      return toStringXY(coordinate, opt_fractionDigits);\n    }\n  );\n}\n\n\n/**\n * @param {string} hemispheres Hemispheres.\n * @param {number} degrees Degrees.\n * @param {number=} opt_fractionDigits The number of digits to include\n *    after the decimal point. Default is `0`.\n * @return {string} String.\n */\nexport function degreesToStringHDMS(hemispheres, degrees, opt_fractionDigits) {\n  const normalizedDegrees = modulo(degrees + 180, 360) - 180;\n  const x = Math.abs(3600 * normalizedDegrees);\n  const dflPrecision = opt_fractionDigits || 0;\n  const precision = Math.pow(10, dflPrecision);\n\n  let deg = Math.floor(x / 3600);\n  let min = Math.floor((x - deg * 3600) / 60);\n  let sec = x - (deg * 3600) - (min * 60);\n  sec = Math.ceil(sec * precision) / precision;\n\n  if (sec >= 60) {\n    sec = 0;\n    min += 1;\n  }\n\n  if (min >= 60) {\n    min = 0;\n    deg += 1;\n  }\n\n  return deg + '\\u00b0 ' + padNumber(min, 2) + '\\u2032 ' +\n    padNumber(sec, 2, dflPrecision) + '\\u2033' +\n    (normalizedDegrees == 0 ? '' : ' ' + hemispheres.charAt(normalizedDegrees < 0 ? 1 : 0));\n}\n\n\n/**\n * Transforms the given {@link module:ol/coordinate~Coordinate} to a string\n * using the given string template. The strings `{x}` and `{y}` in the template\n * will be replaced with the first and second coordinate values respectively.\n *\n * Example without specifying the fractional digits:\n *\n *     import {format} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var template = 'Coordinate is ({x}|{y}).';\n *     var out = format(coord, template);\n *     // out is now 'Coordinate is (8|48).'\n *\n * Example explicitly specifying the fractional digits:\n *\n *     import {format} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var template = 'Coordinate is ({x}|{y}).';\n *     var out = format(coord, template, 2);\n *     // out is now 'Coordinate is (7.85|47.98).'\n *\n * @param {Coordinate} coordinate Coordinate.\n * @param {string} template A template string with `{x}` and `{y}` placeholders\n *     that will be replaced by first and second coordinate values.\n * @param {number=} opt_fractionDigits The number of digits to include\n *    after the decimal point. Default is `0`.\n * @return {string} Formatted coordinate.\n * @api\n */\nexport function format(coordinate, template, opt_fractionDigits) {\n  if (coordinate) {\n    return template\n      .replace('{x}', coordinate[0].toFixed(opt_fractionDigits))\n      .replace('{y}', coordinate[1].toFixed(opt_fractionDigits));\n  } else {\n    return '';\n  }\n}\n\n\n/**\n * @param {Coordinate} coordinate1 First coordinate.\n * @param {Coordinate} coordinate2 Second coordinate.\n * @return {boolean} The two coordinates are equal.\n */\nexport function equals(coordinate1, coordinate2) {\n  let equals = true;\n  for (let i = coordinate1.length - 1; i >= 0; --i) {\n    if (coordinate1[i] != coordinate2[i]) {\n      equals = false;\n      break;\n    }\n  }\n  return equals;\n}\n\n\n/**\n * Rotate `coordinate` by `angle`. `coordinate` is modified in place and\n * returned by the function.\n *\n * Example:\n *\n *     import {rotate} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var rotateRadians = Math.PI / 2; // 90 degrees\n *     rotate(coord, rotateRadians);\n *     // coord is now [-47.983333, 7.85]\n *\n * @param {Coordinate} coordinate Coordinate.\n * @param {number} angle Angle in radian.\n * @return {Coordinate} Coordinate.\n * @api\n */\nexport function rotate(coordinate, angle) {\n  const cosAngle = Math.cos(angle);\n  const sinAngle = Math.sin(angle);\n  const x = coordinate[0] * cosAngle - coordinate[1] * sinAngle;\n  const y = coordinate[1] * cosAngle + coordinate[0] * sinAngle;\n  coordinate[0] = x;\n  coordinate[1] = y;\n  return coordinate;\n}\n\n\n/**\n * Scale `coordinate` by `scale`. `coordinate` is modified in place and returned\n * by the function.\n *\n * Example:\n *\n *     import {scale as scaleCoordinate} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var scale = 1.2;\n *     scaleCoordinate(coord, scale);\n *     // coord is now [9.42, 57.5799996]\n *\n * @param {Coordinate} coordinate Coordinate.\n * @param {number} scale Scale factor.\n * @return {Coordinate} Coordinate.\n */\nexport function scale(coordinate, scale) {\n  coordinate[0] *= scale;\n  coordinate[1] *= scale;\n  return coordinate;\n}\n\n\n/**\n * @param {Coordinate} coord1 First coordinate.\n * @param {Coordinate} coord2 Second coordinate.\n * @return {number} Squared distance between coord1 and coord2.\n */\nexport function squaredDistance(coord1, coord2) {\n  const dx = coord1[0] - coord2[0];\n  const dy = coord1[1] - coord2[1];\n  return dx * dx + dy * dy;\n}\n\n\n/**\n * @param {Coordinate} coord1 First coordinate.\n * @param {Coordinate} coord2 Second coordinate.\n * @return {number} Distance between coord1 and coord2.\n */\nexport function distance(coord1, coord2) {\n  return Math.sqrt(squaredDistance(coord1, coord2));\n}\n\n\n/**\n * Calculate the squared distance from a coordinate to a line segment.\n *\n * @param {Coordinate} coordinate Coordinate of the point.\n * @param {Array<Coordinate>} segment Line segment (2\n * coordinates).\n * @return {number} Squared distance from the point to the line segment.\n */\nexport function squaredDistanceToSegment(coordinate, segment) {\n  return squaredDistance(coordinate,\n    closestOnSegment(coordinate, segment));\n}\n\n\n/**\n * Format a geographic coordinate with the hemisphere, degrees, minutes, and\n * seconds.\n *\n * Example without specifying fractional digits:\n *\n *     import {toStringHDMS} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var out = toStringHDMS(coord);\n *     // out is now '47° 58′ 60″ N 7° 50′ 60″ E'\n *\n * Example explicitly specifying 1 fractional digit:\n *\n *     import {toStringHDMS} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var out = toStringHDMS(coord, 1);\n *     // out is now '47° 58′ 60.0″ N 7° 50′ 60.0″ E'\n *\n * @param {Coordinate} coordinate Coordinate.\n * @param {number=} opt_fractionDigits The number of digits to include\n *    after the decimal point. Default is `0`.\n * @return {string} Hemisphere, degrees, minutes and seconds.\n * @api\n */\nexport function toStringHDMS(coordinate, opt_fractionDigits) {\n  if (coordinate) {\n    return degreesToStringHDMS('NS', coordinate[1], opt_fractionDigits) + ' ' +\n        degreesToStringHDMS('EW', coordinate[0], opt_fractionDigits);\n  } else {\n    return '';\n  }\n}\n\n\n/**\n * Format a coordinate as a comma delimited string.\n *\n * Example without specifying fractional digits:\n *\n *     import {toStringXY} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var out = toStringXY(coord);\n *     // out is now '8, 48'\n *\n * Example explicitly specifying 1 fractional digit:\n *\n *     import {toStringXY} from 'ol/coordinate';\n *\n *     var coord = [7.85, 47.983333];\n *     var out = toStringXY(coord, 1);\n *     // out is now '7.8, 48.0'\n *\n * @param {Coordinate} coordinate Coordinate.\n * @param {number=} opt_fractionDigits The number of digits to include\n *    after the decimal point. Default is `0`.\n * @return {string} XY.\n * @api\n */\nexport function toStringXY(coordinate, opt_fractionDigits) {\n  return format(coordinate, '{x}, {y}', opt_fractionDigits);\n}\n","/**\n * @module ol/easing\n */\n\n\n/**\n * Start slow and speed up.\n * @param {number} t Input between 0 and 1.\n * @return {number} Output between 0 and 1.\n * @api\n */\nexport function easeIn(t) {\n  return Math.pow(t, 3);\n}\n\n\n/**\n * Start fast and slow down.\n * @param {number} t Input between 0 and 1.\n * @return {number} Output between 0 and 1.\n * @api\n */\nexport function easeOut(t) {\n  return 1 - easeIn(1 - t);\n}\n\n\n/**\n * Start slow, speed up, and then slow down again.\n * @param {number} t Input between 0 and 1.\n * @return {number} Output between 0 and 1.\n * @api\n */\nexport function inAndOut(t) {\n  return 3 * t * t - 2 * t * t * t;\n}\n\n\n/**\n * Maintain a constant speed over time.\n * @param {number} t Input between 0 and 1.\n * @return {number} Output between 0 and 1.\n * @api\n */\nexport function linear(t) {\n  return t;\n}\n\n\n/**\n * Start slow, speed up, and at the very end slow down again.  This has the\n * same general behavior as {@link module:ol/easing~inAndOut}, but the final\n * slowdown is delayed.\n * @param {number} t Input between 0 and 1.\n * @return {number} Output between 0 and 1.\n * @api\n */\nexport function upAndDown(t) {\n  if (t < 0.5) {\n    return inAndOut(2 * t);\n  } else {\n    return 1 - inAndOut(2 * (t - 0.5));\n  }\n}\n","/**\n * @module ol/extent/Corner\n */\n\n/**\n * Extent corner.\n * @enum {string}\n */\nexport default {\n  BOTTOM_LEFT: 'bottom-left',\n  BOTTOM_RIGHT: 'bottom-right',\n  TOP_LEFT: 'top-left',\n  TOP_RIGHT: 'top-right'\n};\n","/**\n * @module ol/extent/Relationship\n */\n\n/**\n * Relationship to an extent.\n * @enum {number}\n */\nexport default {\n  UNKNOWN: 0,\n  INTERSECTING: 1,\n  ABOVE: 2,\n  RIGHT: 4,\n  BELOW: 8,\n  LEFT: 16\n};\n","/**\n * @module ol/extent\n */\nimport {assert} from './asserts.js';\nimport Corner from './extent/Corner.js';\nimport Relationship from './extent/Relationship.js';\n\n\n/**\n * An array of numbers representing an extent: `[minx, miny, maxx, maxy]`.\n * @typedef {Array<number>} Extent\n * @api\n */\n\n/**\n * Build an extent that includes all given coordinates.\n *\n * @param {Array<import(\"./coordinate.js\").Coordinate>} coordinates Coordinates.\n * @return {Extent} Bounding extent.\n * @api\n */\nexport function boundingExtent(coordinates) {\n  const extent = createEmpty();\n  for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n    extendCoordinate(extent, coordinates[i]);\n  }\n  return extent;\n}\n\n\n/**\n * @param {Array<number>} xs Xs.\n * @param {Array<number>} ys Ys.\n * @param {Extent=} opt_extent Destination extent.\n * @private\n * @return {Extent} Extent.\n */\nfunction _boundingExtentXYs(xs, ys, opt_extent) {\n  const minX = Math.min.apply(null, xs);\n  const minY = Math.min.apply(null, ys);\n  const maxX = Math.max.apply(null, xs);\n  const maxY = Math.max.apply(null, ys);\n  return createOrUpdate(minX, minY, maxX, maxY, opt_extent);\n}\n\n\n/**\n * Return extent increased by the provided value.\n * @param {Extent} extent Extent.\n * @param {number} value The amount by which the extent should be buffered.\n * @param {Extent=} opt_extent Extent.\n * @return {Extent} Extent.\n * @api\n */\nexport function buffer(extent, value, opt_extent) {\n  if (opt_extent) {\n    opt_extent[0] = extent[0] - value;\n    opt_extent[1] = extent[1] - value;\n    opt_extent[2] = extent[2] + value;\n    opt_extent[3] = extent[3] + value;\n    return opt_extent;\n  } else {\n    return [\n      extent[0] - value,\n      extent[1] - value,\n      extent[2] + value,\n      extent[3] + value\n    ];\n  }\n}\n\n\n/**\n * Creates a clone of an extent.\n *\n * @param {Extent} extent Extent to clone.\n * @param {Extent=} opt_extent Extent.\n * @return {Extent} The clone.\n */\nexport function clone(extent, opt_extent) {\n  if (opt_extent) {\n    opt_extent[0] = extent[0];\n    opt_extent[1] = extent[1];\n    opt_extent[2] = extent[2];\n    opt_extent[3] = extent[3];\n    return opt_extent;\n  } else {\n    return extent.slice();\n  }\n}\n\n\n/**\n * @param {Extent} extent Extent.\n * @param {number} x X.\n * @param {number} y Y.\n * @return {number} Closest squared distance.\n */\nexport function closestSquaredDistanceXY(extent, x, y) {\n  let dx, dy;\n  if (x < extent[0]) {\n    dx = extent[0] - x;\n  } else if (extent[2] < x) {\n    dx = x - extent[2];\n  } else {\n    dx = 0;\n  }\n  if (y < extent[1]) {\n    dy = extent[1] - y;\n  } else if (extent[3] < y) {\n    dy = y - extent[3];\n  } else {\n    dy = 0;\n  }\n  return dx * dx + dy * dy;\n}\n\n\n/**\n * Check if the passed coordinate is contained or on the edge of the extent.\n *\n * @param {Extent} extent Extent.\n * @param {import(\"./coordinate.js\").Coordinate} coordinate Coordinate.\n * @return {boolean} The coordinate is contained in the extent.\n * @api\n */\nexport function containsCoordinate(extent, coordinate) {\n  return containsXY(extent, coordinate[0], coordinate[1]);\n}\n\n\n/**\n * Check if one extent contains another.\n *\n * An extent is deemed contained if it lies completely within the other extent,\n * including if they share one or more edges.\n *\n * @param {Extent} extent1 Extent 1.\n * @param {Extent} extent2 Extent 2.\n * @return {boolean} The second extent is contained by or on the edge of the\n *     first.\n * @api\n */\nexport function containsExtent(extent1, extent2) {\n  return extent1[0] <= extent2[0] && extent2[2] <= extent1[2] &&\n      extent1[1] <= extent2[1] && extent2[3] <= extent1[3];\n}\n\n\n/**\n * Check if the passed coordinate is contained or on the edge of the extent.\n *\n * @param {Extent} extent Extent.\n * @param {number} x X coordinate.\n * @param {number} y Y coordinate.\n * @return {boolean} The x, y values are contained in the extent.\n * @api\n */\nexport function containsXY(extent, x, y) {\n  return extent[0] <= x && x <= extent[2] && extent[1] <= y && y <= extent[3];\n}\n\n\n/**\n * Get the relationship between a coordinate and extent.\n * @param {Extent} extent The extent.\n * @param {import(\"./coordinate.js\").Coordinate} coordinate The coordinate.\n * @return {Relationship} The relationship (bitwise compare with\n *     import(\"./extent/Relationship.js\").Relationship).\n */\nexport function coordinateRelationship(extent, coordinate) {\n  const minX = extent[0];\n  const minY = extent[1];\n  const maxX = extent[2];\n  const maxY = extent[3];\n  const x = coordinate[0];\n  const y = coordinate[1];\n  let relationship = Relationship.UNKNOWN;\n  if (x < minX) {\n    relationship = relationship | Relationship.LEFT;\n  } else if (x > maxX) {\n    relationship = relationship | Relationship.RIGHT;\n  }\n  if (y < minY) {\n    relationship = relationship | Relationship.BELOW;\n  } else if (y > maxY) {\n    relationship = relationship | Relationship.ABOVE;\n  }\n  if (relationship === Relationship.UNKNOWN) {\n    relationship = Relationship.INTERSECTING;\n  }\n  return relationship;\n}\n\n\n/**\n * Create an empty extent.\n * @return {Extent} Empty extent.\n * @api\n */\nexport function createEmpty() {\n  return [Infinity, Infinity, -Infinity, -Infinity];\n}\n\n\n/**\n * Create a new extent or update the provided extent.\n * @param {number} minX Minimum X.\n * @param {number} minY Minimum Y.\n * @param {number} maxX Maximum X.\n * @param {number} maxY Maximum Y.\n * @param {Extent=} opt_extent Destination extent.\n * @return {Extent} Extent.\n */\nexport function createOrUpdate(minX, minY, maxX, maxY, opt_extent) {\n  if (opt_extent) {\n    opt_extent[0] = minX;\n    opt_extent[1] = minY;\n    opt_extent[2] = maxX;\n    opt_extent[3] = maxY;\n    return opt_extent;\n  } else {\n    return [minX, minY, maxX, maxY];\n  }\n}\n\n\n/**\n * Create a new empty extent or make the provided one empty.\n * @param {Extent=} opt_extent Extent.\n * @return {Extent} Extent.\n */\nexport function createOrUpdateEmpty(opt_extent) {\n  return createOrUpdate(\n    Infinity, Infinity, -Infinity, -Infinity, opt_extent);\n}\n\n\n/**\n * @param {import(\"./coordinate.js\").Coordinate} coordinate Coordinate.\n * @param {Extent=} opt_extent Extent.\n * @return {Extent} Extent.\n */\nexport function createOrUpdateFromCoordinate(coordinate, opt_extent) {\n  const x = coordinate[0];\n  const y = coordinate[1];\n  return createOrUpdate(x, y, x, y, opt_extent);\n}\n\n\n/**\n * @param {Array<import(\"./coordinate.js\").Coordinate>} coordinates Coordinates.\n * @param {Extent=} opt_extent Extent.\n * @return {Extent} Extent.\n */\nexport function createOrUpdateFromCoordinates(coordinates, opt_extent) {\n  const extent = createOrUpdateEmpty(opt_extent);\n  return extendCoordinates(extent, coordinates);\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {Extent=} opt_extent Extent.\n * @return {Extent} Extent.\n */\nexport function createOrUpdateFromFlatCoordinates(flatCoordinates, offset, end, stride, opt_extent) {\n  const extent = createOrUpdateEmpty(opt_extent);\n  return extendFlatCoordinates(extent, flatCoordinates, offset, end, stride);\n}\n\n/**\n * @param {Array<Array<import(\"./coordinate.js\").Coordinate>>} rings Rings.\n * @param {Extent=} opt_extent Extent.\n * @return {Extent} Extent.\n */\nexport function createOrUpdateFromRings(rings, opt_extent) {\n  const extent = createOrUpdateEmpty(opt_extent);\n  return extendRings(extent, rings);\n}\n\n\n/**\n * Determine if two extents are equivalent.\n * @param {Extent} extent1 Extent 1.\n * @param {Extent} extent2 Extent 2.\n * @return {boolean} The two extents are equivalent.\n * @api\n */\nexport function equals(extent1, extent2) {\n  return extent1[0] == extent2[0] && extent1[2] == extent2[2] &&\n      extent1[1] == extent2[1] && extent1[3] == extent2[3];\n}\n\n\n/**\n * Modify an extent to include another extent.\n * @param {Extent} extent1 The extent to be modified.\n * @param {Extent} extent2 The extent that will be included in the first.\n * @return {Extent} A reference to the first (extended) extent.\n * @api\n */\nexport function extend(extent1, extent2) {\n  if (extent2[0] < extent1[0]) {\n    extent1[0] = extent2[0];\n  }\n  if (extent2[2] > extent1[2]) {\n    extent1[2] = extent2[2];\n  }\n  if (extent2[1] < extent1[1]) {\n    extent1[1] = extent2[1];\n  }\n  if (extent2[3] > extent1[3]) {\n    extent1[3] = extent2[3];\n  }\n  return extent1;\n}\n\n\n/**\n * @param {Extent} extent Extent.\n * @param {import(\"./coordinate.js\").Coordinate} coordinate Coordinate.\n */\nexport function extendCoordinate(extent, coordinate) {\n  if (coordinate[0] < extent[0]) {\n    extent[0] = coordinate[0];\n  }\n  if (coordinate[0] > extent[2]) {\n    extent[2] = coordinate[0];\n  }\n  if (coordinate[1] < extent[1]) {\n    extent[1] = coordinate[1];\n  }\n  if (coordinate[1] > extent[3]) {\n    extent[3] = coordinate[1];\n  }\n}\n\n\n/**\n * @param {Extent} extent Extent.\n * @param {Array<import(\"./coordinate.js\").Coordinate>} coordinates Coordinates.\n * @return {Extent} Extent.\n */\nexport function extendCoordinates(extent, coordinates) {\n  for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n    extendCoordinate(extent, coordinates[i]);\n  }\n  return extent;\n}\n\n\n/**\n * @param {Extent} extent Extent.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {Extent} Extent.\n */\nexport function extendFlatCoordinates(extent, flatCoordinates, offset, end, stride) {\n  for (; offset < end; offset += stride) {\n    extendXY(extent, flatCoordinates[offset], flatCoordinates[offset + 1]);\n  }\n  return extent;\n}\n\n\n/**\n * @param {Extent} extent Extent.\n * @param {Array<Array<import(\"./coordinate.js\").Coordinate>>} rings Rings.\n * @return {Extent} Extent.\n */\nexport function extendRings(extent, rings) {\n  for (let i = 0, ii = rings.length; i < ii; ++i) {\n    extendCoordinates(extent, rings[i]);\n  }\n  return extent;\n}\n\n\n/**\n * @param {Extent} extent Extent.\n * @param {number} x X.\n * @param {number} y Y.\n */\nexport function extendXY(extent, x, y) {\n  extent[0] = Math.min(extent[0], x);\n  extent[1] = Math.min(extent[1], y);\n  extent[2] = Math.max(extent[2], x);\n  extent[3] = Math.max(extent[3], y);\n}\n\n\n/**\n * This function calls `callback` for each corner of the extent. If the\n * callback returns a truthy value the function returns that value\n * immediately. Otherwise the function returns `false`.\n * @param {Extent} extent Extent.\n * @param {function(this:T, import(\"./coordinate.js\").Coordinate): S} callback Callback.\n * @param {T=} opt_this Value to use as `this` when executing `callback`.\n * @return {S|boolean} Value.\n * @template S, T\n */\nexport function forEachCorner(extent, callback, opt_this) {\n  let val;\n  val = callback.call(opt_this, getBottomLeft(extent));\n  if (val) {\n    return val;\n  }\n  val = callback.call(opt_this, getBottomRight(extent));\n  if (val) {\n    return val;\n  }\n  val = callback.call(opt_this, getTopRight(extent));\n  if (val) {\n    return val;\n  }\n  val = callback.call(opt_this, getTopLeft(extent));\n  if (val) {\n    return val;\n  }\n  return false;\n}\n\n\n/**\n * Get the size of an extent.\n * @param {Extent} extent Extent.\n * @return {number} Area.\n * @api\n */\nexport function getArea(extent) {\n  let area = 0;\n  if (!isEmpty(extent)) {\n    area = getWidth(extent) * getHeight(extent);\n  }\n  return area;\n}\n\n\n/**\n * Get the bottom left coordinate of an extent.\n * @param {Extent} extent Extent.\n * @return {import(\"./coordinate.js\").Coordinate} Bottom left coordinate.\n * @api\n */\nexport function getBottomLeft(extent) {\n  return [extent[0], extent[1]];\n}\n\n\n/**\n * Get the bottom right coordinate of an extent.\n * @param {Extent} extent Extent.\n * @return {import(\"./coordinate.js\").Coordinate} Bottom right coordinate.\n * @api\n */\nexport function getBottomRight(extent) {\n  return [extent[2], extent[1]];\n}\n\n\n/**\n * Get the center coordinate of an extent.\n * @param {Extent} extent Extent.\n * @return {import(\"./coordinate.js\").Coordinate} Center.\n * @api\n */\nexport function getCenter(extent) {\n  return [(extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2];\n}\n\n\n/**\n * Get a corner coordinate of an extent.\n * @param {Extent} extent Extent.\n * @param {Corner} corner Corner.\n * @return {import(\"./coordinate.js\").Coordinate} Corner coordinate.\n */\nexport function getCorner(extent, corner) {\n  let coordinate;\n  if (corner === Corner.BOTTOM_LEFT) {\n    coordinate = getBottomLeft(extent);\n  } else if (corner === Corner.BOTTOM_RIGHT) {\n    coordinate = getBottomRight(extent);\n  } else if (corner === Corner.TOP_LEFT) {\n    coordinate = getTopLeft(extent);\n  } else if (corner === Corner.TOP_RIGHT) {\n    coordinate = getTopRight(extent);\n  } else {\n    assert(false, 13); // Invalid corner\n  }\n  return coordinate;\n}\n\n\n/**\n * @param {Extent} extent1 Extent 1.\n * @param {Extent} extent2 Extent 2.\n * @return {number} Enlarged area.\n */\nexport function getEnlargedArea(extent1, extent2) {\n  const minX = Math.min(extent1[0], extent2[0]);\n  const minY = Math.min(extent1[1], extent2[1]);\n  const maxX = Math.max(extent1[2], extent2[2]);\n  const maxY = Math.max(extent1[3], extent2[3]);\n  return (maxX - minX) * (maxY - minY);\n}\n\n\n/**\n * @param {import(\"./coordinate.js\").Coordinate} center Center.\n * @param {number} resolution Resolution.\n * @param {number} rotation Rotation.\n * @param {import(\"./size.js\").Size} size Size.\n * @param {Extent=} opt_extent Destination extent.\n * @return {Extent} Extent.\n */\nexport function getForViewAndSize(center, resolution, rotation, size, opt_extent) {\n  const dx = resolution * size[0] / 2;\n  const dy = resolution * size[1] / 2;\n  const cosRotation = Math.cos(rotation);\n  const sinRotation = Math.sin(rotation);\n  const xCos = dx * cosRotation;\n  const xSin = dx * sinRotation;\n  const yCos = dy * cosRotation;\n  const ySin = dy * sinRotation;\n  const x = center[0];\n  const y = center[1];\n  const x0 = x - xCos + ySin;\n  const x1 = x - xCos - ySin;\n  const x2 = x + xCos - ySin;\n  const x3 = x + xCos + ySin;\n  const y0 = y - xSin - yCos;\n  const y1 = y - xSin + yCos;\n  const y2 = y + xSin + yCos;\n  const y3 = y + xSin - yCos;\n  return createOrUpdate(\n    Math.min(x0, x1, x2, x3), Math.min(y0, y1, y2, y3),\n    Math.max(x0, x1, x2, x3), Math.max(y0, y1, y2, y3),\n    opt_extent);\n}\n\n\n/**\n * Get the height of an extent.\n * @param {Extent} extent Extent.\n * @return {number} Height.\n * @api\n */\nexport function getHeight(extent) {\n  return extent[3] - extent[1];\n}\n\n\n/**\n * @param {Extent} extent1 Extent 1.\n * @param {Extent} extent2 Extent 2.\n * @return {number} Intersection area.\n */\nexport function getIntersectionArea(extent1, extent2) {\n  const intersection = getIntersection(extent1, extent2);\n  return getArea(intersection);\n}\n\n\n/**\n * Get the intersection of two extents.\n * @param {Extent} extent1 Extent 1.\n * @param {Extent} extent2 Extent 2.\n * @param {Extent=} opt_extent Optional extent to populate with intersection.\n * @return {Extent} Intersecting extent.\n * @api\n */\nexport function getIntersection(extent1, extent2, opt_extent) {\n  const intersection = opt_extent ? opt_extent : createEmpty();\n  if (intersects(extent1, extent2)) {\n    if (extent1[0] > extent2[0]) {\n      intersection[0] = extent1[0];\n    } else {\n      intersection[0] = extent2[0];\n    }\n    if (extent1[1] > extent2[1]) {\n      intersection[1] = extent1[1];\n    } else {\n      intersection[1] = extent2[1];\n    }\n    if (extent1[2] < extent2[2]) {\n      intersection[2] = extent1[2];\n    } else {\n      intersection[2] = extent2[2];\n    }\n    if (extent1[3] < extent2[3]) {\n      intersection[3] = extent1[3];\n    } else {\n      intersection[3] = extent2[3];\n    }\n  } else {\n    createOrUpdateEmpty(intersection);\n  }\n  return intersection;\n}\n\n\n/**\n * @param {Extent} extent Extent.\n * @return {number} Margin.\n */\nexport function getMargin(extent) {\n  return getWidth(extent) + getHeight(extent);\n}\n\n\n/**\n * Get the size (width, height) of an extent.\n * @param {Extent} extent The extent.\n * @return {import(\"./size.js\").Size} The extent size.\n * @api\n */\nexport function getSize(extent) {\n  return [extent[2] - extent[0], extent[3] - extent[1]];\n}\n\n\n/**\n * Get the top left coordinate of an extent.\n * @param {Extent} extent Extent.\n * @return {import(\"./coordinate.js\").Coordinate} Top left coordinate.\n * @api\n */\nexport function getTopLeft(extent) {\n  return [extent[0], extent[3]];\n}\n\n\n/**\n * Get the top right coordinate of an extent.\n * @param {Extent} extent Extent.\n * @return {import(\"./coordinate.js\").Coordinate} Top right coordinate.\n * @api\n */\nexport function getTopRight(extent) {\n  return [extent[2], extent[3]];\n}\n\n\n/**\n * Get the width of an extent.\n * @param {Extent} extent Extent.\n * @return {number} Width.\n * @api\n */\nexport function getWidth(extent) {\n  return extent[2] - extent[0];\n}\n\n\n/**\n * Determine if one extent intersects another.\n * @param {Extent} extent1 Extent 1.\n * @param {Extent} extent2 Extent.\n * @return {boolean} The two extents intersect.\n * @api\n */\nexport function intersects(extent1, extent2) {\n  return extent1[0] <= extent2[2] &&\n      extent1[2] >= extent2[0] &&\n      extent1[1] <= extent2[3] &&\n      extent1[3] >= extent2[1];\n}\n\n\n/**\n * Determine if an extent is empty.\n * @param {Extent} extent Extent.\n * @return {boolean} Is empty.\n * @api\n */\nexport function isEmpty(extent) {\n  return extent[2] < extent[0] || extent[3] < extent[1];\n}\n\n\n/**\n * @param {Extent} extent Extent.\n * @param {Extent=} opt_extent Extent.\n * @return {Extent} Extent.\n */\nexport function returnOrUpdate(extent, opt_extent) {\n  if (opt_extent) {\n    opt_extent[0] = extent[0];\n    opt_extent[1] = extent[1];\n    opt_extent[2] = extent[2];\n    opt_extent[3] = extent[3];\n    return opt_extent;\n  } else {\n    return extent;\n  }\n}\n\n\n/**\n * @param {Extent} extent Extent.\n * @param {number} value Value.\n */\nexport function scaleFromCenter(extent, value) {\n  const deltaX = ((extent[2] - extent[0]) / 2) * (value - 1);\n  const deltaY = ((extent[3] - extent[1]) / 2) * (value - 1);\n  extent[0] -= deltaX;\n  extent[2] += deltaX;\n  extent[1] -= deltaY;\n  extent[3] += deltaY;\n}\n\n\n/**\n * Determine if the segment between two coordinates intersects (crosses,\n * touches, or is contained by) the provided extent.\n * @param {Extent} extent The extent.\n * @param {import(\"./coordinate.js\").Coordinate} start Segment start coordinate.\n * @param {import(\"./coordinate.js\").Coordinate} end Segment end coordinate.\n * @return {boolean} The segment intersects the extent.\n */\nexport function intersectsSegment(extent, start, end) {\n  let intersects = false;\n  const startRel = coordinateRelationship(extent, start);\n  const endRel = coordinateRelationship(extent, end);\n  if (startRel === Relationship.INTERSECTING ||\n      endRel === Relationship.INTERSECTING) {\n    intersects = true;\n  } else {\n    const minX = extent[0];\n    const minY = extent[1];\n    const maxX = extent[2];\n    const maxY = extent[3];\n    const startX = start[0];\n    const startY = start[1];\n    const endX = end[0];\n    const endY = end[1];\n    const slope = (endY - startY) / (endX - startX);\n    let x, y;\n    if (!!(endRel & Relationship.ABOVE) &&\n        !(startRel & Relationship.ABOVE)) {\n      // potentially intersects top\n      x = endX - ((endY - maxY) / slope);\n      intersects = x >= minX && x <= maxX;\n    }\n    if (!intersects && !!(endRel & Relationship.RIGHT) &&\n        !(startRel & Relationship.RIGHT)) {\n      // potentially intersects right\n      y = endY - ((endX - maxX) * slope);\n      intersects = y >= minY && y <= maxY;\n    }\n    if (!intersects && !!(endRel & Relationship.BELOW) &&\n        !(startRel & Relationship.BELOW)) {\n      // potentially intersects bottom\n      x = endX - ((endY - minY) / slope);\n      intersects = x >= minX && x <= maxX;\n    }\n    if (!intersects && !!(endRel & Relationship.LEFT) &&\n        !(startRel & Relationship.LEFT)) {\n      // potentially intersects left\n      y = endY - ((endX - minX) * slope);\n      intersects = y >= minY && y <= maxY;\n    }\n\n  }\n  return intersects;\n}\n\n\n/**\n * Apply a transform function to the extent.\n * @param {Extent} extent Extent.\n * @param {import(\"./proj.js\").TransformFunction} transformFn Transform function.\n * Called with `[minX, minY, maxX, maxY]` extent coordinates.\n * @param {Extent=} opt_extent Destination extent.\n * @return {Extent} Extent.\n * @api\n */\nexport function applyTransform(extent, transformFn, opt_extent) {\n  const coordinates = [\n    extent[0], extent[1],\n    extent[0], extent[3],\n    extent[2], extent[1],\n    extent[2], extent[3]\n  ];\n  transformFn(coordinates, coordinates, 2);\n  const xs = [coordinates[0], coordinates[2], coordinates[4], coordinates[6]];\n  const ys = [coordinates[1], coordinates[3], coordinates[5], coordinates[7]];\n  return _boundingExtentXYs(xs, ys, opt_extent);\n}\n","/**\n * @module ol/geom/GeometryType\n */\n\n/**\n * The geometry type. One of `'Point'`, `'LineString'`, `'LinearRing'`,\n * `'Polygon'`, `'MultiPoint'`, `'MultiLineString'`, `'MultiPolygon'`,\n * `'GeometryCollection'`, `'Circle'`.\n * @enum {string}\n */\nexport default {\n  POINT: 'Point',\n  LINE_STRING: 'LineString',\n  LINEAR_RING: 'LinearRing',\n  POLYGON: 'Polygon',\n  MULTI_POINT: 'MultiPoint',\n  MULTI_LINE_STRING: 'MultiLineString',\n  MULTI_POLYGON: 'MultiPolygon',\n  GEOMETRY_COLLECTION: 'GeometryCollection',\n  CIRCLE: 'Circle'\n};\n","/**\n * @module ol/geom/GeometryLayout\n */\n\n/**\n * The coordinate layout for geometries, indicating whether a 3rd or 4th z ('Z')\n * or measure ('M') coordinate is available. Supported values are `'XY'`,\n * `'XYZ'`, `'XYM'`, `'XYZM'`.\n * @enum {string}\n */\nexport default {\n  XY: 'XY',\n  XYZ: 'XYZ',\n  XYM: 'XYM',\n  XYZM: 'XYZM'\n};\n","/**\n * @module ol/geom/flat/transform\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {import(\"../../transform.js\").Transform} transform Transform.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Transformed coordinates.\n */\nexport function transform2D(flatCoordinates, offset, end, stride, transform, opt_dest) {\n  const dest = opt_dest ? opt_dest : [];\n  let i = 0;\n  for (let j = offset; j < end; j += stride) {\n    const x = flatCoordinates[j];\n    const y = flatCoordinates[j + 1];\n    dest[i++] = transform[0] * x + transform[2] * y + transform[4];\n    dest[i++] = transform[1] * x + transform[3] * y + transform[5];\n  }\n  if (opt_dest && dest.length != i) {\n    dest.length = i;\n  }\n  return dest;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} angle Angle.\n * @param {Array<number>} anchor Rotation anchor point.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Transformed coordinates.\n */\nexport function rotate(flatCoordinates, offset, end, stride, angle, anchor, opt_dest) {\n  const dest = opt_dest ? opt_dest : [];\n  const cos = Math.cos(angle);\n  const sin = Math.sin(angle);\n  const anchorX = anchor[0];\n  const anchorY = anchor[1];\n  let i = 0;\n  for (let j = offset; j < end; j += stride) {\n    const deltaX = flatCoordinates[j] - anchorX;\n    const deltaY = flatCoordinates[j + 1] - anchorY;\n    dest[i++] = anchorX + deltaX * cos - deltaY * sin;\n    dest[i++] = anchorY + deltaX * sin + deltaY * cos;\n    for (let k = j + 2; k < j + stride; ++k) {\n      dest[i++] = flatCoordinates[k];\n    }\n  }\n  if (opt_dest && dest.length != i) {\n    dest.length = i;\n  }\n  return dest;\n}\n\n\n/**\n * Scale the coordinates.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} sx Scale factor in the x-direction.\n * @param {number} sy Scale factor in the y-direction.\n * @param {Array<number>} anchor Scale anchor point.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Transformed coordinates.\n */\nexport function scale(flatCoordinates, offset, end, stride, sx, sy, anchor, opt_dest) {\n  const dest = opt_dest ? opt_dest : [];\n  const anchorX = anchor[0];\n  const anchorY = anchor[1];\n  let i = 0;\n  for (let j = offset; j < end; j += stride) {\n    const deltaX = flatCoordinates[j] - anchorX;\n    const deltaY = flatCoordinates[j + 1] - anchorY;\n    dest[i++] = anchorX + sx * deltaX;\n    dest[i++] = anchorY + sy * deltaY;\n    for (let k = j + 2; k < j + stride; ++k) {\n      dest[i++] = flatCoordinates[k];\n    }\n  }\n  if (opt_dest && dest.length != i) {\n    dest.length = i;\n  }\n  return dest;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} deltaX Delta X.\n * @param {number} deltaY Delta Y.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Transformed coordinates.\n */\nexport function translate(flatCoordinates, offset, end, stride, deltaX, deltaY, opt_dest) {\n  const dest = opt_dest ? opt_dest : [];\n  let i = 0;\n  for (let j = offset; j < end; j += stride) {\n    dest[i++] = flatCoordinates[j] + deltaX;\n    dest[i++] = flatCoordinates[j + 1] + deltaY;\n    for (let k = j + 2; k < j + stride; ++k) {\n      dest[i++] = flatCoordinates[k];\n    }\n  }\n  if (opt_dest && dest.length != i) {\n    dest.length = i;\n  }\n  return dest;\n}\n","/**\n * @license\n * Latitude/longitude spherical geodesy formulae taken from\n * http://www.movable-type.co.uk/scripts/latlong.html\n * Licensed under CC-BY-3.0.\n */\n\n/**\n * @module ol/sphere\n */\nimport {toRadians, toDegrees} from './math.js';\nimport GeometryType from './geom/GeometryType.js';\n\n\n/**\n * Object literal with options for the {@link getLength} or {@link getArea}\n * functions.\n * @typedef {Object} SphereMetricOptions\n * @property {import(\"./proj.js\").ProjectionLike} [projection='EPSG:3857']\n * Projection of the  geometry.  By default, the geometry is assumed to be in\n * Web Mercator.\n * @property {number} [radius=6371008.8] Sphere radius.  By default, the radius of the\n * earth is used (Clarke 1866 Authalic Sphere).\n */\n\n\n/**\n * The mean Earth radius (1/3 * (2a + b)) for the WGS84 ellipsoid.\n * https://en.wikipedia.org/wiki/Earth_radius#Mean_radius\n * @type {number}\n */\nexport const DEFAULT_RADIUS = 6371008.8;\n\n\n/**\n * Get the great circle distance (in meters) between two geographic coordinates.\n * @param {Array} c1 Starting coordinate.\n * @param {Array} c2 Ending coordinate.\n * @param {number=} opt_radius The sphere radius to use.  Defaults to the Earth's\n *     mean radius using the WGS84 ellipsoid.\n * @return {number} The great circle distance between the points (in meters).\n * @api\n */\nexport function getDistance(c1, c2, opt_radius) {\n  const radius = opt_radius || DEFAULT_RADIUS;\n  const lat1 = toRadians(c1[1]);\n  const lat2 = toRadians(c2[1]);\n  const deltaLatBy2 = (lat2 - lat1) / 2;\n  const deltaLonBy2 = toRadians(c2[0] - c1[0]) / 2;\n  const a = Math.sin(deltaLatBy2) * Math.sin(deltaLatBy2) +\n      Math.sin(deltaLonBy2) * Math.sin(deltaLonBy2) *\n      Math.cos(lat1) * Math.cos(lat2);\n  return 2 * radius * Math.atan2(Math.sqrt(a), Math.sqrt(1 - a));\n}\n\n\n/**\n * Get the cumulative great circle length of linestring coordinates (geographic).\n * @param {Array} coordinates Linestring coordinates.\n * @param {number} radius The sphere radius to use.\n * @return {number} The length (in meters).\n */\nfunction getLengthInternal(coordinates, radius) {\n  let length = 0;\n  for (let i = 0, ii = coordinates.length; i < ii - 1; ++i) {\n    length += getDistance(coordinates[i], coordinates[i + 1], radius);\n  }\n  return length;\n}\n\n\n/**\n * Get the spherical length of a geometry.  This length is the sum of the\n * great circle distances between coordinates.  For polygons, the length is\n * the sum of all rings.  For points, the length is zero.  For multi-part\n * geometries, the length is the sum of the length of each part.\n * @param {import(\"./geom/Geometry.js\").default} geometry A geometry.\n * @param {SphereMetricOptions=} opt_options Options for the\n * length calculation.  By default, geometries are assumed to be in 'EPSG:3857'.\n * You can change this by providing a `projection` option.\n * @return {number} The spherical length (in meters).\n * @api\n */\nexport function getLength(geometry, opt_options) {\n  const options = opt_options || {};\n  const radius = options.radius || DEFAULT_RADIUS;\n  const projection = options.projection || 'EPSG:3857';\n  const type = geometry.getType();\n  if (type !== GeometryType.GEOMETRY_COLLECTION) {\n    geometry = geometry.clone().transform(projection, 'EPSG:4326');\n  }\n  let length = 0;\n  let coordinates, coords, i, ii, j, jj;\n  switch (type) {\n    case GeometryType.POINT:\n    case GeometryType.MULTI_POINT: {\n      break;\n    }\n    case GeometryType.LINE_STRING:\n    case GeometryType.LINEAR_RING: {\n      coordinates = /** @type {import(\"./geom/SimpleGeometry.js\").default} */ (geometry).getCoordinates();\n      length = getLengthInternal(coordinates, radius);\n      break;\n    }\n    case GeometryType.MULTI_LINE_STRING:\n    case GeometryType.POLYGON: {\n      coordinates = /** @type {import(\"./geom/SimpleGeometry.js\").default} */ (geometry).getCoordinates();\n      for (i = 0, ii = coordinates.length; i < ii; ++i) {\n        length += getLengthInternal(coordinates[i], radius);\n      }\n      break;\n    }\n    case GeometryType.MULTI_POLYGON: {\n      coordinates = /** @type {import(\"./geom/SimpleGeometry.js\").default} */ (geometry).getCoordinates();\n      for (i = 0, ii = coordinates.length; i < ii; ++i) {\n        coords = coordinates[i];\n        for (j = 0, jj = coords.length; j < jj; ++j) {\n          length += getLengthInternal(coords[j], radius);\n        }\n      }\n      break;\n    }\n    case GeometryType.GEOMETRY_COLLECTION: {\n      const geometries = /** @type {import(\"./geom/GeometryCollection.js\").default} */ (geometry).getGeometries();\n      for (i = 0, ii = geometries.length; i < ii; ++i) {\n        length += getLength(geometries[i], opt_options);\n      }\n      break;\n    }\n    default: {\n      throw new Error('Unsupported geometry type: ' + type);\n    }\n  }\n  return length;\n}\n\n\n/**\n * Returns the spherical area for a list of coordinates.\n *\n * [Reference](https://trs-new.jpl.nasa.gov/handle/2014/40409)\n * Robert. G. Chamberlain and William H. Duquette, \"Some Algorithms for\n * Polygons on a Sphere\", JPL Publication 07-03, Jet Propulsion\n * Laboratory, Pasadena, CA, June 2007\n *\n * @param {Array<import(\"./coordinate.js\").Coordinate>} coordinates List of coordinates of a linear\n * ring. If the ring is oriented clockwise, the area will be positive,\n * otherwise it will be negative.\n * @param {number} radius The sphere radius.\n * @return {number} Area (in square meters).\n */\nfunction getAreaInternal(coordinates, radius) {\n  let area = 0;\n  const len = coordinates.length;\n  let x1 = coordinates[len - 1][0];\n  let y1 = coordinates[len - 1][1];\n  for (let i = 0; i < len; i++) {\n    const x2 = coordinates[i][0];\n    const y2 = coordinates[i][1];\n    area += toRadians(x2 - x1) *\n        (2 + Math.sin(toRadians(y1)) +\n        Math.sin(toRadians(y2)));\n    x1 = x2;\n    y1 = y2;\n  }\n  return area * radius * radius / 2.0;\n}\n\n\n/**\n * Get the spherical area of a geometry.  This is the area (in meters) assuming\n * that polygon edges are segments of great circles on a sphere.\n * @param {import(\"./geom/Geometry.js\").default} geometry A geometry.\n * @param {SphereMetricOptions=} opt_options Options for the area\n *     calculation.  By default, geometries are assumed to be in 'EPSG:3857'.\n *     You can change this by providing a `projection` option.\n * @return {number} The spherical area (in square meters).\n * @api\n */\nexport function getArea(geometry, opt_options) {\n  const options = opt_options || {};\n  const radius = options.radius || DEFAULT_RADIUS;\n  const projection = options.projection || 'EPSG:3857';\n  const type = geometry.getType();\n  if (type !== GeometryType.GEOMETRY_COLLECTION) {\n    geometry = geometry.clone().transform(projection, 'EPSG:4326');\n  }\n  let area = 0;\n  let coordinates, coords, i, ii, j, jj;\n  switch (type) {\n    case GeometryType.POINT:\n    case GeometryType.MULTI_POINT:\n    case GeometryType.LINE_STRING:\n    case GeometryType.MULTI_LINE_STRING:\n    case GeometryType.LINEAR_RING: {\n      break;\n    }\n    case GeometryType.POLYGON: {\n      coordinates = /** @type {import(\"./geom/Polygon.js\").default} */ (geometry).getCoordinates();\n      area = Math.abs(getAreaInternal(coordinates[0], radius));\n      for (i = 1, ii = coordinates.length; i < ii; ++i) {\n        area -= Math.abs(getAreaInternal(coordinates[i], radius));\n      }\n      break;\n    }\n    case GeometryType.MULTI_POLYGON: {\n      coordinates = /** @type {import(\"./geom/SimpleGeometry.js\").default} */ (geometry).getCoordinates();\n      for (i = 0, ii = coordinates.length; i < ii; ++i) {\n        coords = coordinates[i];\n        area += Math.abs(getAreaInternal(coords[0], radius));\n        for (j = 1, jj = coords.length; j < jj; ++j) {\n          area -= Math.abs(getAreaInternal(coords[j], radius));\n        }\n      }\n      break;\n    }\n    case GeometryType.GEOMETRY_COLLECTION: {\n      const geometries = /** @type {import(\"./geom/GeometryCollection.js\").default} */ (geometry).getGeometries();\n      for (i = 0, ii = geometries.length; i < ii; ++i) {\n        area += getArea(geometries[i], opt_options);\n      }\n      break;\n    }\n    default: {\n      throw new Error('Unsupported geometry type: ' + type);\n    }\n  }\n  return area;\n}\n\n\n/**\n * Returns the coordinate at the given distance and bearing from `c1`.\n *\n * @param {import(\"./coordinate.js\").Coordinate} c1 The origin point (`[lon, lat]` in degrees).\n * @param {number} distance The great-circle distance between the origin\n *     point and the target point.\n * @param {number} bearing The bearing (in radians).\n * @param {number=} opt_radius The sphere radius to use.  Defaults to the Earth's\n *     mean radius using the WGS84 ellipsoid.\n * @return {import(\"./coordinate.js\").Coordinate} The target point.\n */\nexport function offset(c1, distance, bearing, opt_radius) {\n  const radius = opt_radius || DEFAULT_RADIUS;\n  const lat1 = toRadians(c1[1]);\n  const lon1 = toRadians(c1[0]);\n  const dByR = distance / radius;\n  const lat = Math.asin(\n    Math.sin(lat1) * Math.cos(dByR) +\n      Math.cos(lat1) * Math.sin(dByR) * Math.cos(bearing));\n  const lon = lon1 + Math.atan2(\n    Math.sin(bearing) * Math.sin(dByR) * Math.cos(lat1),\n    Math.cos(dByR) - Math.sin(lat1) * Math.sin(lat));\n  return [toDegrees(lon), toDegrees(lat)];\n}\n","/**\n * @module ol/proj/Units\n */\n\n/**\n * Projection units: `'degrees'`, `'ft'`, `'m'`, `'pixels'`, `'tile-pixels'` or\n * `'us-ft'`.\n * @enum {string}\n */\nconst Units = {\n  DEGREES: 'degrees',\n  FEET: 'ft',\n  METERS: 'm',\n  PIXELS: 'pixels',\n  TILE_PIXELS: 'tile-pixels',\n  USFEET: 'us-ft'\n};\n\n\n/**\n * Meters per unit lookup table.\n * @const\n * @type {Object<Units, number>}\n * @api\n */\nexport const METERS_PER_UNIT = {};\n// use the radius of the Normal sphere\nMETERS_PER_UNIT[Units.DEGREES] = 2 * Math.PI * 6370997 / 360;\nMETERS_PER_UNIT[Units.FEET] = 0.3048;\nMETERS_PER_UNIT[Units.METERS] = 1;\nMETERS_PER_UNIT[Units.USFEET] = 1200 / 3937;\n\nexport default Units;\n","/**\n * @module ol/proj/Projection\n */\nimport {METERS_PER_UNIT} from './Units.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {string} code The SRS identifier code, e.g. `EPSG:4326`.\n * @property {import(\"./Units.js\").default|string} [units] Units. Required unless a\n * proj4 projection is defined for `code`.\n * @property {import(\"../extent.js\").Extent} [extent] The validity extent for the SRS.\n * @property {string} [axisOrientation='enu'] The axis orientation as specified in Proj4.\n * @property {boolean} [global=false] Whether the projection is valid for the whole globe.\n * @property {number} [metersPerUnit] The meters per unit for the SRS.\n * If not provided, the `units` are used to get the meters per unit from the {@link module:ol/proj/Units~METERS_PER_UNIT}\n * lookup table.\n * @property {import(\"../extent.js\").Extent} [worldExtent] The world extent for the SRS.\n * @property {function(number, import(\"../coordinate.js\").Coordinate):number} [getPointResolution]\n * Function to determine resolution at a point. The function is called with a\n * `{number}` view resolution and an `{import(\"../coordinate.js\").Coordinate}` as arguments, and returns\n * the `{number}` resolution at the passed coordinate. If this is `undefined`,\n * the default {@link module:ol/proj#getPointResolution} function will be used.\n */\n\n\n/**\n * @classdesc\n * Projection definition class. One of these is created for each projection\n * supported in the application and stored in the {@link module:ol/proj} namespace.\n * You can use these in applications, but this is not required, as API params\n * and options use {@link module:ol/proj~ProjectionLike} which means the simple string\n * code will suffice.\n *\n * You can use {@link module:ol/proj~get} to retrieve the object for a particular\n * projection.\n *\n * The library includes definitions for `EPSG:4326` and `EPSG:3857`, together\n * with the following aliases:\n * * `EPSG:4326`: CRS:84, urn:ogc:def:crs:EPSG:6.6:4326,\n *     urn:ogc:def:crs:OGC:1.3:CRS84, urn:ogc:def:crs:OGC:2:84,\n *     http://www.opengis.net/gml/srs/epsg.xml#4326,\n *     urn:x-ogc:def:crs:EPSG:4326\n * * `EPSG:3857`: EPSG:102100, EPSG:102113, EPSG:900913,\n *     urn:ogc:def:crs:EPSG:6.18:3:3857,\n *     http://www.opengis.net/gml/srs/epsg.xml#3857\n *\n * If you use [proj4js](https://github.com/proj4js/proj4js), aliases can\n * be added using `proj4.defs()`. After all required projection definitions are\n * added, call the {@link module:ol/proj/proj4~register} function.\n *\n * @api\n */\nclass Projection {\n\n  /**\n   * @param {Options} options Projection options.\n   */\n  constructor(options) {\n    /**\n     * @private\n     * @type {string}\n     */\n    this.code_ = options.code;\n\n    /**\n     * Units of projected coordinates. When set to `TILE_PIXELS`, a\n     * `this.extent_` and `this.worldExtent_` must be configured properly for each\n     * tile.\n     * @private\n     * @type {import(\"./Units.js\").default}\n     */\n    this.units_ = /** @type {import(\"./Units.js\").default} */ (options.units);\n\n    /**\n     * Validity extent of the projection in projected coordinates. For projections\n     * with `TILE_PIXELS` units, this is the extent of the tile in\n     * tile pixel space.\n     * @private\n     * @type {import(\"../extent.js\").Extent}\n     */\n    this.extent_ = options.extent !== undefined ? options.extent : null;\n\n    /**\n     * Extent of the world in EPSG:4326. For projections with\n     * `TILE_PIXELS` units, this is the extent of the tile in\n     * projected coordinate space.\n     * @private\n     * @type {import(\"../extent.js\").Extent}\n     */\n    this.worldExtent_ = options.worldExtent !== undefined ?\n      options.worldExtent : null;\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.axisOrientation_ = options.axisOrientation !== undefined ?\n      options.axisOrientation : 'enu';\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.global_ = options.global !== undefined ? options.global : false;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.canWrapX_ = !!(this.global_ && this.extent_);\n\n    /**\n     * @private\n     * @type {function(number, import(\"../coordinate.js\").Coordinate):number|undefined}\n     */\n    this.getPointResolutionFunc_ = options.getPointResolution;\n\n    /**\n     * @private\n     * @type {import(\"../tilegrid/TileGrid.js\").default}\n     */\n    this.defaultTileGrid_ = null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.metersPerUnit_ = options.metersPerUnit;\n  }\n\n  /**\n   * @return {boolean} The projection is suitable for wrapping the x-axis\n   */\n  canWrapX() {\n    return this.canWrapX_;\n  }\n\n  /**\n   * Get the code for this projection, e.g. 'EPSG:4326'.\n   * @return {string} Code.\n   * @api\n   */\n  getCode() {\n    return this.code_;\n  }\n\n  /**\n   * Get the validity extent for this projection.\n   * @return {import(\"../extent.js\").Extent} Extent.\n   * @api\n   */\n  getExtent() {\n    return this.extent_;\n  }\n\n  /**\n   * Get the units of this projection.\n   * @return {import(\"./Units.js\").default} Units.\n   * @api\n   */\n  getUnits() {\n    return this.units_;\n  }\n\n  /**\n   * Get the amount of meters per unit of this projection.  If the projection is\n   * not configured with `metersPerUnit` or a units identifier, the return is\n   * `undefined`.\n   * @return {number|undefined} Meters.\n   * @api\n   */\n  getMetersPerUnit() {\n    return this.metersPerUnit_ || METERS_PER_UNIT[this.units_];\n  }\n\n  /**\n   * Get the world extent for this projection.\n   * @return {import(\"../extent.js\").Extent} Extent.\n   * @api\n   */\n  getWorldExtent() {\n    return this.worldExtent_;\n  }\n\n  /**\n   * Get the axis orientation of this projection.\n   * Example values are:\n   * enu - the default easting, northing, elevation.\n   * neu - northing, easting, up - useful for \"lat/long\" geographic coordinates,\n   *     or south orientated transverse mercator.\n   * wnu - westing, northing, up - some planetary coordinate systems have\n   *     \"west positive\" coordinate systems\n   * @return {string} Axis orientation.\n   * @api\n   */\n  getAxisOrientation() {\n    return this.axisOrientation_;\n  }\n\n  /**\n   * Is this projection a global projection which spans the whole world?\n   * @return {boolean} Whether the projection is global.\n   * @api\n   */\n  isGlobal() {\n    return this.global_;\n  }\n\n  /**\n   * Set if the projection is a global projection which spans the whole world\n   * @param {boolean} global Whether the projection is global.\n   * @api\n   */\n  setGlobal(global) {\n    this.global_ = global;\n    this.canWrapX_ = !!(global && this.extent_);\n  }\n\n  /**\n   * @return {import(\"../tilegrid/TileGrid.js\").default} The default tile grid.\n   */\n  getDefaultTileGrid() {\n    return this.defaultTileGrid_;\n  }\n\n  /**\n   * @param {import(\"../tilegrid/TileGrid.js\").default} tileGrid The default tile grid.\n   */\n  setDefaultTileGrid(tileGrid) {\n    this.defaultTileGrid_ = tileGrid;\n  }\n\n  /**\n   * Set the validity extent for this projection.\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @api\n   */\n  setExtent(extent) {\n    this.extent_ = extent;\n    this.canWrapX_ = !!(this.global_ && extent);\n  }\n\n  /**\n   * Set the world extent for this projection.\n   * @param {import(\"../extent.js\").Extent} worldExtent World extent\n   *     [minlon, minlat, maxlon, maxlat].\n   * @api\n   */\n  setWorldExtent(worldExtent) {\n    this.worldExtent_ = worldExtent;\n  }\n\n  /**\n   * Set the getPointResolution function (see {@link module:ol/proj~getPointResolution}\n   * for this projection.\n   * @param {function(number, import(\"../coordinate.js\").Coordinate):number} func Function\n   * @api\n   */\n  setGetPointResolution(func) {\n    this.getPointResolutionFunc_ = func;\n  }\n\n  /**\n   * Get the custom point resolution function for this projection (if set).\n   * @return {function(number, import(\"../coordinate.js\").Coordinate):number|undefined} The custom point\n   * resolution function (if set).\n   */\n  getPointResolutionFunc() {\n    return this.getPointResolutionFunc_;\n  }\n}\n\nexport default Projection;\n","/**\n * @module ol/proj/epsg3857\n */\nimport {cosh} from '../math.js';\nimport Projection from './Projection.js';\nimport Units from './Units.js';\n\n\n/**\n * Radius of WGS84 sphere\n *\n * @const\n * @type {number}\n */\nexport const RADIUS = 6378137;\n\n\n/**\n * @const\n * @type {number}\n */\nexport const HALF_SIZE = Math.PI * RADIUS;\n\n\n/**\n * @const\n * @type {import(\"../extent.js\").Extent}\n */\nexport const EXTENT = [\n  -HALF_SIZE, -HALF_SIZE,\n  HALF_SIZE, HALF_SIZE\n];\n\n\n/**\n * @const\n * @type {import(\"../extent.js\").Extent}\n */\nexport const WORLD_EXTENT = [-180, -85, 180, 85];\n\n\n/**\n * @classdesc\n * Projection object for web/spherical Mercator (EPSG:3857).\n */\nclass EPSG3857Projection extends Projection {\n\n  /**\n   * @param {string} code Code.\n   */\n  constructor(code) {\n    super({\n      code: code,\n      units: Units.METERS,\n      extent: EXTENT,\n      global: true,\n      worldExtent: WORLD_EXTENT,\n      getPointResolution: function(resolution, point) {\n        return resolution / cosh(point[1] / RADIUS);\n      }\n    });\n\n  }\n\n}\n\n\n/**\n * Projections equal to EPSG:3857.\n *\n * @const\n * @type {Array<import(\"./Projection.js\").default>}\n */\nexport const PROJECTIONS = [\n  new EPSG3857Projection('EPSG:3857'),\n  new EPSG3857Projection('EPSG:102100'),\n  new EPSG3857Projection('EPSG:102113'),\n  new EPSG3857Projection('EPSG:900913'),\n  new EPSG3857Projection('urn:ogc:def:crs:EPSG:6.18:3:3857'),\n  new EPSG3857Projection('urn:ogc:def:crs:EPSG::3857'),\n  new EPSG3857Projection('http://www.opengis.net/gml/srs/epsg.xml#3857')\n];\n\n\n/**\n * Transformation from EPSG:4326 to EPSG:3857.\n *\n * @param {Array<number>} input Input array of coordinate values.\n * @param {Array<number>=} opt_output Output array of coordinate values.\n * @param {number=} opt_dimension Dimension (default is `2`).\n * @return {Array<number>} Output array of coordinate values.\n */\nexport function fromEPSG4326(input, opt_output, opt_dimension) {\n  const length = input.length;\n  const dimension = opt_dimension > 1 ? opt_dimension : 2;\n  let output = opt_output;\n  if (output === undefined) {\n    if (dimension > 2) {\n      // preserve values beyond second dimension\n      output = input.slice();\n    } else {\n      output = new Array(length);\n    }\n  }\n  const halfSize = HALF_SIZE;\n  for (let i = 0; i < length; i += dimension) {\n    output[i] = halfSize * input[i] / 180;\n    let y = RADIUS *\n        Math.log(Math.tan(Math.PI * (input[i + 1] + 90) / 360));\n    if (y > halfSize) {\n      y = halfSize;\n    } else if (y < -halfSize) {\n      y = -halfSize;\n    }\n    output[i + 1] = y;\n  }\n  return output;\n}\n\n\n/**\n * Transformation from EPSG:3857 to EPSG:4326.\n *\n * @param {Array<number>} input Input array of coordinate values.\n * @param {Array<number>=} opt_output Output array of coordinate values.\n * @param {number=} opt_dimension Dimension (default is `2`).\n * @return {Array<number>} Output array of coordinate values.\n */\nexport function toEPSG4326(input, opt_output, opt_dimension) {\n  const length = input.length;\n  const dimension = opt_dimension > 1 ? opt_dimension : 2;\n  let output = opt_output;\n  if (output === undefined) {\n    if (dimension > 2) {\n      // preserve values beyond second dimension\n      output = input.slice();\n    } else {\n      output = new Array(length);\n    }\n  }\n  for (let i = 0; i < length; i += dimension) {\n    output[i] = 180 * input[i] / HALF_SIZE;\n    output[i + 1] = 360 * Math.atan(\n      Math.exp(input[i + 1] / RADIUS)) / Math.PI - 90;\n  }\n  return output;\n}\n","/**\n * @module ol/proj/epsg4326\n */\nimport Projection from './Projection.js';\nimport Units from './Units.js';\n\n\n/**\n * Semi-major radius of the WGS84 ellipsoid.\n *\n * @const\n * @type {number}\n */\nexport const RADIUS = 6378137;\n\n\n/**\n * Extent of the EPSG:4326 projection which is the whole world.\n *\n * @const\n * @type {import(\"../extent.js\").Extent}\n */\nexport const EXTENT = [-180, -90, 180, 90];\n\n\n/**\n * @const\n * @type {number}\n */\nexport const METERS_PER_UNIT = Math.PI * RADIUS / 180;\n\n\n/**\n * @classdesc\n * Projection object for WGS84 geographic coordinates (EPSG:4326).\n *\n * Note that OpenLayers does not strictly comply with the EPSG definition.\n * The EPSG registry defines 4326 as a CRS for Latitude,Longitude (y,x).\n * OpenLayers treats EPSG:4326 as a pseudo-projection, with x,y coordinates.\n */\nclass EPSG4326Projection extends Projection {\n\n  /**\n   * @param {string} code Code.\n   * @param {string=} opt_axisOrientation Axis orientation.\n   */\n  constructor(code, opt_axisOrientation) {\n    super({\n      code: code,\n      units: Units.DEGREES,\n      extent: EXTENT,\n      axisOrientation: opt_axisOrientation,\n      global: true,\n      metersPerUnit: METERS_PER_UNIT,\n      worldExtent: EXTENT\n    });\n\n  }\n\n}\n\n\n/**\n * Projections equal to EPSG:4326.\n *\n * @const\n * @type {Array<import(\"./Projection.js\").default>}\n */\nexport const PROJECTIONS = [\n  new EPSG4326Projection('CRS:84'),\n  new EPSG4326Projection('EPSG:4326', 'neu'),\n  new EPSG4326Projection('urn:ogc:def:crs:EPSG::4326', 'neu'),\n  new EPSG4326Projection('urn:ogc:def:crs:EPSG:6.6:4326', 'neu'),\n  new EPSG4326Projection('urn:ogc:def:crs:OGC:1.3:CRS84'),\n  new EPSG4326Projection('urn:ogc:def:crs:OGC:2:84'),\n  new EPSG4326Projection('http://www.opengis.net/gml/srs/epsg.xml#4326', 'neu'),\n  new EPSG4326Projection('urn:x-ogc:def:crs:EPSG:4326', 'neu')\n];\n","/**\n * @module ol/proj/projections\n */\n\n\n/**\n * @type {Object<string, import(\"./Projection.js\").default>}\n */\nlet cache = {};\n\n\n/**\n * Clear the projections cache.\n */\nexport function clear() {\n  cache = {};\n}\n\n\n/**\n * Get a cached projection by code.\n * @param {string} code The code for the projection.\n * @return {import(\"./Projection.js\").default} The projection (if cached).\n */\nexport function get(code) {\n  return cache[code] || null;\n}\n\n\n/**\n * Add a projection to the cache.\n * @param {string} code The projection code.\n * @param {import(\"./Projection.js\").default} projection The projection to cache.\n */\nexport function add(code, projection) {\n  cache[code] = projection;\n}\n","/**\n * @module ol/proj/transforms\n */\nimport {isEmpty} from '../obj.js';\n\n\n/**\n * @private\n * @type {!Object<string, Object<string, import(\"../proj.js\").TransformFunction>>}\n */\nlet transforms = {};\n\n\n/**\n * Clear the transform cache.\n */\nexport function clear() {\n  transforms = {};\n}\n\n\n/**\n * Registers a conversion function to convert coordinates from the source\n * projection to the destination projection.\n *\n * @param {import(\"./Projection.js\").default} source Source.\n * @param {import(\"./Projection.js\").default} destination Destination.\n * @param {import(\"../proj.js\").TransformFunction} transformFn Transform.\n */\nexport function add(source, destination, transformFn) {\n  const sourceCode = source.getCode();\n  const destinationCode = destination.getCode();\n  if (!(sourceCode in transforms)) {\n    transforms[sourceCode] = {};\n  }\n  transforms[sourceCode][destinationCode] = transformFn;\n}\n\n\n/**\n * Unregisters the conversion function to convert coordinates from the source\n * projection to the destination projection.  This method is used to clean up\n * cached transforms during testing.\n *\n * @param {import(\"./Projection.js\").default} source Source projection.\n * @param {import(\"./Projection.js\").default} destination Destination projection.\n * @return {import(\"../proj.js\").TransformFunction} transformFn The unregistered transform.\n */\nexport function remove(source, destination) {\n  const sourceCode = source.getCode();\n  const destinationCode = destination.getCode();\n  const transform = transforms[sourceCode][destinationCode];\n  delete transforms[sourceCode][destinationCode];\n  if (isEmpty(transforms[sourceCode])) {\n    delete transforms[sourceCode];\n  }\n  return transform;\n}\n\n\n/**\n * Get a transform given a source code and a destination code.\n * @param {string} sourceCode The code for the source projection.\n * @param {string} destinationCode The code for the destination projection.\n * @return {import(\"../proj.js\").TransformFunction|undefined} The transform function (if found).\n */\nexport function get(sourceCode, destinationCode) {\n  let transform;\n  if (sourceCode in transforms && destinationCode in transforms[sourceCode]) {\n    transform = transforms[sourceCode][destinationCode];\n  }\n  return transform;\n}\n","/**\n * @module ol/proj\n */\n\n/**\n * The ol/proj module stores:\n * * a list of {@link module:ol/proj/Projection}\n * objects, one for each projection supported by the application\n * * a list of transform functions needed to convert coordinates in one projection\n * into another.\n *\n * The static functions are the methods used to maintain these.\n * Each transform function can handle not only simple coordinate pairs, but also\n * large arrays of coordinates such as vector geometries.\n *\n * When loaded, the library adds projection objects for EPSG:4326 (WGS84\n * geographic coordinates) and EPSG:3857 (Web or Spherical Mercator, as used\n * for example by Bing Maps or OpenStreetMap), together with the relevant\n * transform functions.\n *\n * Additional transforms may be added by using the http://proj4js.org/\n * library (version 2.2 or later). You can use the full build supplied by\n * Proj4js, or create a custom build to support those projections you need; see\n * the Proj4js website for how to do this. You also need the Proj4js definitions\n * for the required projections. These definitions can be obtained from\n * https://epsg.io/, and are a JS function, so can be loaded in a script\n * tag (as in the examples) or pasted into your application.\n *\n * After all required projection definitions are added to proj4's registry (by\n * using `proj4.defs()`), simply call `register(proj4)` from the `ol/proj/proj4`\n * package. Existing transforms are not changed by this function. See\n * examples/wms-image-custom-proj for an example of this.\n *\n * Additional projection definitions can be registered with `proj4.defs()` any\n * time. Just make sure to call `register(proj4)` again; for example, with user-supplied data where you don't\n * know in advance what projections are needed, you can initially load minimal\n * support and then load whichever are requested.\n *\n * Note that Proj4js does not support projection extents. If you want to add\n * one for creating default tile grids, you can add it after the Projection\n * object has been created with `setExtent`, for example,\n * `get('EPSG:1234').setExtent(extent)`.\n *\n * In addition to Proj4js support, any transform functions can be added with\n * {@link module:ol/proj~addCoordinateTransforms}. To use this, you must first create\n * a {@link module:ol/proj/Projection} object for the new projection and add it with\n * {@link module:ol/proj~addProjection}. You can then add the forward and inverse\n * functions with {@link module:ol/proj~addCoordinateTransforms}. See\n * examples/wms-custom-proj for an example of this.\n *\n * Note that if no transforms are needed and you only need to define the\n * projection, just add a {@link module:ol/proj/Projection} with\n * {@link module:ol/proj~addProjection}. See examples/wms-no-proj for an example of\n * this.\n */\nimport {getDistance} from './sphere.js';\nimport {applyTransform} from './extent.js';\nimport {modulo} from './math.js';\nimport {toEPSG4326, fromEPSG4326, PROJECTIONS as EPSG3857_PROJECTIONS} from './proj/epsg3857.js';\nimport {PROJECTIONS as EPSG4326_PROJECTIONS} from './proj/epsg4326.js';\nimport Projection from './proj/Projection.js';\nimport Units, {METERS_PER_UNIT} from './proj/Units.js';\nimport * as projections from './proj/projections.js';\nimport {add as addTransformFunc, clear as clearTransformFuncs, get as getTransformFunc} from './proj/transforms.js';\n\n\n/**\n * A projection as {@link module:ol/proj/Projection}, SRS identifier\n * string or undefined.\n * @typedef {Projection|string|undefined} ProjectionLike\n * @api\n */\n\n\n/**\n * A transform function accepts an array of input coordinate values, an optional\n * output array, and an optional dimension (default should be 2).  The function\n * transforms the input coordinate values, populates the output array, and\n * returns the output array.\n *\n * @typedef {function(Array<number>, Array<number>=, number=): Array<number>} TransformFunction\n * @api\n */\n\n\nexport {METERS_PER_UNIT};\n\nexport {Projection};\n\n/**\n * @param {Array<number>} input Input coordinate array.\n * @param {Array<number>=} opt_output Output array of coordinate values.\n * @param {number=} opt_dimension Dimension.\n * @return {Array<number>} Output coordinate array (new array, same coordinate\n *     values).\n */\nexport function cloneTransform(input, opt_output, opt_dimension) {\n  let output;\n  if (opt_output !== undefined) {\n    for (let i = 0, ii = input.length; i < ii; ++i) {\n      opt_output[i] = input[i];\n    }\n    output = opt_output;\n  } else {\n    output = input.slice();\n  }\n  return output;\n}\n\n\n/**\n * @param {Array<number>} input Input coordinate array.\n * @param {Array<number>=} opt_output Output array of coordinate values.\n * @param {number=} opt_dimension Dimension.\n * @return {Array<number>} Input coordinate array (same array as input).\n */\nexport function identityTransform(input, opt_output, opt_dimension) {\n  if (opt_output !== undefined && input !== opt_output) {\n    for (let i = 0, ii = input.length; i < ii; ++i) {\n      opt_output[i] = input[i];\n    }\n    input = opt_output;\n  }\n  return input;\n}\n\n\n/**\n * Add a Projection object to the list of supported projections that can be\n * looked up by their code.\n *\n * @param {Projection} projection Projection instance.\n * @api\n */\nexport function addProjection(projection) {\n  projections.add(projection.getCode(), projection);\n  addTransformFunc(projection, projection, cloneTransform);\n}\n\n\n/**\n * @param {Array<Projection>} projections Projections.\n */\nexport function addProjections(projections) {\n  projections.forEach(addProjection);\n}\n\n\n/**\n * Fetches a Projection object for the code specified.\n *\n * @param {ProjectionLike} projectionLike Either a code string which is\n *     a combination of authority and identifier such as \"EPSG:4326\", or an\n *     existing projection object, or undefined.\n * @return {Projection} Projection object, or null if not in list.\n * @api\n */\nexport function get(projectionLike) {\n  return typeof projectionLike === 'string' ?\n    projections.get(/** @type {string} */ (projectionLike)) :\n    (/** @type {Projection} */ (projectionLike) || null);\n}\n\n\n/**\n * Get the resolution of the point in degrees or distance units.\n * For projections with degrees as the unit this will simply return the\n * provided resolution. For other projections the point resolution is\n * by default estimated by transforming the 'point' pixel to EPSG:4326,\n * measuring its width and height on the normal sphere,\n * and taking the average of the width and height.\n * A custom function can be provided for a specific projection, either\n * by setting the `getPointResolution` option in the\n * {@link module:ol/proj/Projection~Projection} constructor or by using\n * {@link module:ol/proj/Projection~Projection#setGetPointResolution} to change an existing\n * projection object.\n * @param {ProjectionLike} projection The projection.\n * @param {number} resolution Nominal resolution in projection units.\n * @param {import(\"./coordinate.js\").Coordinate} point Point to find adjusted resolution at.\n * @param {Units=} opt_units Units to get the point resolution in.\n * Default is the projection's units.\n * @return {number} Point resolution.\n * @api\n */\nexport function getPointResolution(projection, resolution, point, opt_units) {\n  projection = get(projection);\n  let pointResolution;\n  const getter = projection.getPointResolutionFunc();\n  if (getter) {\n    pointResolution = getter(resolution, point);\n  } else {\n    const units = projection.getUnits();\n    if (units == Units.DEGREES && !opt_units || opt_units == Units.DEGREES) {\n      pointResolution = resolution;\n    } else {\n      // Estimate point resolution by transforming the center pixel to EPSG:4326,\n      // measuring its width and height on the normal sphere, and taking the\n      // average of the width and height.\n      const toEPSG4326 = getTransformFromProjections(projection, get('EPSG:4326'));\n      let vertices = [\n        point[0] - resolution / 2, point[1],\n        point[0] + resolution / 2, point[1],\n        point[0], point[1] - resolution / 2,\n        point[0], point[1] + resolution / 2\n      ];\n      vertices = toEPSG4326(vertices, vertices, 2);\n      const width = getDistance(vertices.slice(0, 2), vertices.slice(2, 4));\n      const height = getDistance(vertices.slice(4, 6), vertices.slice(6, 8));\n      pointResolution = (width + height) / 2;\n      const metersPerUnit = opt_units ?\n        METERS_PER_UNIT[opt_units] :\n        projection.getMetersPerUnit();\n      if (metersPerUnit !== undefined) {\n        pointResolution /= metersPerUnit;\n      }\n    }\n  }\n  return pointResolution;\n}\n\n\n/**\n * Registers transformation functions that don't alter coordinates. Those allow\n * to transform between projections with equal meaning.\n *\n * @param {Array<Projection>} projections Projections.\n * @api\n */\nexport function addEquivalentProjections(projections) {\n  addProjections(projections);\n  projections.forEach(function(source) {\n    projections.forEach(function(destination) {\n      if (source !== destination) {\n        addTransformFunc(source, destination, cloneTransform);\n      }\n    });\n  });\n}\n\n\n/**\n * Registers transformation functions to convert coordinates in any projection\n * in projection1 to any projection in projection2.\n *\n * @param {Array<Projection>} projections1 Projections with equal\n *     meaning.\n * @param {Array<Projection>} projections2 Projections with equal\n *     meaning.\n * @param {TransformFunction} forwardTransform Transformation from any\n *   projection in projection1 to any projection in projection2.\n * @param {TransformFunction} inverseTransform Transform from any projection\n *   in projection2 to any projection in projection1..\n */\nexport function addEquivalentTransforms(projections1, projections2, forwardTransform, inverseTransform) {\n  projections1.forEach(function(projection1) {\n    projections2.forEach(function(projection2) {\n      addTransformFunc(projection1, projection2, forwardTransform);\n      addTransformFunc(projection2, projection1, inverseTransform);\n    });\n  });\n}\n\n\n/**\n * Clear all cached projections and transforms.\n */\nexport function clearAllProjections() {\n  projections.clear();\n  clearTransformFuncs();\n}\n\n\n/**\n * @param {Projection|string|undefined} projection Projection.\n * @param {string} defaultCode Default code.\n * @return {Projection} Projection.\n */\nexport function createProjection(projection, defaultCode) {\n  if (!projection) {\n    return get(defaultCode);\n  } else if (typeof projection === 'string') {\n    return get(projection);\n  } else {\n    return (\n      /** @type {Projection} */ (projection)\n    );\n  }\n}\n\n\n/**\n * Creates a {@link module:ol/proj~TransformFunction} from a simple 2D coordinate transform\n * function.\n * @param {function(import(\"./coordinate.js\").Coordinate): import(\"./coordinate.js\").Coordinate} coordTransform Coordinate\n *     transform.\n * @return {TransformFunction} Transform function.\n */\nexport function createTransformFromCoordinateTransform(coordTransform) {\n  return (\n    /**\n     * @param {Array<number>} input Input.\n     * @param {Array<number>=} opt_output Output.\n     * @param {number=} opt_dimension Dimension.\n     * @return {Array<number>} Output.\n     */\n    function(input, opt_output, opt_dimension) {\n      const length = input.length;\n      const dimension = opt_dimension !== undefined ? opt_dimension : 2;\n      const output = opt_output !== undefined ? opt_output : new Array(length);\n      for (let i = 0; i < length; i += dimension) {\n        const point = coordTransform([input[i], input[i + 1]]);\n        output[i] = point[0];\n        output[i + 1] = point[1];\n        for (let j = dimension - 1; j >= 2; --j) {\n          output[i + j] = input[i + j];\n        }\n      }\n      return output;\n    });\n}\n\n\n/**\n * Registers coordinate transform functions to convert coordinates between the\n * source projection and the destination projection.\n * The forward and inverse functions convert coordinate pairs; this function\n * converts these into the functions used internally which also handle\n * extents and coordinate arrays.\n *\n * @param {ProjectionLike} source Source projection.\n * @param {ProjectionLike} destination Destination projection.\n * @param {function(import(\"./coordinate.js\").Coordinate): import(\"./coordinate.js\").Coordinate} forward The forward transform\n *     function (that is, from the source projection to the destination\n *     projection) that takes a {@link module:ol/coordinate~Coordinate} as argument and returns\n *     the transformed {@link module:ol/coordinate~Coordinate}.\n * @param {function(import(\"./coordinate.js\").Coordinate): import(\"./coordinate.js\").Coordinate} inverse The inverse transform\n *     function (that is, from the destination projection to the source\n *     projection) that takes a {@link module:ol/coordinate~Coordinate} as argument and returns\n *     the transformed {@link module:ol/coordinate~Coordinate}.\n * @api\n */\nexport function addCoordinateTransforms(source, destination, forward, inverse) {\n  const sourceProj = get(source);\n  const destProj = get(destination);\n  addTransformFunc(sourceProj, destProj, createTransformFromCoordinateTransform(forward));\n  addTransformFunc(destProj, sourceProj, createTransformFromCoordinateTransform(inverse));\n}\n\n\n/**\n * Transforms a coordinate from longitude/latitude to a different projection.\n * @param {import(\"./coordinate.js\").Coordinate} coordinate Coordinate as longitude and latitude, i.e.\n *     an array with longitude as 1st and latitude as 2nd element.\n * @param {ProjectionLike=} opt_projection Target projection. The\n *     default is Web Mercator, i.e. 'EPSG:3857'.\n * @return {import(\"./coordinate.js\").Coordinate} Coordinate projected to the target projection.\n * @api\n */\nexport function fromLonLat(coordinate, opt_projection) {\n  return transform(coordinate, 'EPSG:4326',\n    opt_projection !== undefined ? opt_projection : 'EPSG:3857');\n}\n\n\n/**\n * Transforms a coordinate to longitude/latitude.\n * @param {import(\"./coordinate.js\").Coordinate} coordinate Projected coordinate.\n * @param {ProjectionLike=} opt_projection Projection of the coordinate.\n *     The default is Web Mercator, i.e. 'EPSG:3857'.\n * @return {import(\"./coordinate.js\").Coordinate} Coordinate as longitude and latitude, i.e. an array\n *     with longitude as 1st and latitude as 2nd element.\n * @api\n */\nexport function toLonLat(coordinate, opt_projection) {\n  const lonLat = transform(coordinate,\n    opt_projection !== undefined ? opt_projection : 'EPSG:3857', 'EPSG:4326');\n  const lon = lonLat[0];\n  if (lon < -180 || lon > 180) {\n    lonLat[0] = modulo(lon + 180, 360) - 180;\n  }\n  return lonLat;\n}\n\n\n/**\n * Checks if two projections are the same, that is every coordinate in one\n * projection does represent the same geographic point as the same coordinate in\n * the other projection.\n *\n * @param {Projection} projection1 Projection 1.\n * @param {Projection} projection2 Projection 2.\n * @return {boolean} Equivalent.\n * @api\n */\nexport function equivalent(projection1, projection2) {\n  if (projection1 === projection2) {\n    return true;\n  }\n  const equalUnits = projection1.getUnits() === projection2.getUnits();\n  if (projection1.getCode() === projection2.getCode()) {\n    return equalUnits;\n  } else {\n    const transformFunc = getTransformFromProjections(projection1, projection2);\n    return transformFunc === cloneTransform && equalUnits;\n  }\n}\n\n\n/**\n * Searches in the list of transform functions for the function for converting\n * coordinates from the source projection to the destination projection.\n *\n * @param {Projection} sourceProjection Source Projection object.\n * @param {Projection} destinationProjection Destination Projection\n *     object.\n * @return {TransformFunction} Transform function.\n */\nexport function getTransformFromProjections(sourceProjection, destinationProjection) {\n  const sourceCode = sourceProjection.getCode();\n  const destinationCode = destinationProjection.getCode();\n  let transformFunc = getTransformFunc(sourceCode, destinationCode);\n  if (!transformFunc) {\n    transformFunc = identityTransform;\n  }\n  return transformFunc;\n}\n\n\n/**\n * Given the projection-like objects, searches for a transformation\n * function to convert a coordinates array from the source projection to the\n * destination projection.\n *\n * @param {ProjectionLike} source Source.\n * @param {ProjectionLike} destination Destination.\n * @return {TransformFunction} Transform function.\n * @api\n */\nexport function getTransform(source, destination) {\n  const sourceProjection = get(source);\n  const destinationProjection = get(destination);\n  return getTransformFromProjections(sourceProjection, destinationProjection);\n}\n\n\n/**\n * Transforms a coordinate from source projection to destination projection.\n * This returns a new coordinate (and does not modify the original).\n *\n * See {@link module:ol/proj~transformExtent} for extent transformation.\n * See the transform method of {@link module:ol/geom/Geometry~Geometry} and its\n * subclasses for geometry transforms.\n *\n * @param {import(\"./coordinate.js\").Coordinate} coordinate Coordinate.\n * @param {ProjectionLike} source Source projection-like.\n * @param {ProjectionLike} destination Destination projection-like.\n * @return {import(\"./coordinate.js\").Coordinate} Coordinate.\n * @api\n */\nexport function transform(coordinate, source, destination) {\n  const transformFunc = getTransform(source, destination);\n  return transformFunc(coordinate, undefined, coordinate.length);\n}\n\n\n/**\n * Transforms an extent from source projection to destination projection.  This\n * returns a new extent (and does not modify the original).\n *\n * @param {import(\"./extent.js\").Extent} extent The extent to transform.\n * @param {ProjectionLike} source Source projection-like.\n * @param {ProjectionLike} destination Destination projection-like.\n * @return {import(\"./extent.js\").Extent} The transformed extent.\n * @api\n */\nexport function transformExtent(extent, source, destination) {\n  const transformFunc = getTransform(source, destination);\n  return applyTransform(extent, transformFunc);\n}\n\n\n/**\n * Transforms the given point to the destination projection.\n *\n * @param {import(\"./coordinate.js\").Coordinate} point Point.\n * @param {Projection} sourceProjection Source projection.\n * @param {Projection} destinationProjection Destination projection.\n * @return {import(\"./coordinate.js\").Coordinate} Point.\n */\nexport function transformWithProjections(point, sourceProjection, destinationProjection) {\n  const transformFunc = getTransformFromProjections(sourceProjection, destinationProjection);\n  return transformFunc(point);\n}\n\n/**\n * Add transforms to and from EPSG:4326 and EPSG:3857.  This function is called\n * by when this module is executed and should only need to be called again after\n * `clearAllProjections()` is called (e.g. in tests).\n */\nexport function addCommon() {\n  // Add transformations that don't alter coordinates to convert within set of\n  // projections with equal meaning.\n  addEquivalentProjections(EPSG3857_PROJECTIONS);\n  addEquivalentProjections(EPSG4326_PROJECTIONS);\n  // Add transformations to convert EPSG:4326 like coordinates to EPSG:3857 like\n  // coordinates and back.\n  addEquivalentTransforms(EPSG4326_PROJECTIONS, EPSG3857_PROJECTIONS, fromEPSG4326, toEPSG4326);\n}\n\naddCommon();\n","/**\n * @module ol/transform\n */\nimport {assert} from './asserts.js';\n\n\n/**\n * An array representing an affine 2d transformation for use with\n * {@link module:ol/transform} functions. The array has 6 elements.\n * @typedef {!Array<number>} Transform\n */\n\n\n/**\n * Collection of affine 2d transformation functions. The functions work on an\n * array of 6 elements. The element order is compatible with the [SVGMatrix\n * interface](https://developer.mozilla.org/en-US/docs/Web/API/SVGMatrix) and is\n * a subset (elements a to f) of a 3×3 matrix:\n * ```\n * [ a c e ]\n * [ b d f ]\n * [ 0 0 1 ]\n * ```\n */\n\n\n/**\n * @private\n * @type {Transform}\n */\nconst tmp_ = new Array(6);\n\n\n/**\n * Create an identity transform.\n * @return {!Transform} Identity transform.\n */\nexport function create() {\n  return [1, 0, 0, 1, 0, 0];\n}\n\n\n/**\n * Resets the given transform to an identity transform.\n * @param {!Transform} transform Transform.\n * @return {!Transform} Transform.\n */\nexport function reset(transform) {\n  return set(transform, 1, 0, 0, 1, 0, 0);\n}\n\n\n/**\n * Multiply the underlying matrices of two transforms and return the result in\n * the first transform.\n * @param {!Transform} transform1 Transform parameters of matrix 1.\n * @param {!Transform} transform2 Transform parameters of matrix 2.\n * @return {!Transform} transform1 multiplied with transform2.\n */\nexport function multiply(transform1, transform2) {\n  const a1 = transform1[0];\n  const b1 = transform1[1];\n  const c1 = transform1[2];\n  const d1 = transform1[3];\n  const e1 = transform1[4];\n  const f1 = transform1[5];\n  const a2 = transform2[0];\n  const b2 = transform2[1];\n  const c2 = transform2[2];\n  const d2 = transform2[3];\n  const e2 = transform2[4];\n  const f2 = transform2[5];\n\n  transform1[0] = a1 * a2 + c1 * b2;\n  transform1[1] = b1 * a2 + d1 * b2;\n  transform1[2] = a1 * c2 + c1 * d2;\n  transform1[3] = b1 * c2 + d1 * d2;\n  transform1[4] = a1 * e2 + c1 * f2 + e1;\n  transform1[5] = b1 * e2 + d1 * f2 + f1;\n\n  return transform1;\n}\n\n/**\n * Set the transform components a-f on a given transform.\n * @param {!Transform} transform Transform.\n * @param {number} a The a component of the transform.\n * @param {number} b The b component of the transform.\n * @param {number} c The c component of the transform.\n * @param {number} d The d component of the transform.\n * @param {number} e The e component of the transform.\n * @param {number} f The f component of the transform.\n * @return {!Transform} Matrix with transform applied.\n */\nexport function set(transform, a, b, c, d, e, f) {\n  transform[0] = a;\n  transform[1] = b;\n  transform[2] = c;\n  transform[3] = d;\n  transform[4] = e;\n  transform[5] = f;\n  return transform;\n}\n\n\n/**\n * Set transform on one matrix from another matrix.\n * @param {!Transform} transform1 Matrix to set transform to.\n * @param {!Transform} transform2 Matrix to set transform from.\n * @return {!Transform} transform1 with transform from transform2 applied.\n */\nexport function setFromArray(transform1, transform2) {\n  transform1[0] = transform2[0];\n  transform1[1] = transform2[1];\n  transform1[2] = transform2[2];\n  transform1[3] = transform2[3];\n  transform1[4] = transform2[4];\n  transform1[5] = transform2[5];\n  return transform1;\n}\n\n\n/**\n * Transforms the given coordinate with the given transform returning the\n * resulting, transformed coordinate. The coordinate will be modified in-place.\n *\n * @param {Transform} transform The transformation.\n * @param {import(\"./coordinate.js\").Coordinate|import(\"./pixel.js\").Pixel} coordinate The coordinate to transform.\n * @return {import(\"./coordinate.js\").Coordinate|import(\"./pixel.js\").Pixel} return coordinate so that operations can be\n *     chained together.\n */\nexport function apply(transform, coordinate) {\n  const x = coordinate[0];\n  const y = coordinate[1];\n  coordinate[0] = transform[0] * x + transform[2] * y + transform[4];\n  coordinate[1] = transform[1] * x + transform[3] * y + transform[5];\n  return coordinate;\n}\n\n\n/**\n * Applies rotation to the given transform.\n * @param {!Transform} transform Transform.\n * @param {number} angle Angle in radians.\n * @return {!Transform} The rotated transform.\n */\nexport function rotate(transform, angle) {\n  const cos = Math.cos(angle);\n  const sin = Math.sin(angle);\n  return multiply(transform, set(tmp_, cos, sin, -sin, cos, 0, 0));\n}\n\n\n/**\n * Applies scale to a given transform.\n * @param {!Transform} transform Transform.\n * @param {number} x Scale factor x.\n * @param {number} y Scale factor y.\n * @return {!Transform} The scaled transform.\n */\nexport function scale(transform, x, y) {\n  return multiply(transform, set(tmp_, x, 0, 0, y, 0, 0));\n}\n\n\n/**\n * Applies translation to the given transform.\n * @param {!Transform} transform Transform.\n * @param {number} dx Translation x.\n * @param {number} dy Translation y.\n * @return {!Transform} The translated transform.\n */\nexport function translate(transform, dx, dy) {\n  return multiply(transform, set(tmp_, 1, 0, 0, 1, dx, dy));\n}\n\n\n/**\n * Creates a composite transform given an initial translation, scale, rotation, and\n * final translation (in that order only, not commutative).\n * @param {!Transform} transform The transform (will be modified in place).\n * @param {number} dx1 Initial translation x.\n * @param {number} dy1 Initial translation y.\n * @param {number} sx Scale factor x.\n * @param {number} sy Scale factor y.\n * @param {number} angle Rotation (in counter-clockwise radians).\n * @param {number} dx2 Final translation x.\n * @param {number} dy2 Final translation y.\n * @return {!Transform} The composite transform.\n */\nexport function compose(transform, dx1, dy1, sx, sy, angle, dx2, dy2) {\n  const sin = Math.sin(angle);\n  const cos = Math.cos(angle);\n  transform[0] = sx * cos;\n  transform[1] = sy * sin;\n  transform[2] = -sx * sin;\n  transform[3] = sy * cos;\n  transform[4] = dx2 * sx * cos - dy2 * sx * sin + dx1;\n  transform[5] = dx2 * sy * sin + dy2 * sy * cos + dy1;\n  return transform;\n}\n\n\n/**\n * Invert the given transform.\n * @param {!Transform} transform Transform.\n * @return {!Transform} Inverse of the transform.\n */\nexport function invert(transform) {\n  const det = determinant(transform);\n  assert(det !== 0, 32); // Transformation matrix cannot be inverted\n\n  const a = transform[0];\n  const b = transform[1];\n  const c = transform[2];\n  const d = transform[3];\n  const e = transform[4];\n  const f = transform[5];\n\n  transform[0] = d / det;\n  transform[1] = -b / det;\n  transform[2] = -c / det;\n  transform[3] = a / det;\n  transform[4] = (c * f - d * e) / det;\n  transform[5] = -(a * f - b * e) / det;\n\n  return transform;\n}\n\n\n/**\n * Returns the determinant of the given matrix.\n * @param {!Transform} mat Matrix.\n * @return {number} Determinant.\n */\nexport function determinant(mat) {\n  return mat[0] * mat[3] - mat[1] * mat[2];\n}\n","/**\n * @module ol/geom/Geometry\n */\nimport {abstract} from '../util.js';\nimport BaseObject from '../Object.js';\nimport {createEmpty, getHeight, returnOrUpdate} from '../extent.js';\nimport {transform2D} from './flat/transform.js';\nimport {get as getProjection, getTransform} from '../proj.js';\nimport Units from '../proj/Units.js';\nimport {create as createTransform, compose as composeTransform} from '../transform.js';\n\n\n/**\n * @type {import(\"../transform.js\").Transform}\n */\nconst tmpTransform = createTransform();\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Base class for vector geometries.\n *\n * To get notified of changes to the geometry, register a listener for the\n * generic `change` event on your geometry instance.\n *\n * @abstract\n * @api\n */\nclass Geometry extends BaseObject {\n  constructor() {\n\n    super();\n\n    /**\n     * @private\n     * @type {import(\"../extent.js\").Extent}\n     */\n    this.extent_ = createEmpty();\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.extentRevision_ = -1;\n\n    /**\n     * @protected\n     * @type {Object<string, Geometry>}\n     */\n    this.simplifiedGeometryCache = {};\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.simplifiedGeometryMaxMinSquaredTolerance = 0;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.simplifiedGeometryRevision = 0;\n\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @abstract\n   * @return {!Geometry} Clone.\n   */\n  clone() {\n    return abstract();\n  }\n\n  /**\n   * @abstract\n   * @param {number} x X.\n   * @param {number} y Y.\n   * @param {import(\"../coordinate.js\").Coordinate} closestPoint Closest point.\n   * @param {number} minSquaredDistance Minimum squared distance.\n   * @return {number} Minimum squared distance.\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    return abstract();\n  }\n\n  /**\n   * @param {number} x X.\n   * @param {number} y Y.\n   * @return {boolean} Contains (x, y).\n   */\n  containsXY(x, y) {\n    return false;\n  }\n\n  /**\n   * Return the closest point of the geometry to the passed point as\n   * {@link module:ol/coordinate~Coordinate coordinate}.\n   * @param {import(\"../coordinate.js\").Coordinate} point Point.\n   * @param {import(\"../coordinate.js\").Coordinate=} opt_closestPoint Closest point.\n   * @return {import(\"../coordinate.js\").Coordinate} Closest point.\n   * @api\n   */\n  getClosestPoint(point, opt_closestPoint) {\n    const closestPoint = opt_closestPoint ? opt_closestPoint : [NaN, NaN];\n    this.closestPointXY(point[0], point[1], closestPoint, Infinity);\n    return closestPoint;\n  }\n\n  /**\n   * Returns true if this geometry includes the specified coordinate. If the\n   * coordinate is on the boundary of the geometry, returns false.\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @return {boolean} Contains coordinate.\n   * @api\n   */\n  intersectsCoordinate(coordinate) {\n    return this.containsXY(coordinate[0], coordinate[1]);\n  }\n\n  /**\n   * @abstract\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @protected\n   * @return {import(\"../extent.js\").Extent} extent Extent.\n   */\n  computeExtent(extent) {\n    return abstract();\n  }\n\n  /**\n   * Get the extent of the geometry.\n   * @param {import(\"../extent.js\").Extent=} opt_extent Extent.\n   * @return {import(\"../extent.js\").Extent} extent Extent.\n   * @api\n   */\n  getExtent(opt_extent) {\n    if (this.extentRevision_ != this.getRevision()) {\n      this.extent_ = this.computeExtent(this.extent_);\n      this.extentRevision_ = this.getRevision();\n    }\n    return returnOrUpdate(this.extent_, opt_extent);\n  }\n\n  /**\n   * Rotate the geometry around a given coordinate. This modifies the geometry\n   * coordinates in place.\n   * @abstract\n   * @param {number} angle Rotation angle in radians.\n   * @param {import(\"../coordinate.js\").Coordinate} anchor The rotation center.\n   * @api\n   */\n  rotate(angle, anchor) {\n    abstract();\n  }\n\n  /**\n   * Scale the geometry (with an optional origin).  This modifies the geometry\n   * coordinates in place.\n   * @abstract\n   * @param {number} sx The scaling factor in the x-direction.\n   * @param {number=} opt_sy The scaling factor in the y-direction (defaults to\n   *     sx).\n   * @param {import(\"../coordinate.js\").Coordinate=} opt_anchor The scale origin (defaults to the center\n   *     of the geometry extent).\n   * @api\n   */\n  scale(sx, opt_sy, opt_anchor) {\n    abstract();\n  }\n\n  /**\n   * Create a simplified version of this geometry.  For linestrings, this uses\n   * the the {@link\n   * https://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm\n   * Douglas Peucker} algorithm.  For polygons, a quantization-based\n   * simplification is used to preserve topology.\n   * @param {number} tolerance The tolerance distance for simplification.\n   * @return {Geometry} A new, simplified version of the original geometry.\n   * @api\n   */\n  simplify(tolerance) {\n    return this.getSimplifiedGeometry(tolerance * tolerance);\n  }\n\n  /**\n   * Create a simplified version of this geometry using the Douglas Peucker\n   * algorithm.\n   * See https://en.wikipedia.org/wiki/Ramer-Douglas-Peucker_algorithm.\n   * @abstract\n   * @param {number} squaredTolerance Squared tolerance.\n   * @return {Geometry} Simplified geometry.\n   */\n  getSimplifiedGeometry(squaredTolerance) {\n    return abstract();\n  }\n\n  /**\n   * Get the type of this geometry.\n   * @abstract\n   * @return {import(\"./GeometryType.js\").default} Geometry type.\n   */\n  getType() {\n    return abstract();\n  }\n\n  /**\n   * Apply a transform function to each coordinate of the geometry.\n   * The geometry is modified in place.\n   * If you do not want the geometry modified in place, first `clone()` it and\n   * then use this function on the clone.\n   * @abstract\n   * @param {import(\"../proj.js\").TransformFunction} transformFn Transform.\n   */\n  applyTransform(transformFn) {\n    abstract();\n  }\n\n  /**\n   * Test if the geometry and the passed extent intersect.\n   * @abstract\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @return {boolean} `true` if the geometry and the extent intersect.\n   */\n  intersectsExtent(extent) {\n    return abstract();\n  }\n\n  /**\n   * Translate the geometry.  This modifies the geometry coordinates in place.  If\n   * instead you want a new geometry, first `clone()` this geometry.\n   * @abstract\n   * @param {number} deltaX Delta X.\n   * @param {number} deltaY Delta Y.\n   * @api\n   */\n  translate(deltaX, deltaY) {\n    abstract();\n  }\n\n  /**\n   * Transform each coordinate of the geometry from one coordinate reference\n   * system to another. The geometry is modified in place.\n   * For example, a line will be transformed to a line and a circle to a circle.\n   * If you do not want the geometry modified in place, first `clone()` it and\n   * then use this function on the clone.\n   *\n   * @param {import(\"../proj.js\").ProjectionLike} source The current projection.  Can be a\n   *     string identifier or a {@link module:ol/proj/Projection~Projection} object.\n   * @param {import(\"../proj.js\").ProjectionLike} destination The desired projection.  Can be a\n   *     string identifier or a {@link module:ol/proj/Projection~Projection} object.\n   * @return {Geometry} This geometry.  Note that original geometry is\n   *     modified in place.\n   * @api\n   */\n  transform(source, destination) {\n    /** @type {import(\"../proj/Projection.js\").default} */\n    const sourceProj = getProjection(source);\n    const transformFn = sourceProj.getUnits() == Units.TILE_PIXELS ?\n      function(inCoordinates, outCoordinates, stride) {\n        const pixelExtent = sourceProj.getExtent();\n        const projectedExtent = sourceProj.getWorldExtent();\n        const scale = getHeight(projectedExtent) / getHeight(pixelExtent);\n        composeTransform(tmpTransform,\n          projectedExtent[0], projectedExtent[3],\n          scale, -scale, 0,\n          0, 0);\n        transform2D(inCoordinates, 0, inCoordinates.length, stride,\n          tmpTransform, outCoordinates);\n        return getTransform(sourceProj, destination)(inCoordinates, outCoordinates, stride);\n      } :\n      getTransform(sourceProj, destination);\n    this.applyTransform(transformFn);\n    return this;\n  }\n\n}\n\n\nexport default Geometry;\n","/**\n * @module ol/geom/SimpleGeometry\n */\nimport {abstract} from '../util.js';\nimport {createOrUpdateFromFlatCoordinates, getCenter} from '../extent.js';\nimport Geometry from './Geometry.js';\nimport GeometryLayout from './GeometryLayout.js';\nimport {rotate, scale, translate, transform2D} from './flat/transform.js';\nimport {clear} from '../obj.js';\n\n/**\n * @classdesc\n * Abstract base class; only used for creating subclasses; do not instantiate\n * in apps, as cannot be rendered.\n *\n * @abstract\n * @api\n */\nclass SimpleGeometry extends Geometry {\n  constructor() {\n\n    super();\n\n    /**\n     * @protected\n     * @type {GeometryLayout}\n     */\n    this.layout = GeometryLayout.XY;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.stride = 2;\n\n    /**\n     * @protected\n     * @type {Array<number>}\n     */\n    this.flatCoordinates = null;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  computeExtent(extent) {\n    return createOrUpdateFromFlatCoordinates(this.flatCoordinates,\n      0, this.flatCoordinates.length, this.stride, extent);\n  }\n\n  /**\n   * @abstract\n   * @return {Array} Coordinates.\n   */\n  getCoordinates() {\n    return abstract();\n  }\n\n  /**\n   * Return the first coordinate of the geometry.\n   * @return {import(\"../coordinate.js\").Coordinate} First coordinate.\n   * @api\n   */\n  getFirstCoordinate() {\n    return this.flatCoordinates.slice(0, this.stride);\n  }\n\n  /**\n   * @return {Array<number>} Flat coordinates.\n   */\n  getFlatCoordinates() {\n    return this.flatCoordinates;\n  }\n\n  /**\n   * Return the last coordinate of the geometry.\n   * @return {import(\"../coordinate.js\").Coordinate} Last point.\n   * @api\n   */\n  getLastCoordinate() {\n    return this.flatCoordinates.slice(this.flatCoordinates.length - this.stride);\n  }\n\n  /**\n   * Return the {@link module:ol/geom/GeometryLayout layout} of the geometry.\n   * @return {GeometryLayout} Layout.\n   * @api\n   */\n  getLayout() {\n    return this.layout;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometry(squaredTolerance) {\n    if (this.simplifiedGeometryRevision != this.getRevision()) {\n      clear(this.simplifiedGeometryCache);\n      this.simplifiedGeometryMaxMinSquaredTolerance = 0;\n      this.simplifiedGeometryRevision = this.getRevision();\n    }\n    // If squaredTolerance is negative or if we know that simplification will not\n    // have any effect then just return this.\n    if (squaredTolerance < 0 ||\n        (this.simplifiedGeometryMaxMinSquaredTolerance !== 0 &&\n         squaredTolerance <= this.simplifiedGeometryMaxMinSquaredTolerance)) {\n      return this;\n    }\n    const key = squaredTolerance.toString();\n    if (this.simplifiedGeometryCache.hasOwnProperty(key)) {\n      return this.simplifiedGeometryCache[key];\n    } else {\n      const simplifiedGeometry =\n          this.getSimplifiedGeometryInternal(squaredTolerance);\n      const simplifiedFlatCoordinates = simplifiedGeometry.getFlatCoordinates();\n      if (simplifiedFlatCoordinates.length < this.flatCoordinates.length) {\n        this.simplifiedGeometryCache[key] = simplifiedGeometry;\n        return simplifiedGeometry;\n      } else {\n        // Simplification did not actually remove any coordinates.  We now know\n        // that any calls to getSimplifiedGeometry with a squaredTolerance less\n        // than or equal to the current squaredTolerance will also not have any\n        // effect.  This allows us to short circuit simplification (saving CPU\n        // cycles) and prevents the cache of simplified geometries from filling\n        // up with useless identical copies of this geometry (saving memory).\n        this.simplifiedGeometryMaxMinSquaredTolerance = squaredTolerance;\n        return this;\n      }\n    }\n  }\n\n  /**\n   * @param {number} squaredTolerance Squared tolerance.\n   * @return {SimpleGeometry} Simplified geometry.\n   * @protected\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    return this;\n  }\n\n  /**\n   * @return {number} Stride.\n   */\n  getStride() {\n    return this.stride;\n  }\n\n  /**\n   * @param {GeometryLayout} layout Layout.\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   */\n  setFlatCoordinates(layout, flatCoordinates) {\n    this.stride = getStrideForLayout(layout);\n    this.layout = layout;\n    this.flatCoordinates = flatCoordinates;\n  }\n\n  /**\n   * @abstract\n   * @param {!Array} coordinates Coordinates.\n   * @param {GeometryLayout=} opt_layout Layout.\n   */\n  setCoordinates(coordinates, opt_layout) {\n    abstract();\n  }\n\n  /**\n   * @param {GeometryLayout|undefined} layout Layout.\n   * @param {Array} coordinates Coordinates.\n   * @param {number} nesting Nesting.\n   * @protected\n   */\n  setLayout(layout, coordinates, nesting) {\n    /** @type {number} */\n    let stride;\n    if (layout) {\n      stride = getStrideForLayout(layout);\n    } else {\n      for (let i = 0; i < nesting; ++i) {\n        if (coordinates.length === 0) {\n          this.layout = GeometryLayout.XY;\n          this.stride = 2;\n          return;\n        } else {\n          coordinates = /** @type {Array} */ (coordinates[0]);\n        }\n      }\n      stride = coordinates.length;\n      layout = getLayoutForStride(stride);\n    }\n    this.layout = layout;\n    this.stride = stride;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  applyTransform(transformFn) {\n    if (this.flatCoordinates) {\n      transformFn(this.flatCoordinates, this.flatCoordinates, this.stride);\n      this.changed();\n    }\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  rotate(angle, anchor) {\n    const flatCoordinates = this.getFlatCoordinates();\n    if (flatCoordinates) {\n      const stride = this.getStride();\n      rotate(\n        flatCoordinates, 0, flatCoordinates.length,\n        stride, angle, anchor, flatCoordinates);\n      this.changed();\n    }\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  scale(sx, opt_sy, opt_anchor) {\n    let sy = opt_sy;\n    if (sy === undefined) {\n      sy = sx;\n    }\n    let anchor = opt_anchor;\n    if (!anchor) {\n      anchor = getCenter(this.getExtent());\n    }\n    const flatCoordinates = this.getFlatCoordinates();\n    if (flatCoordinates) {\n      const stride = this.getStride();\n      scale(\n        flatCoordinates, 0, flatCoordinates.length,\n        stride, sx, sy, anchor, flatCoordinates);\n      this.changed();\n    }\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  translate(deltaX, deltaY) {\n    const flatCoordinates = this.getFlatCoordinates();\n    if (flatCoordinates) {\n      const stride = this.getStride();\n      translate(\n        flatCoordinates, 0, flatCoordinates.length, stride,\n        deltaX, deltaY, flatCoordinates);\n      this.changed();\n    }\n  }\n}\n\n\n/**\n * @param {number} stride Stride.\n * @return {GeometryLayout} layout Layout.\n */\nfunction getLayoutForStride(stride) {\n  let layout;\n  if (stride == 2) {\n    layout = GeometryLayout.XY;\n  } else if (stride == 3) {\n    layout = GeometryLayout.XYZ;\n  } else if (stride == 4) {\n    layout = GeometryLayout.XYZM;\n  }\n  return (\n    /** @type {GeometryLayout} */ (layout)\n  );\n}\n\n\n/**\n * @param {GeometryLayout} layout Layout.\n * @return {number} Stride.\n */\nexport function getStrideForLayout(layout) {\n  let stride;\n  if (layout == GeometryLayout.XY) {\n    stride = 2;\n  } else if (layout == GeometryLayout.XYZ || layout == GeometryLayout.XYM) {\n    stride = 3;\n  } else if (layout == GeometryLayout.XYZM) {\n    stride = 4;\n  }\n  return /** @type {number} */ (stride);\n}\n\n\n/**\n * @param {SimpleGeometry} simpleGeometry Simple geometry.\n * @param {import(\"../transform.js\").Transform} transform Transform.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Transformed flat coordinates.\n */\nexport function transformGeom2D(simpleGeometry, transform, opt_dest) {\n  const flatCoordinates = simpleGeometry.getFlatCoordinates();\n  if (!flatCoordinates) {\n    return null;\n  } else {\n    const stride = simpleGeometry.getStride();\n    return transform2D(\n      flatCoordinates, 0, flatCoordinates.length, stride,\n      transform, opt_dest);\n  }\n}\n\nexport default SimpleGeometry;\n","/**\n * @module ol/geom/flat/area\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {number} Area.\n */\nexport function linearRing(flatCoordinates, offset, end, stride) {\n  let twiceArea = 0;\n  let x1 = flatCoordinates[end - stride];\n  let y1 = flatCoordinates[end - stride + 1];\n  for (; offset < end; offset += stride) {\n    const x2 = flatCoordinates[offset];\n    const y2 = flatCoordinates[offset + 1];\n    twiceArea += y1 * x2 - x1 * y2;\n    x1 = x2;\n    y1 = y2;\n  }\n  return twiceArea / 2;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @return {number} Area.\n */\nexport function linearRings(flatCoordinates, offset, ends, stride) {\n  let area = 0;\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    area += linearRing(flatCoordinates, offset, end, stride);\n    offset = end;\n  }\n  return area;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @return {number} Area.\n */\nexport function linearRingss(flatCoordinates, offset, endss, stride) {\n  let area = 0;\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    area += linearRings(flatCoordinates, offset, ends, stride);\n    offset = ends[ends.length - 1];\n  }\n  return area;\n}\n","/**\n * @module ol/geom/flat/closest\n */\nimport {lerp, squaredDistance as squaredDx} from '../../math.js';\n\n\n/**\n * Returns the point on the 2D line segment flatCoordinates[offset1] to\n * flatCoordinates[offset2] that is closest to the point (x, y).  Extra\n * dimensions are linearly interpolated.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset1 Offset 1.\n * @param {number} offset2 Offset 2.\n * @param {number} stride Stride.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {Array<number>} closestPoint Closest point.\n */\nfunction assignClosest(flatCoordinates, offset1, offset2, stride, x, y, closestPoint) {\n  const x1 = flatCoordinates[offset1];\n  const y1 = flatCoordinates[offset1 + 1];\n  const dx = flatCoordinates[offset2] - x1;\n  const dy = flatCoordinates[offset2 + 1] - y1;\n  let offset;\n  if (dx === 0 && dy === 0) {\n    offset = offset1;\n  } else {\n    const t = ((x - x1) * dx + (y - y1) * dy) / (dx * dx + dy * dy);\n    if (t > 1) {\n      offset = offset2;\n    } else if (t > 0) {\n      for (let i = 0; i < stride; ++i) {\n        closestPoint[i] = lerp(flatCoordinates[offset1 + i],\n          flatCoordinates[offset2 + i], t);\n      }\n      closestPoint.length = stride;\n      return;\n    } else {\n      offset = offset1;\n    }\n  }\n  for (let i = 0; i < stride; ++i) {\n    closestPoint[i] = flatCoordinates[offset + i];\n  }\n  closestPoint.length = stride;\n}\n\n\n/**\n * Return the squared of the largest distance between any pair of consecutive\n * coordinates.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} max Max squared delta.\n * @return {number} Max squared delta.\n */\nexport function maxSquaredDelta(flatCoordinates, offset, end, stride, max) {\n  let x1 = flatCoordinates[offset];\n  let y1 = flatCoordinates[offset + 1];\n  for (offset += stride; offset < end; offset += stride) {\n    const x2 = flatCoordinates[offset];\n    const y2 = flatCoordinates[offset + 1];\n    const squaredDelta = squaredDx(x1, y1, x2, y2);\n    if (squaredDelta > max) {\n      max = squaredDelta;\n    }\n    x1 = x2;\n    y1 = y2;\n  }\n  return max;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} max Max squared delta.\n * @return {number} Max squared delta.\n */\nexport function arrayMaxSquaredDelta(flatCoordinates, offset, ends, stride, max) {\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    max = maxSquaredDelta(\n      flatCoordinates, offset, end, stride, max);\n    offset = end;\n  }\n  return max;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {number} max Max squared delta.\n * @return {number} Max squared delta.\n */\nexport function multiArrayMaxSquaredDelta(flatCoordinates, offset, endss, stride, max) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    max = arrayMaxSquaredDelta(\n      flatCoordinates, offset, ends, stride, max);\n    offset = ends[ends.length - 1];\n  }\n  return max;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} maxDelta Max delta.\n * @param {boolean} isRing Is ring.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {Array<number>} closestPoint Closest point.\n * @param {number} minSquaredDistance Minimum squared distance.\n * @param {Array<number>=} opt_tmpPoint Temporary point object.\n * @return {number} Minimum squared distance.\n */\nexport function assignClosestPoint(flatCoordinates, offset, end,\n  stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,\n  opt_tmpPoint) {\n  if (offset == end) {\n    return minSquaredDistance;\n  }\n  let i, squaredDistance;\n  if (maxDelta === 0) {\n    // All points are identical, so just test the first point.\n    squaredDistance = squaredDx(\n      x, y, flatCoordinates[offset], flatCoordinates[offset + 1]);\n    if (squaredDistance < minSquaredDistance) {\n      for (i = 0; i < stride; ++i) {\n        closestPoint[i] = flatCoordinates[offset + i];\n      }\n      closestPoint.length = stride;\n      return squaredDistance;\n    } else {\n      return minSquaredDistance;\n    }\n  }\n  const tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];\n  let index = offset + stride;\n  while (index < end) {\n    assignClosest(\n      flatCoordinates, index - stride, index, stride, x, y, tmpPoint);\n    squaredDistance = squaredDx(x, y, tmpPoint[0], tmpPoint[1]);\n    if (squaredDistance < minSquaredDistance) {\n      minSquaredDistance = squaredDistance;\n      for (i = 0; i < stride; ++i) {\n        closestPoint[i] = tmpPoint[i];\n      }\n      closestPoint.length = stride;\n      index += stride;\n    } else {\n      // Skip ahead multiple points, because we know that all the skipped\n      // points cannot be any closer than the closest point we have found so\n      // far.  We know this because we know how close the current point is, how\n      // close the closest point we have found so far is, and the maximum\n      // distance between consecutive points.  For example, if we're currently\n      // at distance 10, the best we've found so far is 3, and that the maximum\n      // distance between consecutive points is 2, then we'll need to skip at\n      // least (10 - 3) / 2 == 3 (rounded down) points to have any chance of\n      // finding a closer point.  We use Math.max(..., 1) to ensure that we\n      // always advance at least one point, to avoid an infinite loop.\n      index += stride * Math.max(\n        ((Math.sqrt(squaredDistance) -\n            Math.sqrt(minSquaredDistance)) / maxDelta) | 0, 1);\n    }\n  }\n  if (isRing) {\n    // Check the closing segment.\n    assignClosest(\n      flatCoordinates, end - stride, offset, stride, x, y, tmpPoint);\n    squaredDistance = squaredDx(x, y, tmpPoint[0], tmpPoint[1]);\n    if (squaredDistance < minSquaredDistance) {\n      minSquaredDistance = squaredDistance;\n      for (i = 0; i < stride; ++i) {\n        closestPoint[i] = tmpPoint[i];\n      }\n      closestPoint.length = stride;\n    }\n  }\n  return minSquaredDistance;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} maxDelta Max delta.\n * @param {boolean} isRing Is ring.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {Array<number>} closestPoint Closest point.\n * @param {number} minSquaredDistance Minimum squared distance.\n * @param {Array<number>=} opt_tmpPoint Temporary point object.\n * @return {number} Minimum squared distance.\n */\nexport function assignClosestArrayPoint(flatCoordinates, offset, ends,\n  stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,\n  opt_tmpPoint) {\n  const tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    minSquaredDistance = assignClosestPoint(\n      flatCoordinates, offset, end, stride,\n      maxDelta, isRing, x, y, closestPoint, minSquaredDistance, tmpPoint);\n    offset = end;\n  }\n  return minSquaredDistance;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {number} maxDelta Max delta.\n * @param {boolean} isRing Is ring.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {Array<number>} closestPoint Closest point.\n * @param {number} minSquaredDistance Minimum squared distance.\n * @param {Array<number>=} opt_tmpPoint Temporary point object.\n * @return {number} Minimum squared distance.\n */\nexport function assignClosestMultiArrayPoint(flatCoordinates, offset,\n  endss, stride, maxDelta, isRing, x, y, closestPoint, minSquaredDistance,\n  opt_tmpPoint) {\n  const tmpPoint = opt_tmpPoint ? opt_tmpPoint : [NaN, NaN];\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    minSquaredDistance = assignClosestArrayPoint(\n      flatCoordinates, offset, ends, stride,\n      maxDelta, isRing, x, y, closestPoint, minSquaredDistance, tmpPoint);\n    offset = ends[ends.length - 1];\n  }\n  return minSquaredDistance;\n}\n","/**\n * @module ol/geom/flat/deflate\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {import(\"../../coordinate.js\").Coordinate} coordinate Coordinate.\n * @param {number} stride Stride.\n * @return {number} offset Offset.\n */\nexport function deflateCoordinate(flatCoordinates, offset, coordinate, stride) {\n  for (let i = 0, ii = coordinate.length; i < ii; ++i) {\n    flatCoordinates[offset++] = coordinate[i];\n  }\n  return offset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<import(\"../../coordinate.js\").Coordinate>} coordinates Coordinates.\n * @param {number} stride Stride.\n * @return {number} offset Offset.\n */\nexport function deflateCoordinates(flatCoordinates, offset, coordinates, stride) {\n  for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n    const coordinate = coordinates[i];\n    for (let j = 0; j < stride; ++j) {\n      flatCoordinates[offset++] = coordinate[j];\n    }\n  }\n  return offset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<import(\"../../coordinate.js\").Coordinate>>} coordinatess Coordinatess.\n * @param {number} stride Stride.\n * @param {Array<number>=} opt_ends Ends.\n * @return {Array<number>} Ends.\n */\nexport function deflateCoordinatesArray(flatCoordinates, offset, coordinatess, stride, opt_ends) {\n  const ends = opt_ends ? opt_ends : [];\n  let i = 0;\n  for (let j = 0, jj = coordinatess.length; j < jj; ++j) {\n    const end = deflateCoordinates(\n      flatCoordinates, offset, coordinatess[j], stride);\n    ends[i++] = end;\n    offset = end;\n  }\n  ends.length = i;\n  return ends;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<Array<import(\"../../coordinate.js\").Coordinate>>>} coordinatesss Coordinatesss.\n * @param {number} stride Stride.\n * @param {Array<Array<number>>=} opt_endss Endss.\n * @return {Array<Array<number>>} Endss.\n */\nexport function deflateMultiCoordinatesArray(flatCoordinates, offset, coordinatesss, stride, opt_endss) {\n  const endss = opt_endss ? opt_endss : [];\n  let i = 0;\n  for (let j = 0, jj = coordinatesss.length; j < jj; ++j) {\n    const ends = deflateCoordinatesArray(\n      flatCoordinates, offset, coordinatesss[j], stride, endss[i]);\n    endss[i++] = ends;\n    offset = ends[ends.length - 1];\n  }\n  endss.length = i;\n  return endss;\n}\n","/**\n * @module ol/geom/flat/inflate\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {Array<import(\"../../coordinate.js\").Coordinate>=} opt_coordinates Coordinates.\n * @return {Array<import(\"../../coordinate.js\").Coordinate>} Coordinates.\n */\nexport function inflateCoordinates(flatCoordinates, offset, end, stride, opt_coordinates) {\n  const coordinates = opt_coordinates !== undefined ? opt_coordinates : [];\n  let i = 0;\n  for (let j = offset; j < end; j += stride) {\n    coordinates[i++] = flatCoordinates.slice(j, j + stride);\n  }\n  coordinates.length = i;\n  return coordinates;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {Array<Array<import(\"../../coordinate.js\").Coordinate>>=} opt_coordinatess Coordinatess.\n * @return {Array<Array<import(\"../../coordinate.js\").Coordinate>>} Coordinatess.\n */\nexport function inflateCoordinatesArray(flatCoordinates, offset, ends, stride, opt_coordinatess) {\n  const coordinatess = opt_coordinatess !== undefined ? opt_coordinatess : [];\n  let i = 0;\n  for (let j = 0, jj = ends.length; j < jj; ++j) {\n    const end = ends[j];\n    coordinatess[i++] = inflateCoordinates(\n      flatCoordinates, offset, end, stride, coordinatess[i]);\n    offset = end;\n  }\n  coordinatess.length = i;\n  return coordinatess;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {Array<Array<Array<import(\"../../coordinate.js\").Coordinate>>>=} opt_coordinatesss\n *     Coordinatesss.\n * @return {Array<Array<Array<import(\"../../coordinate.js\").Coordinate>>>} Coordinatesss.\n */\nexport function inflateMultiCoordinatesArray(flatCoordinates, offset, endss, stride, opt_coordinatesss) {\n  const coordinatesss = opt_coordinatesss !== undefined ? opt_coordinatesss : [];\n  let i = 0;\n  for (let j = 0, jj = endss.length; j < jj; ++j) {\n    const ends = endss[j];\n    coordinatesss[i++] = inflateCoordinatesArray(\n      flatCoordinates, offset, ends, stride, coordinatesss[i]);\n    offset = ends[ends.length - 1];\n  }\n  coordinatesss.length = i;\n  return coordinatesss;\n}\n","/**\n * @module ol/geom/flat/simplify\n */\n// Based on simplify-js https://github.com/mourner/simplify-js\n// Copyright (c) 2012, Vladimir Agafonkin\n// All rights reserved.\n//\n// Redistribution and use in source and binary forms, with or without\n// modification, are permitted provided that the following conditions are met:\n//\n//    1. Redistributions of source code must retain the above copyright notice,\n//       this list of conditions and the following disclaimer.\n//\n//    2. Redistributions in binary form must reproduce the above copyright\n//       notice, this list of conditions and the following disclaimer in the\n//       documentation and/or other materials provided with the distribution.\n//\n// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS \"AS IS\"\n// AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE\n// IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE\n// ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE\n// LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR\n// CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF\n// SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS\n// INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN\n// CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)\n// ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE\n// POSSIBILITY OF SUCH DAMAGE.\n\nimport {squaredSegmentDistance, squaredDistance} from '../../math.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {boolean} highQuality Highest quality.\n * @param {Array<number>=} opt_simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @return {Array<number>} Simplified line string.\n */\nexport function simplifyLineString(flatCoordinates, offset, end,\n  stride, squaredTolerance, highQuality, opt_simplifiedFlatCoordinates) {\n  const simplifiedFlatCoordinates = opt_simplifiedFlatCoordinates !== undefined ?\n    opt_simplifiedFlatCoordinates : [];\n  if (!highQuality) {\n    end = radialDistance(flatCoordinates, offset, end,\n      stride, squaredTolerance,\n      simplifiedFlatCoordinates, 0);\n    flatCoordinates = simplifiedFlatCoordinates;\n    offset = 0;\n    stride = 2;\n  }\n  simplifiedFlatCoordinates.length = douglasPeucker(\n    flatCoordinates, offset, end, stride, squaredTolerance,\n    simplifiedFlatCoordinates, 0);\n  return simplifiedFlatCoordinates;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @return {number} Simplified offset.\n */\nexport function douglasPeucker(flatCoordinates, offset, end,\n  stride, squaredTolerance, simplifiedFlatCoordinates, simplifiedOffset) {\n  const n = (end - offset) / stride;\n  if (n < 3) {\n    for (; offset < end; offset += stride) {\n      simplifiedFlatCoordinates[simplifiedOffset++] =\n          flatCoordinates[offset];\n      simplifiedFlatCoordinates[simplifiedOffset++] =\n          flatCoordinates[offset + 1];\n    }\n    return simplifiedOffset;\n  }\n  /** @type {Array<number>} */\n  const markers = new Array(n);\n  markers[0] = 1;\n  markers[n - 1] = 1;\n  /** @type {Array<number>} */\n  const stack = [offset, end - stride];\n  let index = 0;\n  while (stack.length > 0) {\n    const last = stack.pop();\n    const first = stack.pop();\n    let maxSquaredDistance = 0;\n    const x1 = flatCoordinates[first];\n    const y1 = flatCoordinates[first + 1];\n    const x2 = flatCoordinates[last];\n    const y2 = flatCoordinates[last + 1];\n    for (let i = first + stride; i < last; i += stride) {\n      const x = flatCoordinates[i];\n      const y = flatCoordinates[i + 1];\n      const squaredDistance = squaredSegmentDistance(\n        x, y, x1, y1, x2, y2);\n      if (squaredDistance > maxSquaredDistance) {\n        index = i;\n        maxSquaredDistance = squaredDistance;\n      }\n    }\n    if (maxSquaredDistance > squaredTolerance) {\n      markers[(index - offset) / stride] = 1;\n      if (first + stride < index) {\n        stack.push(first, index);\n      }\n      if (index + stride < last) {\n        stack.push(index, last);\n      }\n    }\n  }\n  for (let i = 0; i < n; ++i) {\n    if (markers[i]) {\n      simplifiedFlatCoordinates[simplifiedOffset++] =\n          flatCoordinates[offset + i * stride];\n      simplifiedFlatCoordinates[simplifiedOffset++] =\n          flatCoordinates[offset + i * stride + 1];\n    }\n  }\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @param {Array<number>} simplifiedEnds Simplified ends.\n * @return {number} Simplified offset.\n */\nexport function douglasPeuckerArray(flatCoordinates, offset,\n  ends, stride, squaredTolerance, simplifiedFlatCoordinates,\n  simplifiedOffset, simplifiedEnds) {\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    simplifiedOffset = douglasPeucker(\n      flatCoordinates, offset, end, stride, squaredTolerance,\n      simplifiedFlatCoordinates, simplifiedOffset);\n    simplifiedEnds.push(simplifiedOffset);\n    offset = end;\n  }\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @param {Array<Array<number>>} simplifiedEndss Simplified endss.\n * @return {number} Simplified offset.\n */\nexport function douglasPeuckerMultiArray(\n  flatCoordinates, offset, endss, stride, squaredTolerance,\n  simplifiedFlatCoordinates, simplifiedOffset, simplifiedEndss) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    const simplifiedEnds = [];\n    simplifiedOffset = douglasPeuckerArray(\n      flatCoordinates, offset, ends, stride, squaredTolerance,\n      simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds);\n    simplifiedEndss.push(simplifiedEnds);\n    offset = ends[ends.length - 1];\n  }\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @return {number} Simplified offset.\n */\nexport function radialDistance(flatCoordinates, offset, end,\n  stride, squaredTolerance, simplifiedFlatCoordinates, simplifiedOffset) {\n  if (end <= offset + stride) {\n    // zero or one point, no simplification possible, so copy and return\n    for (; offset < end; offset += stride) {\n      simplifiedFlatCoordinates[simplifiedOffset++] = flatCoordinates[offset];\n      simplifiedFlatCoordinates[simplifiedOffset++] =\n          flatCoordinates[offset + 1];\n    }\n    return simplifiedOffset;\n  }\n  let x1 = flatCoordinates[offset];\n  let y1 = flatCoordinates[offset + 1];\n  // copy first point\n  simplifiedFlatCoordinates[simplifiedOffset++] = x1;\n  simplifiedFlatCoordinates[simplifiedOffset++] = y1;\n  let x2 = x1;\n  let y2 = y1;\n  for (offset += stride; offset < end; offset += stride) {\n    x2 = flatCoordinates[offset];\n    y2 = flatCoordinates[offset + 1];\n    if (squaredDistance(x1, y1, x2, y2) > squaredTolerance) {\n      // copy point at offset\n      simplifiedFlatCoordinates[simplifiedOffset++] = x2;\n      simplifiedFlatCoordinates[simplifiedOffset++] = y2;\n      x1 = x2;\n      y1 = y2;\n    }\n  }\n  if (x2 != x1 || y2 != y1) {\n    // copy last point\n    simplifiedFlatCoordinates[simplifiedOffset++] = x2;\n    simplifiedFlatCoordinates[simplifiedOffset++] = y2;\n  }\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {number} value Value.\n * @param {number} tolerance Tolerance.\n * @return {number} Rounded value.\n */\nexport function snap(value, tolerance) {\n  return tolerance * Math.round(value / tolerance);\n}\n\n\n/**\n * Simplifies a line string using an algorithm designed by Tim Schaub.\n * Coordinates are snapped to the nearest value in a virtual grid and\n * consecutive duplicate coordinates are discarded.  This effectively preserves\n * topology as the simplification of any subsection of a line string is\n * independent of the rest of the line string.  This means that, for examples,\n * the common edge between two polygons will be simplified to the same line\n * string independently in both polygons.  This implementation uses a single\n * pass over the coordinates and eliminates intermediate collinear points.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} tolerance Tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @return {number} Simplified offset.\n */\nexport function quantize(flatCoordinates, offset, end, stride,\n  tolerance, simplifiedFlatCoordinates, simplifiedOffset) {\n  // do nothing if the line is empty\n  if (offset == end) {\n    return simplifiedOffset;\n  }\n  // snap the first coordinate (P1)\n  let x1 = snap(flatCoordinates[offset], tolerance);\n  let y1 = snap(flatCoordinates[offset + 1], tolerance);\n  offset += stride;\n  // add the first coordinate to the output\n  simplifiedFlatCoordinates[simplifiedOffset++] = x1;\n  simplifiedFlatCoordinates[simplifiedOffset++] = y1;\n  // find the next coordinate that does not snap to the same value as the first\n  // coordinate (P2)\n  let x2, y2;\n  do {\n    x2 = snap(flatCoordinates[offset], tolerance);\n    y2 = snap(flatCoordinates[offset + 1], tolerance);\n    offset += stride;\n    if (offset == end) {\n      // all coordinates snap to the same value, the line collapses to a point\n      // push the last snapped value anyway to ensure that the output contains\n      // at least two points\n      // FIXME should we really return at least two points anyway?\n      simplifiedFlatCoordinates[simplifiedOffset++] = x2;\n      simplifiedFlatCoordinates[simplifiedOffset++] = y2;\n      return simplifiedOffset;\n    }\n  } while (x2 == x1 && y2 == y1);\n  while (offset < end) {\n    // snap the next coordinate (P3)\n    const x3 = snap(flatCoordinates[offset], tolerance);\n    const y3 = snap(flatCoordinates[offset + 1], tolerance);\n    offset += stride;\n    // skip P3 if it is equal to P2\n    if (x3 == x2 && y3 == y2) {\n      continue;\n    }\n    // calculate the delta between P1 and P2\n    const dx1 = x2 - x1;\n    const dy1 = y2 - y1;\n    // calculate the delta between P3 and P1\n    const dx2 = x3 - x1;\n    const dy2 = y3 - y1;\n    // if P1, P2, and P3 are colinear and P3 is further from P1 than P2 is from\n    // P1 in the same direction then P2 is on the straight line between P1 and\n    // P3\n    if ((dx1 * dy2 == dy1 * dx2) &&\n        ((dx1 < 0 && dx2 < dx1) || dx1 == dx2 || (dx1 > 0 && dx2 > dx1)) &&\n        ((dy1 < 0 && dy2 < dy1) || dy1 == dy2 || (dy1 > 0 && dy2 > dy1))) {\n      // discard P2 and set P2 = P3\n      x2 = x3;\n      y2 = y3;\n      continue;\n    }\n    // either P1, P2, and P3 are not colinear, or they are colinear but P3 is\n    // between P3 and P1 or on the opposite half of the line to P2.  add P2,\n    // and continue with P1 = P2 and P2 = P3\n    simplifiedFlatCoordinates[simplifiedOffset++] = x2;\n    simplifiedFlatCoordinates[simplifiedOffset++] = y2;\n    x1 = x2;\n    y1 = y2;\n    x2 = x3;\n    y2 = y3;\n  }\n  // add the last point (P2)\n  simplifiedFlatCoordinates[simplifiedOffset++] = x2;\n  simplifiedFlatCoordinates[simplifiedOffset++] = y2;\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} tolerance Tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @param {Array<number>} simplifiedEnds Simplified ends.\n * @return {number} Simplified offset.\n */\nexport function quantizeArray(\n  flatCoordinates, offset, ends, stride,\n  tolerance,\n  simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds) {\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    simplifiedOffset = quantize(\n      flatCoordinates, offset, end, stride,\n      tolerance,\n      simplifiedFlatCoordinates, simplifiedOffset);\n    simplifiedEnds.push(simplifiedOffset);\n    offset = end;\n  }\n  return simplifiedOffset;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {number} tolerance Tolerance.\n * @param {Array<number>} simplifiedFlatCoordinates Simplified flat\n *     coordinates.\n * @param {number} simplifiedOffset Simplified offset.\n * @param {Array<Array<number>>} simplifiedEndss Simplified endss.\n * @return {number} Simplified offset.\n */\nexport function quantizeMultiArray(\n  flatCoordinates, offset, endss, stride,\n  tolerance,\n  simplifiedFlatCoordinates, simplifiedOffset, simplifiedEndss) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    const simplifiedEnds = [];\n    simplifiedOffset = quantizeArray(\n      flatCoordinates, offset, ends, stride,\n      tolerance,\n      simplifiedFlatCoordinates, simplifiedOffset, simplifiedEnds);\n    simplifiedEndss.push(simplifiedEnds);\n    offset = ends[ends.length - 1];\n  }\n  return simplifiedOffset;\n}\n","/**\n * @module ol/geom/LinearRing\n */\nimport {closestSquaredDistanceXY} from '../extent.js';\nimport GeometryLayout from './GeometryLayout.js';\nimport GeometryType from './GeometryType.js';\nimport SimpleGeometry from './SimpleGeometry.js';\nimport {linearRing as linearRingArea} from './flat/area.js';\nimport {assignClosestPoint, maxSquaredDelta} from './flat/closest.js';\nimport {deflateCoordinates} from './flat/deflate.js';\nimport {inflateCoordinates} from './flat/inflate.js';\nimport {douglasPeucker} from './flat/simplify.js';\n\n/**\n * @classdesc\n * Linear ring geometry. Only used as part of polygon; cannot be rendered\n * on its own.\n *\n * @api\n */\nclass LinearRing extends SimpleGeometry {\n\n  /**\n   * @param {Array<import(\"../coordinate.js\").Coordinate>|Array<number>} coordinates Coordinates.\n   *     For internal use, flat coordinates in combination with `opt_layout` are also accepted.\n   * @param {GeometryLayout=} opt_layout Layout.\n   */\n  constructor(coordinates, opt_layout) {\n\n    super();\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDelta_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDeltaRevision_ = -1;\n\n    if (opt_layout !== undefined && !Array.isArray(coordinates[0])) {\n      this.setFlatCoordinates(opt_layout, /** @type {Array<number>} */ (coordinates));\n    } else {\n      this.setCoordinates(/** @type {Array<import(\"../coordinate.js\").Coordinate>} */ (coordinates), opt_layout);\n    }\n\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!LinearRing} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    return new LinearRing(this.flatCoordinates.slice(), this.layout);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    if (this.maxDeltaRevision_ != this.getRevision()) {\n      this.maxDelta_ = Math.sqrt(maxSquaredDelta(\n        this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, 0));\n      this.maxDeltaRevision_ = this.getRevision();\n    }\n    return assignClosestPoint(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);\n  }\n\n  /**\n   * Return the area of the linear ring on projected plane.\n   * @return {number} Area (on projected plane).\n   * @api\n   */\n  getArea() {\n    return linearRingArea(this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);\n  }\n\n  /**\n   * Return the coordinates of the linear ring.\n   * @return {Array<import(\"../coordinate.js\").Coordinate>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates() {\n    return inflateCoordinates(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    const simplifiedFlatCoordinates = [];\n    simplifiedFlatCoordinates.length = douglasPeucker(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      squaredTolerance, simplifiedFlatCoordinates, 0);\n    return new LinearRing(simplifiedFlatCoordinates, GeometryLayout.XY);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.LINEAR_RING;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  intersectsExtent(extent) {\n    return false;\n  }\n\n  /**\n   * Set the coordinates of the linear ring.\n   * @param {!Array<import(\"../coordinate.js\").Coordinate>} coordinates Coordinates.\n   * @param {GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 1);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    this.flatCoordinates.length = deflateCoordinates(\n      this.flatCoordinates, 0, coordinates, this.stride);\n    this.changed();\n  }\n}\n\n\nexport default LinearRing;\n","/**\n * @module ol/geom/Point\n */\nimport {createOrUpdateFromCoordinate, containsXY} from '../extent.js';\nimport GeometryType from './GeometryType.js';\nimport SimpleGeometry from './SimpleGeometry.js';\nimport {deflateCoordinate} from './flat/deflate.js';\nimport {squaredDistance as squaredDx} from '../math.js';\n\n/**\n * @classdesc\n * Point geometry.\n *\n * @api\n */\nclass Point extends SimpleGeometry {\n\n  /**\n   * @param {import(\"../coordinate.js\").Coordinate} coordinates Coordinates.\n   * @param {import(\"./GeometryLayout.js\").default=} opt_layout Layout.\n   */\n  constructor(coordinates, opt_layout) {\n    super();\n    this.setCoordinates(coordinates, opt_layout);\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!Point} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    const point = new Point(this.flatCoordinates.slice(), this.layout);\n    return point;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    const flatCoordinates = this.flatCoordinates;\n    const squaredDistance = squaredDx(x, y, flatCoordinates[0], flatCoordinates[1]);\n    if (squaredDistance < minSquaredDistance) {\n      const stride = this.stride;\n      for (let i = 0; i < stride; ++i) {\n        closestPoint[i] = flatCoordinates[i];\n      }\n      closestPoint.length = stride;\n      return squaredDistance;\n    } else {\n      return minSquaredDistance;\n    }\n  }\n\n  /**\n   * Return the coordinate of the point.\n   * @return {import(\"../coordinate.js\").Coordinate} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates() {\n    return !this.flatCoordinates ? [] : this.flatCoordinates.slice();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  computeExtent(extent) {\n    return createOrUpdateFromCoordinate(this.flatCoordinates, extent);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.POINT;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    return containsXY(extent, this.flatCoordinates[0], this.flatCoordinates[1]);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 0);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    this.flatCoordinates.length = deflateCoordinate(\n      this.flatCoordinates, 0, coordinates, this.stride);\n    this.changed();\n  }\n}\n\n\nexport default Point;\n","/**\n * @module ol/geom/flat/contains\n */\nimport {forEachCorner} from '../../extent.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {import(\"../../extent.js\").Extent} extent Extent.\n * @return {boolean} Contains extent.\n */\nexport function linearRingContainsExtent(flatCoordinates, offset, end, stride, extent) {\n  const outside = forEachCorner(extent,\n    /**\n     * @param {import(\"../../coordinate.js\").Coordinate} coordinate Coordinate.\n     * @return {boolean} Contains (x, y).\n     */\n    function(coordinate) {\n      return !linearRingContainsXY(flatCoordinates, offset, end, stride, coordinate[0], coordinate[1]);\n    });\n  return !outside;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} x X.\n * @param {number} y Y.\n * @return {boolean} Contains (x, y).\n */\nexport function linearRingContainsXY(flatCoordinates, offset, end, stride, x, y) {\n  // http://geomalgorithms.com/a03-_inclusion.html\n  // Copyright 2000 softSurfer, 2012 Dan Sunday\n  // This code may be freely used and modified for any purpose\n  // providing that this copyright notice is included with it.\n  // SoftSurfer makes no warranty for this code, and cannot be held\n  // liable for any real or imagined damage resulting from its use.\n  // Users of this code must verify correctness for their application.\n  let wn = 0;\n  let x1 = flatCoordinates[end - stride];\n  let y1 = flatCoordinates[end - stride + 1];\n  for (; offset < end; offset += stride) {\n    const x2 = flatCoordinates[offset];\n    const y2 = flatCoordinates[offset + 1];\n    if (y1 <= y) {\n      if (y2 > y && ((x2 - x1) * (y - y1)) - ((x - x1) * (y2 - y1)) > 0) {\n        wn++;\n      }\n    } else if (y2 <= y && ((x2 - x1) * (y - y1)) - ((x - x1) * (y2 - y1)) < 0) {\n      wn--;\n    }\n    x1 = x2;\n    y1 = y2;\n  }\n  return wn !== 0;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} x X.\n * @param {number} y Y.\n * @return {boolean} Contains (x, y).\n */\nexport function linearRingsContainsXY(flatCoordinates, offset, ends, stride, x, y) {\n  if (ends.length === 0) {\n    return false;\n  }\n  if (!linearRingContainsXY(flatCoordinates, offset, ends[0], stride, x, y)) {\n    return false;\n  }\n  for (let i = 1, ii = ends.length; i < ii; ++i) {\n    if (linearRingContainsXY(flatCoordinates, ends[i - 1], ends[i], stride, x, y)) {\n      return false;\n    }\n  }\n  return true;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {number} x X.\n * @param {number} y Y.\n * @return {boolean} Contains (x, y).\n */\nexport function linearRingssContainsXY(flatCoordinates, offset, endss, stride, x, y) {\n  if (endss.length === 0) {\n    return false;\n  }\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    if (linearRingsContainsXY(flatCoordinates, offset, ends, stride, x, y)) {\n      return true;\n    }\n    offset = ends[ends.length - 1];\n  }\n  return false;\n}\n","/**\n * @module ol/geom/flat/interiorpoint\n */\nimport {numberSafeCompareFunction} from '../../array.js';\nimport {linearRingsContainsXY} from './contains.js';\n\n\n/**\n * Calculates a point that is likely to lie in the interior of the linear rings.\n * Inspired by JTS's com.vividsolutions.jts.geom.Geometry#getInteriorPoint.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {Array<number>} flatCenters Flat centers.\n * @param {number} flatCentersOffset Flat center offset.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Destination point as XYM coordinate, where M is the\n * length of the horizontal intersection that the point belongs to.\n */\nexport function getInteriorPointOfArray(flatCoordinates, offset,\n  ends, stride, flatCenters, flatCentersOffset, opt_dest) {\n  let i, ii, x, x1, x2, y1, y2;\n  const y = flatCenters[flatCentersOffset + 1];\n  /** @type {Array<number>} */\n  const intersections = [];\n  // Calculate intersections with the horizontal line\n  for (let r = 0, rr = ends.length; r < rr; ++r) {\n    const end = ends[r];\n    x1 = flatCoordinates[end - stride];\n    y1 = flatCoordinates[end - stride + 1];\n    for (i = offset; i < end; i += stride) {\n      x2 = flatCoordinates[i];\n      y2 = flatCoordinates[i + 1];\n      if ((y <= y1 && y2 <= y) || (y1 <= y && y <= y2)) {\n        x = (y - y1) / (y2 - y1) * (x2 - x1) + x1;\n        intersections.push(x);\n      }\n      x1 = x2;\n      y1 = y2;\n    }\n  }\n  // Find the longest segment of the horizontal line that has its center point\n  // inside the linear ring.\n  let pointX = NaN;\n  let maxSegmentLength = -Infinity;\n  intersections.sort(numberSafeCompareFunction);\n  x1 = intersections[0];\n  for (i = 1, ii = intersections.length; i < ii; ++i) {\n    x2 = intersections[i];\n    const segmentLength = Math.abs(x2 - x1);\n    if (segmentLength > maxSegmentLength) {\n      x = (x1 + x2) / 2;\n      if (linearRingsContainsXY(flatCoordinates, offset, ends, stride, x, y)) {\n        pointX = x;\n        maxSegmentLength = segmentLength;\n      }\n    }\n    x1 = x2;\n  }\n  if (isNaN(pointX)) {\n    // There is no horizontal line that has its center point inside the linear\n    // ring.  Use the center of the the linear ring's extent.\n    pointX = flatCenters[flatCentersOffset];\n  }\n  if (opt_dest) {\n    opt_dest.push(pointX, y, maxSegmentLength);\n    return opt_dest;\n  } else {\n    return [pointX, y, maxSegmentLength];\n  }\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {Array<number>} flatCenters Flat centers.\n * @return {Array<number>} Interior points as XYM coordinates, where M is the\n * length of the horizontal intersection that the point belongs to.\n */\nexport function getInteriorPointsOfMultiArray(flatCoordinates, offset, endss, stride, flatCenters) {\n  let interiorPoints = [];\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    interiorPoints = getInteriorPointOfArray(flatCoordinates,\n      offset, ends, stride, flatCenters, 2 * i, interiorPoints);\n    offset = ends[ends.length - 1];\n  }\n  return interiorPoints;\n}\n","/**\n * @module ol/geom/flat/segments\n */\n\n\n/**\n * This function calls `callback` for each segment of the flat coordinates\n * array. If the callback returns a truthy value the function returns that\n * value immediately. Otherwise the function returns `false`.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {function(this: S, import(\"../../coordinate.js\").Coordinate, import(\"../../coordinate.js\").Coordinate): T} callback Function\n *     called for each segment.\n * @param {S=} opt_this The object to be used as the value of 'this'\n *     within callback.\n * @return {T|boolean} Value.\n * @template T,S\n */\nexport function forEach(flatCoordinates, offset, end, stride, callback, opt_this) {\n  const point1 = [flatCoordinates[offset], flatCoordinates[offset + 1]];\n  const point2 = [];\n  let ret;\n  for (; (offset + stride) < end; offset += stride) {\n    point2[0] = flatCoordinates[offset + stride];\n    point2[1] = flatCoordinates[offset + stride + 1];\n    ret = callback.call(opt_this, point1, point2);\n    if (ret) {\n      return ret;\n    }\n    point1[0] = point2[0];\n    point1[1] = point2[1];\n  }\n  return false;\n}\n","/**\n * @module ol/geom/flat/intersectsextent\n */\nimport {containsExtent, createEmpty, extendFlatCoordinates, intersects, intersectsSegment} from '../../extent.js';\nimport {linearRingContainsXY, linearRingContainsExtent} from './contains.js';\nimport {forEach as forEachSegment} from './segments.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {import(\"../../extent.js\").Extent} extent Extent.\n * @return {boolean} True if the geometry and the extent intersect.\n */\nexport function intersectsLineString(flatCoordinates, offset, end, stride, extent) {\n  const coordinatesExtent = extendFlatCoordinates(\n    createEmpty(), flatCoordinates, offset, end, stride);\n  if (!intersects(extent, coordinatesExtent)) {\n    return false;\n  }\n  if (containsExtent(extent, coordinatesExtent)) {\n    return true;\n  }\n  if (coordinatesExtent[0] >= extent[0] &&\n      coordinatesExtent[2] <= extent[2]) {\n    return true;\n  }\n  if (coordinatesExtent[1] >= extent[1] &&\n      coordinatesExtent[3] <= extent[3]) {\n    return true;\n  }\n  return forEachSegment(flatCoordinates, offset, end, stride,\n    /**\n     * @param {import(\"../../coordinate.js\").Coordinate} point1 Start point.\n     * @param {import(\"../../coordinate.js\").Coordinate} point2 End point.\n     * @return {boolean} `true` if the segment and the extent intersect,\n     *     `false` otherwise.\n     */\n    function(point1, point2) {\n      return intersectsSegment(extent, point1, point2);\n    });\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {import(\"../../extent.js\").Extent} extent Extent.\n * @return {boolean} True if the geometry and the extent intersect.\n */\nexport function intersectsLineStringArray(flatCoordinates, offset, ends, stride, extent) {\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    if (intersectsLineString(\n      flatCoordinates, offset, ends[i], stride, extent)) {\n      return true;\n    }\n    offset = ends[i];\n  }\n  return false;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {import(\"../../extent.js\").Extent} extent Extent.\n * @return {boolean} True if the geometry and the extent intersect.\n */\nexport function intersectsLinearRing(flatCoordinates, offset, end, stride, extent) {\n  if (intersectsLineString(\n    flatCoordinates, offset, end, stride, extent)) {\n    return true;\n  }\n  if (linearRingContainsXY(flatCoordinates, offset, end, stride, extent[0], extent[1])) {\n    return true;\n  }\n  if (linearRingContainsXY(flatCoordinates, offset, end, stride, extent[0], extent[3])) {\n    return true;\n  }\n  if (linearRingContainsXY(flatCoordinates, offset, end, stride, extent[2], extent[1])) {\n    return true;\n  }\n  if (linearRingContainsXY(flatCoordinates, offset, end, stride, extent[2], extent[3])) {\n    return true;\n  }\n  return false;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {import(\"../../extent.js\").Extent} extent Extent.\n * @return {boolean} True if the geometry and the extent intersect.\n */\nexport function intersectsLinearRingArray(flatCoordinates, offset, ends, stride, extent) {\n  if (!intersectsLinearRing(\n    flatCoordinates, offset, ends[0], stride, extent)) {\n    return false;\n  }\n  if (ends.length === 1) {\n    return true;\n  }\n  for (let i = 1, ii = ends.length; i < ii; ++i) {\n    if (linearRingContainsExtent(flatCoordinates, ends[i - 1], ends[i], stride, extent)) {\n      if (!intersectsLineString(flatCoordinates, ends[i - 1], ends[i], stride, extent)) {\n        return false;\n      }\n    }\n  }\n  return true;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @param {import(\"../../extent.js\").Extent} extent Extent.\n * @return {boolean} True if the geometry and the extent intersect.\n */\nexport function intersectsLinearRingMultiArray(flatCoordinates, offset, endss, stride, extent) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    if (intersectsLinearRingArray(\n      flatCoordinates, offset, ends, stride, extent)) {\n      return true;\n    }\n    offset = ends[ends.length - 1];\n  }\n  return false;\n}\n","/**\n * @module ol/geom/flat/reverse\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n */\nexport function coordinates(flatCoordinates, offset, end, stride) {\n  while (offset < end - stride) {\n    for (let i = 0; i < stride; ++i) {\n      const tmp = flatCoordinates[offset + i];\n      flatCoordinates[offset + i] = flatCoordinates[end - stride + i];\n      flatCoordinates[end - stride + i] = tmp;\n    }\n    offset += stride;\n    end -= stride;\n  }\n}\n","/**\n * @module ol/geom/flat/orient\n */\nimport {coordinates as reverseCoordinates} from './reverse.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {boolean} Is clockwise.\n */\nexport function linearRingIsClockwise(flatCoordinates, offset, end, stride) {\n  // http://tinyurl.com/clockwise-method\n  // https://github.com/OSGeo/gdal/blob/trunk/gdal/ogr/ogrlinearring.cpp\n  let edge = 0;\n  let x1 = flatCoordinates[end - stride];\n  let y1 = flatCoordinates[end - stride + 1];\n  for (; offset < end; offset += stride) {\n    const x2 = flatCoordinates[offset];\n    const y2 = flatCoordinates[offset + 1];\n    edge += (x2 - x1) * (y2 + y1);\n    x1 = x2;\n    y1 = y2;\n  }\n  return edge > 0;\n}\n\n\n/**\n * Determines if linear rings are oriented.  By default, left-hand orientation\n * is tested (first ring must be clockwise, remaining rings counter-clockwise).\n * To test for right-hand orientation, use the `opt_right` argument.\n *\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Array of end indexes.\n * @param {number} stride Stride.\n * @param {boolean=} opt_right Test for right-hand orientation\n *     (counter-clockwise exterior ring and clockwise interior rings).\n * @return {boolean} Rings are correctly oriented.\n */\nexport function linearRingIsOriented(flatCoordinates, offset, ends, stride, opt_right) {\n  const right = opt_right !== undefined ? opt_right : false;\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    const isClockwise = linearRingIsClockwise(\n      flatCoordinates, offset, end, stride);\n    if (i === 0) {\n      if ((right && isClockwise) || (!right && !isClockwise)) {\n        return false;\n      }\n    } else {\n      if ((right && !isClockwise) || (!right && isClockwise)) {\n        return false;\n      }\n    }\n    offset = end;\n  }\n  return true;\n}\n\n\n/**\n * Determines if linear rings are oriented.  By default, left-hand orientation\n * is tested (first ring must be clockwise, remaining rings counter-clockwise).\n * To test for right-hand orientation, use the `opt_right` argument.\n *\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Array of array of end indexes.\n * @param {number} stride Stride.\n * @param {boolean=} opt_right Test for right-hand orientation\n *     (counter-clockwise exterior ring and clockwise interior rings).\n * @return {boolean} Rings are correctly oriented.\n */\nexport function linearRingsAreOriented(flatCoordinates, offset, endss, stride, opt_right) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    if (!linearRingIsOriented(\n      flatCoordinates, offset, endss[i], stride, opt_right)) {\n      return false;\n    }\n  }\n  return true;\n}\n\n\n/**\n * Orient coordinates in a flat array of linear rings.  By default, rings\n * are oriented following the left-hand rule (clockwise for exterior and\n * counter-clockwise for interior rings).  To orient according to the\n * right-hand rule, use the `opt_right` argument.\n *\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {boolean=} opt_right Follow the right-hand rule for orientation.\n * @return {number} End.\n */\nexport function orientLinearRings(flatCoordinates, offset, ends, stride, opt_right) {\n  const right = opt_right !== undefined ? opt_right : false;\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    const isClockwise = linearRingIsClockwise(\n      flatCoordinates, offset, end, stride);\n    const reverse = i === 0 ?\n      (right && isClockwise) || (!right && !isClockwise) :\n      (right && !isClockwise) || (!right && isClockwise);\n    if (reverse) {\n      reverseCoordinates(flatCoordinates, offset, end, stride);\n    }\n    offset = end;\n  }\n  return offset;\n}\n\n\n/**\n * Orient coordinates in a flat array of linear rings.  By default, rings\n * are oriented following the left-hand rule (clockwise for exterior and\n * counter-clockwise for interior rings).  To orient according to the\n * right-hand rule, use the `opt_right` argument.\n *\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Array of array of end indexes.\n * @param {number} stride Stride.\n * @param {boolean=} opt_right Follow the right-hand rule for orientation.\n * @return {number} End.\n */\nexport function orientLinearRingsArray(flatCoordinates, offset, endss, stride, opt_right) {\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    offset = orientLinearRings(\n      flatCoordinates, offset, endss[i], stride, opt_right);\n  }\n  return offset;\n}\n","/**\n * @module ol/geom/Polygon\n */\nimport {extend} from '../array.js';\nimport {closestSquaredDistanceXY, getCenter} from '../extent.js';\nimport GeometryLayout from './GeometryLayout.js';\nimport GeometryType from './GeometryType.js';\nimport LinearRing from './LinearRing.js';\nimport Point from './Point.js';\nimport SimpleGeometry from './SimpleGeometry.js';\nimport {offset as sphereOffset} from '../sphere.js';\nimport {linearRings as linearRingsArea} from './flat/area.js';\nimport {assignClosestArrayPoint, arrayMaxSquaredDelta} from './flat/closest.js';\nimport {linearRingsContainsXY} from './flat/contains.js';\nimport {deflateCoordinatesArray} from './flat/deflate.js';\nimport {inflateCoordinatesArray} from './flat/inflate.js';\nimport {getInteriorPointOfArray} from './flat/interiorpoint.js';\nimport {intersectsLinearRingArray} from './flat/intersectsextent.js';\nimport {linearRingIsOriented, orientLinearRings} from './flat/orient.js';\nimport {quantizeArray} from './flat/simplify.js';\nimport {modulo} from '../math.js';\n\n/**\n * @classdesc\n * Polygon geometry.\n *\n * @api\n */\nclass Polygon extends SimpleGeometry {\n\n  /**\n   * @param {!Array<Array<import(\"../coordinate.js\").Coordinate>>|!Array<number>} coordinates\n   *     Array of linear rings that define the polygon. The first linear ring of the\n   *     array defines the outer-boundary or surface of the polygon. Each subsequent\n   *     linear ring defines a hole in the surface of the polygon. A linear ring is\n   *     an array of vertices' coordinates where the first coordinate and the last are\n   *     equivalent. (For internal use, flat coordinates in combination with\n   *     `opt_layout` and `opt_ends` are also accepted.)\n   * @param {GeometryLayout=} opt_layout Layout.\n   * @param {Array<number>=} opt_ends Ends (for internal use with flat coordinates).\n   */\n  constructor(coordinates, opt_layout, opt_ends) {\n\n    super();\n\n    /**\n     * @type {Array<number>}\n     * @private\n     */\n    this.ends_ = [];\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.flatInteriorPointRevision_ = -1;\n\n    /**\n     * @private\n     * @type {import(\"../coordinate.js\").Coordinate}\n     */\n    this.flatInteriorPoint_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDelta_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDeltaRevision_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.orientedRevision_ = -1;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.orientedFlatCoordinates_ = null;\n\n    if (opt_layout !== undefined && opt_ends) {\n      this.setFlatCoordinates(opt_layout, /** @type {Array<number>} */ (coordinates));\n      this.ends_ = opt_ends;\n    } else {\n      this.setCoordinates(/** @type {Array<Array<import(\"../coordinate.js\").Coordinate>>} */ (coordinates), opt_layout);\n    }\n\n  }\n\n  /**\n   * Append the passed linear ring to this polygon.\n   * @param {LinearRing} linearRing Linear ring.\n   * @api\n   */\n  appendLinearRing(linearRing) {\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = linearRing.getFlatCoordinates().slice();\n    } else {\n      extend(this.flatCoordinates, linearRing.getFlatCoordinates());\n    }\n    this.ends_.push(this.flatCoordinates.length);\n    this.changed();\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!Polygon} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    return new Polygon(this.flatCoordinates.slice(), this.layout, this.ends_.slice());\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    if (this.maxDeltaRevision_ != this.getRevision()) {\n      this.maxDelta_ = Math.sqrt(arrayMaxSquaredDelta(\n        this.flatCoordinates, 0, this.ends_, this.stride, 0));\n      this.maxDeltaRevision_ = this.getRevision();\n    }\n    return assignClosestArrayPoint(\n      this.flatCoordinates, 0, this.ends_, this.stride,\n      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  containsXY(x, y) {\n    return linearRingsContainsXY(this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride, x, y);\n  }\n\n  /**\n   * Return the area of the polygon on projected plane.\n   * @return {number} Area (on projected plane).\n   * @api\n   */\n  getArea() {\n    return linearRingsArea(this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride);\n  }\n\n  /**\n   * Get the coordinate array for this geometry.  This array has the structure\n   * of a GeoJSON coordinate array for polygons.\n   *\n   * @param {boolean=} opt_right Orient coordinates according to the right-hand\n   *     rule (counter-clockwise for exterior and clockwise for interior rings).\n   *     If `false`, coordinates will be oriented according to the left-hand rule\n   *     (clockwise for exterior and counter-clockwise for interior rings).\n   *     By default, coordinate orientation will depend on how the geometry was\n   *     constructed.\n   * @return {Array<Array<import(\"../coordinate.js\").Coordinate>>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates(opt_right) {\n    let flatCoordinates;\n    if (opt_right !== undefined) {\n      flatCoordinates = this.getOrientedFlatCoordinates().slice();\n      orientLinearRings(\n        flatCoordinates, 0, this.ends_, this.stride, opt_right);\n    } else {\n      flatCoordinates = this.flatCoordinates;\n    }\n\n    return inflateCoordinatesArray(\n      flatCoordinates, 0, this.ends_, this.stride);\n  }\n\n  /**\n   * @return {Array<number>} Ends.\n   */\n  getEnds() {\n    return this.ends_;\n  }\n\n  /**\n   * @return {Array<number>} Interior point.\n   */\n  getFlatInteriorPoint() {\n    if (this.flatInteriorPointRevision_ != this.getRevision()) {\n      const flatCenter = getCenter(this.getExtent());\n      this.flatInteriorPoint_ = getInteriorPointOfArray(\n        this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride,\n        flatCenter, 0);\n      this.flatInteriorPointRevision_ = this.getRevision();\n    }\n    return this.flatInteriorPoint_;\n  }\n\n  /**\n   * Return an interior point of the polygon.\n   * @return {Point} Interior point as XYM coordinate, where M is the\n   * length of the horizontal intersection that the point belongs to.\n   * @api\n   */\n  getInteriorPoint() {\n    return new Point(this.getFlatInteriorPoint(), GeometryLayout.XYM);\n  }\n\n  /**\n   * Return the number of rings of the polygon,  this includes the exterior\n   * ring and any interior rings.\n   *\n   * @return {number} Number of rings.\n   * @api\n   */\n  getLinearRingCount() {\n    return this.ends_.length;\n  }\n\n  /**\n   * Return the Nth linear ring of the polygon geometry. Return `null` if the\n   * given index is out of range.\n   * The exterior linear ring is available at index `0` and the interior rings\n   * at index `1` and beyond.\n   *\n   * @param {number} index Index.\n   * @return {LinearRing} Linear ring.\n   * @api\n   */\n  getLinearRing(index) {\n    if (index < 0 || this.ends_.length <= index) {\n      return null;\n    }\n    return new LinearRing(this.flatCoordinates.slice(\n      index === 0 ? 0 : this.ends_[index - 1], this.ends_[index]), this.layout);\n  }\n\n  /**\n   * Return the linear rings of the polygon.\n   * @return {Array<LinearRing>} Linear rings.\n   * @api\n   */\n  getLinearRings() {\n    const layout = this.layout;\n    const flatCoordinates = this.flatCoordinates;\n    const ends = this.ends_;\n    const linearRings = [];\n    let offset = 0;\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      const end = ends[i];\n      const linearRing = new LinearRing(flatCoordinates.slice(offset, end), layout);\n      linearRings.push(linearRing);\n      offset = end;\n    }\n    return linearRings;\n  }\n\n  /**\n   * @return {Array<number>} Oriented flat coordinates.\n   */\n  getOrientedFlatCoordinates() {\n    if (this.orientedRevision_ != this.getRevision()) {\n      const flatCoordinates = this.flatCoordinates;\n      if (linearRingIsOriented(\n        flatCoordinates, 0, this.ends_, this.stride)) {\n        this.orientedFlatCoordinates_ = flatCoordinates;\n      } else {\n        this.orientedFlatCoordinates_ = flatCoordinates.slice();\n        this.orientedFlatCoordinates_.length =\n            orientLinearRings(\n              this.orientedFlatCoordinates_, 0, this.ends_, this.stride);\n      }\n      this.orientedRevision_ = this.getRevision();\n    }\n    return this.orientedFlatCoordinates_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    const simplifiedFlatCoordinates = [];\n    const simplifiedEnds = [];\n    simplifiedFlatCoordinates.length = quantizeArray(\n      this.flatCoordinates, 0, this.ends_, this.stride,\n      Math.sqrt(squaredTolerance),\n      simplifiedFlatCoordinates, 0, simplifiedEnds);\n    return new Polygon(simplifiedFlatCoordinates, GeometryLayout.XY, simplifiedEnds);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.POLYGON;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    return intersectsLinearRingArray(\n      this.getOrientedFlatCoordinates(), 0, this.ends_, this.stride, extent);\n  }\n\n  /**\n   * Set the coordinates of the polygon.\n   * @param {!Array<Array<import(\"../coordinate.js\").Coordinate>>} coordinates Coordinates.\n   * @param {GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 2);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    const ends = deflateCoordinatesArray(\n      this.flatCoordinates, 0, coordinates, this.stride, this.ends_);\n    this.flatCoordinates.length = ends.length === 0 ? 0 : ends[ends.length - 1];\n    this.changed();\n  }\n}\n\n\nexport default Polygon;\n\n\n/**\n * Create an approximation of a circle on the surface of a sphere.\n * @param {import(\"../coordinate.js\").Coordinate} center Center (`[lon, lat]` in degrees).\n * @param {number} radius The great-circle distance from the center to\n *     the polygon vertices.\n * @param {number=} opt_n Optional number of vertices for the resulting\n *     polygon. Default is `32`.\n * @param {number=} opt_sphereRadius Optional radius for the sphere (defaults to\n *     the Earth's mean radius using the WGS84 ellipsoid).\n * @return {Polygon} The \"circular\" polygon.\n * @api\n */\nexport function circular(center, radius, opt_n, opt_sphereRadius) {\n  const n = opt_n ? opt_n : 32;\n  /** @type {Array<number>} */\n  const flatCoordinates = [];\n  for (let i = 0; i < n; ++i) {\n    extend(flatCoordinates, sphereOffset(center, radius, 2 * Math.PI * i / n, opt_sphereRadius));\n  }\n  flatCoordinates.push(flatCoordinates[0], flatCoordinates[1]);\n  return new Polygon(flatCoordinates, GeometryLayout.XY, [flatCoordinates.length]);\n}\n\n\n/**\n * Create a polygon from an extent. The layout used is `XY`.\n * @param {import(\"../extent.js\").Extent} extent The extent.\n * @return {Polygon} The polygon.\n * @api\n */\nexport function fromExtent(extent) {\n  const minX = extent[0];\n  const minY = extent[1];\n  const maxX = extent[2];\n  const maxY = extent[3];\n  const flatCoordinates =\n      [minX, minY, minX, maxY, maxX, maxY, maxX, minY, minX, minY];\n  return new Polygon(flatCoordinates, GeometryLayout.XY, [flatCoordinates.length]);\n}\n\n\n/**\n * Create a regular polygon from a circle.\n * @param {import(\"./Circle.js\").default} circle Circle geometry.\n * @param {number=} opt_sides Number of sides of the polygon. Default is 32.\n * @param {number=} opt_angle Start angle for the first vertex of the polygon in\n *     radians. Default is 0.\n * @return {Polygon} Polygon geometry.\n * @api\n */\nexport function fromCircle(circle, opt_sides, opt_angle) {\n  const sides = opt_sides ? opt_sides : 32;\n  const stride = circle.getStride();\n  const layout = circle.getLayout();\n  const center = circle.getCenter();\n  const arrayLength = stride * (sides + 1);\n  const flatCoordinates = new Array(arrayLength);\n  for (let i = 0; i < arrayLength; i += stride) {\n    flatCoordinates[i] = 0;\n    flatCoordinates[i + 1] = 0;\n    for (let j = 2; j < stride; j++) {\n      flatCoordinates[i + j] = center[j];\n    }\n  }\n  const ends = [flatCoordinates.length];\n  const polygon = new Polygon(flatCoordinates, layout, ends);\n  makeRegular(polygon, center, circle.getRadius(), opt_angle);\n  return polygon;\n}\n\n\n/**\n * Modify the coordinates of a polygon to make it a regular polygon.\n * @param {Polygon} polygon Polygon geometry.\n * @param {import(\"../coordinate.js\").Coordinate} center Center of the regular polygon.\n * @param {number} radius Radius of the regular polygon.\n * @param {number=} opt_angle Start angle for the first vertex of the polygon in\n *     radians. Default is 0.\n */\nexport function makeRegular(polygon, center, radius, opt_angle) {\n  const flatCoordinates = polygon.getFlatCoordinates();\n  const stride = polygon.getStride();\n  const sides = flatCoordinates.length / stride - 1;\n  const startAngle = opt_angle ? opt_angle : 0;\n  for (let i = 0; i <= sides; ++i) {\n    const offset = i * stride;\n    const angle = startAngle + (modulo(i, sides) * 2 * Math.PI / sides);\n    flatCoordinates[offset] = center[0] + (radius * Math.cos(angle));\n    flatCoordinates[offset + 1] = center[1] + (radius * Math.sin(angle));\n  }\n  polygon.changed();\n}\n","/**\n * @module ol/View\n */\nimport {DEFAULT_TILE_SIZE} from './tilegrid/common.js';\nimport {getUid} from './util.js';\nimport {VOID} from './functions.js';\nimport {createExtent, none as centerNone} from './centerconstraint.js';\nimport BaseObject from './Object.js';\nimport {createSnapToResolutions, createSnapToPower} from './resolutionconstraint.js';\nimport {createSnapToZero, createSnapToN, none as rotationNone, disable} from './rotationconstraint.js';\nimport ViewHint from './ViewHint.js';\nimport ViewProperty from './ViewProperty.js';\nimport {linearFindNearest} from './array.js';\nimport {assert} from './asserts.js';\nimport {add as addCoordinate, rotate as rotateCoordinate, equals as coordinatesEqual} from './coordinate.js';\nimport {inAndOut} from './easing.js';\nimport {getForViewAndSize, getCenter, getHeight, getWidth, isEmpty} from './extent.js';\nimport GeometryType from './geom/GeometryType.js';\nimport {fromExtent as polygonFromExtent} from './geom/Polygon.js';\nimport {clamp, modulo} from './math.js';\nimport {assign} from './obj.js';\nimport {createProjection, METERS_PER_UNIT} from './proj.js';\nimport Units from './proj/Units.js';\n\n\n/**\n * An animation configuration\n *\n * @typedef {Object} Animation\n * @property {import(\"./coordinate.js\").Coordinate} [sourceCenter]\n * @property {import(\"./coordinate.js\").Coordinate} [targetCenter]\n * @property {number} [sourceResolution]\n * @property {number} [targetResolution]\n * @property {number} [sourceRotation]\n * @property {number} [targetRotation]\n * @property {import(\"./coordinate.js\").Coordinate} [anchor]\n * @property {number} start\n * @property {number} duration\n * @property {boolean} complete\n * @property {function(number):number} easing\n * @property {function(boolean)} callback\n */\n\n\n/**\n * @typedef {Object} Constraints\n * @property {import(\"./centerconstraint.js\").Type} center\n * @property {import(\"./resolutionconstraint.js\").Type} resolution\n * @property {import(\"./rotationconstraint.js\").Type} rotation\n */\n\n\n/**\n * @typedef {Object} FitOptions\n * @property {import(\"./size.js\").Size} [size] The size in pixels of the box to fit\n * the extent into. Default is the current size of the first map in the DOM that\n * uses this view, or `[100, 100]` if no such map is found.\n * @property {!Array<number>} [padding=[0, 0, 0, 0]] Padding (in pixels) to be\n * cleared inside the view. Values in the array are top, right, bottom and left\n * padding.\n * @property {boolean} [constrainResolution=true] Constrain the resolution.\n * @property {boolean} [nearest=false] If `constrainResolution` is `true`, get\n * the nearest extent instead of the closest that actually fits the view.\n * @property {number} [minResolution=0] Minimum resolution that we zoom to.\n * @property {number} [maxZoom] Maximum zoom level that we zoom to. If\n * `minResolution` is given, this property is ignored.\n * @property {number} [duration] The duration of the animation in milliseconds.\n * By default, there is no animation to the target extent.\n * @property {function(number):number} [easing] The easing function used during\n * the animation (defaults to {@link module:ol/easing~inAndOut}).\n * The function will be called for each frame with a number representing a\n * fraction of the animation's duration.  The function should return a number\n * between 0 and 1 representing the progress toward the destination state.\n * @property {function(boolean)} [callback] Function called when the view is in\n * its final position. The callback will be called with `true` if the animation\n * series completed on its own or `false` if it was cancelled.\n */\n\n\n/**\n * @typedef {Object} ViewOptions\n * @property {import(\"./coordinate.js\").Coordinate} [center] The initial center for\n * the view. The coordinate system for the center is specified with the\n * `projection` option. Layer sources will not be fetched if this is not set,\n * but the center can be set later with {@link #setCenter}.\n * @property {boolean|number} [constrainRotation=true] Rotation constraint.\n * `false` means no constraint. `true` means no constraint, but snap to zero\n * near zero. A number constrains the rotation to that number of values. For\n * example, `4` will constrain the rotation to 0, 90, 180, and 270 degrees.\n * @property {boolean} [enableRotation=true] Enable rotation.\n * If `false`, a rotation constraint that always sets the rotation to zero is\n * used. The `constrainRotation` option has no effect if `enableRotation` is\n * `false`.\n * @property {import(\"./extent.js\").Extent} [extent] The extent that constrains the\n * center, in other words, center cannot be set outside this extent.\n * @property {number} [maxResolution] The maximum resolution used to determine\n * the resolution constraint. It is used together with `minResolution` (or\n * `maxZoom`) and `zoomFactor`. If unspecified it is calculated in such a way\n * that the projection's validity extent fits in a 256x256 px tile. If the\n * projection is Spherical Mercator (the default) then `maxResolution` defaults\n * to `40075016.68557849 / 256 = 156543.03392804097`.\n * @property {number} [minResolution] The minimum resolution used to determine\n * the resolution constraint.  It is used together with `maxResolution` (or\n * `minZoom`) and `zoomFactor`.  If unspecified it is calculated assuming 29\n * zoom levels (with a factor of 2). If the projection is Spherical Mercator\n * (the default) then `minResolution` defaults to\n * `40075016.68557849 / 256 / Math.pow(2, 28) = 0.0005831682455839253`.\n * @property {number} [maxZoom=28] The maximum zoom level used to determine the\n * resolution constraint. It is used together with `minZoom` (or\n * `maxResolution`) and `zoomFactor`.  Note that if `minResolution` is also\n * provided, it is given precedence over `maxZoom`.\n * @property {number} [minZoom=0] The minimum zoom level used to determine the\n * resolution constraint. It is used together with `maxZoom` (or\n * `minResolution`) and `zoomFactor`.  Note that if `maxResolution` is also\n * provided, it is given precedence over `minZoom`.\n * @property {import(\"./proj.js\").ProjectionLike} [projection='EPSG:3857'] The\n * projection. The default is Spherical Mercator.\n * @property {number} [resolution] The initial resolution for the view. The\n * units are `projection` units per pixel (e.g. meters per pixel). An\n * alternative to setting this is to set `zoom`. Layer sources will not be\n * fetched if neither this nor `zoom` are defined, but they can be set later\n * with {@link #setZoom} or {@link #setResolution}.\n * @property {Array<number>} [resolutions] Resolutions to determine the\n * resolution constraint. If set the `maxResolution`, `minResolution`,\n * `minZoom`, `maxZoom`, and `zoomFactor` options are ignored.\n * @property {number} [rotation=0] The initial rotation for the view in radians\n * (positive rotation clockwise, 0 means North).\n * @property {number} [zoom] Only used if `resolution` is not defined. Zoom\n * level used to calculate the initial resolution for the view. The initial\n * resolution is determined using the {@link #constrainResolution} method.\n * @property {number} [zoomFactor=2] The zoom factor used to determine the\n * resolution constraint.\n */\n\n\n/**\n * @typedef {Object} AnimationOptions\n * @property {import(\"./coordinate.js\").Coordinate} [center] The center of the view at the end of\n * the animation.\n * @property {number} [zoom] The zoom level of the view at the end of the\n * animation. This takes precedence over `resolution`.\n * @property {number} [resolution] The resolution of the view at the end\n * of the animation.  If `zoom` is also provided, this option will be ignored.\n * @property {number} [rotation] The rotation of the view at the end of\n * the animation.\n * @property {import(\"./coordinate.js\").Coordinate} [anchor] Optional anchor to remained fixed\n * during a rotation or resolution animation.\n * @property {number} [duration=1000] The duration of the animation in milliseconds.\n * @property {function(number):number} [easing] The easing function used\n * during the animation (defaults to {@link module:ol/easing~inAndOut}).\n * The function will be called for each frame with a number representing a\n * fraction of the animation's duration.  The function should return a number\n * between 0 and 1 representing the progress toward the destination state.\n */\n\n\n/**\n * @typedef {Object} State\n * @property {import(\"./coordinate.js\").Coordinate} center\n * @property {import(\"./proj/Projection.js\").default} projection\n * @property {number} resolution\n * @property {number} rotation\n * @property {number} zoom\n */\n\n\n/**\n * Default min zoom level for the map view.\n * @type {number}\n */\nconst DEFAULT_MIN_ZOOM = 0;\n\n\n/**\n * @classdesc\n * A View object represents a simple 2D view of the map.\n *\n * This is the object to act upon to change the center, resolution,\n * and rotation of the map.\n *\n * ### The view states\n *\n * An View is determined by three states: `center`, `resolution`,\n * and `rotation`. Each state has a corresponding getter and setter, e.g.\n * `getCenter` and `setCenter` for the `center` state.\n *\n * An View has a `projection`. The projection determines the\n * coordinate system of the center, and its units determine the units of the\n * resolution (projection units per pixel). The default projection is\n * Spherical Mercator (EPSG:3857).\n *\n * ### The constraints\n *\n * `setCenter`, `setResolution` and `setRotation` can be used to change the\n * states of the view. Any value can be passed to the setters. And the value\n * that is passed to a setter will effectively be the value set in the view,\n * and returned by the corresponding getter.\n *\n * But a View object also has a *resolution constraint*, a\n * *rotation constraint* and a *center constraint*.\n *\n * As said above, no constraints are applied when the setters are used to set\n * new states for the view. Applying constraints is done explicitly through\n * the use of the `constrain*` functions (`constrainResolution` and\n * `constrainRotation` and `constrainCenter`).\n *\n * The main users of the constraints are the interactions and the\n * controls. For example, double-clicking on the map changes the view to\n * the \"next\" resolution. And releasing the fingers after pinch-zooming\n * snaps to the closest resolution (with an animation).\n *\n * The *resolution constraint* snaps to specific resolutions. It is\n * determined by the following options: `resolutions`, `maxResolution`,\n * `maxZoom`, and `zoomFactor`. If `resolutions` is set, the other three\n * options are ignored. See documentation for each option for more\n * information.\n *\n * The *rotation constraint* snaps to specific angles. It is determined\n * by the following options: `enableRotation` and `constrainRotation`.\n * By default the rotation value is snapped to zero when approaching the\n * horizontal.\n *\n * The *center constraint* is determined by the `extent` option. By\n * default the center is not constrained at all.\n *\n  * @api\n */\nclass View extends BaseObject {\n\n  /**\n   * @param {ViewOptions=} opt_options View options.\n   */\n  constructor(opt_options) {\n    super();\n\n    const options = assign({}, opt_options);\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.hints_ = [0, 0];\n\n    /**\n     * @private\n     * @type {Array<Array<Animation>>}\n     */\n    this.animations_ = [];\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.updateAnimationKey_;\n\n    this.updateAnimations_ = this.updateAnimations_.bind(this);\n\n    /**\n     * @private\n     * @const\n     * @type {import(\"./proj/Projection.js\").default}\n     */\n    this.projection_ = createProjection(options.projection, 'EPSG:3857');\n\n    this.applyOptions_(options);\n  }\n\n  /**\n   * Set up the view with the given options.\n   * @param {ViewOptions} options View options.\n   */\n  applyOptions_(options) {\n\n    /**\n     * @type {Object<string, *>}\n     */\n    const properties = {};\n    properties[ViewProperty.CENTER] = options.center !== undefined ?\n      options.center : null;\n\n    const resolutionConstraintInfo = createResolutionConstraint(options);\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxResolution_ = resolutionConstraintInfo.maxResolution;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.minResolution_ = resolutionConstraintInfo.minResolution;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.zoomFactor_ = resolutionConstraintInfo.zoomFactor;\n\n    /**\n     * @private\n     * @type {Array<number>|undefined}\n     */\n    this.resolutions_ = options.resolutions;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.minZoom_ = resolutionConstraintInfo.minZoom;\n\n    const centerConstraint = createCenterConstraint(options);\n    const resolutionConstraint = resolutionConstraintInfo.constraint;\n    const rotationConstraint = createRotationConstraint(options);\n\n    /**\n     * @private\n     * @type {Constraints}\n     */\n    this.constraints_ = {\n      center: centerConstraint,\n      resolution: resolutionConstraint,\n      rotation: rotationConstraint\n    };\n\n    if (options.resolution !== undefined) {\n      properties[ViewProperty.RESOLUTION] = options.resolution;\n    } else if (options.zoom !== undefined) {\n      properties[ViewProperty.RESOLUTION] = this.constrainResolution(\n        this.maxResolution_, options.zoom - this.minZoom_);\n\n      if (this.resolutions_) { // in case map zoom is out of min/max zoom range\n        properties[ViewProperty.RESOLUTION] = clamp(\n          Number(this.getResolution() || properties[ViewProperty.RESOLUTION]),\n          this.minResolution_, this.maxResolution_);\n      }\n    }\n    properties[ViewProperty.ROTATION] = options.rotation !== undefined ? options.rotation : 0;\n    this.setProperties(properties);\n\n    /**\n     * @private\n     * @type {ViewOptions}\n     */\n    this.options_ = options;\n\n  }\n\n  /**\n   * Get an updated version of the view options used to construct the view.  The\n   * current resolution (or zoom), center, and rotation are applied to any stored\n   * options.  The provided options can be used to apply new min/max zoom or\n   * resolution limits.\n   * @param {ViewOptions} newOptions New options to be applied.\n   * @return {ViewOptions} New options updated with the current view state.\n   */\n  getUpdatedOptions_(newOptions) {\n    const options = assign({}, this.options_);\n\n    // preserve resolution (or zoom)\n    if (options.resolution !== undefined) {\n      options.resolution = this.getResolution();\n    } else {\n      options.zoom = this.getZoom();\n    }\n\n    // preserve center\n    options.center = this.getCenter();\n\n    // preserve rotation\n    options.rotation = this.getRotation();\n\n    return assign({}, options, newOptions);\n  }\n\n  /**\n   * Animate the view.  The view's center, zoom (or resolution), and rotation\n   * can be animated for smooth transitions between view states.  For example,\n   * to animate the view to a new zoom level:\n   *\n   *     view.animate({zoom: view.getZoom() + 1});\n   *\n   * By default, the animation lasts one second and uses in-and-out easing.  You\n   * can customize this behavior by including `duration` (in milliseconds) and\n   * `easing` options (see {@link module:ol/easing}).\n   *\n   * To chain together multiple animations, call the method with multiple\n   * animation objects.  For example, to first zoom and then pan:\n   *\n   *     view.animate({zoom: 10}, {center: [0, 0]});\n   *\n   * If you provide a function as the last argument to the animate method, it\n   * will get called at the end of an animation series.  The callback will be\n   * called with `true` if the animation series completed on its own or `false`\n   * if it was cancelled.\n   *\n   * Animations are cancelled by user interactions (e.g. dragging the map) or by\n   * calling `view.setCenter()`, `view.setResolution()`, or `view.setRotation()`\n   * (or another method that calls one of these).\n   *\n   * @param {...(AnimationOptions|function(boolean))} var_args Animation\n   *     options.  Multiple animations can be run in series by passing multiple\n   *     options objects.  To run multiple animations in parallel, call the method\n   *     multiple times.  An optional callback can be provided as a final\n   *     argument.  The callback will be called with a boolean indicating whether\n   *     the animation completed without being cancelled.\n   * @api\n   */\n  animate(var_args) {\n    let animationCount = arguments.length;\n    let callback;\n    if (animationCount > 1 && typeof arguments[animationCount - 1] === 'function') {\n      callback = arguments[animationCount - 1];\n      --animationCount;\n    }\n    if (!this.isDef()) {\n      // if view properties are not yet set, shortcut to the final state\n      const state = arguments[animationCount - 1];\n      if (state.center) {\n        this.setCenter(state.center);\n      }\n      if (state.zoom !== undefined) {\n        this.setZoom(state.zoom);\n      }\n      if (state.rotation !== undefined) {\n        this.setRotation(state.rotation);\n      }\n      if (callback) {\n        animationCallback(callback, true);\n      }\n      return;\n    }\n    let start = Date.now();\n    let center = this.getCenter().slice();\n    let resolution = this.getResolution();\n    let rotation = this.getRotation();\n    const series = [];\n    for (let i = 0; i < animationCount; ++i) {\n      const options = /** @type {AnimationOptions} */ (arguments[i]);\n\n      const animation = /** @type {Animation} */ ({\n        start: start,\n        complete: false,\n        anchor: options.anchor,\n        duration: options.duration !== undefined ? options.duration : 1000,\n        easing: options.easing || inAndOut\n      });\n\n      if (options.center) {\n        animation.sourceCenter = center;\n        animation.targetCenter = options.center;\n        center = animation.targetCenter;\n      }\n\n      if (options.zoom !== undefined) {\n        animation.sourceResolution = resolution;\n        animation.targetResolution = this.constrainResolution(\n          this.maxResolution_, options.zoom - this.minZoom_, 0);\n        resolution = animation.targetResolution;\n      } else if (options.resolution) {\n        animation.sourceResolution = resolution;\n        animation.targetResolution = options.resolution;\n        resolution = animation.targetResolution;\n      }\n\n      if (options.rotation !== undefined) {\n        animation.sourceRotation = rotation;\n        const delta = modulo(options.rotation - rotation + Math.PI, 2 * Math.PI) - Math.PI;\n        animation.targetRotation = rotation + delta;\n        rotation = animation.targetRotation;\n      }\n\n      animation.callback = callback;\n\n      // check if animation is a no-op\n      if (isNoopAnimation(animation)) {\n        animation.complete = true;\n        // we still push it onto the series for callback handling\n      } else {\n        start += animation.duration;\n      }\n      series.push(animation);\n    }\n    this.animations_.push(series);\n    this.setHint(ViewHint.ANIMATING, 1);\n    this.updateAnimations_();\n  }\n\n  /**\n   * Determine if the view is being animated.\n   * @return {boolean} The view is being animated.\n   * @api\n   */\n  getAnimating() {\n    return this.hints_[ViewHint.ANIMATING] > 0;\n  }\n\n  /**\n   * Determine if the user is interacting with the view, such as panning or zooming.\n   * @return {boolean} The view is being interacted with.\n   * @api\n   */\n  getInteracting() {\n    return this.hints_[ViewHint.INTERACTING] > 0;\n  }\n\n  /**\n   * Cancel any ongoing animations.\n   * @api\n   */\n  cancelAnimations() {\n    this.setHint(ViewHint.ANIMATING, -this.hints_[ViewHint.ANIMATING]);\n    for (let i = 0, ii = this.animations_.length; i < ii; ++i) {\n      const series = this.animations_[i];\n      if (series[0].callback) {\n        animationCallback(series[0].callback, false);\n      }\n    }\n    this.animations_.length = 0;\n  }\n\n  /**\n   * Update all animations.\n   */\n  updateAnimations_() {\n    if (this.updateAnimationKey_ !== undefined) {\n      cancelAnimationFrame(this.updateAnimationKey_);\n      this.updateAnimationKey_ = undefined;\n    }\n    if (!this.getAnimating()) {\n      return;\n    }\n    const now = Date.now();\n    let more = false;\n    for (let i = this.animations_.length - 1; i >= 0; --i) {\n      const series = this.animations_[i];\n      let seriesComplete = true;\n      for (let j = 0, jj = series.length; j < jj; ++j) {\n        const animation = series[j];\n        if (animation.complete) {\n          continue;\n        }\n        const elapsed = now - animation.start;\n        let fraction = animation.duration > 0 ? elapsed / animation.duration : 1;\n        if (fraction >= 1) {\n          animation.complete = true;\n          fraction = 1;\n        } else {\n          seriesComplete = false;\n        }\n        const progress = animation.easing(fraction);\n        if (animation.sourceCenter) {\n          const x0 = animation.sourceCenter[0];\n          const y0 = animation.sourceCenter[1];\n          const x1 = animation.targetCenter[0];\n          const y1 = animation.targetCenter[1];\n          const x = x0 + progress * (x1 - x0);\n          const y = y0 + progress * (y1 - y0);\n          this.set(ViewProperty.CENTER, [x, y]);\n        }\n        if (animation.sourceResolution && animation.targetResolution) {\n          const resolution = progress === 1 ?\n            animation.targetResolution :\n            animation.sourceResolution + progress * (animation.targetResolution - animation.sourceResolution);\n          if (animation.anchor) {\n            this.set(ViewProperty.CENTER,\n              this.calculateCenterZoom(resolution, animation.anchor));\n          }\n          this.set(ViewProperty.RESOLUTION, resolution);\n        }\n        if (animation.sourceRotation !== undefined && animation.targetRotation !== undefined) {\n          const rotation = progress === 1 ?\n            modulo(animation.targetRotation + Math.PI, 2 * Math.PI) - Math.PI :\n            animation.sourceRotation + progress * (animation.targetRotation - animation.sourceRotation);\n          if (animation.anchor) {\n            this.set(ViewProperty.CENTER,\n              this.calculateCenterRotate(rotation, animation.anchor));\n          }\n          this.set(ViewProperty.ROTATION, rotation);\n        }\n        more = true;\n        if (!animation.complete) {\n          break;\n        }\n      }\n      if (seriesComplete) {\n        this.animations_[i] = null;\n        this.setHint(ViewHint.ANIMATING, -1);\n        const callback = series[0].callback;\n        if (callback) {\n          animationCallback(callback, true);\n        }\n      }\n    }\n    // prune completed series\n    this.animations_ = this.animations_.filter(Boolean);\n    if (more && this.updateAnimationKey_ === undefined) {\n      this.updateAnimationKey_ = requestAnimationFrame(this.updateAnimations_);\n    }\n  }\n\n  /**\n   * @param {number} rotation Target rotation.\n   * @param {import(\"./coordinate.js\").Coordinate} anchor Rotation anchor.\n   * @return {import(\"./coordinate.js\").Coordinate|undefined} Center for rotation and anchor.\n   */\n  calculateCenterRotate(rotation, anchor) {\n    let center;\n    const currentCenter = this.getCenter();\n    if (currentCenter !== undefined) {\n      center = [currentCenter[0] - anchor[0], currentCenter[1] - anchor[1]];\n      rotateCoordinate(center, rotation - this.getRotation());\n      addCoordinate(center, anchor);\n    }\n    return center;\n  }\n\n  /**\n   * @param {number} resolution Target resolution.\n   * @param {import(\"./coordinate.js\").Coordinate} anchor Zoom anchor.\n   * @return {import(\"./coordinate.js\").Coordinate|undefined} Center for resolution and anchor.\n   */\n  calculateCenterZoom(resolution, anchor) {\n    let center;\n    const currentCenter = this.getCenter();\n    const currentResolution = this.getResolution();\n    if (currentCenter !== undefined && currentResolution !== undefined) {\n      const x = anchor[0] - resolution * (anchor[0] - currentCenter[0]) / currentResolution;\n      const y = anchor[1] - resolution * (anchor[1] - currentCenter[1]) / currentResolution;\n      center = [x, y];\n    }\n    return center;\n  }\n\n  /**\n   * @private\n   * @return {import(\"./size.js\").Size} Viewport size or `[100, 100]` when no viewport is found.\n   */\n  getSizeFromViewport_() {\n    const size = [100, 100];\n    const selector = '.ol-viewport[data-view=\"' + getUid(this) + '\"]';\n    const element = document.querySelector(selector);\n    if (element) {\n      const metrics = getComputedStyle(element);\n      size[0] = parseInt(metrics.width, 10);\n      size[1] = parseInt(metrics.height, 10);\n    }\n    return size;\n  }\n\n  /**\n   * Get the constrained center of this view.\n   * @param {import(\"./coordinate.js\").Coordinate|undefined} center Center.\n   * @return {import(\"./coordinate.js\").Coordinate|undefined} Constrained center.\n   * @api\n   */\n  constrainCenter(center) {\n    return this.constraints_.center(center);\n  }\n\n  /**\n   * Get the constrained resolution of this view.\n   * @param {number|undefined} resolution Resolution.\n   * @param {number=} opt_delta Delta. Default is `0`.\n   * @param {number=} opt_direction Direction. Default is `0`.\n   * @return {number|undefined} Constrained resolution.\n   * @api\n   */\n  constrainResolution(resolution, opt_delta, opt_direction) {\n    const delta = opt_delta || 0;\n    const direction = opt_direction || 0;\n    return this.constraints_.resolution(resolution, delta, direction);\n  }\n\n  /**\n   * Get the constrained rotation of this view.\n   * @param {number|undefined} rotation Rotation.\n   * @param {number=} opt_delta Delta. Default is `0`.\n   * @return {number|undefined} Constrained rotation.\n   * @api\n   */\n  constrainRotation(rotation, opt_delta) {\n    const delta = opt_delta || 0;\n    return this.constraints_.rotation(rotation, delta);\n  }\n\n  /**\n   * Get the view center.\n   * @return {import(\"./coordinate.js\").Coordinate|undefined} The center of the view.\n   * @observable\n   * @api\n   */\n  getCenter() {\n    return (\n      /** @type {import(\"./coordinate.js\").Coordinate|undefined} */ (this.get(ViewProperty.CENTER))\n    );\n  }\n\n  /**\n   * @return {Constraints} Constraints.\n   */\n  getConstraints() {\n    return this.constraints_;\n  }\n\n  /**\n   * @param {Array<number>=} opt_hints Destination array.\n   * @return {Array<number>} Hint.\n   */\n  getHints(opt_hints) {\n    if (opt_hints !== undefined) {\n      opt_hints[0] = this.hints_[0];\n      opt_hints[1] = this.hints_[1];\n      return opt_hints;\n    } else {\n      return this.hints_.slice();\n    }\n  }\n\n  /**\n   * Calculate the extent for the current view state and the passed size.\n   * The size is the pixel dimensions of the box into which the calculated extent\n   * should fit. In most cases you want to get the extent of the entire map,\n   * that is `map.getSize()`.\n   * @param {import(\"./size.js\").Size=} opt_size Box pixel size. If not provided, the size of the\n   * first map that uses this view will be used.\n   * @return {import(\"./extent.js\").Extent} Extent.\n   * @api\n   */\n  calculateExtent(opt_size) {\n    const size = opt_size || this.getSizeFromViewport_();\n    const center = /** @type {!import(\"./coordinate.js\").Coordinate} */ (this.getCenter());\n    assert(center, 1); // The view center is not defined\n    const resolution = /** @type {!number} */ (this.getResolution());\n    assert(resolution !== undefined, 2); // The view resolution is not defined\n    const rotation = /** @type {!number} */ (this.getRotation());\n    assert(rotation !== undefined, 3); // The view rotation is not defined\n\n    return getForViewAndSize(center, resolution, rotation, size);\n  }\n\n  /**\n   * Get the maximum resolution of the view.\n   * @return {number} The maximum resolution of the view.\n   * @api\n   */\n  getMaxResolution() {\n    return this.maxResolution_;\n  }\n\n  /**\n   * Get the minimum resolution of the view.\n   * @return {number} The minimum resolution of the view.\n   * @api\n   */\n  getMinResolution() {\n    return this.minResolution_;\n  }\n\n  /**\n   * Get the maximum zoom level for the view.\n   * @return {number} The maximum zoom level.\n   * @api\n   */\n  getMaxZoom() {\n    return /** @type {number} */ (this.getZoomForResolution(this.minResolution_));\n  }\n\n  /**\n   * Set a new maximum zoom level for the view.\n   * @param {number} zoom The maximum zoom level.\n   * @api\n   */\n  setMaxZoom(zoom) {\n    this.applyOptions_(this.getUpdatedOptions_({maxZoom: zoom}));\n  }\n\n  /**\n   * Get the minimum zoom level for the view.\n   * @return {number} The minimum zoom level.\n   * @api\n   */\n  getMinZoom() {\n    return /** @type {number} */ (this.getZoomForResolution(this.maxResolution_));\n  }\n\n  /**\n   * Set a new minimum zoom level for the view.\n   * @param {number} zoom The minimum zoom level.\n   * @api\n   */\n  setMinZoom(zoom) {\n    this.applyOptions_(this.getUpdatedOptions_({minZoom: zoom}));\n  }\n\n  /**\n   * Get the view projection.\n   * @return {import(\"./proj/Projection.js\").default} The projection of the view.\n   * @api\n   */\n  getProjection() {\n    return this.projection_;\n  }\n\n  /**\n   * Get the view resolution.\n   * @return {number|undefined} The resolution of the view.\n   * @observable\n   * @api\n   */\n  getResolution() {\n    return /** @type {number|undefined} */ (this.get(ViewProperty.RESOLUTION));\n  }\n\n  /**\n   * Get the resolutions for the view. This returns the array of resolutions\n   * passed to the constructor of the View, or undefined if none were given.\n   * @return {Array<number>|undefined} The resolutions of the view.\n   * @api\n   */\n  getResolutions() {\n    return this.resolutions_;\n  }\n\n  /**\n   * Get the resolution for a provided extent (in map units) and size (in pixels).\n   * @param {import(\"./extent.js\").Extent} extent Extent.\n   * @param {import(\"./size.js\").Size=} opt_size Box pixel size.\n   * @return {number} The resolution at which the provided extent will render at\n   *     the given size.\n   * @api\n   */\n  getResolutionForExtent(extent, opt_size) {\n    const size = opt_size || this.getSizeFromViewport_();\n    const xResolution = getWidth(extent) / size[0];\n    const yResolution = getHeight(extent) / size[1];\n    return Math.max(xResolution, yResolution);\n  }\n\n  /**\n   * Return a function that returns a value between 0 and 1 for a\n   * resolution. Exponential scaling is assumed.\n   * @param {number=} opt_power Power.\n   * @return {function(number): number} Resolution for value function.\n   */\n  getResolutionForValueFunction(opt_power) {\n    const power = opt_power || 2;\n    const maxResolution = this.maxResolution_;\n    const minResolution = this.minResolution_;\n    const max = Math.log(maxResolution / minResolution) / Math.log(power);\n    return (\n      /**\n       * @param {number} value Value.\n       * @return {number} Resolution.\n       */\n      function(value) {\n        const resolution = maxResolution / Math.pow(power, value * max);\n        return resolution;\n      });\n  }\n\n  /**\n   * Get the view rotation.\n   * @return {number} The rotation of the view in radians.\n   * @observable\n   * @api\n   */\n  getRotation() {\n    return /** @type {number} */ (this.get(ViewProperty.ROTATION));\n  }\n\n  /**\n   * Return a function that returns a resolution for a value between\n   * 0 and 1. Exponential scaling is assumed.\n   * @param {number=} opt_power Power.\n   * @return {function(number): number} Value for resolution function.\n   */\n  getValueForResolutionFunction(opt_power) {\n    const power = opt_power || 2;\n    const maxResolution = this.maxResolution_;\n    const minResolution = this.minResolution_;\n    const max = Math.log(maxResolution / minResolution) / Math.log(power);\n    return (\n      /**\n       * @param {number} resolution Resolution.\n       * @return {number} Value.\n       */\n      function(resolution) {\n        const value = (Math.log(maxResolution / resolution) / Math.log(power)) / max;\n        return value;\n      });\n  }\n\n  /**\n   * @param {number} pixelRatio Pixel ratio for center rounding.\n   * @return {State} View state.\n   */\n  getState(pixelRatio) {\n    const center = /** @type {import(\"./coordinate.js\").Coordinate} */ (this.getCenter());\n    const projection = this.getProjection();\n    const resolution = /** @type {number} */ (this.getResolution());\n    const pixelResolution = resolution / pixelRatio;\n    const rotation = this.getRotation();\n    return (\n      /** @type {State} */ ({\n        center: [\n          Math.round(center[0] / pixelResolution) * pixelResolution,\n          Math.round(center[1] / pixelResolution) * pixelResolution\n        ],\n        projection: projection !== undefined ? projection : null,\n        resolution: resolution,\n        rotation: rotation,\n        zoom: this.getZoom()\n      })\n    );\n  }\n\n  /**\n   * Get the current zoom level.  If you configured your view with a resolutions\n   * array (this is rare), this method may return non-integer zoom levels (so\n   * the zoom level is not safe to use as an index into a resolutions array).\n   * @return {number|undefined} Zoom.\n   * @api\n   */\n  getZoom() {\n    let zoom;\n    const resolution = this.getResolution();\n    if (resolution !== undefined) {\n      zoom = this.getZoomForResolution(resolution);\n    }\n    return zoom;\n  }\n\n  /**\n   * Get the zoom level for a resolution.\n   * @param {number} resolution The resolution.\n   * @return {number|undefined} The zoom level for the provided resolution.\n   * @api\n   */\n  getZoomForResolution(resolution) {\n    let offset = this.minZoom_ || 0;\n    let max, zoomFactor;\n    if (this.resolutions_) {\n      const nearest = linearFindNearest(this.resolutions_, resolution, 1);\n      offset = nearest;\n      max = this.resolutions_[nearest];\n      if (nearest == this.resolutions_.length - 1) {\n        zoomFactor = 2;\n      } else {\n        zoomFactor = max / this.resolutions_[nearest + 1];\n      }\n    } else {\n      max = this.maxResolution_;\n      zoomFactor = this.zoomFactor_;\n    }\n    return offset + Math.log(max / resolution) / Math.log(zoomFactor);\n  }\n\n  /**\n   * Get the resolution for a zoom level.\n   * @param {number} zoom Zoom level.\n   * @return {number} The view resolution for the provided zoom level.\n   * @api\n   */\n  getResolutionForZoom(zoom) {\n    return /** @type {number} */ (this.constrainResolution(\n      this.maxResolution_, zoom - this.minZoom_, 0));\n  }\n\n  /**\n   * Fit the given geometry or extent based on the given map size and border.\n   * The size is pixel dimensions of the box to fit the extent into.\n   * In most cases you will want to use the map size, that is `map.getSize()`.\n   * Takes care of the map angle.\n   * @param {import(\"./geom/SimpleGeometry.js\").default|import(\"./extent.js\").Extent} geometryOrExtent The geometry or\n   *     extent to fit the view to.\n   * @param {FitOptions=} opt_options Options.\n   * @api\n   */\n  fit(geometryOrExtent, opt_options) {\n    const options = opt_options || {};\n    let size = options.size;\n    if (!size) {\n      size = this.getSizeFromViewport_();\n    }\n    /** @type {import(\"./geom/SimpleGeometry.js\").default} */\n    let geometry;\n    assert(Array.isArray(geometryOrExtent) || typeof /** @type {?} */ (geometryOrExtent).getSimplifiedGeometry === 'function',\n      24); // Invalid extent or geometry provided as `geometry`\n    if (Array.isArray(geometryOrExtent)) {\n      assert(!isEmpty(geometryOrExtent),\n        25); // Cannot fit empty extent provided as `geometry`\n      geometry = polygonFromExtent(geometryOrExtent);\n    } else if (geometryOrExtent.getType() === GeometryType.CIRCLE) {\n      geometryOrExtent = geometryOrExtent.getExtent();\n      geometry = polygonFromExtent(geometryOrExtent);\n      geometry.rotate(this.getRotation(), getCenter(geometryOrExtent));\n    } else {\n      geometry = geometryOrExtent;\n    }\n\n    const padding = options.padding !== undefined ? options.padding : [0, 0, 0, 0];\n    const constrainResolution = options.constrainResolution !== undefined ?\n      options.constrainResolution : true;\n    const nearest = options.nearest !== undefined ? options.nearest : false;\n    let minResolution;\n    if (options.minResolution !== undefined) {\n      minResolution = options.minResolution;\n    } else if (options.maxZoom !== undefined) {\n      minResolution = this.constrainResolution(\n        this.maxResolution_, options.maxZoom - this.minZoom_, 0);\n    } else {\n      minResolution = 0;\n    }\n    const coords = geometry.getFlatCoordinates();\n\n    // calculate rotated extent\n    const rotation = this.getRotation();\n    const cosAngle = Math.cos(-rotation);\n    let sinAngle = Math.sin(-rotation);\n    let minRotX = +Infinity;\n    let minRotY = +Infinity;\n    let maxRotX = -Infinity;\n    let maxRotY = -Infinity;\n    const stride = geometry.getStride();\n    for (let i = 0, ii = coords.length; i < ii; i += stride) {\n      const rotX = coords[i] * cosAngle - coords[i + 1] * sinAngle;\n      const rotY = coords[i] * sinAngle + coords[i + 1] * cosAngle;\n      minRotX = Math.min(minRotX, rotX);\n      minRotY = Math.min(minRotY, rotY);\n      maxRotX = Math.max(maxRotX, rotX);\n      maxRotY = Math.max(maxRotY, rotY);\n    }\n\n    // calculate resolution\n    let resolution = this.getResolutionForExtent(\n      [minRotX, minRotY, maxRotX, maxRotY],\n      [size[0] - padding[1] - padding[3], size[1] - padding[0] - padding[2]]);\n    resolution = isNaN(resolution) ? minResolution :\n      Math.max(resolution, minResolution);\n    if (constrainResolution) {\n      let constrainedResolution = this.constrainResolution(resolution, 0, 0);\n      if (!nearest && constrainedResolution < resolution) {\n        constrainedResolution = this.constrainResolution(\n          constrainedResolution, -1, 0);\n      }\n      resolution = constrainedResolution;\n    }\n\n    // calculate center\n    sinAngle = -sinAngle; // go back to original rotation\n    let centerRotX = (minRotX + maxRotX) / 2;\n    let centerRotY = (minRotY + maxRotY) / 2;\n    centerRotX += (padding[1] - padding[3]) / 2 * resolution;\n    centerRotY += (padding[0] - padding[2]) / 2 * resolution;\n    const centerX = centerRotX * cosAngle - centerRotY * sinAngle;\n    const centerY = centerRotY * cosAngle + centerRotX * sinAngle;\n    const center = [centerX, centerY];\n    const callback = options.callback ? options.callback : VOID;\n\n    if (options.duration !== undefined) {\n      this.animate({\n        resolution: resolution,\n        center: center,\n        duration: options.duration,\n        easing: options.easing\n      }, callback);\n    } else {\n      this.setResolution(resolution);\n      this.setCenter(center);\n      animationCallback(callback, true);\n    }\n  }\n\n  /**\n   * Center on coordinate and view position.\n   * @param {import(\"./coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {import(\"./size.js\").Size} size Box pixel size.\n   * @param {import(\"./pixel.js\").Pixel} position Position on the view to center on.\n   * @api\n   */\n  centerOn(coordinate, size, position) {\n    // calculate rotated position\n    const rotation = this.getRotation();\n    const cosAngle = Math.cos(-rotation);\n    let sinAngle = Math.sin(-rotation);\n    let rotX = coordinate[0] * cosAngle - coordinate[1] * sinAngle;\n    let rotY = coordinate[1] * cosAngle + coordinate[0] * sinAngle;\n    const resolution = this.getResolution();\n    rotX += (size[0] / 2 - position[0]) * resolution;\n    rotY += (position[1] - size[1] / 2) * resolution;\n\n    // go back to original angle\n    sinAngle = -sinAngle; // go back to original rotation\n    const centerX = rotX * cosAngle - rotY * sinAngle;\n    const centerY = rotY * cosAngle + rotX * sinAngle;\n\n    this.setCenter([centerX, centerY]);\n  }\n\n  /**\n   * @return {boolean} Is defined.\n   */\n  isDef() {\n    return !!this.getCenter() && this.getResolution() !== undefined;\n  }\n\n  /**\n   * Rotate the view around a given coordinate.\n   * @param {number} rotation New rotation value for the view.\n   * @param {import(\"./coordinate.js\").Coordinate=} opt_anchor The rotation center.\n   * @api\n   */\n  rotate(rotation, opt_anchor) {\n    if (opt_anchor !== undefined) {\n      const center = this.calculateCenterRotate(rotation, opt_anchor);\n      this.setCenter(center);\n    }\n    this.setRotation(rotation);\n  }\n\n  /**\n   * Set the center of the current view.\n   * @param {import(\"./coordinate.js\").Coordinate|undefined} center The center of the view.\n   * @observable\n   * @api\n   */\n  setCenter(center) {\n    this.set(ViewProperty.CENTER, center);\n    if (this.getAnimating()) {\n      this.cancelAnimations();\n    }\n  }\n\n  /**\n   * @param {ViewHint} hint Hint.\n   * @param {number} delta Delta.\n   * @return {number} New value.\n   */\n  setHint(hint, delta) {\n    this.hints_[hint] += delta;\n    this.changed();\n    return this.hints_[hint];\n  }\n\n  /**\n   * Set the resolution for this view.\n   * @param {number|undefined} resolution The resolution of the view.\n   * @observable\n   * @api\n   */\n  setResolution(resolution) {\n    this.set(ViewProperty.RESOLUTION, resolution);\n    if (this.getAnimating()) {\n      this.cancelAnimations();\n    }\n  }\n\n  /**\n   * Set the rotation for this view.\n   * @param {number} rotation The rotation of the view in radians.\n   * @observable\n   * @api\n   */\n  setRotation(rotation) {\n    this.set(ViewProperty.ROTATION, rotation);\n    if (this.getAnimating()) {\n      this.cancelAnimations();\n    }\n  }\n\n  /**\n   * Zoom to a specific zoom level.\n   * @param {number} zoom Zoom level.\n   * @api\n   */\n  setZoom(zoom) {\n    this.setResolution(this.getResolutionForZoom(zoom));\n  }\n}\n\n\n/**\n * @param {Function} callback Callback.\n * @param {*} returnValue Return value.\n */\nfunction animationCallback(callback, returnValue) {\n  setTimeout(function() {\n    callback(returnValue);\n  }, 0);\n}\n\n\n/**\n * @param {ViewOptions} options View options.\n * @return {import(\"./centerconstraint.js\").Type} The constraint.\n */\nexport function createCenterConstraint(options) {\n  if (options.extent !== undefined) {\n    return createExtent(options.extent);\n  } else {\n    return centerNone;\n  }\n}\n\n\n/**\n * @param {ViewOptions} options View options.\n * @return {{constraint: import(\"./resolutionconstraint.js\").Type, maxResolution: number,\n *     minResolution: number, minZoom: number, zoomFactor: number}} The constraint.\n */\nexport function createResolutionConstraint(options) {\n  let resolutionConstraint;\n  let maxResolution;\n  let minResolution;\n\n  // TODO: move these to be ol constants\n  // see https://github.com/openlayers/openlayers/issues/2076\n  const defaultMaxZoom = 28;\n  const defaultZoomFactor = 2;\n\n  let minZoom = options.minZoom !== undefined ?\n    options.minZoom : DEFAULT_MIN_ZOOM;\n\n  let maxZoom = options.maxZoom !== undefined ?\n    options.maxZoom : defaultMaxZoom;\n\n  const zoomFactor = options.zoomFactor !== undefined ?\n    options.zoomFactor : defaultZoomFactor;\n\n  if (options.resolutions !== undefined) {\n    const resolutions = options.resolutions;\n    maxResolution = resolutions[minZoom];\n    minResolution = resolutions[maxZoom] !== undefined ?\n      resolutions[maxZoom] : resolutions[resolutions.length - 1];\n    resolutionConstraint = createSnapToResolutions(\n      resolutions);\n  } else {\n    // calculate the default min and max resolution\n    const projection = createProjection(options.projection, 'EPSG:3857');\n    const extent = projection.getExtent();\n    const size = !extent ?\n      // use an extent that can fit the whole world if need be\n      360 * METERS_PER_UNIT[Units.DEGREES] /\n            projection.getMetersPerUnit() :\n      Math.max(getWidth(extent), getHeight(extent));\n\n    const defaultMaxResolution = size / DEFAULT_TILE_SIZE / Math.pow(\n      defaultZoomFactor, DEFAULT_MIN_ZOOM);\n\n    const defaultMinResolution = defaultMaxResolution / Math.pow(\n      defaultZoomFactor, defaultMaxZoom - DEFAULT_MIN_ZOOM);\n\n    // user provided maxResolution takes precedence\n    maxResolution = options.maxResolution;\n    if (maxResolution !== undefined) {\n      minZoom = 0;\n    } else {\n      maxResolution = defaultMaxResolution / Math.pow(zoomFactor, minZoom);\n    }\n\n    // user provided minResolution takes precedence\n    minResolution = options.minResolution;\n    if (minResolution === undefined) {\n      if (options.maxZoom !== undefined) {\n        if (options.maxResolution !== undefined) {\n          minResolution = maxResolution / Math.pow(zoomFactor, maxZoom);\n        } else {\n          minResolution = defaultMaxResolution / Math.pow(zoomFactor, maxZoom);\n        }\n      } else {\n        minResolution = defaultMinResolution;\n      }\n    }\n\n    // given discrete zoom levels, minResolution may be different than provided\n    maxZoom = minZoom + Math.floor(\n      Math.log(maxResolution / minResolution) / Math.log(zoomFactor));\n    minResolution = maxResolution / Math.pow(zoomFactor, maxZoom - minZoom);\n\n    resolutionConstraint = createSnapToPower(\n      zoomFactor, maxResolution, maxZoom - minZoom);\n  }\n  return {constraint: resolutionConstraint, maxResolution: maxResolution,\n    minResolution: minResolution, minZoom: minZoom, zoomFactor: zoomFactor};\n}\n\n\n/**\n * @param {ViewOptions} options View options.\n * @return {import(\"./rotationconstraint.js\").Type} Rotation constraint.\n */\nexport function createRotationConstraint(options) {\n  const enableRotation = options.enableRotation !== undefined ?\n    options.enableRotation : true;\n  if (enableRotation) {\n    const constrainRotation = options.constrainRotation;\n    if (constrainRotation === undefined || constrainRotation === true) {\n      return createSnapToZero();\n    } else if (constrainRotation === false) {\n      return rotationNone;\n    } else if (typeof constrainRotation === 'number') {\n      return createSnapToN(constrainRotation);\n    } else {\n      return rotationNone;\n    }\n  } else {\n    return disable;\n  }\n}\n\n\n/**\n * Determine if an animation involves no view change.\n * @param {Animation} animation The animation.\n * @return {boolean} The animation involves no view change.\n */\nexport function isNoopAnimation(animation) {\n  if (animation.sourceCenter && animation.targetCenter) {\n    if (!coordinatesEqual(animation.sourceCenter, animation.targetCenter)) {\n      return false;\n    }\n  }\n  if (animation.sourceResolution !== animation.targetResolution) {\n    return false;\n  }\n  if (animation.sourceRotation !== animation.targetRotation) {\n    return false;\n  }\n  return true;\n}\n\nexport default View;\n","/**\n * @module ol/dom\n */\n\n\n/**\n * Create an html canvas element and returns its 2d context.\n * @param {number=} opt_width Canvas width.\n * @param {number=} opt_height Canvas height.\n * @return {CanvasRenderingContext2D} The context.\n */\nexport function createCanvasContext2D(opt_width, opt_height) {\n  const canvas = /** @type {HTMLCanvasElement} */ (document.createElement('canvas'));\n  if (opt_width) {\n    canvas.width = opt_width;\n  }\n  if (opt_height) {\n    canvas.height = opt_height;\n  }\n  return /** @type {CanvasRenderingContext2D} */ (canvas.getContext('2d'));\n}\n\n\n/**\n * Get the current computed width for the given element including margin,\n * padding and border.\n * Equivalent to jQuery's `$(el).outerWidth(true)`.\n * @param {!HTMLElement} element Element.\n * @return {number} The width.\n */\nexport function outerWidth(element) {\n  let width = element.offsetWidth;\n  const style = getComputedStyle(element);\n  width += parseInt(style.marginLeft, 10) + parseInt(style.marginRight, 10);\n\n  return width;\n}\n\n\n/**\n * Get the current computed height for the given element including margin,\n * padding and border.\n * Equivalent to jQuery's `$(el).outerHeight(true)`.\n * @param {!HTMLElement} element Element.\n * @return {number} The height.\n */\nexport function outerHeight(element) {\n  let height = element.offsetHeight;\n  const style = getComputedStyle(element);\n  height += parseInt(style.marginTop, 10) + parseInt(style.marginBottom, 10);\n\n  return height;\n}\n\n/**\n * @param {Node} newNode Node to replace old node\n * @param {Node} oldNode The node to be replaced\n */\nexport function replaceNode(newNode, oldNode) {\n  const parent = oldNode.parentNode;\n  if (parent) {\n    parent.replaceChild(newNode, oldNode);\n  }\n}\n\n/**\n * @param {Node} node The node to remove.\n * @returns {Node} The node that was removed or null.\n */\nexport function removeNode(node) {\n  return node && node.parentNode ? node.parentNode.removeChild(node) : null;\n}\n\n/**\n * @param {Node} node The node to remove the children from.\n */\nexport function removeChildren(node) {\n  while (node.lastChild) {\n    node.removeChild(node.lastChild);\n  }\n}\n","/**\n * @module ol/layer/Property\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  OPACITY: 'opacity',\n  VISIBLE: 'visible',\n  EXTENT: 'extent',\n  Z_INDEX: 'zIndex',\n  MAX_RESOLUTION: 'maxResolution',\n  MIN_RESOLUTION: 'minResolution',\n  SOURCE: 'source'\n};\n","/**\n * @module ol/layer/Base\n */\nimport {abstract} from '../util.js';\nimport BaseObject from '../Object.js';\nimport LayerProperty from './Property.js';\nimport {clamp} from '../math.js';\nimport {assign} from '../obj.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {import(\"../extent.js\").Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position. When `undefined`, a `zIndex` of 0 is assumed\n * for layers that are added to the map's `layers` collection, or `Infinity` when the layer's `setMap()`\n * method was used.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n */\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Note that with {@link module:ol/layer/Base} and all its subclasses, any property set in\n * the options is set as a {@link module:ol/Object} property on the layer object, so\n * is observable, and has get/set accessors.\n *\n * @api\n */\nclass BaseLayer extends BaseObject {\n  /**\n   * @param {Options} options Layer options.\n   */\n  constructor(options) {\n\n    super();\n\n    /**\n     * @type {Object<string, *>}\n     */\n    const properties = assign({}, options);\n    properties[LayerProperty.OPACITY] =\n       options.opacity !== undefined ? options.opacity : 1;\n    properties[LayerProperty.VISIBLE] =\n       options.visible !== undefined ? options.visible : true;\n    properties[LayerProperty.Z_INDEX] = options.zIndex;\n    properties[LayerProperty.MAX_RESOLUTION] =\n       options.maxResolution !== undefined ? options.maxResolution : Infinity;\n    properties[LayerProperty.MIN_RESOLUTION] =\n       options.minResolution !== undefined ? options.minResolution : 0;\n\n    this.setProperties(properties);\n\n    /**\n     * @type {import(\"./Layer.js\").State}\n     * @private\n     */\n    this.state_ = null;\n\n    /**\n     * The layer type.\n     * @type {import(\"../LayerType.js\").default}\n     * @protected;\n     */\n    this.type;\n\n  }\n\n  /**\n   * Get the layer type (used when creating a layer renderer).\n   * @return {import(\"../LayerType.js\").default} The layer type.\n   */\n  getType() {\n    return this.type;\n  }\n\n  /**\n   * @return {import(\"./Layer.js\").State} Layer state.\n   */\n  getLayerState() {\n    /** @type {import(\"./Layer.js\").State} */\n    const state = this.state_ || /** @type {?} */ ({\n      layer: this,\n      managed: true\n    });\n    state.opacity = clamp(this.getOpacity(), 0, 1);\n    state.sourceState = this.getSourceState();\n    state.visible = this.getVisible();\n    state.extent = this.getExtent();\n    state.zIndex = this.getZIndex() || 0;\n    state.maxResolution = this.getMaxResolution();\n    state.minResolution = Math.max(this.getMinResolution(), 0);\n    this.state_ = state;\n\n    return state;\n  }\n\n  /**\n   * @abstract\n   * @param {Array<import(\"./Layer.js\").default>=} opt_array Array of layers (to be\n   *     modified in place).\n   * @return {Array<import(\"./Layer.js\").default>} Array of layers.\n   */\n  getLayersArray(opt_array) {\n    return abstract();\n  }\n\n  /**\n   * @abstract\n   * @param {Array<import(\"./Layer.js\").State>=} opt_states Optional list of layer\n   *     states (to be modified in place).\n   * @return {Array<import(\"./Layer.js\").State>} List of layer states.\n   */\n  getLayerStatesArray(opt_states) {\n    return abstract();\n  }\n\n  /**\n   * Return the {@link module:ol/extent~Extent extent} of the layer or `undefined` if it\n   * will be visible regardless of extent.\n   * @return {import(\"../extent.js\").Extent|undefined} The layer extent.\n   * @observable\n   * @api\n   */\n  getExtent() {\n    return (\n      /** @type {import(\"../extent.js\").Extent|undefined} */ (this.get(LayerProperty.EXTENT))\n    );\n  }\n\n  /**\n   * Return the maximum resolution of the layer.\n   * @return {number} The maximum resolution of the layer.\n   * @observable\n   * @api\n   */\n  getMaxResolution() {\n    return /** @type {number} */ (this.get(LayerProperty.MAX_RESOLUTION));\n  }\n\n  /**\n   * Return the minimum resolution of the layer.\n   * @return {number} The minimum resolution of the layer.\n   * @observable\n   * @api\n   */\n  getMinResolution() {\n    return /** @type {number} */ (this.get(LayerProperty.MIN_RESOLUTION));\n  }\n\n  /**\n   * Return the opacity of the layer (between 0 and 1).\n   * @return {number} The opacity of the layer.\n   * @observable\n   * @api\n   */\n  getOpacity() {\n    return /** @type {number} */ (this.get(LayerProperty.OPACITY));\n  }\n\n  /**\n   * @abstract\n   * @return {import(\"../source/State.js\").default} Source state.\n   */\n  getSourceState() {\n    return abstract();\n  }\n\n  /**\n   * Return the visibility of the layer (`true` or `false`).\n   * @return {boolean} The visibility of the layer.\n   * @observable\n   * @api\n   */\n  getVisible() {\n    return /** @type {boolean} */ (this.get(LayerProperty.VISIBLE));\n  }\n\n  /**\n   * Return the Z-index of the layer, which is used to order layers before\n   * rendering. The default Z-index is 0.\n   * @return {number} The Z-index of the layer.\n   * @observable\n   * @api\n   */\n  getZIndex() {\n    return /** @type {number} */ (this.get(LayerProperty.Z_INDEX));\n  }\n\n  /**\n   * Set the extent at which the layer is visible.  If `undefined`, the layer\n   * will be visible at all extents.\n   * @param {import(\"../extent.js\").Extent|undefined} extent The extent of the layer.\n   * @observable\n   * @api\n   */\n  setExtent(extent) {\n    this.set(LayerProperty.EXTENT, extent);\n  }\n\n  /**\n   * Set the maximum resolution at which the layer is visible.\n   * @param {number} maxResolution The maximum resolution of the layer.\n   * @observable\n   * @api\n   */\n  setMaxResolution(maxResolution) {\n    this.set(LayerProperty.MAX_RESOLUTION, maxResolution);\n  }\n\n  /**\n   * Set the minimum resolution at which the layer is visible.\n   * @param {number} minResolution The minimum resolution of the layer.\n   * @observable\n   * @api\n   */\n  setMinResolution(minResolution) {\n    this.set(LayerProperty.MIN_RESOLUTION, minResolution);\n  }\n\n  /**\n   * Set the opacity of the layer, allowed values range from 0 to 1.\n   * @param {number} opacity The opacity of the layer.\n   * @observable\n   * @api\n   */\n  setOpacity(opacity) {\n    this.set(LayerProperty.OPACITY, opacity);\n  }\n\n  /**\n   * Set the visibility of the layer (`true` or `false`).\n   * @param {boolean} visible The visibility of the layer.\n   * @observable\n   * @api\n   */\n  setVisible(visible) {\n    this.set(LayerProperty.VISIBLE, visible);\n  }\n\n  /**\n   * Set Z-index of the layer, which is used to order layers before rendering.\n   * The default Z-index is 0.\n   * @param {number} zindex The z-index of the layer.\n   * @observable\n   * @api\n   */\n  setZIndex(zindex) {\n    this.set(LayerProperty.Z_INDEX, zindex);\n  }\n}\n\n\nexport default BaseLayer;\n","/**\n * @module ol/source/State\n */\n\n/**\n * @enum {string}\n * State of the source, one of 'undefined', 'loading', 'ready' or 'error'.\n */\nexport default {\n  UNDEFINED: 'undefined',\n  LOADING: 'loading',\n  READY: 'ready',\n  ERROR: 'error'\n};\n","/**\n * @module ol/layer/Group\n */\nimport {getUid} from '../util.js';\nimport Collection from '../Collection.js';\nimport CollectionEventType from '../CollectionEventType.js';\nimport {getChangeEventType} from '../Object.js';\nimport ObjectEventType from '../ObjectEventType.js';\nimport {assert} from '../asserts.js';\nimport {listen, unlistenByKey} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {getIntersection} from '../extent.js';\nimport BaseLayer from './Base.js';\nimport {assign, clear} from '../obj.js';\nimport SourceState from '../source/State.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {import(\"../extent.js\").Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position. When `undefined`, a `zIndex` of 0 is assumed\n * for layers that are added to the map's `layers` collection, or `Infinity` when the layer's `setMap()`\n * method was used.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n * @property {Array<import(\"./Base.js\").default>|import(\"../Collection.js\").default<import(\"./Base.js\").default>} [layers] Child layers.\n */\n\n\n/**\n * @enum {string}\n * @private\n */\nconst Property = {\n  LAYERS: 'layers'\n};\n\n\n/**\n * @classdesc\n * A {@link module:ol/Collection~Collection} of layers that are handled together.\n *\n * A generic `change` event is triggered when the group/Collection changes.\n *\n * @api\n */\nclass LayerGroup extends BaseLayer {\n  /**\n   * @param {Options=} opt_options Layer options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n    const baseOptions = /** @type {Options} */ (assign({}, options));\n    delete baseOptions.layers;\n\n    let layers = options.layers;\n\n    super(baseOptions);\n\n    /**\n     * @private\n     * @type {Array<import(\"../events.js\").EventsKey>}\n     */\n    this.layersListenerKeys_ = [];\n\n    /**\n     * @private\n     * @type {Object<string, Array<import(\"../events.js\").EventsKey>>}\n     */\n    this.listenerKeys_ = {};\n\n    listen(this,\n      getChangeEventType(Property.LAYERS),\n      this.handleLayersChanged_, this);\n\n    if (layers) {\n      if (Array.isArray(layers)) {\n        layers = new Collection(layers.slice(), {unique: true});\n      } else {\n        assert(typeof /** @type {?} */ (layers).getArray === 'function',\n          43); // Expected `layers` to be an array or a `Collection`\n      }\n    } else {\n      layers = new Collection(undefined, {unique: true});\n    }\n\n    this.setLayers(layers);\n\n  }\n\n  /**\n   * @private\n   */\n  handleLayerChange_() {\n    this.changed();\n  }\n\n  /**\n   * @private\n   */\n  handleLayersChanged_() {\n    this.layersListenerKeys_.forEach(unlistenByKey);\n    this.layersListenerKeys_.length = 0;\n\n    const layers = this.getLayers();\n    this.layersListenerKeys_.push(\n      listen(layers, CollectionEventType.ADD, this.handleLayersAdd_, this),\n      listen(layers, CollectionEventType.REMOVE, this.handleLayersRemove_, this)\n    );\n\n    for (const id in this.listenerKeys_) {\n      this.listenerKeys_[id].forEach(unlistenByKey);\n    }\n    clear(this.listenerKeys_);\n\n    const layersArray = layers.getArray();\n    for (let i = 0, ii = layersArray.length; i < ii; i++) {\n      const layer = layersArray[i];\n      this.listenerKeys_[getUid(layer)] = [\n        listen(layer, ObjectEventType.PROPERTYCHANGE, this.handleLayerChange_, this),\n        listen(layer, EventType.CHANGE, this.handleLayerChange_, this)\n      ];\n    }\n\n    this.changed();\n  }\n\n  /**\n   * @param {import(\"../Collection.js\").CollectionEvent} collectionEvent CollectionEvent.\n   * @private\n   */\n  handleLayersAdd_(collectionEvent) {\n    const layer = /** @type {import(\"./Base.js\").default} */ (collectionEvent.element);\n    this.listenerKeys_[getUid(layer)] = [\n      listen(layer, ObjectEventType.PROPERTYCHANGE, this.handleLayerChange_, this),\n      listen(layer, EventType.CHANGE, this.handleLayerChange_, this)\n    ];\n    this.changed();\n  }\n\n  /**\n   * @param {import(\"../Collection.js\").CollectionEvent} collectionEvent CollectionEvent.\n   * @private\n   */\n  handleLayersRemove_(collectionEvent) {\n    const layer = /** @type {import(\"./Base.js\").default} */ (collectionEvent.element);\n    const key = getUid(layer);\n    this.listenerKeys_[key].forEach(unlistenByKey);\n    delete this.listenerKeys_[key];\n    this.changed();\n  }\n\n  /**\n   * Returns the {@link module:ol/Collection collection} of {@link module:ol/layer/Layer~Layer layers}\n   * in this group.\n   * @return {!import(\"../Collection.js\").default<import(\"./Base.js\").default>} Collection of\n   *   {@link module:ol/layer/Base layers} that are part of this group.\n   * @observable\n   * @api\n   */\n  getLayers() {\n    return (\n      /** @type {!import(\"../Collection.js\").default<import(\"./Base.js\").default>} */ (this.get(Property.LAYERS))\n    );\n  }\n\n  /**\n   * Set the {@link module:ol/Collection collection} of {@link module:ol/layer/Layer~Layer layers}\n   * in this group.\n   * @param {!import(\"../Collection.js\").default<import(\"./Base.js\").default>} layers Collection of\n   *   {@link module:ol/layer/Base layers} that are part of this group.\n   * @observable\n   * @api\n   */\n  setLayers(layers) {\n    this.set(Property.LAYERS, layers);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getLayersArray(opt_array) {\n    const array = opt_array !== undefined ? opt_array : [];\n    this.getLayers().forEach(function(layer) {\n      layer.getLayersArray(array);\n    });\n    return array;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getLayerStatesArray(opt_states) {\n    const states = opt_states !== undefined ? opt_states : [];\n\n    const pos = states.length;\n\n    this.getLayers().forEach(function(layer) {\n      layer.getLayerStatesArray(states);\n    });\n\n    const ownLayerState = this.getLayerState();\n    for (let i = pos, ii = states.length; i < ii; i++) {\n      const layerState = states[i];\n      layerState.opacity *= ownLayerState.opacity;\n      layerState.visible = layerState.visible && ownLayerState.visible;\n      layerState.maxResolution = Math.min(\n        layerState.maxResolution, ownLayerState.maxResolution);\n      layerState.minResolution = Math.max(\n        layerState.minResolution, ownLayerState.minResolution);\n      if (ownLayerState.extent !== undefined) {\n        if (layerState.extent !== undefined) {\n          layerState.extent = getIntersection(layerState.extent, ownLayerState.extent);\n        } else {\n          layerState.extent = ownLayerState.extent;\n        }\n      }\n    }\n\n    return states;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSourceState() {\n    return SourceState.READY;\n  }\n}\n\n\nexport default LayerGroup;\n","/**\n * @module ol/size\n */\n\n\n/**\n * An array of numbers representing a size: `[width, height]`.\n * @typedef {Array<number>} Size\n * @api\n */\n\n\n/**\n * Returns a buffered size.\n * @param {Size} size Size.\n * @param {number} num The amount by which to buffer.\n * @param {Size=} opt_size Optional reusable size array.\n * @return {Size} The buffered size.\n */\nexport function buffer(size, num, opt_size) {\n  if (opt_size === undefined) {\n    opt_size = [0, 0];\n  }\n  opt_size[0] = size[0] + 2 * num;\n  opt_size[1] = size[1] + 2 * num;\n  return opt_size;\n}\n\n\n/**\n * Determines if a size has a positive area.\n * @param {Size} size The size to test.\n * @return {boolean} The size has a positive area.\n */\nexport function hasArea(size) {\n  return size[0] > 0 && size[1] > 0;\n}\n\n\n/**\n * Returns a size scaled by a ratio. The result will be an array of integers.\n * @param {Size} size Size.\n * @param {number} ratio Ratio.\n * @param {Size=} opt_size Optional reusable size array.\n * @return {Size} The scaled size.\n */\nexport function scale(size, ratio, opt_size) {\n  if (opt_size === undefined) {\n    opt_size = [0, 0];\n  }\n  opt_size[0] = (size[0] * ratio + 0.5) | 0;\n  opt_size[1] = (size[1] * ratio + 0.5) | 0;\n  return opt_size;\n}\n\n\n/**\n * Returns an `Size` array for the passed in number (meaning: square) or\n * `Size` array.\n * (meaning: non-square),\n * @param {number|Size} size Width and height.\n * @param {Size=} opt_size Optional reusable size array.\n * @return {Size} Size.\n * @api\n */\nexport function toSize(size, opt_size) {\n  if (Array.isArray(size)) {\n    return size;\n  } else {\n    if (opt_size === undefined) {\n      opt_size = [size, size];\n    } else {\n      opt_size[0] = opt_size[1] = /** @type {number} */ (size);\n    }\n    return opt_size;\n  }\n}\n","/**\n * @module ol/PluggableMap\n */\nimport {getUid} from './util.js';\nimport Collection from './Collection.js';\nimport CollectionEventType from './CollectionEventType.js';\nimport MapBrowserEvent from './MapBrowserEvent.js';\nimport MapBrowserEventHandler from './MapBrowserEventHandler.js';\nimport MapBrowserEventType from './MapBrowserEventType.js';\nimport MapEvent from './MapEvent.js';\nimport MapEventType from './MapEventType.js';\nimport MapProperty from './MapProperty.js';\nimport RenderEventType from './render/EventType.js';\nimport BaseObject, {getChangeEventType} from './Object.js';\nimport ObjectEventType from './ObjectEventType.js';\nimport TileQueue from './TileQueue.js';\nimport View from './View.js';\nimport ViewHint from './ViewHint.js';\nimport {assert} from './asserts.js';\nimport {removeNode} from './dom.js';\nimport {listen, unlistenByKey, unlisten} from './events.js';\nimport {stopPropagation} from './events/Event.js';\nimport EventType from './events/EventType.js';\nimport {createEmpty, clone, createOrUpdateEmpty, equals, getForViewAndSize, isEmpty} from './extent.js';\nimport {TRUE} from './functions.js';\nimport {DEVICE_PIXEL_RATIO, TOUCH} from './has.js';\nimport LayerGroup from './layer/Group.js';\nimport {hasArea} from './size.js';\nimport {DROP} from './structs/PriorityQueue.js';\nimport {create as createTransform, apply as applyTransform} from './transform.js';\n\n\n/**\n * State of the current frame. Only `pixelRatio`, `time` and `viewState` should\n * be used in applications.\n * @typedef {Object} FrameState\n * @property {number} pixelRatio The pixel ratio of the frame.\n * @property {number} time The time when rendering of the frame was requested.\n * @property {import(\"./View.js\").State} viewState The state of the current view.\n * @property {boolean} animate\n * @property {import(\"./transform.js\").Transform} coordinateToPixelTransform\n * @property {null|import(\"./extent.js\").Extent} extent\n * @property {import(\"./coordinate.js\").Coordinate} focus\n * @property {number} index\n * @property {Object<string, import(\"./layer/Layer.js\").State>} layerStates\n * @property {Array<import(\"./layer/Layer.js\").State>} layerStatesArray\n * @property {import(\"./transform.js\").Transform} pixelToCoordinateTransform\n * @property {Array<PostRenderFunction>} postRenderFunctions\n * @property {import(\"./size.js\").Size} size\n * @property {!Object<string, boolean>} skippedFeatureUids\n * @property {TileQueue} tileQueue\n * @property {Object<string, Object<string, import(\"./TileRange.js\").default>>} usedTiles\n * @property {Array<number>} viewHints\n * @property {!Object<string, Object<string, boolean>>} wantedTiles\n */\n\n\n/**\n * @typedef {function(PluggableMap, ?FrameState): boolean} PostRenderFunction\n */\n\n\n/**\n * @typedef {Object} AtPixelOptions\n * @property {undefined|function(import(\"./layer/Layer.js\").default): boolean} layerFilter Layer filter\n * function. The filter function will receive one argument, the\n * {@link module:ol/layer/Layer layer-candidate} and it should return a boolean value.\n * Only layers which are visible and for which this function returns `true`\n * will be tested for features. By default, all visible layers will be tested.\n * @property {number} [hitTolerance=0] Hit-detection tolerance in pixels. Pixels\n * inside the radius around the given position will be checked for features. This only\n * works for the canvas renderer and not for WebGL.\n */\n\n\n/**\n * @typedef {Object} MapOptionsInternal\n * @property {Collection<import(\"./control/Control.js\").default>} [controls]\n * @property {Collection<import(\"./interaction/Interaction.js\").default>} [interactions]\n * @property {HTMLElement|Document} keyboardEventTarget\n * @property {Collection<import(\"./Overlay.js\").default>} overlays\n * @property {Object<string, *>} values\n */\n\n\n/**\n * Object literal with config options for the map.\n * @typedef {Object} MapOptions\n * @property {Collection<import(\"./control/Control.js\").default>|Array<import(\"./control/Control.js\").default>} [controls]\n * Controls initially added to the map. If not specified,\n * {@link module:ol/control~defaults} is used.\n * @property {number} [pixelRatio=window.devicePixelRatio] The ratio between\n * physical pixels and device-independent pixels (dips) on the device.\n * @property {Collection<import(\"./interaction/Interaction.js\").default>|Array<import(\"./interaction/Interaction.js\").default>} [interactions]\n * Interactions that are initially added to the map. If not specified,\n * {@link module:ol/interaction~defaults} is used.\n * @property {HTMLElement|Document|string} [keyboardEventTarget] The element to\n * listen to keyboard events on. This determines when the `KeyboardPan` and\n * `KeyboardZoom` interactions trigger. For example, if this option is set to\n * `document` the keyboard interactions will always trigger. If this option is\n * not specified, the element the library listens to keyboard events on is the\n * map target (i.e. the user-provided div for the map). If this is not\n * `document`, the target element needs to be focused for key events to be\n * emitted, requiring that the target element has a `tabindex` attribute.\n * @property {Array<import(\"./layer/Base.js\").default>|Collection<import(\"./layer/Base.js\").default>|LayerGroup} [layers]\n * Layers. If this is not defined, a map with no layers will be rendered. Note\n * that layers are rendered in the order supplied, so if you want, for example,\n * a vector layer to appear on top of a tile layer, it must come after the tile\n * layer.\n * @property {number} [maxTilesLoading=16] Maximum number tiles to load\n * simultaneously.\n * @property {boolean} [loadTilesWhileAnimating=false] When set to `true`, tiles\n * will be loaded during animations. This may improve the user experience, but\n * can also make animations stutter on devices with slow memory.\n * @property {boolean} [loadTilesWhileInteracting=false] When set to `true`,\n * tiles will be loaded while interacting with the map. This may improve the\n * user experience, but can also make map panning and zooming choppy on devices\n * with slow memory.\n * @property {number} [moveTolerance=1] The minimum distance in pixels the\n * cursor must move to be detected as a map move event instead of a click.\n * Increasing this value can make it easier to click on the map.\n * @property {Collection<import(\"./Overlay.js\").default>|Array<import(\"./Overlay.js\").default>} [overlays]\n * Overlays initially added to the map. By default, no overlays are added.\n * @property {HTMLElement|string} [target] The container for the map, either the\n * element itself or the `id` of the element. If not specified at construction\n * time, {@link module:ol/Map~Map#setTarget} must be called for the map to be\n * rendered.\n * @property {View} [view] The map's view.  No layer sources will be\n * fetched unless this is specified at construction time or through\n * {@link module:ol/Map~Map#setView}.\n */\n\n\n/**\n * @fires import(\"./MapBrowserEvent.js\").MapBrowserEvent\n * @fires import(\"./MapEvent.js\").MapEvent\n * @fires module:ol/render/Event~RenderEvent#postcompose\n * @fires module:ol/render/Event~RenderEvent#precompose\n * @fires module:ol/render/Event~RenderEvent#rendercomplete\n * @api\n */\nclass PluggableMap extends BaseObject {\n\n  /**\n   * @param {MapOptions} options Map options.\n   */\n  constructor(options) {\n\n    super();\n\n    const optionsInternal = createOptionsInternal(options);\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.maxTilesLoading_ = options.maxTilesLoading !== undefined ? options.maxTilesLoading : 16;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.loadTilesWhileAnimating_ =\n        options.loadTilesWhileAnimating !== undefined ?\n          options.loadTilesWhileAnimating : false;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.loadTilesWhileInteracting_ =\n        options.loadTilesWhileInteracting !== undefined ?\n          options.loadTilesWhileInteracting : false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelRatio_ = options.pixelRatio !== undefined ?\n      options.pixelRatio : DEVICE_PIXEL_RATIO;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.animationDelayKey_;\n\n    /**\n     * @private\n     */\n    this.animationDelay_ = function() {\n      this.animationDelayKey_ = undefined;\n      this.renderFrame_.call(this, Date.now());\n    }.bind(this);\n\n    /**\n     * @private\n     * @type {import(\"./transform.js\").Transform}\n     */\n    this.coordinateToPixelTransform_ = createTransform();\n\n    /**\n     * @private\n     * @type {import(\"./transform.js\").Transform}\n     */\n    this.pixelToCoordinateTransform_ = createTransform();\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.frameIndex_ = 0;\n\n    /**\n     * @private\n     * @type {?FrameState}\n     */\n    this.frameState_ = null;\n\n    /**\n     * The extent at the previous 'moveend' event.\n     * @private\n     * @type {import(\"./extent.js\").Extent}\n     */\n    this.previousExtent_ = null;\n\n    /**\n     * @private\n     * @type {?import(\"./events.js\").EventsKey}\n     */\n    this.viewPropertyListenerKey_ = null;\n\n    /**\n     * @private\n     * @type {?import(\"./events.js\").EventsKey}\n     */\n    this.viewChangeListenerKey_ = null;\n\n    /**\n     * @private\n     * @type {Array<import(\"./events.js\").EventsKey>}\n     */\n    this.layerGroupPropertyListenerKeys_ = null;\n\n    /**\n     * @private\n     * @type {!HTMLElement}\n     */\n    this.viewport_ = document.createElement('div');\n    this.viewport_.className = 'ol-viewport' + (TOUCH ? ' ol-touch' : '');\n    this.viewport_.style.position = 'relative';\n    this.viewport_.style.overflow = 'hidden';\n    this.viewport_.style.width = '100%';\n    this.viewport_.style.height = '100%';\n    // prevent page zoom on IE >= 10 browsers\n    this.viewport_.style.msTouchAction = 'none';\n    this.viewport_.style.touchAction = 'none';\n\n    /**\n     * @private\n     * @type {!HTMLElement}\n     */\n    this.overlayContainer_ = document.createElement('div');\n    this.overlayContainer_.className = 'ol-overlaycontainer';\n    this.viewport_.appendChild(this.overlayContainer_);\n\n    /**\n     * @private\n     * @type {!HTMLElement}\n     */\n    this.overlayContainerStopEvent_ = document.createElement('div');\n    this.overlayContainerStopEvent_.className = 'ol-overlaycontainer-stopevent';\n    const overlayEvents = [\n      EventType.CLICK,\n      EventType.DBLCLICK,\n      EventType.MOUSEDOWN,\n      EventType.TOUCHSTART,\n      EventType.MSPOINTERDOWN,\n      MapBrowserEventType.POINTERDOWN,\n      EventType.MOUSEWHEEL,\n      EventType.WHEEL\n    ];\n    for (let i = 0, ii = overlayEvents.length; i < ii; ++i) {\n      listen(this.overlayContainerStopEvent_, overlayEvents[i], stopPropagation);\n    }\n    this.viewport_.appendChild(this.overlayContainerStopEvent_);\n\n    /**\n     * @private\n     * @type {MapBrowserEventHandler}\n     */\n    this.mapBrowserEventHandler_ = new MapBrowserEventHandler(this, options.moveTolerance);\n    for (const key in MapBrowserEventType) {\n      listen(this.mapBrowserEventHandler_, MapBrowserEventType[key],\n        this.handleMapBrowserEvent, this);\n    }\n\n    /**\n     * @private\n     * @type {HTMLElement|Document}\n     */\n    this.keyboardEventTarget_ = optionsInternal.keyboardEventTarget;\n\n    /**\n     * @private\n     * @type {Array<import(\"./events.js\").EventsKey>}\n     */\n    this.keyHandlerKeys_ = null;\n\n    listen(this.viewport_, EventType.CONTEXTMENU, this.handleBrowserEvent, this);\n    listen(this.viewport_, EventType.WHEEL, this.handleBrowserEvent, this);\n    listen(this.viewport_, EventType.MOUSEWHEEL, this.handleBrowserEvent, this);\n\n    /**\n     * @type {Collection<import(\"./control/Control.js\").default>}\n     * @protected\n     */\n    this.controls = optionsInternal.controls || new Collection();\n\n    /**\n     * @type {Collection<import(\"./interaction/Interaction.js\").default>}\n     * @protected\n     */\n    this.interactions = optionsInternal.interactions || new Collection();\n\n    /**\n     * @type {Collection<import(\"./Overlay.js\").default>}\n     * @private\n     */\n    this.overlays_ = optionsInternal.overlays;\n\n    /**\n     * A lookup of overlays by id.\n     * @private\n     * @type {Object<string, import(\"./Overlay.js\").default>}\n     */\n    this.overlayIdIndex_ = {};\n\n    /**\n     * @type {import(\"./renderer/Map.js\").default}\n     * @private\n     */\n    this.renderer_ = this.createRenderer();\n\n    /**\n     * @type {function(Event)|undefined}\n     * @private\n     */\n    this.handleResize_;\n\n    /**\n     * @private\n     * @type {import(\"./coordinate.js\").Coordinate}\n     */\n    this.focus_ = null;\n\n    /**\n     * @private\n     * @type {!Array<PostRenderFunction>}\n     */\n    this.postRenderFunctions_ = [];\n\n    /**\n     * @private\n     * @type {TileQueue}\n     */\n    this.tileQueue_ = new TileQueue(\n      this.getTilePriority.bind(this),\n      this.handleTileChange_.bind(this));\n\n    /**\n     * Uids of features to skip at rendering time.\n     * @type {Object<string, boolean>}\n     * @private\n     */\n    this.skippedFeatureUids_ = {};\n\n    listen(\n      this, getChangeEventType(MapProperty.LAYERGROUP),\n      this.handleLayerGroupChanged_, this);\n    listen(this, getChangeEventType(MapProperty.VIEW),\n      this.handleViewChanged_, this);\n    listen(this, getChangeEventType(MapProperty.SIZE),\n      this.handleSizeChanged_, this);\n    listen(this, getChangeEventType(MapProperty.TARGET),\n      this.handleTargetChanged_, this);\n\n    // setProperties will trigger the rendering of the map if the map\n    // is \"defined\" already.\n    this.setProperties(optionsInternal.values);\n\n    this.controls.forEach(\n      /**\n       * @param {import(\"./control/Control.js\").default} control Control.\n       * @this {PluggableMap}\n       */\n      (function(control) {\n        control.setMap(this);\n      }).bind(this));\n\n    listen(this.controls, CollectionEventType.ADD,\n      /**\n       * @param {import(\"./Collection.js\").CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        event.element.setMap(this);\n      }, this);\n\n    listen(this.controls, CollectionEventType.REMOVE,\n      /**\n       * @param {import(\"./Collection.js\").CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        event.element.setMap(null);\n      }, this);\n\n    this.interactions.forEach(\n      /**\n       * @param {import(\"./interaction/Interaction.js\").default} interaction Interaction.\n       * @this {PluggableMap}\n       */\n      (function(interaction) {\n        interaction.setMap(this);\n      }).bind(this));\n\n    listen(this.interactions, CollectionEventType.ADD,\n      /**\n       * @param {import(\"./Collection.js\").CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        event.element.setMap(this);\n      }, this);\n\n    listen(this.interactions, CollectionEventType.REMOVE,\n      /**\n       * @param {import(\"./Collection.js\").CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        event.element.setMap(null);\n      }, this);\n\n    this.overlays_.forEach(this.addOverlayInternal_.bind(this));\n\n    listen(this.overlays_, CollectionEventType.ADD,\n      /**\n       * @param {import(\"./Collection.js\").CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        this.addOverlayInternal_(/** @type {import(\"./Overlay.js\").default} */ (event.element));\n      }, this);\n\n    listen(this.overlays_, CollectionEventType.REMOVE,\n      /**\n       * @param {import(\"./Collection.js\").CollectionEvent} event CollectionEvent.\n       */\n      function(event) {\n        const overlay = /** @type {import(\"./Overlay.js\").default} */ (event.element);\n        const id = overlay.getId();\n        if (id !== undefined) {\n          delete this.overlayIdIndex_[id.toString()];\n        }\n        event.element.setMap(null);\n      }, this);\n\n  }\n\n  /**\n   * @abstract\n   * @return {import(\"./renderer/Map.js\").default} The map renderer\n   */\n  createRenderer() {\n    throw new Error('Use a map type that has a createRenderer method');\n  }\n\n  /**\n   * Add the given control to the map.\n   * @param {import(\"./control/Control.js\").default} control Control.\n   * @api\n   */\n  addControl(control) {\n    this.getControls().push(control);\n  }\n\n  /**\n   * Add the given interaction to the map.\n   * @param {import(\"./interaction/Interaction.js\").default} interaction Interaction to add.\n   * @api\n   */\n  addInteraction(interaction) {\n    this.getInteractions().push(interaction);\n  }\n\n  /**\n   * Adds the given layer to the top of this map. If you want to add a layer\n   * elsewhere in the stack, use `getLayers()` and the methods available on\n   * {@link module:ol/Collection~Collection}.\n   * @param {import(\"./layer/Base.js\").default} layer Layer.\n   * @api\n   */\n  addLayer(layer) {\n    const layers = this.getLayerGroup().getLayers();\n    layers.push(layer);\n  }\n\n  /**\n   * Add the given overlay to the map.\n   * @param {import(\"./Overlay.js\").default} overlay Overlay.\n   * @api\n   */\n  addOverlay(overlay) {\n    this.getOverlays().push(overlay);\n  }\n\n  /**\n   * This deals with map's overlay collection changes.\n   * @param {import(\"./Overlay.js\").default} overlay Overlay.\n   * @private\n   */\n  addOverlayInternal_(overlay) {\n    const id = overlay.getId();\n    if (id !== undefined) {\n      this.overlayIdIndex_[id.toString()] = overlay;\n    }\n    overlay.setMap(this);\n  }\n\n  /**\n   *\n   * @inheritDoc\n   */\n  disposeInternal() {\n    this.mapBrowserEventHandler_.dispose();\n    unlisten(this.viewport_, EventType.CONTEXTMENU, this.handleBrowserEvent, this);\n    unlisten(this.viewport_, EventType.WHEEL, this.handleBrowserEvent, this);\n    unlisten(this.viewport_, EventType.MOUSEWHEEL, this.handleBrowserEvent, this);\n    if (this.handleResize_ !== undefined) {\n      removeEventListener(EventType.RESIZE, this.handleResize_, false);\n      this.handleResize_ = undefined;\n    }\n    if (this.animationDelayKey_) {\n      cancelAnimationFrame(this.animationDelayKey_);\n      this.animationDelayKey_ = undefined;\n    }\n    this.setTarget(null);\n    super.disposeInternal();\n  }\n\n  /**\n   * Detect features that intersect a pixel on the viewport, and execute a\n   * callback with each intersecting feature. Layers included in the detection can\n   * be configured through the `layerFilter` option in `opt_options`.\n   * @param {import(\"./pixel.js\").Pixel} pixel Pixel.\n   * @param {function(this: S, import(\"./Feature.js\").FeatureLike,\n   *     import(\"./layer/Layer.js\").default): T} callback Feature callback. The callback will be\n   *     called with two arguments. The first argument is one\n   *     {@link module:ol/Feature feature} or\n   *     {@link module:ol/render/Feature render feature} at the pixel, the second is\n   *     the {@link module:ol/layer/Layer layer} of the feature and will be null for\n   *     unmanaged layers. To stop detection, callback functions can return a\n   *     truthy value.\n   * @param {AtPixelOptions=} opt_options Optional options.\n   * @return {T|undefined} Callback result, i.e. the return value of last\n   * callback execution, or the first truthy callback return value.\n   * @template S,T\n   * @api\n   */\n  forEachFeatureAtPixel(pixel, callback, opt_options) {\n    if (!this.frameState_) {\n      return;\n    }\n    const coordinate = this.getCoordinateFromPixel(pixel);\n    opt_options = opt_options !== undefined ? opt_options :\n      /** @type {AtPixelOptions} */ ({});\n    const hitTolerance = opt_options.hitTolerance !== undefined ?\n      opt_options.hitTolerance * this.frameState_.pixelRatio : 0;\n    const layerFilter = opt_options.layerFilter !== undefined ?\n      opt_options.layerFilter : TRUE;\n    return this.renderer_.forEachFeatureAtCoordinate(\n      coordinate, this.frameState_, hitTolerance, callback, null,\n      layerFilter, null);\n  }\n\n  /**\n   * Get all features that intersect a pixel on the viewport.\n   * @param {import(\"./pixel.js\").Pixel} pixel Pixel.\n   * @param {AtPixelOptions=} opt_options Optional options.\n   * @return {Array<import(\"./Feature.js\").FeatureLike>} The detected features or\n   * `null` if none were found.\n   * @api\n   */\n  getFeaturesAtPixel(pixel, opt_options) {\n    let features = null;\n    this.forEachFeatureAtPixel(pixel, function(feature) {\n      if (!features) {\n        features = [];\n      }\n      features.push(feature);\n    }, opt_options);\n    return features;\n  }\n\n  /**\n   * Detect layers that have a color value at a pixel on the viewport, and\n   * execute a callback with each matching layer. Layers included in the\n   * detection can be configured through `opt_layerFilter`.\n   * @param {import(\"./pixel.js\").Pixel} pixel Pixel.\n   * @param {function(this: S, import(\"./layer/Layer.js\").default, (Uint8ClampedArray|Uint8Array)): T} callback\n   *     Layer callback. This callback will receive two arguments: first is the\n   *     {@link module:ol/layer/Layer layer}, second argument is an array representing\n   *     [R, G, B, A] pixel values (0 - 255) and will be `null` for layer types\n   *     that do not currently support this argument. To stop detection, callback\n   *     functions can return a truthy value.\n   * @param {AtPixelOptions=} opt_options Configuration options.\n   * @return {T|undefined} Callback result, i.e. the return value of last\n   * callback execution, or the first truthy callback return value.\n   * @template S,T\n   * @api\n   */\n  forEachLayerAtPixel(pixel, callback, opt_options) {\n    if (!this.frameState_) {\n      return;\n    }\n    const options = opt_options || /** @type {AtPixelOptions} */ ({});\n    const hitTolerance = options.hitTolerance !== undefined ?\n      opt_options.hitTolerance * this.frameState_.pixelRatio : 0;\n    const layerFilter = options.layerFilter || TRUE;\n    return this.renderer_.forEachLayerAtPixel(\n      pixel, this.frameState_, hitTolerance, callback, null, layerFilter, null);\n  }\n\n  /**\n   * Detect if features intersect a pixel on the viewport. Layers included in the\n   * detection can be configured through `opt_layerFilter`.\n   * @param {import(\"./pixel.js\").Pixel} pixel Pixel.\n   * @param {AtPixelOptions=} opt_options Optional options.\n   * @return {boolean} Is there a feature at the given pixel?\n   * @template U\n   * @api\n   */\n  hasFeatureAtPixel(pixel, opt_options) {\n    if (!this.frameState_) {\n      return false;\n    }\n    const coordinate = this.getCoordinateFromPixel(pixel);\n    opt_options = opt_options !== undefined ? opt_options :\n      /** @type {AtPixelOptions} */ ({});\n    const layerFilter = opt_options.layerFilter !== undefined ? opt_options.layerFilter : TRUE;\n    const hitTolerance = opt_options.hitTolerance !== undefined ?\n      opt_options.hitTolerance * this.frameState_.pixelRatio : 0;\n    return this.renderer_.hasFeatureAtCoordinate(\n      coordinate, this.frameState_, hitTolerance, layerFilter, null);\n  }\n\n  /**\n   * Returns the coordinate in view projection for a browser event.\n   * @param {Event} event Event.\n   * @return {import(\"./coordinate.js\").Coordinate} Coordinate.\n   * @api\n   */\n  getEventCoordinate(event) {\n    return this.getCoordinateFromPixel(this.getEventPixel(event));\n  }\n\n  /**\n   * Returns the map pixel position for a browser event relative to the viewport.\n   * @param {Event|TouchEvent} event Event.\n   * @return {import(\"./pixel.js\").Pixel} Pixel.\n   * @api\n   */\n  getEventPixel(event) {\n    const viewportPosition = this.viewport_.getBoundingClientRect();\n    const eventPosition = 'changedTouches' in event ?\n      /** @type {TouchEvent} */ (event).changedTouches[0] :\n      /** @type {MouseEvent} */ (event);\n\n    return [\n      eventPosition.clientX - viewportPosition.left,\n      eventPosition.clientY - viewportPosition.top\n    ];\n  }\n\n  /**\n   * Get the target in which this map is rendered.\n   * Note that this returns what is entered as an option or in setTarget:\n   * if that was an element, it returns an element; if a string, it returns that.\n   * @return {HTMLElement|string|undefined} The Element or id of the Element that the\n   *     map is rendered in.\n   * @observable\n   * @api\n   */\n  getTarget() {\n    return /** @type {HTMLElement|string|undefined} */ (this.get(MapProperty.TARGET));\n  }\n\n  /**\n   * Get the DOM element into which this map is rendered. In contrast to\n   * `getTarget` this method always return an `Element`, or `null` if the\n   * map has no target.\n   * @return {HTMLElement} The element that the map is rendered in.\n   * @api\n   */\n  getTargetElement() {\n    const target = this.getTarget();\n    if (target !== undefined) {\n      return typeof target === 'string' ? document.getElementById(target) : target;\n    } else {\n      return null;\n    }\n  }\n\n  /**\n   * Get the coordinate for a given pixel.  This returns a coordinate in the\n   * map view projection.\n   * @param {import(\"./pixel.js\").Pixel} pixel Pixel position in the map viewport.\n   * @return {import(\"./coordinate.js\").Coordinate} The coordinate for the pixel position.\n   * @api\n   */\n  getCoordinateFromPixel(pixel) {\n    const frameState = this.frameState_;\n    if (!frameState) {\n      return null;\n    } else {\n      return applyTransform(frameState.pixelToCoordinateTransform, pixel.slice());\n    }\n  }\n\n  /**\n   * Get the map controls. Modifying this collection changes the controls\n   * associated with the map.\n   * @return {Collection<import(\"./control/Control.js\").default>} Controls.\n   * @api\n   */\n  getControls() {\n    return this.controls;\n  }\n\n  /**\n   * Get the map overlays. Modifying this collection changes the overlays\n   * associated with the map.\n   * @return {Collection<import(\"./Overlay.js\").default>} Overlays.\n   * @api\n   */\n  getOverlays() {\n    return this.overlays_;\n  }\n\n  /**\n   * Get an overlay by its identifier (the value returned by overlay.getId()).\n   * Note that the index treats string and numeric identifiers as the same. So\n   * `map.getOverlayById(2)` will return an overlay with id `'2'` or `2`.\n   * @param {string|number} id Overlay identifier.\n   * @return {import(\"./Overlay.js\").default} Overlay.\n   * @api\n   */\n  getOverlayById(id) {\n    const overlay = this.overlayIdIndex_[id.toString()];\n    return overlay !== undefined ? overlay : null;\n  }\n\n  /**\n   * Get the map interactions. Modifying this collection changes the interactions\n   * associated with the map.\n   *\n   * Interactions are used for e.g. pan, zoom and rotate.\n   * @return {Collection<import(\"./interaction/Interaction.js\").default>} Interactions.\n   * @api\n   */\n  getInteractions() {\n    return this.interactions;\n  }\n\n  /**\n   * Get the layergroup associated with this map.\n   * @return {LayerGroup} A layer group containing the layers in this map.\n   * @observable\n   * @api\n   */\n  getLayerGroup() {\n    return (\n      /** @type {LayerGroup} */ (this.get(MapProperty.LAYERGROUP))\n    );\n  }\n\n  /**\n   * Get the collection of layers associated with this map.\n   * @return {!Collection<import(\"./layer/Base.js\").default>} Layers.\n   * @api\n   */\n  getLayers() {\n    const layers = this.getLayerGroup().getLayers();\n    return layers;\n  }\n\n  /**\n   * Get the pixel for a coordinate.  This takes a coordinate in the map view\n   * projection and returns the corresponding pixel.\n   * @param {import(\"./coordinate.js\").Coordinate} coordinate A map coordinate.\n   * @return {import(\"./pixel.js\").Pixel} A pixel position in the map viewport.\n   * @api\n   */\n  getPixelFromCoordinate(coordinate) {\n    const frameState = this.frameState_;\n    if (!frameState) {\n      return null;\n    } else {\n      return applyTransform(frameState.coordinateToPixelTransform, coordinate.slice(0, 2));\n    }\n  }\n\n  /**\n   * Get the map renderer.\n   * @return {import(\"./renderer/Map.js\").default} Renderer\n   */\n  getRenderer() {\n    return this.renderer_;\n  }\n\n  /**\n   * Get the size of this map.\n   * @return {import(\"./size.js\").Size|undefined} The size in pixels of the map in the DOM.\n   * @observable\n   * @api\n   */\n  getSize() {\n    return (\n      /** @type {import(\"./size.js\").Size|undefined} */ (this.get(MapProperty.SIZE))\n    );\n  }\n\n  /**\n   * Get the view associated with this map. A view manages properties such as\n   * center and resolution.\n   * @return {View} The view that controls this map.\n   * @observable\n   * @api\n   */\n  getView() {\n    return (\n      /** @type {View} */ (this.get(MapProperty.VIEW))\n    );\n  }\n\n  /**\n   * Get the element that serves as the map viewport.\n   * @return {HTMLElement} Viewport.\n   * @api\n   */\n  getViewport() {\n    return this.viewport_;\n  }\n\n  /**\n   * Get the element that serves as the container for overlays.  Elements added to\n   * this container will let mousedown and touchstart events through to the map,\n   * so clicks and gestures on an overlay will trigger {@link module:ol/MapBrowserEvent~MapBrowserEvent}\n   * events.\n   * @return {!HTMLElement} The map's overlay container.\n   */\n  getOverlayContainer() {\n    return this.overlayContainer_;\n  }\n\n  /**\n   * Get the element that serves as a container for overlays that don't allow\n   * event propagation. Elements added to this container won't let mousedown and\n   * touchstart events through to the map, so clicks and gestures on an overlay\n   * don't trigger any {@link module:ol/MapBrowserEvent~MapBrowserEvent}.\n   * @return {!HTMLElement} The map's overlay container that stops events.\n   */\n  getOverlayContainerStopEvent() {\n    return this.overlayContainerStopEvent_;\n  }\n\n  /**\n   * @param {import(\"./Tile.js\").default} tile Tile.\n   * @param {string} tileSourceKey Tile source key.\n   * @param {import(\"./coordinate.js\").Coordinate} tileCenter Tile center.\n   * @param {number} tileResolution Tile resolution.\n   * @return {number} Tile priority.\n   */\n  getTilePriority(tile, tileSourceKey, tileCenter, tileResolution) {\n    // Filter out tiles at higher zoom levels than the current zoom level, or that\n    // are outside the visible extent.\n    const frameState = this.frameState_;\n    if (!frameState || !(tileSourceKey in frameState.wantedTiles)) {\n      return DROP;\n    }\n    if (!frameState.wantedTiles[tileSourceKey][tile.getKey()]) {\n      return DROP;\n    }\n    // Prioritize the highest zoom level tiles closest to the focus.\n    // Tiles at higher zoom levels are prioritized using Math.log(tileResolution).\n    // Within a zoom level, tiles are prioritized by the distance in pixels\n    // between the center of the tile and the focus.  The factor of 65536 means\n    // that the prioritization should behave as desired for tiles up to\n    // 65536 * Math.log(2) = 45426 pixels from the focus.\n    const deltaX = tileCenter[0] - frameState.focus[0];\n    const deltaY = tileCenter[1] - frameState.focus[1];\n    return 65536 * Math.log(tileResolution) +\n        Math.sqrt(deltaX * deltaX + deltaY * deltaY) / tileResolution;\n  }\n\n  /**\n   * @param {Event} browserEvent Browser event.\n   * @param {string=} opt_type Type.\n   */\n  handleBrowserEvent(browserEvent, opt_type) {\n    const type = opt_type || browserEvent.type;\n    const mapBrowserEvent = new MapBrowserEvent(type, this, browserEvent);\n    this.handleMapBrowserEvent(mapBrowserEvent);\n  }\n\n  /**\n   * @param {MapBrowserEvent} mapBrowserEvent The event to handle.\n   */\n  handleMapBrowserEvent(mapBrowserEvent) {\n    if (!this.frameState_) {\n      // With no view defined, we cannot translate pixels into geographical\n      // coordinates so interactions cannot be used.\n      return;\n    }\n    this.focus_ = mapBrowserEvent.coordinate;\n    mapBrowserEvent.frameState = this.frameState_;\n    const interactionsArray = this.getInteractions().getArray();\n    if (this.dispatchEvent(mapBrowserEvent) !== false) {\n      for (let i = interactionsArray.length - 1; i >= 0; i--) {\n        const interaction = interactionsArray[i];\n        if (!interaction.getActive()) {\n          continue;\n        }\n        const cont = interaction.handleEvent(mapBrowserEvent);\n        if (!cont) {\n          break;\n        }\n      }\n    }\n  }\n\n  /**\n   * @protected\n   */\n  handlePostRender() {\n\n    const frameState = this.frameState_;\n\n    // Manage the tile queue\n    // Image loads are expensive and a limited resource, so try to use them\n    // efficiently:\n    // * When the view is static we allow a large number of parallel tile loads\n    //   to complete the frame as quickly as possible.\n    // * When animating or interacting, image loads can cause janks, so we reduce\n    //   the maximum number of loads per frame and limit the number of parallel\n    //   tile loads to remain reactive to view changes and to reduce the chance of\n    //   loading tiles that will quickly disappear from view.\n    const tileQueue = this.tileQueue_;\n    if (!tileQueue.isEmpty()) {\n      let maxTotalLoading = this.maxTilesLoading_;\n      let maxNewLoads = maxTotalLoading;\n      if (frameState) {\n        const hints = frameState.viewHints;\n        if (hints[ViewHint.ANIMATING]) {\n          maxTotalLoading = this.loadTilesWhileAnimating_ ? 8 : 0;\n          maxNewLoads = 2;\n        }\n        if (hints[ViewHint.INTERACTING]) {\n          maxTotalLoading = this.loadTilesWhileInteracting_ ? 8 : 0;\n          maxNewLoads = 2;\n        }\n      }\n      if (tileQueue.getTilesLoading() < maxTotalLoading) {\n        tileQueue.reprioritize(); // FIXME only call if view has changed\n        tileQueue.loadMoreTiles(maxTotalLoading, maxNewLoads);\n      }\n    }\n    if (frameState && this.hasListener(RenderEventType.RENDERCOMPLETE) && !frameState.animate &&\n        !this.tileQueue_.getTilesLoading() && !getLoading(this.getLayers().getArray())) {\n      this.renderer_.dispatchRenderEvent(RenderEventType.RENDERCOMPLETE, frameState);\n    }\n\n    const postRenderFunctions = this.postRenderFunctions_;\n    for (let i = 0, ii = postRenderFunctions.length; i < ii; ++i) {\n      postRenderFunctions[i](this, frameState);\n    }\n    postRenderFunctions.length = 0;\n  }\n\n  /**\n   * @private\n   */\n  handleSizeChanged_() {\n    this.render();\n  }\n\n  /**\n   * @private\n   */\n  handleTargetChanged_() {\n    // target may be undefined, null, a string or an Element.\n    // If it's a string we convert it to an Element before proceeding.\n    // If it's not now an Element we remove the viewport from the DOM.\n    // If it's an Element we append the viewport element to it.\n\n    let targetElement;\n    if (this.getTarget()) {\n      targetElement = this.getTargetElement();\n    }\n\n    if (this.keyHandlerKeys_) {\n      for (let i = 0, ii = this.keyHandlerKeys_.length; i < ii; ++i) {\n        unlistenByKey(this.keyHandlerKeys_[i]);\n      }\n      this.keyHandlerKeys_ = null;\n    }\n\n    if (!targetElement) {\n      this.renderer_.removeLayerRenderers();\n      removeNode(this.viewport_);\n      if (this.handleResize_ !== undefined) {\n        removeEventListener(EventType.RESIZE, this.handleResize_, false);\n        this.handleResize_ = undefined;\n      }\n    } else {\n      targetElement.appendChild(this.viewport_);\n\n      const keyboardEventTarget = !this.keyboardEventTarget_ ?\n        targetElement : this.keyboardEventTarget_;\n      this.keyHandlerKeys_ = [\n        listen(keyboardEventTarget, EventType.KEYDOWN, this.handleBrowserEvent, this),\n        listen(keyboardEventTarget, EventType.KEYPRESS, this.handleBrowserEvent, this)\n      ];\n\n      if (!this.handleResize_) {\n        this.handleResize_ = this.updateSize.bind(this);\n        window.addEventListener(EventType.RESIZE, this.handleResize_, false);\n      }\n    }\n\n    this.updateSize();\n    // updateSize calls setSize, so no need to call this.render\n    // ourselves here.\n  }\n\n  /**\n   * @private\n   */\n  handleTileChange_() {\n    this.render();\n  }\n\n  /**\n   * @private\n   */\n  handleViewPropertyChanged_() {\n    this.render();\n  }\n\n  /**\n   * @private\n   */\n  handleViewChanged_() {\n    if (this.viewPropertyListenerKey_) {\n      unlistenByKey(this.viewPropertyListenerKey_);\n      this.viewPropertyListenerKey_ = null;\n    }\n    if (this.viewChangeListenerKey_) {\n      unlistenByKey(this.viewChangeListenerKey_);\n      this.viewChangeListenerKey_ = null;\n    }\n    const view = this.getView();\n    if (view) {\n      this.viewport_.setAttribute('data-view', getUid(view));\n      this.viewPropertyListenerKey_ = listen(\n        view, ObjectEventType.PROPERTYCHANGE,\n        this.handleViewPropertyChanged_, this);\n      this.viewChangeListenerKey_ = listen(\n        view, EventType.CHANGE,\n        this.handleViewPropertyChanged_, this);\n    }\n    this.render();\n  }\n\n  /**\n   * @private\n   */\n  handleLayerGroupChanged_() {\n    if (this.layerGroupPropertyListenerKeys_) {\n      this.layerGroupPropertyListenerKeys_.forEach(unlistenByKey);\n      this.layerGroupPropertyListenerKeys_ = null;\n    }\n    const layerGroup = this.getLayerGroup();\n    if (layerGroup) {\n      this.layerGroupPropertyListenerKeys_ = [\n        listen(\n          layerGroup, ObjectEventType.PROPERTYCHANGE,\n          this.render, this),\n        listen(\n          layerGroup, EventType.CHANGE,\n          this.render, this)\n      ];\n    }\n    this.render();\n  }\n\n  /**\n   * @return {boolean} Is rendered.\n   */\n  isRendered() {\n    return !!this.frameState_;\n  }\n\n  /**\n   * Requests an immediate render in a synchronous manner.\n   * @api\n   */\n  renderSync() {\n    if (this.animationDelayKey_) {\n      cancelAnimationFrame(this.animationDelayKey_);\n    }\n    this.animationDelay_();\n  }\n\n  /**\n   * Request a map rendering (at the next animation frame).\n   * @api\n   */\n  render() {\n    if (this.animationDelayKey_ === undefined) {\n      this.animationDelayKey_ = requestAnimationFrame(this.animationDelay_);\n    }\n  }\n\n  /**\n   * Remove the given control from the map.\n   * @param {import(\"./control/Control.js\").default} control Control.\n   * @return {import(\"./control/Control.js\").default|undefined} The removed control (or undefined\n   *     if the control was not found).\n   * @api\n   */\n  removeControl(control) {\n    return this.getControls().remove(control);\n  }\n\n  /**\n   * Remove the given interaction from the map.\n   * @param {import(\"./interaction/Interaction.js\").default} interaction Interaction to remove.\n   * @return {import(\"./interaction/Interaction.js\").default|undefined} The removed interaction (or\n   *     undefined if the interaction was not found).\n   * @api\n   */\n  removeInteraction(interaction) {\n    return this.getInteractions().remove(interaction);\n  }\n\n  /**\n   * Removes the given layer from the map.\n   * @param {import(\"./layer/Base.js\").default} layer Layer.\n   * @return {import(\"./layer/Base.js\").default|undefined} The removed layer (or undefined if the\n   *     layer was not found).\n   * @api\n   */\n  removeLayer(layer) {\n    const layers = this.getLayerGroup().getLayers();\n    return layers.remove(layer);\n  }\n\n  /**\n   * Remove the given overlay from the map.\n   * @param {import(\"./Overlay.js\").default} overlay Overlay.\n   * @return {import(\"./Overlay.js\").default|undefined} The removed overlay (or undefined\n   *     if the overlay was not found).\n   * @api\n   */\n  removeOverlay(overlay) {\n    return this.getOverlays().remove(overlay);\n  }\n\n  /**\n   * @param {number} time Time.\n   * @private\n   */\n  renderFrame_(time) {\n    let viewState;\n\n    const size = this.getSize();\n    const view = this.getView();\n    const extent = createEmpty();\n    const previousFrameState = this.frameState_;\n    /** @type {?FrameState} */\n    let frameState = null;\n    if (size !== undefined && hasArea(size) && view && view.isDef()) {\n      const viewHints = view.getHints(this.frameState_ ? this.frameState_.viewHints : undefined);\n      const layerStatesArray = this.getLayerGroup().getLayerStatesArray();\n      const layerStates = {};\n      for (let i = 0, ii = layerStatesArray.length; i < ii; ++i) {\n        layerStates[getUid(layerStatesArray[i].layer)] = layerStatesArray[i];\n      }\n      viewState = view.getState(this.pixelRatio_);\n      frameState = /** @type {FrameState} */ ({\n        animate: false,\n        coordinateToPixelTransform: this.coordinateToPixelTransform_,\n        extent: extent,\n        focus: this.focus_ ? this.focus_ : viewState.center,\n        index: this.frameIndex_++,\n        layerStates: layerStates,\n        layerStatesArray: layerStatesArray,\n        pixelRatio: this.pixelRatio_,\n        pixelToCoordinateTransform: this.pixelToCoordinateTransform_,\n        postRenderFunctions: [],\n        size: size,\n        skippedFeatureUids: this.skippedFeatureUids_,\n        tileQueue: this.tileQueue_,\n        time: time,\n        usedTiles: {},\n        viewState: viewState,\n        viewHints: viewHints,\n        wantedTiles: {}\n      });\n    }\n\n    if (frameState) {\n      frameState.extent = getForViewAndSize(viewState.center,\n        viewState.resolution, viewState.rotation, frameState.size, extent);\n    }\n\n    this.frameState_ = frameState;\n    this.renderer_.renderFrame(frameState);\n\n    if (frameState) {\n      if (frameState.animate) {\n        this.render();\n      }\n      Array.prototype.push.apply(this.postRenderFunctions_, frameState.postRenderFunctions);\n\n      if (previousFrameState) {\n        const moveStart = !this.previousExtent_ ||\n                    (!isEmpty(this.previousExtent_) &&\n                    !equals(frameState.extent, this.previousExtent_));\n        if (moveStart) {\n          this.dispatchEvent(\n            new MapEvent(MapEventType.MOVESTART, this, previousFrameState));\n          this.previousExtent_ = createOrUpdateEmpty(this.previousExtent_);\n        }\n      }\n\n      const idle = this.previousExtent_ &&\n          !frameState.viewHints[ViewHint.ANIMATING] &&\n          !frameState.viewHints[ViewHint.INTERACTING] &&\n          !equals(frameState.extent, this.previousExtent_);\n\n      if (idle) {\n        this.dispatchEvent(new MapEvent(MapEventType.MOVEEND, this, frameState));\n        clone(frameState.extent, this.previousExtent_);\n      }\n    }\n\n    this.dispatchEvent(new MapEvent(MapEventType.POSTRENDER, this, frameState));\n\n    setTimeout(this.handlePostRender.bind(this), 0);\n\n  }\n\n  /**\n   * Sets the layergroup of this map.\n   * @param {LayerGroup} layerGroup A layer group containing the layers in this map.\n   * @observable\n   * @api\n   */\n  setLayerGroup(layerGroup) {\n    this.set(MapProperty.LAYERGROUP, layerGroup);\n  }\n\n  /**\n   * Set the size of this map.\n   * @param {import(\"./size.js\").Size|undefined} size The size in pixels of the map in the DOM.\n   * @observable\n   * @api\n   */\n  setSize(size) {\n    this.set(MapProperty.SIZE, size);\n  }\n\n  /**\n   * Set the target element to render this map into.\n   * @param {HTMLElement|string|undefined} target The Element or id of the Element\n   *     that the map is rendered in.\n   * @observable\n   * @api\n   */\n  setTarget(target) {\n    this.set(MapProperty.TARGET, target);\n  }\n\n  /**\n   * Set the view for this map.\n   * @param {View} view The view that controls this map.\n   * @observable\n   * @api\n   */\n  setView(view) {\n    this.set(MapProperty.VIEW, view);\n  }\n\n  /**\n   * @param {import(\"./Feature.js\").default} feature Feature.\n   */\n  skipFeature(feature) {\n    this.skippedFeatureUids_[getUid(feature)] = true;\n    this.render();\n  }\n\n  /**\n   * Force a recalculation of the map viewport size.  This should be called when\n   * third-party code changes the size of the map viewport.\n   * @api\n   */\n  updateSize() {\n    const targetElement = this.getTargetElement();\n\n    if (!targetElement) {\n      this.setSize(undefined);\n    } else {\n      const computedStyle = getComputedStyle(targetElement);\n      this.setSize([\n        targetElement.offsetWidth -\n            parseFloat(computedStyle['borderLeftWidth']) -\n            parseFloat(computedStyle['paddingLeft']) -\n            parseFloat(computedStyle['paddingRight']) -\n            parseFloat(computedStyle['borderRightWidth']),\n        targetElement.offsetHeight -\n            parseFloat(computedStyle['borderTopWidth']) -\n            parseFloat(computedStyle['paddingTop']) -\n            parseFloat(computedStyle['paddingBottom']) -\n            parseFloat(computedStyle['borderBottomWidth'])\n      ]);\n    }\n  }\n\n  /**\n   * @param {import(\"./Feature.js\").default} feature Feature.\n   */\n  unskipFeature(feature) {\n    delete this.skippedFeatureUids_[getUid(feature)];\n    this.render();\n  }\n}\n\n\n/**\n * @param {MapOptions} options Map options.\n * @return {MapOptionsInternal} Internal map options.\n */\nfunction createOptionsInternal(options) {\n\n  /**\n   * @type {HTMLElement|Document}\n   */\n  let keyboardEventTarget = null;\n  if (options.keyboardEventTarget !== undefined) {\n    keyboardEventTarget = typeof options.keyboardEventTarget === 'string' ?\n      document.getElementById(options.keyboardEventTarget) :\n      options.keyboardEventTarget;\n  }\n\n  /**\n   * @type {Object<string, *>}\n   */\n  const values = {};\n\n  const layerGroup = options.layers && typeof /** @type {?} */ (options.layers).getLayers === 'function' ?\n    /** @type {LayerGroup} */ (options.layers) : new LayerGroup({layers: /** @type {Collection} */ (options.layers)});\n  values[MapProperty.LAYERGROUP] = layerGroup;\n\n  values[MapProperty.TARGET] = options.target;\n\n  values[MapProperty.VIEW] = options.view !== undefined ?\n    options.view : new View();\n\n  let controls;\n  if (options.controls !== undefined) {\n    if (Array.isArray(options.controls)) {\n      controls = new Collection(options.controls.slice());\n    } else {\n      assert(typeof /** @type {?} */ (options.controls).getArray === 'function',\n        47); // Expected `controls` to be an array or an `import(\"./Collection.js\").Collection`\n      controls = /** @type {Collection} */ (options.controls);\n    }\n  }\n\n  let interactions;\n  if (options.interactions !== undefined) {\n    if (Array.isArray(options.interactions)) {\n      interactions = new Collection(options.interactions.slice());\n    } else {\n      assert(typeof /** @type {?} */ (options.interactions).getArray === 'function',\n        48); // Expected `interactions` to be an array or an `import(\"./Collection.js\").Collection`\n      interactions = /** @type {Collection} */ (options.interactions);\n    }\n  }\n\n  let overlays;\n  if (options.overlays !== undefined) {\n    if (Array.isArray(options.overlays)) {\n      overlays = new Collection(options.overlays.slice());\n    } else {\n      assert(typeof /** @type {?} */ (options.overlays).getArray === 'function',\n        49); // Expected `overlays` to be an array or an `import(\"./Collection.js\").Collection`\n      overlays = options.overlays;\n    }\n  } else {\n    overlays = new Collection();\n  }\n\n  return {\n    controls: controls,\n    interactions: interactions,\n    keyboardEventTarget: keyboardEventTarget,\n    overlays: overlays,\n    values: values\n  };\n\n}\nexport default PluggableMap;\n\n/**\n * @param  {Array<import(\"./layer/Base.js\").default>} layers Layers.\n * @return {boolean} Layers have sources that are still loading.\n */\nfunction getLoading(layers) {\n  for (let i = 0, ii = layers.length; i < ii; ++i) {\n    const layer = layers[i];\n    if (typeof /** @type {?} */ (layer).getLayers === 'function') {\n      return getLoading(/** @type {LayerGroup} */ (layer).getLayers().getArray());\n    } else {\n      const source = /** @type {import(\"./layer/Layer.js\").default} */ (\n        layer).getSource();\n      if (source && source.loading) {\n        return true;\n      }\n    }\n  }\n  return false;\n}\n","/**\n * @module ol/control/Control\n */\nimport {VOID} from '../functions.js';\nimport MapEventType from '../MapEventType.js';\nimport BaseObject from '../Object.js';\nimport {removeNode} from '../dom.js';\nimport {listen, unlistenByKey} from '../events.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {HTMLElement} [element] The element is the control's\n * container element. This only needs to be specified if you're developing\n * a custom control.\n * @property {function(import(\"../MapEvent.js\").default)} [render] Function called when\n * the control should be re-rendered. This is called in a `requestAnimationFrame`\n * callback.\n * @property {HTMLElement|string} [target] Specify a target if you want\n * the control to be rendered outside of the map's viewport.\n */\n\n\n/**\n * @classdesc\n * A control is a visible widget with a DOM element in a fixed position on the\n * screen. They can involve user input (buttons), or be informational only;\n * the position is determined using CSS. By default these are placed in the\n * container with CSS class name `ol-overlaycontainer-stopevent`, but can use\n * any outside DOM element.\n *\n * This is the base class for controls. You can use it for simple custom\n * controls by creating the element with listeners, creating an instance:\n * ```js\n * var myControl = new Control({element: myElement});\n * ```\n * and then adding this to the map.\n *\n * The main advantage of having this as a control rather than a simple separate\n * DOM element is that preventing propagation is handled for you. Controls\n * will also be objects in a {@link module:ol/Collection~Collection}, so you can use their methods.\n *\n * You can also extend this base for your own control class. See\n * examples/custom-controls for an example of how to do this.\n *\n * @api\n */\nclass Control extends BaseObject {\n\n  /**\n   * @param {Options} options Control options.\n   */\n  constructor(options) {\n\n    super();\n\n    /**\n     * @protected\n     * @type {HTMLElement}\n     */\n    this.element = options.element ? options.element : null;\n\n    /**\n     * @private\n     * @type {HTMLElement}\n     */\n    this.target_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../PluggableMap.js\").default}\n     */\n    this.map_ = null;\n\n    /**\n     * @protected\n     * @type {!Array<import(\"../events.js\").EventsKey>}\n     */\n    this.listenerKeys = [];\n\n    /**\n     * @type {function(import(\"../MapEvent.js\").default)}\n     */\n    this.render = options.render ? options.render : VOID;\n\n    if (options.target) {\n      this.setTarget(options.target);\n    }\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    removeNode(this.element);\n    super.disposeInternal();\n  }\n\n  /**\n   * Get the map associated with this control.\n   * @return {import(\"../PluggableMap.js\").default} Map.\n   * @api\n   */\n  getMap() {\n    return this.map_;\n  }\n\n  /**\n   * Remove the control from its current map and attach it to the new map.\n   * Subclasses may set up event handlers to get notified about changes to\n   * the map here.\n   * @param {import(\"../PluggableMap.js\").default} map Map.\n   * @api\n   */\n  setMap(map) {\n    if (this.map_) {\n      removeNode(this.element);\n    }\n    for (let i = 0, ii = this.listenerKeys.length; i < ii; ++i) {\n      unlistenByKey(this.listenerKeys[i]);\n    }\n    this.listenerKeys.length = 0;\n    this.map_ = map;\n    if (this.map_) {\n      const target = this.target_ ?\n        this.target_ : map.getOverlayContainerStopEvent();\n      target.appendChild(this.element);\n      if (this.render !== VOID) {\n        this.listenerKeys.push(listen(map,\n          MapEventType.POSTRENDER, this.render, this));\n      }\n      map.render();\n    }\n  }\n\n  /**\n   * This function is used to set a target element for the control. It has no\n   * effect if it is called after the control has been added to the map (i.e.\n   * after `setMap` is called on the control). If no `target` is set in the\n   * options passed to the control constructor and if `setTarget` is not called\n   * then the control is added to the map's overlay container.\n   * @param {HTMLElement|string} target Target.\n   * @api\n   */\n  setTarget(target) {\n    this.target_ = typeof target === 'string' ?\n      document.getElementById(target) :\n      target;\n  }\n}\n\n\nexport default Control;\n","/**\n * @module ol/css\n */\n\n\n/**\n * The CSS class for hidden feature.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_HIDDEN = 'ol-hidden';\n\n\n/**\n * The CSS class that we'll give the DOM elements to have them selectable.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_SELECTABLE = 'ol-selectable';\n\n\n/**\n * The CSS class that we'll give the DOM elements to have them unselectable.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_UNSELECTABLE = 'ol-unselectable';\n\n\n/**\n * The CSS class for unsupported feature.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_UNSUPPORTED = 'ol-unsupported';\n\n\n/**\n * The CSS class for controls.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_CONTROL = 'ol-control';\n\n\n/**\n * The CSS class that we'll give the DOM elements that are collapsed, i.e.\n * to those elements which usually can be expanded.\n *\n * @const\n * @type {string}\n */\nexport const CLASS_COLLAPSED = 'ol-collapsed';\n\n\n/**\n * Get the list of font families from a font spec.  Note that this doesn't work\n * for font families that have commas in them.\n * @param {string} The CSS font property.\n * @return {Object<string>} The font families (or null if the input spec is invalid).\n */\nexport const getFontFamilies = (function() {\n  let style;\n  const cache = {};\n  return function(font) {\n    if (!style) {\n      style = document.createElement('div').style;\n    }\n    if (!(font in cache)) {\n      style.font = font;\n      const family = style.fontFamily;\n      style.font = '';\n      if (!family) {\n        return null;\n      }\n      cache[font] = family.split(/,\\s?/);\n    }\n    return cache[font];\n  };\n})();\n","/**\n * @module ol/layer/Layer\n */\nimport {listen, unlistenByKey} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {getUid} from '../util.js';\nimport {getChangeEventType} from '../Object.js';\nimport BaseLayer from './Base.js';\nimport LayerProperty from './Property.js';\nimport {assign} from '../obj.js';\nimport RenderEventType from '../render/EventType.js';\nimport SourceState from '../source/State.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {import(\"../extent.js\").Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position. When `undefined`, a `zIndex` of 0 is assumed\n * for layers that are added to the map's `layers` collection, or `Infinity` when the layer's `setMap()`\n * method was used.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n * @property {import(\"../source/Source.js\").default} [source] Source for this layer.  If not provided to the constructor,\n * the source can be set by calling {@link module:ol/layer/Layer#setSource layer.setSource(source)} after\n * construction.\n * @property {import(\"../PluggableMap.js\").default} [map] Map.\n */\n\n\n/**\n * @typedef {Object} State\n * @property {import(\"./Base.js\").default} layer\n * @property {number} opacity\n * @property {SourceState} sourceState\n * @property {boolean} visible\n * @property {boolean} managed\n * @property {import(\"../extent.js\").Extent} [extent]\n * @property {number} zIndex\n * @property {number} maxResolution\n * @property {number} minResolution\n */\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * A visual representation of raster or vector map data.\n * Layers group together those properties that pertain to how the data is to be\n * displayed, irrespective of the source of that data.\n *\n * Layers are usually added to a map with {@link module:ol/Map#addLayer}. Components\n * like {@link module:ol/interaction/Select~Select} use unmanaged layers\n * internally. These unmanaged layers are associated with the map using\n * {@link module:ol/layer/Layer~Layer#setMap} instead.\n *\n * A generic `change` event is fired when the state of the source changes.\n *\n * @fires import(\"../render/Event.js\").RenderEvent\n */\nclass Layer extends BaseLayer {\n  /**\n   * @param {Options} options Layer options.\n   */\n  constructor(options) {\n\n    const baseOptions = assign({}, options);\n    delete baseOptions.source;\n\n    super(baseOptions);\n\n    /**\n     * @private\n     * @type {?import(\"../events.js\").EventsKey}\n     */\n    this.mapPrecomposeKey_ = null;\n\n    /**\n     * @private\n     * @type {?import(\"../events.js\").EventsKey}\n     */\n    this.mapRenderKey_ = null;\n\n    /**\n     * @private\n     * @type {?import(\"../events.js\").EventsKey}\n     */\n    this.sourceChangeKey_ = null;\n\n    if (options.map) {\n      this.setMap(options.map);\n    }\n\n    listen(this,\n      getChangeEventType(LayerProperty.SOURCE),\n      this.handleSourcePropertyChange_, this);\n\n    const source = options.source ? options.source : null;\n    this.setSource(source);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getLayersArray(opt_array) {\n    const array = opt_array ? opt_array : [];\n    array.push(this);\n    return array;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getLayerStatesArray(opt_states) {\n    const states = opt_states ? opt_states : [];\n    states.push(this.getLayerState());\n    return states;\n  }\n\n  /**\n   * Get the layer source.\n   * @return {import(\"../source/Source.js\").default} The layer source (or `null` if not yet set).\n   * @observable\n   * @api\n   */\n  getSource() {\n    const source = this.get(LayerProperty.SOURCE);\n    return (\n      /** @type {import(\"../source/Source.js\").default} */ (source) || null\n    );\n  }\n\n  /**\n    * @inheritDoc\n    */\n  getSourceState() {\n    const source = this.getSource();\n    return !source ? SourceState.UNDEFINED : source.getState();\n  }\n\n  /**\n   * @private\n   */\n  handleSourceChange_() {\n    this.changed();\n  }\n\n  /**\n   * @private\n   */\n  handleSourcePropertyChange_() {\n    if (this.sourceChangeKey_) {\n      unlistenByKey(this.sourceChangeKey_);\n      this.sourceChangeKey_ = null;\n    }\n    const source = this.getSource();\n    if (source) {\n      this.sourceChangeKey_ = listen(source,\n        EventType.CHANGE, this.handleSourceChange_, this);\n    }\n    this.changed();\n  }\n\n  /**\n   * Sets the layer to be rendered on top of other layers on a map. The map will\n   * not manage this layer in its layers collection, and the callback in\n   * {@link module:ol/Map#forEachLayerAtPixel} will receive `null` as layer. This\n   * is useful for temporary layers. To remove an unmanaged layer from the map,\n   * use `#setMap(null)`.\n   *\n   * To add the layer to a map and have it managed by the map, use\n   * {@link module:ol/Map#addLayer} instead.\n   * @param {import(\"../PluggableMap.js\").default} map Map.\n   * @api\n   */\n  setMap(map) {\n    if (this.mapPrecomposeKey_) {\n      unlistenByKey(this.mapPrecomposeKey_);\n      this.mapPrecomposeKey_ = null;\n    }\n    if (!map) {\n      this.changed();\n    }\n    if (this.mapRenderKey_) {\n      unlistenByKey(this.mapRenderKey_);\n      this.mapRenderKey_ = null;\n    }\n    if (map) {\n      this.mapPrecomposeKey_ = listen(map, RenderEventType.PRECOMPOSE, function(evt) {\n        const renderEvent = /** @type {import(\"../render/Event.js\").default} */ (evt);\n        const layerState = this.getLayerState();\n        layerState.managed = false;\n        if (this.getZIndex() === undefined) {\n          layerState.zIndex = Infinity;\n        }\n        renderEvent.frameState.layerStatesArray.push(layerState);\n        renderEvent.frameState.layerStates[getUid(this)] = layerState;\n      }, this);\n      this.mapRenderKey_ = listen(this, EventType.CHANGE, map.render, map);\n      this.changed();\n    }\n  }\n\n  /**\n   * Set the layer source.\n   * @param {import(\"../source/Source.js\").default} source The layer source.\n   * @observable\n   * @api\n   */\n  setSource(source) {\n    this.set(LayerProperty.SOURCE, source);\n  }\n}\n\n\n/**\n * Return `true` if the layer is visible, and if the passed resolution is\n * between the layer's minResolution and maxResolution. The comparison is\n * inclusive for `minResolution` and exclusive for `maxResolution`.\n * @param {State} layerState Layer state.\n * @param {number} resolution Resolution.\n * @return {boolean} The layer is visible at the given resolution.\n */\nexport function visibleAtResolution(layerState, resolution) {\n  return layerState.visible && resolution >= layerState.minResolution &&\n      resolution < layerState.maxResolution;\n}\n\n\nexport default Layer;\n","/**\n * @module ol/control/Attribution\n */\nimport {equals} from '../array.js';\nimport Control from './Control.js';\nimport {CLASS_CONTROL, CLASS_UNSELECTABLE, CLASS_COLLAPSED} from '../css.js';\nimport {removeChildren, replaceNode} from '../dom.js';\nimport {listen} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {visibleAtResolution} from '../layer/Layer.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {string} [className='ol-attribution'] CSS class name.\n * @property {HTMLElement|string} [target] Specify a target if you\n * want the control to be rendered outside of the map's\n * viewport.\n * @property {boolean} [collapsible] Specify if attributions can\n * be collapsed. If not specified, sources control this behavior with their\n * `attributionsCollapsible` setting.\n * @property {boolean} [collapsed=true] Specify if attributions should\n * be collapsed at startup.\n * @property {string} [tipLabel='Attributions'] Text label to use for the button tip.\n * @property {string} [label='i'] Text label to use for the\n * collapsed attributions button.\n * Instead of text, also an element (e.g. a `span` element) can be used.\n * @property {string|HTMLElement} [collapseLabel='»'] Text label to use\n * for the expanded attributions button.\n * Instead of text, also an element (e.g. a `span` element) can be used.\n * @property {function(import(\"../MapEvent.js\").default)} [render] Function called when\n * the control should be re-rendered. This is called in a `requestAnimationFrame`\n * callback.\n */\n\n\n/**\n * @classdesc\n * Control to show all the attributions associated with the layer sources\n * in the map. This control is one of the default controls included in maps.\n * By default it will show in the bottom right portion of the map, but this can\n * be changed by using a css selector for `.ol-attribution`.\n *\n * @api\n */\nclass Attribution extends Control {\n\n  /**\n   * @param {Options=} opt_options Attribution options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super({\n      element: document.createElement('div'),\n      render: options.render || render,\n      target: options.target\n    });\n\n    /**\n     * @private\n     * @type {HTMLElement}\n     */\n    this.ulElement_ = document.createElement('ul');\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.collapsed_ = options.collapsed !== undefined ? options.collapsed : true;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.overrideCollapsible_ = options.collapsible !== undefined;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.collapsible_ = options.collapsible !== undefined ?\n      options.collapsible : true;\n\n    if (!this.collapsible_) {\n      this.collapsed_ = false;\n    }\n\n    const className = options.className !== undefined ? options.className : 'ol-attribution';\n\n    const tipLabel = options.tipLabel !== undefined ? options.tipLabel : 'Attributions';\n\n    const collapseLabel = options.collapseLabel !== undefined ? options.collapseLabel : '\\u00BB';\n\n    if (typeof collapseLabel === 'string') {\n      /**\n       * @private\n       * @type {HTMLElement}\n       */\n      this.collapseLabel_ = document.createElement('span');\n      this.collapseLabel_.textContent = collapseLabel;\n    } else {\n      this.collapseLabel_ = collapseLabel;\n    }\n\n    const label = options.label !== undefined ? options.label : 'i';\n\n    if (typeof label === 'string') {\n      /**\n       * @private\n       * @type {HTMLElement}\n       */\n      this.label_ = document.createElement('span');\n      this.label_.textContent = label;\n    } else {\n      this.label_ = label;\n    }\n\n\n    const activeLabel = (this.collapsible_ && !this.collapsed_) ?\n      this.collapseLabel_ : this.label_;\n    const button = document.createElement('button');\n    button.setAttribute('type', 'button');\n    button.title = tipLabel;\n    button.appendChild(activeLabel);\n\n    listen(button, EventType.CLICK, this.handleClick_, this);\n\n    const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL +\n        (this.collapsed_ && this.collapsible_ ? ' ' + CLASS_COLLAPSED : '') +\n        (this.collapsible_ ? '' : ' ol-uncollapsible');\n    const element = this.element;\n    element.className = cssClasses;\n    element.appendChild(this.ulElement_);\n    element.appendChild(button);\n\n    /**\n     * A list of currently rendered resolutions.\n     * @type {Array<string>}\n     * @private\n     */\n    this.renderedAttributions_ = [];\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.renderedVisible_ = true;\n\n  }\n\n  /**\n   * Collect a list of visible attributions and set the collapsible state.\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   * @return {Array<string>} Attributions.\n   * @private\n   */\n  collectSourceAttributions_(frameState) {\n    /**\n     * Used to determine if an attribution already exists.\n     * @type {!Object<string, boolean>}\n     */\n    const lookup = {};\n\n    /**\n     * A list of visible attributions.\n     * @type {Array<string>}\n     */\n    const visibleAttributions = [];\n\n    const layerStatesArray = frameState.layerStatesArray;\n    const resolution = frameState.viewState.resolution;\n    for (let i = 0, ii = layerStatesArray.length; i < ii; ++i) {\n      const layerState = layerStatesArray[i];\n      if (!visibleAtResolution(layerState, resolution)) {\n        continue;\n      }\n\n      const source = /** @type {import(\"../layer/Layer.js\").default} */ (layerState.layer).getSource();\n      if (!source) {\n        continue;\n      }\n\n      const attributionGetter = source.getAttributions();\n      if (!attributionGetter) {\n        continue;\n      }\n\n      const attributions = attributionGetter(frameState);\n      if (!attributions) {\n        continue;\n      }\n\n      if (!this.overrideCollapsible_ && source.getAttributionsCollapsible() === false) {\n        this.setCollapsible(false);\n      }\n\n      if (Array.isArray(attributions)) {\n        for (let j = 0, jj = attributions.length; j < jj; ++j) {\n          if (!(attributions[j] in lookup)) {\n            visibleAttributions.push(attributions[j]);\n            lookup[attributions[j]] = true;\n          }\n        }\n      } else {\n        if (!(attributions in lookup)) {\n          visibleAttributions.push(attributions);\n          lookup[attributions] = true;\n        }\n      }\n    }\n    return visibleAttributions;\n  }\n\n  /**\n   * @private\n   * @param {?import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   */\n  updateElement_(frameState) {\n    if (!frameState) {\n      if (this.renderedVisible_) {\n        this.element.style.display = 'none';\n        this.renderedVisible_ = false;\n      }\n      return;\n    }\n\n    const attributions = this.collectSourceAttributions_(frameState);\n\n    const visible = attributions.length > 0;\n    if (this.renderedVisible_ != visible) {\n      this.element.style.display = visible ? '' : 'none';\n      this.renderedVisible_ = visible;\n    }\n\n    if (equals(attributions, this.renderedAttributions_)) {\n      return;\n    }\n\n    removeChildren(this.ulElement_);\n\n    // append the attributions\n    for (let i = 0, ii = attributions.length; i < ii; ++i) {\n      const element = document.createElement('li');\n      element.innerHTML = attributions[i];\n      this.ulElement_.appendChild(element);\n    }\n\n    this.renderedAttributions_ = attributions;\n  }\n\n  /**\n   * @param {MouseEvent} event The event to handle\n   * @private\n   */\n  handleClick_(event) {\n    event.preventDefault();\n    this.handleToggle_();\n  }\n\n  /**\n   * @private\n   */\n  handleToggle_() {\n    this.element.classList.toggle(CLASS_COLLAPSED);\n    if (this.collapsed_) {\n      replaceNode(this.collapseLabel_, this.label_);\n    } else {\n      replaceNode(this.label_, this.collapseLabel_);\n    }\n    this.collapsed_ = !this.collapsed_;\n  }\n\n  /**\n   * Return `true` if the attribution is collapsible, `false` otherwise.\n   * @return {boolean} True if the widget is collapsible.\n   * @api\n   */\n  getCollapsible() {\n    return this.collapsible_;\n  }\n\n  /**\n   * Set whether the attribution should be collapsible.\n   * @param {boolean} collapsible True if the widget is collapsible.\n   * @api\n   */\n  setCollapsible(collapsible) {\n    if (this.collapsible_ === collapsible) {\n      return;\n    }\n    this.collapsible_ = collapsible;\n    this.element.classList.toggle('ol-uncollapsible');\n    if (!collapsible && this.collapsed_) {\n      this.handleToggle_();\n    }\n  }\n\n  /**\n   * Collapse or expand the attribution according to the passed parameter. Will\n   * not do anything if the attribution isn't collapsible or if the current\n   * collapsed state is already the one requested.\n   * @param {boolean} collapsed True if the widget is collapsed.\n   * @api\n   */\n  setCollapsed(collapsed) {\n    if (!this.collapsible_ || this.collapsed_ === collapsed) {\n      return;\n    }\n    this.handleToggle_();\n  }\n\n  /**\n   * Return `true` when the attribution is currently collapsed or `false`\n   * otherwise.\n   * @return {boolean} True if the widget is collapsed.\n   * @api\n   */\n  getCollapsed() {\n    return this.collapsed_;\n  }\n}\n\n\n/**\n * Update the attribution element.\n * @param {import(\"../MapEvent.js\").default} mapEvent Map event.\n * @this {Attribution}\n * @api\n */\nexport function render(mapEvent) {\n  this.updateElement_(mapEvent.frameState);\n}\n\n\nexport default Attribution;\n","/**\n * @module ol/control/Rotate\n */\nimport Control from './Control.js';\nimport {CLASS_CONTROL, CLASS_HIDDEN, CLASS_UNSELECTABLE} from '../css.js';\nimport {easeOut} from '../easing.js';\nimport {listen} from '../events.js';\nimport EventType from '../events/EventType.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {string} [className='ol-rotate'] CSS class name.\n * @property {string|HTMLElement} [label='⇧'] Text label to use for the rotate button.\n * Instead of text, also an element (e.g. a `span` element) can be used.\n * @property {string} [tipLabel='Reset rotation'] Text label to use for the rotate tip.\n * @property {number} [duration=250] Animation duration in milliseconds.\n * @property {boolean} [autoHide=true] Hide the control when rotation is 0.\n * @property {function(import(\"../MapEvent.js\").default)} [render] Function called when the control should\n * be re-rendered. This is called in a `requestAnimationFrame` callback.\n * @property {function()} [resetNorth] Function called when the control is clicked.\n * This will override the default `resetNorth`.\n * @property {HTMLElement|string} [target] Specify a target if you want the control to be\n * rendered outside of the map's viewport.\n */\n\n\n/**\n * @classdesc\n * A button control to reset rotation to 0.\n * To style this control use css selector `.ol-rotate`. A `.ol-hidden` css\n * selector is added to the button when the rotation is 0.\n *\n * @api\n */\nclass Rotate extends Control {\n\n  /**\n   * @param {Options=} opt_options Rotate options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super({\n      element: document.createElement('div'),\n      render: options.render || render,\n      target: options.target\n    });\n\n    const className = options.className !== undefined ? options.className : 'ol-rotate';\n\n    const label = options.label !== undefined ? options.label : '\\u21E7';\n\n    /**\n     * @type {HTMLElement}\n     * @private\n     */\n    this.label_ = null;\n\n    if (typeof label === 'string') {\n      this.label_ = document.createElement('span');\n      this.label_.className = 'ol-compass';\n      this.label_.textContent = label;\n    } else {\n      this.label_ = label;\n      this.label_.classList.add('ol-compass');\n    }\n\n    const tipLabel = options.tipLabel ? options.tipLabel : 'Reset rotation';\n\n    const button = document.createElement('button');\n    button.className = className + '-reset';\n    button.setAttribute('type', 'button');\n    button.title = tipLabel;\n    button.appendChild(this.label_);\n\n    listen(button, EventType.CLICK, this.handleClick_, this);\n\n    const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL;\n    const element = this.element;\n    element.className = cssClasses;\n    element.appendChild(button);\n\n    this.callResetNorth_ = options.resetNorth ? options.resetNorth : undefined;\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.autoHide_ = options.autoHide !== undefined ? options.autoHide : true;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.rotation_ = undefined;\n\n    if (this.autoHide_) {\n      this.element.classList.add(CLASS_HIDDEN);\n    }\n\n  }\n\n  /**\n   * @param {MouseEvent} event The event to handle\n   * @private\n   */\n  handleClick_(event) {\n    event.preventDefault();\n    if (this.callResetNorth_ !== undefined) {\n      this.callResetNorth_();\n    } else {\n      this.resetNorth_();\n    }\n  }\n\n  /**\n   * @private\n   */\n  resetNorth_() {\n    const map = this.getMap();\n    const view = map.getView();\n    if (!view) {\n      // the map does not have a view, so we can't act\n      // upon it\n      return;\n    }\n    if (view.getRotation() !== undefined) {\n      if (this.duration_ > 0) {\n        view.animate({\n          rotation: 0,\n          duration: this.duration_,\n          easing: easeOut\n        });\n      } else {\n        view.setRotation(0);\n      }\n    }\n  }\n}\n\n\n/**\n * Update the rotate control element.\n * @param {import(\"../MapEvent.js\").default} mapEvent Map event.\n * @this {Rotate}\n * @api\n */\nexport function render(mapEvent) {\n  const frameState = mapEvent.frameState;\n  if (!frameState) {\n    return;\n  }\n  const rotation = frameState.viewState.rotation;\n  if (rotation != this.rotation_) {\n    const transform = 'rotate(' + rotation + 'rad)';\n    if (this.autoHide_) {\n      const contains = this.element.classList.contains(CLASS_HIDDEN);\n      if (!contains && rotation === 0) {\n        this.element.classList.add(CLASS_HIDDEN);\n      } else if (contains && rotation !== 0) {\n        this.element.classList.remove(CLASS_HIDDEN);\n      }\n    }\n    this.label_.style.msTransform = transform;\n    this.label_.style.webkitTransform = transform;\n    this.label_.style.transform = transform;\n  }\n  this.rotation_ = rotation;\n}\n\nexport default Rotate;\n","/**\n * @module ol/control/Zoom\n */\nimport {listen} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport Control from './Control.js';\nimport {CLASS_CONTROL, CLASS_UNSELECTABLE} from '../css.js';\nimport {easeOut} from '../easing.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [duration=250] Animation duration in milliseconds.\n * @property {string} [className='ol-zoom'] CSS class name.\n * @property {string|HTMLElement} [zoomInLabel='+'] Text label to use for the zoom-in\n * button. Instead of text, also an element (e.g. a `span` element) can be used.\n * @property {string|HTMLElement} [zoomOutLabel='-'] Text label to use for the zoom-out button.\n * Instead of text, also an element (e.g. a `span` element) can be used.\n * @property {string} [zoomInTipLabel='Zoom in'] Text label to use for the button tip.\n * @property {string} [zoomOutTipLabel='Zoom out'] Text label to use for the button tip.\n * @property {number} [delta=1] The zoom delta applied on each click.\n * @property {HTMLElement|string} [target] Specify a target if you want the control to be\n * rendered outside of the map's viewport.\n */\n\n\n/**\n * @classdesc\n * A control with 2 buttons, one for zoom in and one for zoom out.\n * This control is one of the default controls of a map. To style this control\n * use css selectors `.ol-zoom-in` and `.ol-zoom-out`.\n *\n * @api\n */\nclass Zoom extends Control {\n\n  /**\n   * @param {Options=} opt_options Zoom options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super({\n      element: document.createElement('div'),\n      target: options.target\n    });\n\n    const className = options.className !== undefined ? options.className : 'ol-zoom';\n\n    const delta = options.delta !== undefined ? options.delta : 1;\n\n    const zoomInLabel = options.zoomInLabel !== undefined ? options.zoomInLabel : '+';\n    const zoomOutLabel = options.zoomOutLabel !== undefined ? options.zoomOutLabel : '\\u2212';\n\n    const zoomInTipLabel = options.zoomInTipLabel !== undefined ?\n      options.zoomInTipLabel : 'Zoom in';\n    const zoomOutTipLabel = options.zoomOutTipLabel !== undefined ?\n      options.zoomOutTipLabel : 'Zoom out';\n\n    const inElement = document.createElement('button');\n    inElement.className = className + '-in';\n    inElement.setAttribute('type', 'button');\n    inElement.title = zoomInTipLabel;\n    inElement.appendChild(\n      typeof zoomInLabel === 'string' ? document.createTextNode(zoomInLabel) : zoomInLabel\n    );\n\n    listen(inElement, EventType.CLICK, this.handleClick_.bind(this, delta));\n\n    const outElement = document.createElement('button');\n    outElement.className = className + '-out';\n    outElement.setAttribute('type', 'button');\n    outElement.title = zoomOutTipLabel;\n    outElement.appendChild(\n      typeof zoomOutLabel === 'string' ? document.createTextNode(zoomOutLabel) : zoomOutLabel\n    );\n\n    listen(outElement, EventType.CLICK, this.handleClick_.bind(this, -delta));\n\n    const cssClasses = className + ' ' + CLASS_UNSELECTABLE + ' ' + CLASS_CONTROL;\n    const element = this.element;\n    element.className = cssClasses;\n    element.appendChild(inElement);\n    element.appendChild(outElement);\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n  }\n\n  /**\n   * @param {number} delta Zoom delta.\n   * @param {MouseEvent} event The event to handle\n   * @private\n   */\n  handleClick_(delta, event) {\n    event.preventDefault();\n    this.zoomByDelta_(delta);\n  }\n\n  /**\n   * @param {number} delta Zoom delta.\n   * @private\n   */\n  zoomByDelta_(delta) {\n    const map = this.getMap();\n    const view = map.getView();\n    if (!view) {\n      // the map does not have a view, so we can't act\n      // upon it\n      return;\n    }\n    const currentResolution = view.getResolution();\n    if (currentResolution) {\n      const newResolution = view.constrainResolution(currentResolution, delta);\n      if (this.duration_ > 0) {\n        if (view.getAnimating()) {\n          view.cancelAnimations();\n        }\n        view.animate({\n          resolution: newResolution,\n          duration: this.duration_,\n          easing: easeOut\n        });\n      } else {\n        view.setResolution(newResolution);\n      }\n    }\n  }\n}\n\n\nexport default Zoom;\n","/**\n * @module ol/control/util\n */\nimport Collection from '../Collection.js';\nimport Attribution from './Attribution.js';\nimport Rotate from './Rotate.js';\nimport Zoom from './Zoom.js';\n\n\n/**\n * @typedef {Object} DefaultsOptions\n * @property {boolean} [attribution=true] Include\n * {@link module:ol/control/Attribution~Attribution}.\n * @property {import(\"./Attribution.js\").Options} [attributionOptions]\n * Options for {@link module:ol/control/Attribution~Attribution}.\n * @property {boolean} [rotate=true] Include\n * {@link module:ol/control/Rotate~Rotate}.\n * @property {import(\"./Rotate.js\").Options} [rotateOptions] Options\n * for {@link module:ol/control/Rotate~Rotate}.\n * @property {boolean} [zoom] Include {@link module:ol/control/Zoom~Zoom}.\n * @property {import(\"./Zoom.js\").Options} [zoomOptions] Options for\n * {@link module:ol/control/Zoom~Zoom}.\n * @api\n */\n\n\n/**\n * Set of controls included in maps by default. Unless configured otherwise,\n * this returns a collection containing an instance of each of the following\n * controls:\n * * {@link module:ol/control/Zoom~Zoom}\n * * {@link module:ol/control/Rotate~Rotate}\n * * {@link module:ol/control/Attribution~Attribution}\n *\n * @param {DefaultsOptions=} opt_options\n * Defaults options.\n * @return {Collection<import(\"./Control.js\").default>}\n * Controls.\n * @function module:ol/control.defaults\n * @api\n */\nexport function defaults(opt_options) {\n\n  const options = opt_options ? opt_options : {};\n\n  const controls = new Collection();\n\n  const zoomControl = options.zoom !== undefined ? options.zoom : true;\n  if (zoomControl) {\n    controls.push(new Zoom(options.zoomOptions));\n  }\n\n  const rotateControl = options.rotate !== undefined ? options.rotate : true;\n  if (rotateControl) {\n    controls.push(new Rotate(options.rotateOptions));\n  }\n\n  const attributionControl = options.attribution !== undefined ?\n    options.attribution : true;\n  if (attributionControl) {\n    controls.push(new Attribution(options.attributionOptions));\n  }\n\n  return controls;\n}\n","/**\n * @module ol/Kinetic\n */\n\n/**\n * @classdesc\n * Implementation of inertial deceleration for map movement.\n *\n * @api\n */\nclass Kinetic {\n\n  /**\n   * @param {number} decay Rate of decay (must be negative).\n   * @param {number} minVelocity Minimum velocity (pixels/millisecond).\n   * @param {number} delay Delay to consider to calculate the kinetic\n   *     initial values (milliseconds).\n   */\n  constructor(decay, minVelocity, delay) {\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.decay_ = decay;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.minVelocity_ = minVelocity;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.delay_ = delay;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.points_ = [];\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.angle_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.initialVelocity_ = 0;\n  }\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  begin() {\n    this.points_.length = 0;\n    this.angle_ = 0;\n    this.initialVelocity_ = 0;\n  }\n\n  /**\n   * @param {number} x X.\n   * @param {number} y Y.\n   */\n  update(x, y) {\n    this.points_.push(x, y, Date.now());\n  }\n\n  /**\n   * @return {boolean} Whether we should do kinetic animation.\n   */\n  end() {\n    if (this.points_.length < 6) {\n      // at least 2 points are required (i.e. there must be at least 6 elements\n      // in the array)\n      return false;\n    }\n    const delay = Date.now() - this.delay_;\n    const lastIndex = this.points_.length - 3;\n    if (this.points_[lastIndex + 2] < delay) {\n      // the last tracked point is too old, which means that the user stopped\n      // panning before releasing the map\n      return false;\n    }\n\n    // get the first point which still falls into the delay time\n    let firstIndex = lastIndex - 3;\n    while (firstIndex > 0 && this.points_[firstIndex + 2] > delay) {\n      firstIndex -= 3;\n    }\n\n    const duration = this.points_[lastIndex + 2] - this.points_[firstIndex + 2];\n    // we don't want a duration of 0 (divide by zero)\n    // we also make sure the user panned for a duration of at least one frame\n    // (1/60s) to compute sane displacement values\n    if (duration < 1000 / 60) {\n      return false;\n    }\n\n    const dx = this.points_[lastIndex] - this.points_[firstIndex];\n    const dy = this.points_[lastIndex + 1] - this.points_[firstIndex + 1];\n    this.angle_ = Math.atan2(dy, dx);\n    this.initialVelocity_ = Math.sqrt(dx * dx + dy * dy) / duration;\n    return this.initialVelocity_ > this.minVelocity_;\n  }\n\n  /**\n   * @return {number} Total distance travelled (pixels).\n   */\n  getDistance() {\n    return (this.minVelocity_ - this.initialVelocity_) / this.decay_;\n  }\n\n  /**\n   * @return {number} Angle of the kinetic panning animation (radians).\n   */\n  getAngle() {\n    return this.angle_;\n  }\n}\n\nexport default Kinetic;\n","/**\n * @module ol/interaction/Property\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  ACTIVE: 'active'\n};\n","/**\n * @module ol/interaction/Interaction\n */\nimport BaseObject from '../Object.js';\nimport {easeOut, linear} from '../easing.js';\nimport InteractionProperty from './Property.js';\nimport {clamp} from '../math.js';\n\n\n/**\n * Object literal with config options for interactions.\n * @typedef {Object} InteractionOptions\n * @property {function(import(\"../MapBrowserEvent.js\").default):boolean} handleEvent\n * Method called by the map to notify the interaction that a browser event was\n * dispatched to the map. If the function returns a falsy value, propagation of\n * the event to other interactions in the map's interactions chain will be\n * prevented (this includes functions with no explicit return).\n */\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * User actions that change the state of the map. Some are similar to controls,\n * but are not associated with a DOM element.\n * For example, {@link module:ol/interaction/KeyboardZoom~KeyboardZoom} is\n * functionally the same as {@link module:ol/control/Zoom~Zoom}, but triggered\n * by a keyboard event not a button element event.\n * Although interactions do not have a DOM element, some of them do render\n * vectors and so are visible on the screen.\n * @api\n */\nclass Interaction extends BaseObject {\n  /**\n   * @param {InteractionOptions} options Options.\n   */\n  constructor(options) {\n    super();\n\n    if (options.handleEvent) {\n      this.handleEvent = options.handleEvent;\n    }\n\n    /**\n     * @private\n     * @type {import(\"../PluggableMap.js\").default}\n     */\n    this.map_ = null;\n\n    this.setActive(true);\n  }\n\n  /**\n   * Return whether the interaction is currently active.\n   * @return {boolean} `true` if the interaction is active, `false` otherwise.\n   * @observable\n   * @api\n   */\n  getActive() {\n    return /** @type {boolean} */ (this.get(InteractionProperty.ACTIVE));\n  }\n\n  /**\n   * Get the map associated with this interaction.\n   * @return {import(\"../PluggableMap.js\").default} Map.\n   * @api\n   */\n  getMap() {\n    return this.map_;\n  }\n\n  /**\n   * Handles the {@link module:ol/MapBrowserEvent map browser event}.\n   * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n   * @return {boolean} `false` to stop event propagation.\n   * @api\n   */\n  handleEvent(mapBrowserEvent) {\n    return true;\n  }\n\n  /**\n   * Activate or deactivate the interaction.\n   * @param {boolean} active Active.\n   * @observable\n   * @api\n   */\n  setActive(active) {\n    this.set(InteractionProperty.ACTIVE, active);\n  }\n\n  /**\n   * Remove the interaction from its current map and attach it to the new map.\n   * Subclasses may set up event handlers to get notified about changes to\n   * the map here.\n   * @param {import(\"../PluggableMap.js\").default} map Map.\n   */\n  setMap(map) {\n    this.map_ = map;\n  }\n}\n\n\n/**\n * @param {import(\"../View.js\").default} view View.\n * @param {import(\"../coordinate.js\").Coordinate} delta Delta.\n * @param {number=} opt_duration Duration.\n */\nexport function pan(view, delta, opt_duration) {\n  const currentCenter = view.getCenter();\n  if (currentCenter) {\n    const center = view.constrainCenter(\n      [currentCenter[0] + delta[0], currentCenter[1] + delta[1]]);\n    if (opt_duration) {\n      view.animate({\n        duration: opt_duration,\n        easing: linear,\n        center: center\n      });\n    } else {\n      view.setCenter(center);\n    }\n  }\n}\n\n\n/**\n * @param {import(\"../View.js\").default} view View.\n * @param {number|undefined} rotation Rotation.\n * @param {import(\"../coordinate.js\").Coordinate=} opt_anchor Anchor coordinate.\n * @param {number=} opt_duration Duration.\n */\nexport function rotate(view, rotation, opt_anchor, opt_duration) {\n  rotation = view.constrainRotation(rotation, 0);\n  rotateWithoutConstraints(view, rotation, opt_anchor, opt_duration);\n}\n\n\n/**\n * @param {import(\"../View.js\").default} view View.\n * @param {number|undefined} rotation Rotation.\n * @param {import(\"../coordinate.js\").Coordinate=} opt_anchor Anchor coordinate.\n * @param {number=} opt_duration Duration.\n */\nexport function rotateWithoutConstraints(view, rotation, opt_anchor, opt_duration) {\n  if (rotation !== undefined) {\n    const currentRotation = view.getRotation();\n    const currentCenter = view.getCenter();\n    if (currentRotation !== undefined && currentCenter && opt_duration > 0) {\n      view.animate({\n        rotation: rotation,\n        anchor: opt_anchor,\n        duration: opt_duration,\n        easing: easeOut\n      });\n    } else {\n      view.rotate(rotation, opt_anchor);\n    }\n  }\n}\n\n\n/**\n * @param {import(\"../View.js\").default} view View.\n * @param {number|undefined} resolution Resolution to go to.\n * @param {import(\"../coordinate.js\").Coordinate=} opt_anchor Anchor coordinate.\n * @param {number=} opt_duration Duration.\n * @param {number=} opt_direction Zooming direction; > 0 indicates\n *     zooming out, in which case the constraints system will select\n *     the largest nearest resolution; < 0 indicates zooming in, in\n *     which case the constraints system will select the smallest\n *     nearest resolution; == 0 indicates that the zooming direction\n *     is unknown/not relevant, in which case the constraints system\n *     will select the nearest resolution. If not defined 0 is\n *     assumed.\n */\nexport function zoom(view, resolution, opt_anchor, opt_duration, opt_direction) {\n  resolution = view.constrainResolution(resolution, 0, opt_direction);\n  zoomWithoutConstraints(view, resolution, opt_anchor, opt_duration);\n}\n\n\n/**\n * @param {import(\"../View.js\").default} view View.\n * @param {number} delta Delta from previous zoom level.\n * @param {import(\"../coordinate.js\").Coordinate=} opt_anchor Anchor coordinate.\n * @param {number=} opt_duration Duration.\n */\nexport function zoomByDelta(view, delta, opt_anchor, opt_duration) {\n  const currentResolution = view.getResolution();\n  let resolution = view.constrainResolution(currentResolution, delta, 0);\n\n  if (resolution !== undefined) {\n    const resolutions = view.getResolutions();\n    resolution = clamp(\n      resolution,\n      view.getMinResolution() || resolutions[resolutions.length - 1],\n      view.getMaxResolution() || resolutions[0]);\n  }\n\n  // If we have a constraint on center, we need to change the anchor so that the\n  // new center is within the extent. We first calculate the new center, apply\n  // the constraint to it, and then calculate back the anchor\n  if (opt_anchor && resolution !== undefined && resolution !== currentResolution) {\n    const currentCenter = view.getCenter();\n    let center = view.calculateCenterZoom(resolution, opt_anchor);\n    center = view.constrainCenter(center);\n\n    opt_anchor = [\n      (resolution * currentCenter[0] - currentResolution * center[0]) /\n          (resolution - currentResolution),\n      (resolution * currentCenter[1] - currentResolution * center[1]) /\n          (resolution - currentResolution)\n    ];\n  }\n\n  zoomWithoutConstraints(view, resolution, opt_anchor, opt_duration);\n}\n\n\n/**\n * @param {import(\"../View.js\").default} view View.\n * @param {number|undefined} resolution Resolution to go to.\n * @param {import(\"../coordinate.js\").Coordinate=} opt_anchor Anchor coordinate.\n * @param {number=} opt_duration Duration.\n */\nexport function zoomWithoutConstraints(view, resolution, opt_anchor, opt_duration) {\n  if (resolution) {\n    const currentResolution = view.getResolution();\n    const currentCenter = view.getCenter();\n    if (currentResolution !== undefined && currentCenter &&\n        resolution !== currentResolution && opt_duration) {\n      view.animate({\n        resolution: resolution,\n        anchor: opt_anchor,\n        duration: opt_duration,\n        easing: easeOut\n      });\n    } else {\n      if (opt_anchor) {\n        const center = view.calculateCenterZoom(resolution, opt_anchor);\n        view.setCenter(center);\n      }\n      view.setResolution(resolution);\n    }\n  }\n}\n\nexport default Interaction;\n","/**\n * @module ol/interaction/DoubleClickZoom\n */\nimport MapBrowserEventType from '../MapBrowserEventType.js';\nimport Interaction, {zoomByDelta} from './Interaction.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [duration=250] Animation duration in milliseconds.\n * @property {number} [delta=1] The zoom delta applied on each double click.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom by double-clicking on the map.\n * @api\n */\nclass DoubleClickZoom extends Interaction {\n\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n    super({\n      handleEvent: handleEvent\n    });\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.delta_ = options.delta ? options.delta : 1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n  }\n\n}\n\n\n/**\n * Handles the {@link module:ol/MapBrowserEvent map browser event} (if it was a\n * doubleclick) and eventually zooms the map.\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} `false` to stop event propagation.\n * @this {DoubleClickZoom}\n */\nfunction handleEvent(mapBrowserEvent) {\n  let stopEvent = false;\n  if (mapBrowserEvent.type == MapBrowserEventType.DBLCLICK) {\n    const browserEvent = /** @type {MouseEvent} */ (mapBrowserEvent.originalEvent);\n    const map = mapBrowserEvent.map;\n    const anchor = mapBrowserEvent.coordinate;\n    const delta = browserEvent.shiftKey ? -this.delta_ : this.delta_;\n    const view = map.getView();\n    zoomByDelta(view, delta, anchor, this.duration_);\n    mapBrowserEvent.preventDefault();\n    stopEvent = true;\n  }\n  return !stopEvent;\n}\n\nexport default DoubleClickZoom;\n","/**\n * @module ol/events/condition\n */\nimport MapBrowserEventType from '../MapBrowserEventType.js';\nimport {assert} from '../asserts.js';\nimport {TRUE, FALSE} from '../functions.js';\nimport {WEBKIT, MAC} from '../has.js';\n\n\n/**\n * A function that takes an {@link module:ol/MapBrowserEvent} and returns a\n * `{boolean}`. If the condition is met, true should be returned.\n *\n * @typedef {function(this: ?, import(\"../MapBrowserEvent.js\").default): boolean} Condition\n */\n\n\n/**\n * Return `true` if only the alt-key is pressed, `false` otherwise (e.g. when\n * additionally the shift-key is pressed).\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True if only the alt key is pressed.\n * @api\n */\nexport const altKeyOnly = function(mapBrowserEvent) {\n  const originalEvent = /** @type {KeyboardEvent|MouseEvent|TouchEvent} */ (mapBrowserEvent.originalEvent);\n  return (\n    originalEvent.altKey &&\n      !(originalEvent.metaKey || originalEvent.ctrlKey) &&\n      !originalEvent.shiftKey);\n};\n\n\n/**\n * Return `true` if only the alt-key and shift-key is pressed, `false` otherwise\n * (e.g. when additionally the platform-modifier-key is pressed).\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True if only the alt and shift keys are pressed.\n * @api\n */\nexport const altShiftKeysOnly = function(mapBrowserEvent) {\n  const originalEvent = /** @type {KeyboardEvent|MouseEvent|TouchEvent} */ (mapBrowserEvent.originalEvent);\n  return (\n    originalEvent.altKey &&\n      !(originalEvent.metaKey || originalEvent.ctrlKey) &&\n      originalEvent.shiftKey);\n};\n\n\n/**\n * Return `true` if the map has the focus. This condition requires a map target\n * element with a `tabindex` attribute, e.g. `<div id=\"map\" tabindex=\"1\">`.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} event Map browser event.\n * @return {boolean} The map has the focus.\n * @api\n */\nexport const focus = function(event) {\n  return event.target.getTargetElement() === document.activeElement;\n};\n\n\n/**\n * Return always true.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True.\n * @api\n */\nexport const always = TRUE;\n\n\n/**\n * Return `true` if the event is a `click` event, `false` otherwise.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True if the event is a map `click` event.\n * @api\n */\nexport const click = function(mapBrowserEvent) {\n  return mapBrowserEvent.type == MapBrowserEventType.CLICK;\n};\n\n\n/**\n * Return `true` if the event has an \"action\"-producing mouse button.\n *\n * By definition, this includes left-click on windows/linux, and left-click\n * without the ctrl key on Macs.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} The result.\n */\nexport const mouseActionButton = function(mapBrowserEvent) {\n  const originalEvent = /** @type {MouseEvent} */ (mapBrowserEvent.originalEvent);\n  return originalEvent.button == 0 &&\n      !(WEBKIT && MAC && originalEvent.ctrlKey);\n};\n\n\n/**\n * Return always false.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} False.\n * @api\n */\nexport const never = FALSE;\n\n\n/**\n * Return `true` if the browser event is a `pointermove` event, `false`\n * otherwise.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True if the browser event is a `pointermove` event.\n * @api\n */\nexport const pointerMove = function(mapBrowserEvent) {\n  return mapBrowserEvent.type == 'pointermove';\n};\n\n\n/**\n * Return `true` if the event is a map `singleclick` event, `false` otherwise.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True if the event is a map `singleclick` event.\n * @api\n */\nexport const singleClick = function(mapBrowserEvent) {\n  return mapBrowserEvent.type == MapBrowserEventType.SINGLECLICK;\n};\n\n\n/**\n * Return `true` if the event is a map `dblclick` event, `false` otherwise.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True if the event is a map `dblclick` event.\n * @api\n */\nexport const doubleClick = function(mapBrowserEvent) {\n  return mapBrowserEvent.type == MapBrowserEventType.DBLCLICK;\n};\n\n\n/**\n * Return `true` if no modifier key (alt-, shift- or platform-modifier-key) is\n * pressed.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True only if there no modifier keys are pressed.\n * @api\n */\nexport const noModifierKeys = function(mapBrowserEvent) {\n  const originalEvent = /** @type {KeyboardEvent|MouseEvent|TouchEvent} */ (mapBrowserEvent.originalEvent);\n  return (\n    !originalEvent.altKey &&\n      !(originalEvent.metaKey || originalEvent.ctrlKey) &&\n      !originalEvent.shiftKey);\n};\n\n\n/**\n * Return `true` if only the platform-modifier-key (the meta-key on Mac,\n * ctrl-key otherwise) is pressed, `false` otherwise (e.g. when additionally\n * the shift-key is pressed).\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True if only the platform modifier key is pressed.\n * @api\n */\nexport const platformModifierKeyOnly = function(mapBrowserEvent) {\n  const originalEvent = /** @type {KeyboardEvent|MouseEvent|TouchEvent} */ (mapBrowserEvent.originalEvent);\n  return !originalEvent.altKey &&\n    (MAC ? originalEvent.metaKey : originalEvent.ctrlKey) &&\n    !originalEvent.shiftKey;\n};\n\n\n/**\n * Return `true` if only the shift-key is pressed, `false` otherwise (e.g. when\n * additionally the alt-key is pressed).\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True if only the shift key is pressed.\n * @api\n */\nexport const shiftKeyOnly = function(mapBrowserEvent) {\n  const originalEvent = /** @type {KeyboardEvent|MouseEvent|TouchEvent} */ (mapBrowserEvent.originalEvent);\n  return (\n    !originalEvent.altKey &&\n      !(originalEvent.metaKey || originalEvent.ctrlKey) &&\n      originalEvent.shiftKey);\n};\n\n\n/**\n * Return `true` if the target element is not editable, i.e. not a `<input>`-,\n * `<select>`- or `<textarea>`-element, `false` otherwise.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True only if the target element is not editable.\n * @api\n */\nexport const targetNotEditable = function(mapBrowserEvent) {\n  const target = mapBrowserEvent.originalEvent.target;\n  const tagName = /** @type {Element} */ (target).tagName;\n  return (\n    tagName !== 'INPUT' &&\n      tagName !== 'SELECT' &&\n      tagName !== 'TEXTAREA');\n};\n\n\n/**\n * Return `true` if the event originates from a mouse device.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True if the event originates from a mouse device.\n * @api\n */\nexport const mouseOnly = function(mapBrowserEvent) {\n  const pointerEvent = /** @type {import(\"../MapBrowserPointerEvent\").default} */ (mapBrowserEvent).pointerEvent;\n  assert(pointerEvent !== undefined, 56); // mapBrowserEvent must originate from a pointer event\n  // see http://www.w3.org/TR/pointerevents/#widl-PointerEvent-pointerType\n  return pointerEvent.pointerType == 'mouse';\n};\n\n\n/**\n * Return `true` if the event originates from a primary pointer in\n * contact with the surface or if the left mouse button is pressed.\n * See http://www.w3.org/TR/pointerevents/#button-states.\n *\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} True if the event originates from a primary pointer.\n * @api\n */\nexport const primaryAction = function(mapBrowserEvent) {\n  const pointerEvent = /** @type {import(\"../MapBrowserPointerEvent\").default} */ (mapBrowserEvent).pointerEvent;\n  assert(pointerEvent !== undefined, 56); // mapBrowserEvent must originate from a pointer event\n  return pointerEvent.isPrimary && pointerEvent.button === 0;\n};\n","/**\n * @module ol/interaction/Pointer\n */\nimport MapBrowserEventType from '../MapBrowserEventType.js';\nimport Interaction from './Interaction.js';\nimport {getValues} from '../obj.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {function(import(\"../MapBrowserPointerEvent.js\").default):boolean} [handleDownEvent]\n * Function handling \"down\" events. If the function returns `true` then a drag\n * sequence is started.\n * @property {function(import(\"../MapBrowserPointerEvent.js\").default)} [handleDragEvent]\n * Function handling \"drag\" events. This function is called on \"move\" events\n * during a drag sequence.\n * @property {function(import(\"../MapBrowserEvent.js\").default):boolean} [handleEvent]\n * Method called by the map to notify the interaction that a browser event was\n * dispatched to the map. The function may return `false` to prevent the\n * propagation of the event to other interactions in the map's interactions\n * chain.\n * @property {function(import(\"../MapBrowserPointerEvent.js\").default)} [handleMoveEvent]\n * Function handling \"move\" events. This function is called on \"move\" events,\n * also during a drag sequence (so during a drag sequence both the\n * `handleDragEvent` function and this function are called).\n * @property {function(import(\"../MapBrowserPointerEvent.js\").default):boolean} [handleUpEvent]\n *  Function handling \"up\" events. If the function returns `false` then the\n * current drag sequence is stopped.\n * @property {function(boolean):boolean} [stopDown]\n * Should the down event be propagated to other interactions, or should be\n * stopped?\n */\n\n\n/**\n * @classdesc\n * Base class that calls user-defined functions on `down`, `move` and `up`\n * events. This class also manages \"drag sequences\".\n *\n * When the `handleDownEvent` user function returns `true` a drag sequence is\n * started. During a drag sequence the `handleDragEvent` user function is\n * called on `move` events. The drag sequence ends when the `handleUpEvent`\n * user function is called and returns `false`.\n * @api\n */\nclass PointerInteraction extends Interaction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super(/** @type {import(\"./Interaction.js\").InteractionOptions} */ (options));\n\n    if (options.handleDownEvent) {\n      this.handleDownEvent = options.handleDownEvent;\n    }\n\n    if (options.handleDragEvent) {\n      this.handleDragEvent = options.handleDragEvent;\n    }\n\n    if (options.handleMoveEvent) {\n      this.handleMoveEvent = options.handleMoveEvent;\n    }\n\n    if (options.handleUpEvent) {\n      this.handleUpEvent = options.handleUpEvent;\n    }\n\n    if (options.stopDown) {\n      this.stopDown = options.stopDown;\n    }\n\n    /**\n     * @type {boolean}\n     * @protected\n     */\n    this.handlingDownUpSequence = false;\n\n    /**\n     * @type {!Object<string, import(\"../pointer/PointerEvent.js\").default>}\n     * @private\n     */\n    this.trackedPointers_ = {};\n\n    /**\n     * @type {Array<import(\"../pointer/PointerEvent.js\").default>}\n     * @protected\n     */\n    this.targetPointers = [];\n\n  }\n\n  /**\n   * Handle pointer down events.\n   * @param {import(\"../MapBrowserPointerEvent.js\").default} mapBrowserEvent Event.\n   * @return {boolean} If the event was consumed.\n   * @protected\n   */\n  handleDownEvent(mapBrowserEvent) {\n    return false;\n  }\n\n  /**\n   * Handle pointer drag events.\n   * @param {import(\"../MapBrowserPointerEvent.js\").default} mapBrowserEvent Event.\n   * @protected\n   */\n  handleDragEvent(mapBrowserEvent) {}\n\n  /**\n   * Handles the {@link module:ol/MapBrowserEvent map browser event} and may call into\n   * other functions, if event sequences like e.g. 'drag' or 'down-up' etc. are\n   * detected.\n   * @override\n   * @api\n   */\n  handleEvent(mapBrowserEvent) {\n    if (!(/** @type {import(\"../MapBrowserPointerEvent.js\").default} */ (mapBrowserEvent).pointerEvent)) {\n      return true;\n    }\n\n    let stopEvent = false;\n    this.updateTrackedPointers_(mapBrowserEvent);\n    if (this.handlingDownUpSequence) {\n      if (mapBrowserEvent.type == MapBrowserEventType.POINTERDRAG) {\n        this.handleDragEvent(mapBrowserEvent);\n      } else if (mapBrowserEvent.type == MapBrowserEventType.POINTERUP) {\n        const handledUp = this.handleUpEvent(mapBrowserEvent);\n        this.handlingDownUpSequence = handledUp && this.targetPointers.length > 0;\n      }\n    } else {\n      if (mapBrowserEvent.type == MapBrowserEventType.POINTERDOWN) {\n        const handled = this.handleDownEvent(mapBrowserEvent);\n        if (handled) {\n          mapBrowserEvent.preventDefault();\n        }\n        this.handlingDownUpSequence = handled;\n        stopEvent = this.stopDown(handled);\n      } else if (mapBrowserEvent.type == MapBrowserEventType.POINTERMOVE) {\n        this.handleMoveEvent(mapBrowserEvent);\n      }\n    }\n    return !stopEvent;\n  }\n\n  /**\n   * Handle pointer move events.\n   * @param {import(\"../MapBrowserPointerEvent.js\").default} mapBrowserEvent Event.\n   * @protected\n   */\n  handleMoveEvent(mapBrowserEvent) {}\n\n  /**\n   * Handle pointer up events.\n   * @param {import(\"../MapBrowserPointerEvent.js\").default} mapBrowserEvent Event.\n   * @return {boolean} If the event was consumed.\n   * @protected\n   */\n  handleUpEvent(mapBrowserEvent) {\n    return false;\n  }\n\n  /**\n   * This function is used to determine if \"down\" events should be propagated\n   * to other interactions or should be stopped.\n   * @param {boolean} handled Was the event handled by the interaction?\n   * @return {boolean} Should the `down` event be stopped?\n   */\n  stopDown(handled) {\n    return handled;\n  }\n\n  /**\n   * @param {import(\"../MapBrowserPointerEvent.js\").default} mapBrowserEvent Event.\n   * @private\n   */\n  updateTrackedPointers_(mapBrowserEvent) {\n    if (isPointerDraggingEvent(mapBrowserEvent)) {\n      const event = mapBrowserEvent.pointerEvent;\n\n      const id = event.pointerId.toString();\n      if (mapBrowserEvent.type == MapBrowserEventType.POINTERUP) {\n        delete this.trackedPointers_[id];\n      } else if (mapBrowserEvent.type ==\n          MapBrowserEventType.POINTERDOWN) {\n        this.trackedPointers_[id] = event;\n      } else if (id in this.trackedPointers_) {\n        // update only when there was a pointerdown event for this pointer\n        this.trackedPointers_[id] = event;\n      }\n      this.targetPointers = getValues(this.trackedPointers_);\n    }\n  }\n\n}\n\n\n/**\n * @param {Array<import(\"../pointer/PointerEvent.js\").default>} pointerEvents List of events.\n * @return {import(\"../pixel.js\").Pixel} Centroid pixel.\n */\nexport function centroid(pointerEvents) {\n  const length = pointerEvents.length;\n  let clientX = 0;\n  let clientY = 0;\n  for (let i = 0; i < length; i++) {\n    clientX += pointerEvents[i].clientX;\n    clientY += pointerEvents[i].clientY;\n  }\n  return [clientX / length, clientY / length];\n}\n\n\n/**\n * @param {import(\"../MapBrowserPointerEvent.js\").default} mapBrowserEvent Event.\n * @return {boolean} Whether the event is a pointerdown, pointerdrag\n *     or pointerup event.\n */\nfunction isPointerDraggingEvent(mapBrowserEvent) {\n  const type = mapBrowserEvent.type;\n  return type === MapBrowserEventType.POINTERDOWN ||\n    type === MapBrowserEventType.POINTERDRAG ||\n    type === MapBrowserEventType.POINTERUP;\n}\n\n\nexport default PointerInteraction;\n","/**\n * @module ol/interaction/DragPan\n */\nimport ViewHint from '../ViewHint.js';\nimport {scale as scaleCoordinate, rotate as rotateCoordinate, add as addCoordinate} from '../coordinate.js';\nimport {easeOut} from '../easing.js';\nimport {noModifierKeys} from '../events/condition.js';\nimport {FALSE} from '../functions.js';\nimport PointerInteraction, {centroid as centroidFromPointers} from './Pointer.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a boolean\n * to indicate whether that event should be handled.\n * Default is {@link module:ol/events/condition~noModifierKeys}.\n * @property {import(\"../Kinetic.js\").default} [kinetic] Kinetic inertia to apply to the pan.\n */\n\n\n/**\n * @classdesc\n * Allows the user to pan the map by dragging the map.\n * @api\n */\nclass DragPan extends PointerInteraction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      stopDown: FALSE\n    });\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @private\n     * @type {import(\"../Kinetic.js\").default|undefined}\n     */\n    this.kinetic_ = options.kinetic;\n\n    /**\n     * @type {import(\"../pixel.js\").Pixel}\n     */\n    this.lastCentroid = null;\n\n    /**\n     * @type {number}\n     */\n    this.lastPointersCount_;\n\n    /**\n     * @type {boolean}\n     */\n    this.panning_ = false;\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.condition_ = options.condition ? options.condition : noModifierKeys;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.noKinetic_ = false;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDragEvent(mapBrowserEvent) {\n    if (!this.panning_) {\n      this.panning_ = true;\n      this.getMap().getView().setHint(ViewHint.INTERACTING, 1);\n    }\n    const targetPointers = this.targetPointers;\n    const centroid = centroidFromPointers(targetPointers);\n    if (targetPointers.length == this.lastPointersCount_) {\n      if (this.kinetic_) {\n        this.kinetic_.update(centroid[0], centroid[1]);\n      }\n      if (this.lastCentroid) {\n        const deltaX = this.lastCentroid[0] - centroid[0];\n        const deltaY = centroid[1] - this.lastCentroid[1];\n        const map = mapBrowserEvent.map;\n        const view = map.getView();\n        let center = [deltaX, deltaY];\n        scaleCoordinate(center, view.getResolution());\n        rotateCoordinate(center, view.getRotation());\n        addCoordinate(center, view.getCenter());\n        center = view.constrainCenter(center);\n        view.setCenter(center);\n      }\n    } else if (this.kinetic_) {\n      // reset so we don't overestimate the kinetic energy after\n      // after one finger down, tiny drag, second finger down\n      this.kinetic_.begin();\n    }\n    this.lastCentroid = centroid;\n    this.lastPointersCount_ = targetPointers.length;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(mapBrowserEvent) {\n    const map = mapBrowserEvent.map;\n    const view = map.getView();\n    if (this.targetPointers.length === 0) {\n      if (!this.noKinetic_ && this.kinetic_ && this.kinetic_.end()) {\n        const distance = this.kinetic_.getDistance();\n        const angle = this.kinetic_.getAngle();\n        const center = /** @type {!import(\"../coordinate.js\").Coordinate} */ (view.getCenter());\n        const centerpx = map.getPixelFromCoordinate(center);\n        const dest = map.getCoordinateFromPixel([\n          centerpx[0] - distance * Math.cos(angle),\n          centerpx[1] - distance * Math.sin(angle)\n        ]);\n        view.animate({\n          center: view.constrainCenter(dest),\n          duration: 500,\n          easing: easeOut\n        });\n      }\n      if (this.panning_) {\n        this.panning_ = false;\n        view.setHint(ViewHint.INTERACTING, -1);\n      }\n      return false;\n    } else {\n      if (this.kinetic_) {\n        // reset so we don't overestimate the kinetic energy after\n        // after one finger up, tiny drag, second finger up\n        this.kinetic_.begin();\n      }\n      this.lastCentroid = null;\n      return true;\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDownEvent(mapBrowserEvent) {\n    if (this.targetPointers.length > 0 && this.condition_(mapBrowserEvent)) {\n      const map = mapBrowserEvent.map;\n      const view = map.getView();\n      this.lastCentroid = null;\n      // stop any current animation\n      if (view.getAnimating()) {\n        view.setCenter(mapBrowserEvent.frameState.viewState.center);\n      }\n      if (this.kinetic_) {\n        this.kinetic_.begin();\n      }\n      // No kinetic as soon as more than one pointer on the screen is\n      // detected. This is to prevent nasty pans after pinch.\n      this.noKinetic_ = this.targetPointers.length > 1;\n      return true;\n    } else {\n      return false;\n    }\n  }\n}\n\nexport default DragPan;\n","/**\n * @module ol/interaction/DragRotate\n */\nimport {disable} from '../rotationconstraint.js';\nimport ViewHint from '../ViewHint.js';\nimport {altShiftKeysOnly, mouseOnly, mouseActionButton} from '../events/condition.js';\nimport {FALSE} from '../functions.js';\nimport {rotate, rotateWithoutConstraints} from './Interaction.js';\nimport PointerInteraction from './Pointer.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that takes an\n * {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a boolean\n * to indicate whether that event should be handled.\n * Default is {@link module:ol/events/condition~altShiftKeysOnly}.\n * @property {number} [duration=250] Animation duration in milliseconds.\n */\n\n\n/**\n * @classdesc\n * Allows the user to rotate the map by clicking and dragging on the map,\n * normally combined with an {@link module:ol/events/condition} that limits\n * it to when the alt and shift keys are held down.\n *\n * This interaction is only supported for mouse devices.\n * @api\n */\nclass DragRotate extends PointerInteraction {\n\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super({\n      stopDown: FALSE\n    });\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.condition_ = options.condition ? options.condition : altShiftKeysOnly;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.lastAngle_ = undefined;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDragEvent(mapBrowserEvent) {\n    if (!mouseOnly(mapBrowserEvent)) {\n      return;\n    }\n\n    const map = mapBrowserEvent.map;\n    const view = map.getView();\n    if (view.getConstraints().rotation === disable) {\n      return;\n    }\n    const size = map.getSize();\n    const offset = mapBrowserEvent.pixel;\n    const theta =\n        Math.atan2(size[1] / 2 - offset[1], offset[0] - size[0] / 2);\n    if (this.lastAngle_ !== undefined) {\n      const delta = theta - this.lastAngle_;\n      const rotation = view.getRotation();\n      rotateWithoutConstraints(view, rotation - delta);\n    }\n    this.lastAngle_ = theta;\n  }\n\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(mapBrowserEvent) {\n    if (!mouseOnly(mapBrowserEvent)) {\n      return true;\n    }\n\n    const map = mapBrowserEvent.map;\n    const view = map.getView();\n    view.setHint(ViewHint.INTERACTING, -1);\n    const rotation = view.getRotation();\n    rotate(view, rotation, undefined, this.duration_);\n    return false;\n  }\n\n\n  /**\n   * @inheritDoc\n   */\n  handleDownEvent(mapBrowserEvent) {\n    if (!mouseOnly(mapBrowserEvent)) {\n      return false;\n    }\n\n    if (mouseActionButton(mapBrowserEvent) && this.condition_(mapBrowserEvent)) {\n      const map = mapBrowserEvent.map;\n      map.getView().setHint(ViewHint.INTERACTING, 1);\n      this.lastAngle_ = undefined;\n      return true;\n    } else {\n      return false;\n    }\n  }\n}\n\nexport default DragRotate;\n","/**\n * @module ol/render/Box\n */\n\nimport Disposable from '../Disposable.js';\nimport Polygon from '../geom/Polygon.js';\n\nclass RenderBox extends Disposable {\n  /**\n   * @param {string} className CSS class name.\n   */\n  constructor(className) {\n    super();\n\n    /**\n     * @type {import(\"../geom/Polygon.js\").default}\n     * @private\n     */\n    this.geometry_ = null;\n\n    /**\n     * @type {HTMLDivElement}\n     * @private\n     */\n    this.element_ = /** @type {HTMLDivElement} */ (document.createElement('div'));\n    this.element_.style.position = 'absolute';\n    this.element_.className = 'ol-box ' + className;\n\n    /**\n     * @private\n     * @type {import(\"../PluggableMap.js\").default}\n     */\n    this.map_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../pixel.js\").Pixel}\n     */\n    this.startPixel_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../pixel.js\").Pixel}\n     */\n    this.endPixel_ = null;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    this.setMap(null);\n  }\n\n  /**\n   * @private\n   */\n  render_() {\n    const startPixel = this.startPixel_;\n    const endPixel = this.endPixel_;\n    const px = 'px';\n    const style = this.element_.style;\n    style.left = Math.min(startPixel[0], endPixel[0]) + px;\n    style.top = Math.min(startPixel[1], endPixel[1]) + px;\n    style.width = Math.abs(endPixel[0] - startPixel[0]) + px;\n    style.height = Math.abs(endPixel[1] - startPixel[1]) + px;\n  }\n\n  /**\n   * @param {import(\"../PluggableMap.js\").default} map Map.\n   */\n  setMap(map) {\n    if (this.map_) {\n      this.map_.getOverlayContainer().removeChild(this.element_);\n      const style = this.element_.style;\n      style.left = style.top = style.width = style.height = 'inherit';\n    }\n    this.map_ = map;\n    if (this.map_) {\n      this.map_.getOverlayContainer().appendChild(this.element_);\n    }\n  }\n\n  /**\n   * @param {import(\"../pixel.js\").Pixel} startPixel Start pixel.\n   * @param {import(\"../pixel.js\").Pixel} endPixel End pixel.\n   */\n  setPixels(startPixel, endPixel) {\n    this.startPixel_ = startPixel;\n    this.endPixel_ = endPixel;\n    this.createOrUpdateGeometry();\n    this.render_();\n  }\n\n  /**\n   * Creates or updates the cached geometry.\n   */\n  createOrUpdateGeometry() {\n    const startPixel = this.startPixel_;\n    const endPixel = this.endPixel_;\n    const pixels = [\n      startPixel,\n      [startPixel[0], endPixel[1]],\n      endPixel,\n      [endPixel[0], startPixel[1]]\n    ];\n    const coordinates = pixels.map(this.map_.getCoordinateFromPixel, this.map_);\n    // close the polygon\n    coordinates[4] = coordinates[0].slice();\n    if (!this.geometry_) {\n      this.geometry_ = new Polygon([coordinates]);\n    } else {\n      this.geometry_.setCoordinates([coordinates]);\n    }\n  }\n\n  /**\n   * @return {import(\"../geom/Polygon.js\").default} Geometry.\n   */\n  getGeometry() {\n    return this.geometry_;\n  }\n}\n\n\nexport default RenderBox;\n","/**\n * @module ol/interaction/DragBox\n */\n// FIXME draw drag box\nimport Event from '../events/Event.js';\nimport {always, mouseOnly, mouseActionButton} from '../events/condition.js';\nimport {VOID} from '../functions.js';\nimport PointerInteraction from './Pointer.js';\nimport RenderBox from '../render/Box.js';\n\n\n/**\n * A function that takes a {@link module:ol/MapBrowserEvent} and two\n * {@link module:ol/pixel~Pixel}s and returns a `{boolean}`. If the condition is met,\n * true should be returned.\n * @typedef {function(this: ?, import(\"../MapBrowserEvent.js\").default, import(\"../pixel.js\").Pixel, import(\"../pixel.js\").Pixel):boolean} EndCondition\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {string} [className='ol-dragbox'] CSS class name for styling the box.\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a boolean\n * to indicate whether that event should be handled.\n * Default is {@link ol/events/condition~always}.\n * @property {number} [minArea=64] The minimum area of the box in pixel, this value is used by the default\n * `boxEndCondition` function.\n * @property {EndCondition} [boxEndCondition] A function that takes a {@link module:ol/MapBrowserEvent~MapBrowserEvent} and two\n * {@link module:ol/pixel~Pixel}s to indicate whether a `boxend` event should be fired.\n * Default is `true` if the area of the box is bigger than the `minArea` option.\n * @property {function(this:DragBox, import(\"../MapBrowserEvent.js\").default)} onBoxEnd Code to execute just\n * before `boxend` is fired.\n */\n\n\n/**\n * @enum {string}\n */\nconst DragBoxEventType = {\n  /**\n   * Triggered upon drag box start.\n   * @event DragBoxEvent#boxstart\n   * @api\n   */\n  BOXSTART: 'boxstart',\n\n  /**\n   * Triggered on drag when box is active.\n   * @event DragBoxEvent#boxdrag\n   * @api\n   */\n  BOXDRAG: 'boxdrag',\n\n  /**\n   * Triggered upon drag box end.\n   * @event DragBoxEvent#boxend\n   * @api\n   */\n  BOXEND: 'boxend'\n};\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/interaction/DragBox~DragBox} instances are instances of\n * this type.\n */\nclass DragBoxEvent extends Event {\n\n  /**\n   * @param {string} type The event type.\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate The event coordinate.\n   * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Originating event.\n   */\n  constructor(type, coordinate, mapBrowserEvent) {\n    super(type);\n\n    /**\n     * The coordinate of the drag event.\n     * @const\n     * @type {import(\"../coordinate.js\").Coordinate}\n     * @api\n     */\n    this.coordinate = coordinate;\n\n    /**\n     * @const\n     * @type {import(\"../MapBrowserEvent.js\").default}\n     * @api\n     */\n    this.mapBrowserEvent = mapBrowserEvent;\n\n  }\n\n}\n\n\n/**\n * @classdesc\n * Allows the user to draw a vector box by clicking and dragging on the map,\n * normally combined with an {@link module:ol/events/condition} that limits\n * it to when the shift or other key is held down. This is used, for example,\n * for zooming to a specific area of the map\n * (see {@link module:ol/interaction/DragZoom~DragZoom} and\n * {@link module:ol/interaction/DragRotateAndZoom}).\n *\n * This interaction is only supported for mouse devices.\n *\n * @fires DragBoxEvent\n * @api\n */\nclass DragBox extends PointerInteraction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super();\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n    * @type {import(\"../render/Box.js\").default}\n    * @private\n    */\n    this.box_ = new RenderBox(options.className || 'ol-dragbox');\n\n    /**\n    * @type {number}\n    * @private\n    */\n    this.minArea_ = options.minArea !== undefined ? options.minArea : 64;\n\n    /**\n     * Function to execute just before `onboxend` is fired\n     * @type {function(this:DragBox, import(\"../MapBrowserEvent.js\").default)}\n     * @private\n     */\n    this.onBoxEnd_ = options.onBoxEnd ? options.onBoxEnd : VOID;\n\n    /**\n    * @type {import(\"../pixel.js\").Pixel}\n    * @private\n    */\n    this.startPixel_ = null;\n\n    /**\n    * @private\n    * @type {import(\"../events/condition.js\").Condition}\n    */\n    this.condition_ = options.condition ? options.condition : always;\n\n    /**\n    * @private\n    * @type {EndCondition}\n    */\n    this.boxEndCondition_ = options.boxEndCondition ?\n      options.boxEndCondition : this.defaultBoxEndCondition;\n  }\n\n  /**\n   * The default condition for determining whether the boxend event\n   * should fire.\n   * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent The originating MapBrowserEvent\n   *     leading to the box end.\n   * @param {import(\"../pixel.js\").Pixel} startPixel The starting pixel of the box.\n   * @param {import(\"../pixel.js\").Pixel} endPixel The end pixel of the box.\n   * @return {boolean} Whether or not the boxend condition should be fired.\n   */\n  defaultBoxEndCondition(mapBrowserEvent, startPixel, endPixel) {\n    const width = endPixel[0] - startPixel[0];\n    const height = endPixel[1] - startPixel[1];\n    return width * width + height * height >= this.minArea_;\n  }\n\n  /**\n  * Returns geometry of last drawn box.\n  * @return {import(\"../geom/Polygon.js\").default} Geometry.\n  * @api\n  */\n  getGeometry() {\n    return this.box_.getGeometry();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDragEvent(mapBrowserEvent) {\n    if (!mouseOnly(mapBrowserEvent)) {\n      return;\n    }\n\n    this.box_.setPixels(this.startPixel_, mapBrowserEvent.pixel);\n\n    this.dispatchEvent(new DragBoxEvent(DragBoxEventType.BOXDRAG,\n      mapBrowserEvent.coordinate, mapBrowserEvent));\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(mapBrowserEvent) {\n    if (!mouseOnly(mapBrowserEvent)) {\n      return true;\n    }\n\n    this.box_.setMap(null);\n\n    if (this.boxEndCondition_(mapBrowserEvent, this.startPixel_, mapBrowserEvent.pixel)) {\n      this.onBoxEnd_(mapBrowserEvent);\n      this.dispatchEvent(new DragBoxEvent(DragBoxEventType.BOXEND,\n        mapBrowserEvent.coordinate, mapBrowserEvent));\n    }\n    return false;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDownEvent(mapBrowserEvent) {\n    if (!mouseOnly(mapBrowserEvent)) {\n      return false;\n    }\n\n    if (mouseActionButton(mapBrowserEvent) &&\n        this.condition_(mapBrowserEvent)) {\n      this.startPixel_ = mapBrowserEvent.pixel;\n      this.box_.setMap(mapBrowserEvent.map);\n      this.box_.setPixels(this.startPixel_, this.startPixel_);\n      this.dispatchEvent(new DragBoxEvent(DragBoxEventType.BOXSTART,\n        mapBrowserEvent.coordinate, mapBrowserEvent));\n      return true;\n    } else {\n      return false;\n    }\n  }\n}\n\n\nexport default DragBox;\n","/**\n * @module ol/interaction/DragZoom\n */\nimport {easeOut} from '../easing.js';\nimport {shiftKeyOnly} from '../events/condition.js';\nimport {createOrUpdateFromCoordinates, getBottomLeft, getCenter, getTopRight, scaleFromCenter} from '../extent.js';\nimport DragBox from './DragBox.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {string} [className='ol-dragzoom'] CSS class name for styling the\n * box.\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled.\n * Default is {@link module:ol/events/condition~shiftKeyOnly}.\n * @property {number} [duration=200] Animation duration in milliseconds.\n * @property {boolean} [out=false] Use interaction for zooming out.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom the map by clicking and dragging on the map,\n * normally combined with an {@link module:ol/events/condition} that limits\n * it to when a key, shift by default, is held down.\n *\n * To change the style of the box, use CSS and the `.ol-dragzoom` selector, or\n * your custom one configured with `className`.\n * @api\n */\nclass DragZoom extends DragBox {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n    const options = opt_options ? opt_options : {};\n\n    const condition = options.condition ? options.condition : shiftKeyOnly;\n\n    super({\n      condition: condition,\n      className: options.className || 'ol-dragzoom',\n      onBoxEnd: onBoxEnd\n    });\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 200;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.out_ = options.out !== undefined ? options.out : false;\n  }\n}\n\n\n/**\n * @this {DragZoom}\n */\nfunction onBoxEnd() {\n  const map = this.getMap();\n  const view = /** @type {!import(\"../View.js\").default} */ (map.getView());\n  const size = /** @type {!import(\"../size.js\").Size} */ (map.getSize());\n  let extent = this.getGeometry().getExtent();\n\n  if (this.out_) {\n    const mapExtent = view.calculateExtent(size);\n    const boxPixelExtent = createOrUpdateFromCoordinates([\n      map.getPixelFromCoordinate(getBottomLeft(extent)),\n      map.getPixelFromCoordinate(getTopRight(extent))]);\n    const factor = view.getResolutionForExtent(boxPixelExtent, size);\n\n    scaleFromCenter(mapExtent, 1 / factor);\n    extent = mapExtent;\n  }\n\n  const resolution = view.constrainResolution(\n    view.getResolutionForExtent(extent, size));\n\n  let center = getCenter(extent);\n  center = view.constrainCenter(center);\n\n  view.animate({\n    resolution: resolution,\n    center: center,\n    duration: this.duration_,\n    easing: easeOut\n  });\n}\n\n\nexport default DragZoom;\n","/**\n * @module ol/events/KeyCode\n */\n\n/**\n * @enum {number}\n * @const\n */\nexport default {\n  LEFT: 37,\n  UP: 38,\n  RIGHT: 39,\n  DOWN: 40\n};\n","/**\n * @module ol/interaction/KeyboardPan\n */\nimport {rotate as rotateCoordinate} from '../coordinate.js';\nimport EventType from '../events/EventType.js';\nimport KeyCode from '../events/KeyCode.js';\nimport {noModifierKeys, targetNotEditable} from '../events/condition.js';\nimport Interaction, {pan} from './Interaction.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled. Default is\n * {@link module:ol/events/condition~noModifierKeys} and\n * {@link module:ol/events/condition~targetNotEditable}.\n * @property {number} [duration=100] Animation duration in milliseconds.\n * @property {number} [pixelDelta=128] The amount of pixels to pan on each key\n * press.\n */\n\n\n/**\n * @classdesc\n * Allows the user to pan the map using keyboard arrows.\n * Note that, although this interaction is by default included in maps,\n * the keys can only be used when browser focus is on the element to which\n * the keyboard events are attached. By default, this is the map div,\n * though you can change this with the `keyboardEventTarget` in\n * {@link module:ol/Map~Map}. `document` never loses focus but, for any other\n * element, focus will have to be on, and returned to, this element if the keys\n * are to function.\n * See also {@link module:ol/interaction/KeyboardZoom~KeyboardZoom}.\n * @api\n */\nclass KeyboardPan extends Interaction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      handleEvent: handleEvent\n    });\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Browser event.\n     * @return {boolean} Combined condition result.\n     */\n    this.defaultCondition_ = function(mapBrowserEvent) {\n      return noModifierKeys(mapBrowserEvent) &&\n        targetNotEditable(mapBrowserEvent);\n    };\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.condition_ = options.condition !== undefined ?\n      options.condition : this.defaultCondition_;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 100;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelDelta_ = options.pixelDelta !== undefined ?\n      options.pixelDelta : 128;\n\n  }\n\n}\n\n\n/**\n * Handles the {@link module:ol/MapBrowserEvent map browser event} if it was a\n * `KeyEvent`, and decides the direction to pan to (if an arrow key was\n * pressed).\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} `false` to stop event propagation.\n * @this {KeyboardPan}\n */\nfunction handleEvent(mapBrowserEvent) {\n  let stopEvent = false;\n  if (mapBrowserEvent.type == EventType.KEYDOWN) {\n    const keyEvent = /** @type {KeyboardEvent} */ (mapBrowserEvent.originalEvent);\n    const keyCode = keyEvent.keyCode;\n    if (this.condition_(mapBrowserEvent) &&\n        (keyCode == KeyCode.DOWN ||\n        keyCode == KeyCode.LEFT ||\n        keyCode == KeyCode.RIGHT ||\n        keyCode == KeyCode.UP)) {\n      const map = mapBrowserEvent.map;\n      const view = map.getView();\n      const mapUnitsDelta = view.getResolution() * this.pixelDelta_;\n      let deltaX = 0, deltaY = 0;\n      if (keyCode == KeyCode.DOWN) {\n        deltaY = -mapUnitsDelta;\n      } else if (keyCode == KeyCode.LEFT) {\n        deltaX = -mapUnitsDelta;\n      } else if (keyCode == KeyCode.RIGHT) {\n        deltaX = mapUnitsDelta;\n      } else {\n        deltaY = mapUnitsDelta;\n      }\n      const delta = [deltaX, deltaY];\n      rotateCoordinate(delta, view.getRotation());\n      pan(view, delta, this.duration_);\n      mapBrowserEvent.preventDefault();\n      stopEvent = true;\n    }\n  }\n  return !stopEvent;\n}\n\nexport default KeyboardPan;\n","/**\n * @module ol/interaction/KeyboardZoom\n */\nimport EventType from '../events/EventType.js';\nimport {targetNotEditable} from '../events/condition.js';\nimport Interaction, {zoomByDelta} from './Interaction.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [duration=100] Animation duration in milliseconds.\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled. Default is\n * {@link module:ol/events/condition~targetNotEditable}.\n * @property {number} [delta=1] The zoom level delta on each key press.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom the map using keyboard + and -.\n * Note that, although this interaction is by default included in maps,\n * the keys can only be used when browser focus is on the element to which\n * the keyboard events are attached. By default, this is the map div,\n * though you can change this with the `keyboardEventTarget` in\n * {@link module:ol/Map~Map}. `document` never loses focus but, for any other\n * element, focus will have to be on, and returned to, this element if the keys\n * are to function.\n * See also {@link module:ol/interaction/KeyboardPan~KeyboardPan}.\n * @api\n */\nclass KeyboardZoom extends Interaction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      handleEvent: handleEvent\n    });\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.condition_ = options.condition ? options.condition : targetNotEditable;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.delta_ = options.delta ? options.delta : 1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 100;\n\n  }\n\n}\n\n\n/**\n * Handles the {@link module:ol/MapBrowserEvent map browser event} if it was a\n * `KeyEvent`, and decides whether to zoom in or out (depending on whether the\n * key pressed was '+' or '-').\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} `false` to stop event propagation.\n * @this {KeyboardZoom}\n */\nfunction handleEvent(mapBrowserEvent) {\n  let stopEvent = false;\n  if (mapBrowserEvent.type == EventType.KEYDOWN ||\n      mapBrowserEvent.type == EventType.KEYPRESS) {\n    const keyEvent = /** @type {KeyboardEvent} */ (mapBrowserEvent.originalEvent);\n    const charCode = keyEvent.charCode;\n    if (this.condition_(mapBrowserEvent) &&\n        (charCode == '+'.charCodeAt(0) || charCode == '-'.charCodeAt(0))) {\n      const map = mapBrowserEvent.map;\n      const delta = (charCode == '+'.charCodeAt(0)) ? this.delta_ : -this.delta_;\n      const view = map.getView();\n      zoomByDelta(view, delta, undefined, this.duration_);\n      mapBrowserEvent.preventDefault();\n      stopEvent = true;\n    }\n  }\n  return !stopEvent;\n}\n\nexport default KeyboardZoom;\n","/**\n * @module ol/interaction/MouseWheelZoom\n */\nimport ViewHint from '../ViewHint.js';\nimport {always} from '../events/condition.js';\nimport {easeOut} from '../easing.js';\nimport EventType from '../events/EventType.js';\nimport {DEVICE_PIXEL_RATIO, FIREFOX, SAFARI} from '../has.js';\nimport Interaction, {zoomByDelta} from './Interaction.js';\nimport {clamp} from '../math.js';\n\n\n/**\n * Maximum mouse wheel delta.\n * @type {number}\n */\nconst MAX_DELTA = 1;\n\n\n/**\n * @enum {string}\n */\nexport const Mode = {\n  TRACKPAD: 'trackpad',\n  WHEEL: 'wheel'\n};\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled. Default is\n * {@link module:ol/events/condition~always}.\n * @property {number} [duration=250] Animation duration in milliseconds.\n * @property {number} [timeout=80] Mouse wheel timeout duration in milliseconds.\n * @property {boolean} [constrainResolution=false] When using a trackpad or\n * magic mouse, zoom to the closest integer zoom level after the scroll gesture\n * ends.\n * @property {boolean} [useAnchor=true] Enable zooming using the mouse's\n * location as the anchor. When set to `false`, zooming in and out will zoom to\n * the center of the screen instead of zooming on the mouse's location.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom the map by scrolling the mouse wheel.\n * @api\n */\nclass MouseWheelZoom extends Interaction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super(/** @type {import(\"./Interaction.js\").InteractionOptions} */ (options));\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.delta_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.timeout_ = options.timeout !== undefined ? options.timeout : 80;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.useAnchor_ = options.useAnchor !== undefined ? options.useAnchor : true;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.constrainResolution_ = options.constrainResolution || false;\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.condition_ = options.condition ? options.condition : always;\n\n    /**\n     * @private\n     * @type {?import(\"../coordinate.js\").Coordinate}\n     */\n    this.lastAnchor_ = null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.startTime_ = undefined;\n\n    /**\n     * @private\n     * @type {?}\n     */\n    this.timeoutId_;\n\n    /**\n     * @private\n     * @type {Mode|undefined}\n     */\n    this.mode_ = undefined;\n\n    /**\n     * Trackpad events separated by this delay will be considered separate\n     * interactions.\n     * @type {number}\n     */\n    this.trackpadEventGap_ = 400;\n\n    /**\n     * @type {?}\n     */\n    this.trackpadTimeoutId_;\n\n    /**\n     * The number of delta values per zoom level\n     * @private\n     * @type {number}\n     */\n    this.trackpadDeltaPerZoom_ = 300;\n\n    /**\n     * The zoom factor by which scroll zooming is allowed to exceed the limits.\n     * @private\n     * @type {number}\n     */\n    this.trackpadZoomBuffer_ = 1.5;\n\n  }\n\n  /**\n   * @private\n   */\n  decrementInteractingHint_() {\n    this.trackpadTimeoutId_ = undefined;\n    const view = this.getMap().getView();\n    view.setHint(ViewHint.INTERACTING, -1);\n  }\n\n  /**\n   * Handles the {@link module:ol/MapBrowserEvent map browser event} (if it was a mousewheel-event) and eventually\n   * zooms the map.\n   * @override\n   */\n  handleEvent(mapBrowserEvent) {\n    if (!this.condition_(mapBrowserEvent)) {\n      return true;\n    }\n    const type = mapBrowserEvent.type;\n    if (type !== EventType.WHEEL && type !== EventType.MOUSEWHEEL) {\n      return true;\n    }\n\n    mapBrowserEvent.preventDefault();\n\n    const map = mapBrowserEvent.map;\n    const wheelEvent = /** @type {WheelEvent} */ (mapBrowserEvent.originalEvent);\n\n    if (this.useAnchor_) {\n      this.lastAnchor_ = mapBrowserEvent.coordinate;\n    }\n\n    // Delta normalisation inspired by\n    // https://github.com/mapbox/mapbox-gl-js/blob/001c7b9/js/ui/handler/scroll_zoom.js\n    let delta;\n    if (mapBrowserEvent.type == EventType.WHEEL) {\n      delta = wheelEvent.deltaY;\n      if (FIREFOX &&\n          wheelEvent.deltaMode === WheelEvent.DOM_DELTA_PIXEL) {\n        delta /= DEVICE_PIXEL_RATIO;\n      }\n      if (wheelEvent.deltaMode === WheelEvent.DOM_DELTA_LINE) {\n        delta *= 40;\n      }\n    } else if (mapBrowserEvent.type == EventType.MOUSEWHEEL) {\n      delta = -wheelEvent.wheelDeltaY;\n      if (SAFARI) {\n        delta /= 3;\n      }\n    }\n\n    if (delta === 0) {\n      return false;\n    }\n\n    const now = Date.now();\n\n    if (this.startTime_ === undefined) {\n      this.startTime_ = now;\n    }\n\n    if (!this.mode_ || now - this.startTime_ > this.trackpadEventGap_) {\n      this.mode_ = Math.abs(delta) < 4 ?\n        Mode.TRACKPAD :\n        Mode.WHEEL;\n    }\n\n    if (this.mode_ === Mode.TRACKPAD) {\n      const view = map.getView();\n      if (this.trackpadTimeoutId_) {\n        clearTimeout(this.trackpadTimeoutId_);\n      } else {\n        view.setHint(ViewHint.INTERACTING, 1);\n      }\n      this.trackpadTimeoutId_ = setTimeout(this.decrementInteractingHint_.bind(this), this.trackpadEventGap_);\n      let resolution = view.getResolution() * Math.pow(2, delta / this.trackpadDeltaPerZoom_);\n      const minResolution = view.getMinResolution();\n      const maxResolution = view.getMaxResolution();\n      let rebound = 0;\n      if (resolution < minResolution) {\n        resolution = Math.max(resolution, minResolution / this.trackpadZoomBuffer_);\n        rebound = 1;\n      } else if (resolution > maxResolution) {\n        resolution = Math.min(resolution, maxResolution * this.trackpadZoomBuffer_);\n        rebound = -1;\n      }\n      if (this.lastAnchor_) {\n        const center = view.calculateCenterZoom(resolution, this.lastAnchor_);\n        view.setCenter(view.constrainCenter(center));\n      }\n      view.setResolution(resolution);\n\n      if (rebound === 0 && this.constrainResolution_) {\n        view.animate({\n          resolution: view.constrainResolution(resolution, delta > 0 ? -1 : 1),\n          easing: easeOut,\n          anchor: this.lastAnchor_,\n          duration: this.duration_\n        });\n      }\n\n      if (rebound > 0) {\n        view.animate({\n          resolution: minResolution,\n          easing: easeOut,\n          anchor: this.lastAnchor_,\n          duration: 500\n        });\n      } else if (rebound < 0) {\n        view.animate({\n          resolution: maxResolution,\n          easing: easeOut,\n          anchor: this.lastAnchor_,\n          duration: 500\n        });\n      }\n      this.startTime_ = now;\n      return false;\n    }\n\n    this.delta_ += delta;\n\n    const timeLeft = Math.max(this.timeout_ - (now - this.startTime_), 0);\n\n    clearTimeout(this.timeoutId_);\n    this.timeoutId_ = setTimeout(this.handleWheelZoom_.bind(this, map), timeLeft);\n\n    return false;\n  }\n\n  /**\n   * @private\n   * @param {import(\"../PluggableMap.js\").default} map Map.\n   */\n  handleWheelZoom_(map) {\n    const view = map.getView();\n    if (view.getAnimating()) {\n      view.cancelAnimations();\n    }\n    const maxDelta = MAX_DELTA;\n    const delta = clamp(this.delta_, -maxDelta, maxDelta);\n    zoomByDelta(view, -delta, this.lastAnchor_, this.duration_);\n    this.mode_ = undefined;\n    this.delta_ = 0;\n    this.lastAnchor_ = null;\n    this.startTime_ = undefined;\n    this.timeoutId_ = undefined;\n  }\n\n  /**\n   * Enable or disable using the mouse's location as an anchor when zooming\n   * @param {boolean} useAnchor true to zoom to the mouse's location, false\n   * to zoom to the center of the map\n   * @api\n   */\n  setMouseAnchor(useAnchor) {\n    this.useAnchor_ = useAnchor;\n    if (!useAnchor) {\n      this.lastAnchor_ = null;\n    }\n  }\n}\n\nexport default MouseWheelZoom;\n","/**\n * @module ol/interaction/PinchRotate\n */\nimport ViewHint from '../ViewHint.js';\nimport {FALSE} from '../functions.js';\nimport {rotate, rotateWithoutConstraints} from './Interaction.js';\nimport PointerInteraction, {centroid as centroidFromPointers} from './Pointer.js';\nimport {disable} from '../rotationconstraint.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [duration=250] The duration of the animation in\n * milliseconds.\n * @property {number} [threshold=0.3] Minimal angle in radians to start a rotation.\n */\n\n\n/**\n * @classdesc\n * Allows the user to rotate the map by twisting with two fingers\n * on a touch screen.\n * @api\n */\nclass PinchRotate extends PointerInteraction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    const pointerOptions = /** @type {import(\"./Pointer.js\").Options} */ (options);\n\n    if (!pointerOptions.stopDown) {\n      pointerOptions.stopDown = FALSE;\n    }\n\n    super(pointerOptions);\n\n    /**\n     * @private\n     * @type {import(\"../coordinate.js\").Coordinate}\n     */\n    this.anchor_ = null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.lastAngle_ = undefined;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.rotating_ = false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.rotationDelta_ = 0.0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.threshold_ = options.threshold !== undefined ? options.threshold : 0.3;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 250;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDragEvent(mapBrowserEvent) {\n    let rotationDelta = 0.0;\n\n    const touch0 = this.targetPointers[0];\n    const touch1 = this.targetPointers[1];\n\n    // angle between touches\n    const angle = Math.atan2(\n      touch1.clientY - touch0.clientY,\n      touch1.clientX - touch0.clientX);\n\n    if (this.lastAngle_ !== undefined) {\n      const delta = angle - this.lastAngle_;\n      this.rotationDelta_ += delta;\n      if (!this.rotating_ &&\n          Math.abs(this.rotationDelta_) > this.threshold_) {\n        this.rotating_ = true;\n      }\n      rotationDelta = delta;\n    }\n    this.lastAngle_ = angle;\n\n    const map = mapBrowserEvent.map;\n    const view = map.getView();\n    if (view.getConstraints().rotation === disable) {\n      return;\n    }\n\n    // rotate anchor point.\n    // FIXME: should be the intersection point between the lines:\n    //     touch0,touch1 and previousTouch0,previousTouch1\n    const viewportPosition = map.getViewport().getBoundingClientRect();\n    const centroid = centroidFromPointers(this.targetPointers);\n    centroid[0] -= viewportPosition.left;\n    centroid[1] -= viewportPosition.top;\n    this.anchor_ = map.getCoordinateFromPixel(centroid);\n\n    // rotate\n    if (this.rotating_) {\n      const rotation = view.getRotation();\n      map.render();\n      rotateWithoutConstraints(view, rotation + rotationDelta, this.anchor_);\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(mapBrowserEvent) {\n    if (this.targetPointers.length < 2) {\n      const map = mapBrowserEvent.map;\n      const view = map.getView();\n      view.setHint(ViewHint.INTERACTING, -1);\n      if (this.rotating_) {\n        const rotation = view.getRotation();\n        rotate(view, rotation, this.anchor_, this.duration_);\n      }\n      return false;\n    } else {\n      return true;\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDownEvent(mapBrowserEvent) {\n    if (this.targetPointers.length >= 2) {\n      const map = mapBrowserEvent.map;\n      this.anchor_ = null;\n      this.lastAngle_ = undefined;\n      this.rotating_ = false;\n      this.rotationDelta_ = 0.0;\n      if (!this.handlingDownUpSequence) {\n        map.getView().setHint(ViewHint.INTERACTING, 1);\n      }\n      return true;\n    } else {\n      return false;\n    }\n  }\n}\n\nexport default PinchRotate;\n","/**\n * @module ol/interaction/PinchZoom\n */\nimport ViewHint from '../ViewHint.js';\nimport {FALSE} from '../functions.js';\nimport {zoom, zoomWithoutConstraints} from './Interaction.js';\nimport PointerInteraction, {centroid as centroidFromPointers} from './Pointer.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [duration=400] Animation duration in milliseconds.\n * @property {boolean} [constrainResolution=false] Zoom to the closest integer\n * zoom level after the pinch gesture ends.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom the map by pinching with two fingers\n * on a touch screen.\n * @api\n */\nclass PinchZoom extends PointerInteraction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    const pointerOptions = /** @type {import(\"./Pointer.js\").Options} */ (options);\n\n    if (!pointerOptions.stopDown) {\n      pointerOptions.stopDown = FALSE;\n    }\n\n    super(pointerOptions);\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.constrainResolution_ = options.constrainResolution || false;\n\n    /**\n     * @private\n     * @type {import(\"../coordinate.js\").Coordinate}\n     */\n    this.anchor_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 400;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.lastDistance_ = undefined;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.lastScaleDelta_ = 1;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDragEvent(mapBrowserEvent) {\n    let scaleDelta = 1.0;\n\n    const touch0 = this.targetPointers[0];\n    const touch1 = this.targetPointers[1];\n    const dx = touch0.clientX - touch1.clientX;\n    const dy = touch0.clientY - touch1.clientY;\n\n    // distance between touches\n    const distance = Math.sqrt(dx * dx + dy * dy);\n\n    if (this.lastDistance_ !== undefined) {\n      scaleDelta = this.lastDistance_ / distance;\n    }\n    this.lastDistance_ = distance;\n\n\n    const map = mapBrowserEvent.map;\n    const view = map.getView();\n    const resolution = view.getResolution();\n    const maxResolution = view.getMaxResolution();\n    const minResolution = view.getMinResolution();\n    let newResolution = resolution * scaleDelta;\n    if (newResolution > maxResolution) {\n      scaleDelta = maxResolution / resolution;\n      newResolution = maxResolution;\n    } else if (newResolution < minResolution) {\n      scaleDelta = minResolution / resolution;\n      newResolution = minResolution;\n    }\n\n    if (scaleDelta != 1.0) {\n      this.lastScaleDelta_ = scaleDelta;\n    }\n\n    // scale anchor point.\n    const viewportPosition = map.getViewport().getBoundingClientRect();\n    const centroid = centroidFromPointers(this.targetPointers);\n    centroid[0] -= viewportPosition.left;\n    centroid[1] -= viewportPosition.top;\n    this.anchor_ = map.getCoordinateFromPixel(centroid);\n\n    // scale, bypass the resolution constraint\n    map.render();\n    zoomWithoutConstraints(view, newResolution, this.anchor_);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(mapBrowserEvent) {\n    if (this.targetPointers.length < 2) {\n      const map = mapBrowserEvent.map;\n      const view = map.getView();\n      view.setHint(ViewHint.INTERACTING, -1);\n      const resolution = view.getResolution();\n      if (this.constrainResolution_ ||\n          resolution < view.getMinResolution() ||\n          resolution > view.getMaxResolution()) {\n        // Zoom to final resolution, with an animation, and provide a\n        // direction not to zoom out/in if user was pinching in/out.\n        // Direction is > 0 if pinching out, and < 0 if pinching in.\n        const direction = this.lastScaleDelta_ - 1;\n        zoom(view, resolution, this.anchor_, this.duration_, direction);\n      }\n      return false;\n    } else {\n      return true;\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDownEvent(mapBrowserEvent) {\n    if (this.targetPointers.length >= 2) {\n      const map = mapBrowserEvent.map;\n      this.anchor_ = null;\n      this.lastDistance_ = undefined;\n      this.lastScaleDelta_ = 1;\n      if (!this.handlingDownUpSequence) {\n        map.getView().setHint(ViewHint.INTERACTING, 1);\n      }\n      return true;\n    } else {\n      return false;\n    }\n  }\n}\n\nexport default PinchZoom;\n","/**\n * @module ol/interaction/DragAndDrop\n */\n// FIXME should handle all geo-referenced data, not just vector data\n\nimport {TRUE} from '../functions.js';\nimport {listen, unlistenByKey} from '../events.js';\nimport Event from '../events/Event.js';\nimport EventType from '../events/EventType.js';\nimport Interaction from './Interaction.js';\nimport {get as getProjection} from '../proj.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {Array<typeof import(\"../format/Feature.js\").default>} [formatConstructors] Format constructors.\n * @property {import(\"../source/Vector.js\").default} [source] Optional vector source where features will be added.  If a source is provided\n * all existing features will be removed and new features will be added when\n * they are dropped on the target.  If you want to add features to a vector\n * source without removing the existing features (append only), instead of\n * providing the source option listen for the \"addfeatures\" event.\n * @property {import(\"../proj.js\").ProjectionLike} [projection] Target projection. By default, the map's view's projection is used.\n * @property {HTMLElement} [target] The element that is used as the drop target, default is the viewport element.\n */\n\n\n/**\n * @enum {string}\n */\nconst DragAndDropEventType = {\n  /**\n   * Triggered when features are added\n   * @event DragAndDropEvent#addfeatures\n   * @api\n   */\n  ADD_FEATURES: 'addfeatures'\n};\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/interaction/DragAndDrop~DragAndDrop} instances are instances\n * of this type.\n */\nclass DragAndDropEvent extends Event {\n\n  /**\n   * @param {DragAndDropEventType} type Type.\n   * @param {File} file File.\n   * @param {Array<import(\"../Feature.js\").default>=} opt_features Features.\n   * @param {import(\"../proj/Projection.js\").default=} opt_projection Projection.\n   */\n  constructor(type, file, opt_features, opt_projection) {\n\n    super(type);\n\n    /**\n     * The features parsed from dropped data.\n     * @type {Array<import(\"../Feature.js\").FeatureLike>|undefined}\n     * @api\n     */\n    this.features = opt_features;\n\n    /**\n     * The dropped file.\n     * @type {File}\n     * @api\n     */\n    this.file = file;\n\n    /**\n     * The feature projection.\n     * @type {import(\"../proj/Projection.js\").default|undefined}\n     * @api\n     */\n    this.projection = opt_projection;\n\n  }\n\n}\n\n\n/**\n * @classdesc\n * Handles input of vector data by drag and drop.\n * @api\n *\n * @fires DragAndDropEvent\n */\nclass DragAndDrop extends Interaction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super({\n      handleEvent: TRUE\n    });\n\n    /**\n     * @private\n     * @type {Array<typeof import(\"../format/Feature.js\").default>}\n     */\n    this.formatConstructors_ = options.formatConstructors ?\n      options.formatConstructors : [];\n\n    /**\n     * @private\n     * @type {import(\"../proj/Projection.js\").default}\n     */\n    this.projection_ = options.projection ?\n      getProjection(options.projection) : null;\n\n    /**\n     * @private\n     * @type {Array<import(\"../events.js\").EventsKey>}\n     */\n    this.dropListenKeys_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../source/Vector.js\").default}\n     */\n    this.source_ = options.source || null;\n\n    /**\n     * @private\n     * @type {HTMLElement}\n     */\n    this.target = options.target ? options.target : null;\n\n  }\n\n  /**\n   * @param {File} file File.\n   * @param {Event} event Load event.\n   * @private\n   */\n  handleResult_(file, event) {\n    const result = event.target.result;\n    const map = this.getMap();\n    let projection = this.projection_;\n    if (!projection) {\n      const view = map.getView();\n      projection = view.getProjection();\n    }\n\n    const formatConstructors = this.formatConstructors_;\n    let features = [];\n    for (let i = 0, ii = formatConstructors.length; i < ii; ++i) {\n      const format = new formatConstructors[i]();\n      features = this.tryReadFeatures_(format, result, {\n        featureProjection: projection\n      });\n      if (features && features.length > 0) {\n        break;\n      }\n    }\n    if (this.source_) {\n      this.source_.clear();\n      this.source_.addFeatures(features);\n    }\n    this.dispatchEvent(\n      new DragAndDropEvent(\n        DragAndDropEventType.ADD_FEATURES, file,\n        features, projection));\n  }\n\n  /**\n   * @private\n   */\n  registerListeners_() {\n    const map = this.getMap();\n    if (map) {\n      const dropArea = this.target ? this.target : map.getViewport();\n      this.dropListenKeys_ = [\n        listen(dropArea, EventType.DROP, handleDrop, this),\n        listen(dropArea, EventType.DRAGENTER, handleStop, this),\n        listen(dropArea, EventType.DRAGOVER, handleStop, this),\n        listen(dropArea, EventType.DROP, handleStop, this)\n      ];\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setActive(active) {\n    super.setActive(active);\n    if (active) {\n      this.registerListeners_();\n    } else {\n      this.unregisterListeners_();\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setMap(map) {\n    this.unregisterListeners_();\n    super.setMap(map);\n    if (this.getActive()) {\n      this.registerListeners_();\n    }\n  }\n\n  /**\n   * @param {import(\"../format/Feature.js\").default} format Format.\n   * @param {string} text Text.\n   * @param {import(\"../format/Feature.js\").ReadOptions} options Read options.\n   * @private\n   * @return {Array<import(\"../Feature.js\").FeatureLike>} Features.\n   */\n  tryReadFeatures_(format, text, options) {\n    try {\n      return format.readFeatures(text, options);\n    } catch (e) {\n      return null;\n    }\n  }\n\n  /**\n   * @private\n   */\n  unregisterListeners_() {\n    if (this.dropListenKeys_) {\n      this.dropListenKeys_.forEach(unlistenByKey);\n      this.dropListenKeys_ = null;\n    }\n  }\n}\n\n\n/**\n * @param {DragEvent} event Event.\n * @this {DragAndDrop}\n */\nfunction handleDrop(event) {\n  const files = event.dataTransfer.files;\n  for (let i = 0, ii = files.length; i < ii; ++i) {\n    const file = files.item(i);\n    const reader = new FileReader();\n    reader.addEventListener(EventType.LOAD, this.handleResult_.bind(this, file));\n    reader.readAsText(file);\n  }\n}\n\n\n/**\n * @param {DragEvent} event Event.\n */\nfunction handleStop(event) {\n  event.stopPropagation();\n  event.preventDefault();\n  event.dataTransfer.dropEffect = 'copy';\n}\n\n\nexport default DragAndDrop;\n","/**\n * @module ol/interaction/DragRotateAndZoom\n */\nimport {disable} from '../rotationconstraint.js';\nimport ViewHint from '../ViewHint.js';\nimport {shiftKeyOnly, mouseOnly} from '../events/condition.js';\nimport {rotate, rotateWithoutConstraints, zoom, zoomWithoutConstraints} from './Interaction.js';\nimport PointerInteraction from './Pointer.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled.\n * Default is {@link module:ol/events/condition~shiftKeyOnly}.\n * @property {number} [duration=400] Animation duration in milliseconds.\n */\n\n\n/**\n * @classdesc\n * Allows the user to zoom and rotate the map by clicking and dragging\n * on the map.  By default, this interaction is limited to when the shift\n * key is held down.\n *\n * This interaction is only supported for mouse devices.\n *\n * And this interaction is not included in the default interactions.\n * @api\n */\nclass DragRotateAndZoom extends PointerInteraction {\n\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    super(/** @type {import(\"./Pointer.js\").Options} */ (options));\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.condition_ = options.condition ? options.condition : shiftKeyOnly;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.lastAngle_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.lastMagnitude_ = undefined;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.lastScaleDelta_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.duration_ = options.duration !== undefined ? options.duration : 400;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDragEvent(mapBrowserEvent) {\n    if (!mouseOnly(mapBrowserEvent)) {\n      return;\n    }\n\n    const map = mapBrowserEvent.map;\n    const size = map.getSize();\n    const offset = mapBrowserEvent.pixel;\n    const deltaX = offset[0] - size[0] / 2;\n    const deltaY = size[1] / 2 - offset[1];\n    const theta = Math.atan2(deltaY, deltaX);\n    const magnitude = Math.sqrt(deltaX * deltaX + deltaY * deltaY);\n    const view = map.getView();\n    if (view.getConstraints().rotation !== disable && this.lastAngle_ !== undefined) {\n      const angleDelta = theta - this.lastAngle_;\n      rotateWithoutConstraints(view, view.getRotation() - angleDelta);\n    }\n    this.lastAngle_ = theta;\n    if (this.lastMagnitude_ !== undefined) {\n      const resolution = this.lastMagnitude_ * (view.getResolution() / magnitude);\n      zoomWithoutConstraints(view, resolution);\n    }\n    if (this.lastMagnitude_ !== undefined) {\n      this.lastScaleDelta_ = this.lastMagnitude_ / magnitude;\n    }\n    this.lastMagnitude_ = magnitude;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(mapBrowserEvent) {\n    if (!mouseOnly(mapBrowserEvent)) {\n      return true;\n    }\n\n    const map = mapBrowserEvent.map;\n    const view = map.getView();\n    view.setHint(ViewHint.INTERACTING, -1);\n    const direction = this.lastScaleDelta_ - 1;\n    rotate(view, view.getRotation());\n    zoom(view, view.getResolution(), undefined, this.duration_, direction);\n    this.lastScaleDelta_ = 0;\n    return false;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDownEvent(mapBrowserEvent) {\n    if (!mouseOnly(mapBrowserEvent)) {\n      return false;\n    }\n\n    if (this.condition_(mapBrowserEvent)) {\n      mapBrowserEvent.map.getView().setHint(ViewHint.INTERACTING, 1);\n      this.lastAngle_ = undefined;\n      this.lastMagnitude_ = undefined;\n      return true;\n    } else {\n      return false;\n    }\n  }\n}\n\nexport default DragRotateAndZoom;\n","/**\n * @module ol/Feature\n */\nimport {assert} from './asserts.js';\nimport {listen, unlisten, unlistenByKey} from './events.js';\nimport EventType from './events/EventType.js';\nimport BaseObject, {getChangeEventType} from './Object.js';\n\n/**\n * @typedef {typeof Feature|typeof import(\"./render/Feature.js\").default} FeatureClass\n */\n\n/**\n * @typedef {Feature|import(\"./render/Feature.js\").default} FeatureLike\n */\n\n/**\n * @classdesc\n * A vector object for geographic features with a geometry and other\n * attribute properties, similar to the features in vector file formats like\n * GeoJSON.\n *\n * Features can be styled individually with `setStyle`; otherwise they use the\n * style of their vector layer.\n *\n * Note that attribute properties are set as {@link module:ol/Object} properties on\n * the feature object, so they are observable, and have get/set accessors.\n *\n * Typically, a feature has a single geometry property. You can set the\n * geometry using the `setGeometry` method and get it with `getGeometry`.\n * It is possible to store more than one geometry on a feature using attribute\n * properties. By default, the geometry used for rendering is identified by\n * the property name `geometry`. If you want to use another geometry property\n * for rendering, use the `setGeometryName` method to change the attribute\n * property associated with the geometry for the feature.  For example:\n *\n * ```js\n *\n * import Feature from 'ol/Feature';\n * import Polygon from 'ol/geom/Polygon';\n * import Point from 'ol/geom/Point';\n *\n * var feature = new Feature({\n *   geometry: new Polygon(polyCoords),\n *   labelPoint: new Point(labelCoords),\n *   name: 'My Polygon'\n * });\n *\n * // get the polygon geometry\n * var poly = feature.getGeometry();\n *\n * // Render the feature as a point using the coordinates from labelPoint\n * feature.setGeometryName('labelPoint');\n *\n * // get the point geometry\n * var point = feature.getGeometry();\n * ```\n *\n * @api\n */\nclass Feature extends BaseObject {\n  /**\n   * @param {import(\"./geom/Geometry.js\").default|Object<string, *>=} opt_geometryOrProperties\n   *     You may pass a Geometry object directly, or an object literal containing\n   *     properties. If you pass an object literal, you may include a Geometry\n   *     associated with a `geometry` key.\n   */\n  constructor(opt_geometryOrProperties) {\n\n    super();\n\n    /**\n     * @private\n     * @type {number|string|undefined}\n     */\n    this.id_ = undefined;\n\n    /**\n     * @type {string}\n     * @private\n     */\n    this.geometryName_ = 'geometry';\n\n    /**\n     * User provided style.\n     * @private\n     * @type {import(\"./style/Style.js\").StyleLike}\n     */\n    this.style_ = null;\n\n    /**\n     * @private\n     * @type {import(\"./style/Style.js\").StyleFunction|undefined}\n     */\n    this.styleFunction_ = undefined;\n\n    /**\n     * @private\n     * @type {?import(\"./events.js\").EventsKey}\n     */\n    this.geometryChangeKey_ = null;\n\n    listen(\n      this, getChangeEventType(this.geometryName_),\n      this.handleGeometryChanged_, this);\n\n    if (opt_geometryOrProperties) {\n      if (typeof /** @type {?} */ (opt_geometryOrProperties).getSimplifiedGeometry === 'function') {\n        const geometry = /** @type {import(\"./geom/Geometry.js\").default} */ (opt_geometryOrProperties);\n        this.setGeometry(geometry);\n      } else {\n        /** @type {Object<string, *>} */\n        const properties = opt_geometryOrProperties;\n        this.setProperties(properties);\n      }\n    }\n  }\n\n  /**\n   * Clone this feature. If the original feature has a geometry it\n   * is also cloned. The feature id is not set in the clone.\n   * @return {Feature} The clone.\n   * @api\n   */\n  clone() {\n    const clone = new Feature(this.getProperties());\n    clone.setGeometryName(this.getGeometryName());\n    const geometry = this.getGeometry();\n    if (geometry) {\n      clone.setGeometry(geometry.clone());\n    }\n    const style = this.getStyle();\n    if (style) {\n      clone.setStyle(style);\n    }\n    return clone;\n  }\n\n  /**\n   * Get the feature's default geometry.  A feature may have any number of named\n   * geometries.  The \"default\" geometry (the one that is rendered by default) is\n   * set when calling {@link module:ol/Feature~Feature#setGeometry}.\n   * @return {import(\"./geom/Geometry.js\").default|undefined} The default geometry for the feature.\n   * @api\n   * @observable\n   */\n  getGeometry() {\n    return (\n      /** @type {import(\"./geom/Geometry.js\").default|undefined} */ (this.get(this.geometryName_))\n    );\n  }\n\n  /**\n   * Get the feature identifier.  This is a stable identifier for the feature and\n   * is either set when reading data from a remote source or set explicitly by\n   * calling {@link module:ol/Feature~Feature#setId}.\n   * @return {number|string|undefined} Id.\n   * @api\n   */\n  getId() {\n    return this.id_;\n  }\n\n  /**\n   * Get the name of the feature's default geometry.  By default, the default\n   * geometry is named `geometry`.\n   * @return {string} Get the property name associated with the default geometry\n   *     for this feature.\n   * @api\n   */\n  getGeometryName() {\n    return this.geometryName_;\n  }\n\n  /**\n   * Get the feature's style. Will return what was provided to the\n   * {@link module:ol/Feature~Feature#setStyle} method.\n   * @return {import(\"./style/Style.js\").StyleLike} The feature style.\n   * @api\n   */\n  getStyle() {\n    return this.style_;\n  }\n\n  /**\n   * Get the feature's style function.\n   * @return {import(\"./style/Style.js\").StyleFunction|undefined} Return a function\n   * representing the current style of this feature.\n   * @api\n   */\n  getStyleFunction() {\n    return this.styleFunction_;\n  }\n\n  /**\n   * @private\n   */\n  handleGeometryChange_() {\n    this.changed();\n  }\n\n  /**\n   * @private\n   */\n  handleGeometryChanged_() {\n    if (this.geometryChangeKey_) {\n      unlistenByKey(this.geometryChangeKey_);\n      this.geometryChangeKey_ = null;\n    }\n    const geometry = this.getGeometry();\n    if (geometry) {\n      this.geometryChangeKey_ = listen(geometry,\n        EventType.CHANGE, this.handleGeometryChange_, this);\n    }\n    this.changed();\n  }\n\n  /**\n   * Set the default geometry for the feature.  This will update the property\n   * with the name returned by {@link module:ol/Feature~Feature#getGeometryName}.\n   * @param {import(\"./geom/Geometry.js\").default|undefined} geometry The new geometry.\n   * @api\n   * @observable\n   */\n  setGeometry(geometry) {\n    this.set(this.geometryName_, geometry);\n  }\n\n  /**\n   * Set the style for the feature.  This can be a single style object, an array\n   * of styles, or a function that takes a resolution and returns an array of\n   * styles. If it is `null` the feature has no style (a `null` style).\n   * @param {import(\"./style/Style.js\").StyleLike} style Style for this feature.\n   * @api\n   * @fires module:ol/events/Event~Event#event:change\n   */\n  setStyle(style) {\n    this.style_ = style;\n    this.styleFunction_ = !style ? undefined : createStyleFunction(style);\n    this.changed();\n  }\n\n  /**\n   * Set the feature id.  The feature id is considered stable and may be used when\n   * requesting features or comparing identifiers returned from a remote source.\n   * The feature id can be used with the\n   * {@link module:ol/source/Vector~VectorSource#getFeatureById} method.\n   * @param {number|string|undefined} id The feature id.\n   * @api\n   * @fires module:ol/events/Event~Event#event:change\n   */\n  setId(id) {\n    this.id_ = id;\n    this.changed();\n  }\n\n  /**\n   * Set the property name to be used when getting the feature's default geometry.\n   * When calling {@link module:ol/Feature~Feature#getGeometry}, the value of the property with\n   * this name will be returned.\n   * @param {string} name The property name of the default geometry.\n   * @api\n   */\n  setGeometryName(name) {\n    unlisten(\n      this, getChangeEventType(this.geometryName_),\n      this.handleGeometryChanged_, this);\n    this.geometryName_ = name;\n    listen(\n      this, getChangeEventType(this.geometryName_),\n      this.handleGeometryChanged_, this);\n    this.handleGeometryChanged_();\n  }\n}\n\n\n/**\n * Convert the provided object into a feature style function.  Functions passed\n * through unchanged.  Arrays of Style or single style objects wrapped\n * in a new feature style function.\n * @param {!import(\"./style/Style.js\").StyleFunction|!Array<import(\"./style/Style.js\").default>|!import(\"./style/Style.js\").default} obj\n *     A feature style function, a single style, or an array of styles.\n * @return {import(\"./style/Style.js\").StyleFunction} A style function.\n */\nexport function createStyleFunction(obj) {\n  if (typeof obj === 'function') {\n    return obj;\n  } else {\n    /**\n     * @type {Array<import(\"./style/Style.js\").default>}\n     */\n    let styles;\n    if (Array.isArray(obj)) {\n      styles = obj;\n    } else {\n      assert(typeof /** @type {?} */ (obj).getZIndex === 'function',\n        41); // Expected an `import(\"./style/Style.js\").Style` or an array of `import(\"./style/Style.js\").Style`\n      const style = /** @type {import(\"./style/Style.js\").default} */ (obj);\n      styles = [style];\n    }\n    return function() {\n      return styles;\n    };\n  }\n}\nexport default Feature;\n","/**\n * @module ol/geom/Circle\n */\nimport {createOrUpdate, forEachCorner, intersects} from '../extent.js';\nimport GeometryType from './GeometryType.js';\nimport SimpleGeometry from './SimpleGeometry.js';\nimport {deflateCoordinate} from './flat/deflate.js';\n\n/**\n * @classdesc\n * Circle geometry.\n *\n * @api\n */\nclass Circle extends SimpleGeometry {\n\n  /**\n   * @param {!import(\"../coordinate.js\").Coordinate} center Center.\n   *     For internal use, flat coordinates in combination with `opt_layout` and no\n   *     `opt_radius` are also accepted.\n   * @param {number=} opt_radius Radius.\n   * @param {import(\"./GeometryLayout.js\").default=} opt_layout Layout.\n   */\n  constructor(center, opt_radius, opt_layout) {\n    super();\n    if (opt_layout !== undefined && opt_radius === undefined) {\n      this.setFlatCoordinates(opt_layout, center);\n    } else {\n      const radius = opt_radius ? opt_radius : 0;\n      this.setCenterAndRadius(center, radius, opt_layout);\n    }\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!Circle} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    return new Circle(this.flatCoordinates.slice(), undefined, this.layout);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    const flatCoordinates = this.flatCoordinates;\n    const dx = x - flatCoordinates[0];\n    const dy = y - flatCoordinates[1];\n    const squaredDistance = dx * dx + dy * dy;\n    if (squaredDistance < minSquaredDistance) {\n      if (squaredDistance === 0) {\n        for (let i = 0; i < this.stride; ++i) {\n          closestPoint[i] = flatCoordinates[i];\n        }\n      } else {\n        const delta = this.getRadius() / Math.sqrt(squaredDistance);\n        closestPoint[0] = flatCoordinates[0] + delta * dx;\n        closestPoint[1] = flatCoordinates[1] + delta * dy;\n        for (let i = 2; i < this.stride; ++i) {\n          closestPoint[i] = flatCoordinates[i];\n        }\n      }\n      closestPoint.length = this.stride;\n      return squaredDistance;\n    } else {\n      return minSquaredDistance;\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  containsXY(x, y) {\n    const flatCoordinates = this.flatCoordinates;\n    const dx = x - flatCoordinates[0];\n    const dy = y - flatCoordinates[1];\n    return dx * dx + dy * dy <= this.getRadiusSquared_();\n  }\n\n  /**\n   * Return the center of the circle as {@link module:ol/coordinate~Coordinate coordinate}.\n   * @return {import(\"../coordinate.js\").Coordinate} Center.\n   * @api\n   */\n  getCenter() {\n    return this.flatCoordinates.slice(0, this.stride);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  computeExtent(extent) {\n    const flatCoordinates = this.flatCoordinates;\n    const radius = flatCoordinates[this.stride] - flatCoordinates[0];\n    return createOrUpdate(\n      flatCoordinates[0] - radius, flatCoordinates[1] - radius,\n      flatCoordinates[0] + radius, flatCoordinates[1] + radius,\n      extent);\n  }\n\n  /**\n   * Return the radius of the circle.\n   * @return {number} Radius.\n   * @api\n   */\n  getRadius() {\n    return Math.sqrt(this.getRadiusSquared_());\n  }\n\n  /**\n   * @private\n   * @return {number} Radius squared.\n   */\n  getRadiusSquared_() {\n    const dx = this.flatCoordinates[this.stride] - this.flatCoordinates[0];\n    const dy = this.flatCoordinates[this.stride + 1] - this.flatCoordinates[1];\n    return dx * dx + dy * dy;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.CIRCLE;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    const circleExtent = this.getExtent();\n    if (intersects(extent, circleExtent)) {\n      const center = this.getCenter();\n\n      if (extent[0] <= center[0] && extent[2] >= center[0]) {\n        return true;\n      }\n      if (extent[1] <= center[1] && extent[3] >= center[1]) {\n        return true;\n      }\n\n      return forEachCorner(extent, this.intersectsCoordinate, this);\n    }\n    return false;\n\n  }\n\n  /**\n   * Set the center of the circle as {@link module:ol/coordinate~Coordinate coordinate}.\n   * @param {import(\"../coordinate.js\").Coordinate} center Center.\n   * @api\n   */\n  setCenter(center) {\n    const stride = this.stride;\n    const radius = this.flatCoordinates[stride] - this.flatCoordinates[0];\n    const flatCoordinates = center.slice();\n    flatCoordinates[stride] = flatCoordinates[0] + radius;\n    for (let i = 1; i < stride; ++i) {\n      flatCoordinates[stride + i] = center[i];\n    }\n    this.setFlatCoordinates(this.layout, flatCoordinates);\n    this.changed();\n  }\n\n  /**\n   * Set the center (as {@link module:ol/coordinate~Coordinate coordinate}) and the radius (as\n   * number) of the circle.\n   * @param {!import(\"../coordinate.js\").Coordinate} center Center.\n   * @param {number} radius Radius.\n   * @param {import(\"./GeometryLayout.js\").default=} opt_layout Layout.\n   * @api\n   */\n  setCenterAndRadius(center, radius, opt_layout) {\n    this.setLayout(opt_layout, center, 0);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    /** @type {Array<number>} */\n    const flatCoordinates = this.flatCoordinates;\n    let offset = deflateCoordinate(\n      flatCoordinates, 0, center, this.stride);\n    flatCoordinates[offset++] = flatCoordinates[0] + radius;\n    for (let i = 1, ii = this.stride; i < ii; ++i) {\n      flatCoordinates[offset++] = flatCoordinates[i];\n    }\n    flatCoordinates.length = offset;\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getCoordinates() {\n    return null;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setCoordinates(coordinates, opt_layout) {}\n\n  /**\n   * Set the radius of the circle. The radius is in the units of the projection.\n   * @param {number} radius Radius.\n   * @api\n   */\n  setRadius(radius) {\n    this.flatCoordinates[this.stride] = this.flatCoordinates[0] + radius;\n    this.changed();\n  }\n}\n\n\n/**\n * Transform each coordinate of the circle from one coordinate reference system\n * to another. The geometry is modified in place.\n * If you do not want the geometry modified in place, first clone() it and\n * then use this function on the clone.\n *\n * Internally a circle is currently represented by two points: the center of\n * the circle `[cx, cy]`, and the point to the right of the circle\n * `[cx + r, cy]`. This `transform` function just transforms these two points.\n * So the resulting geometry is also a circle, and that circle does not\n * correspond to the shape that would be obtained by transforming every point\n * of the original circle.\n *\n * @param {import(\"../proj.js\").ProjectionLike} source The current projection.  Can be a\n *     string identifier or a {@link module:ol/proj/Projection~Projection} object.\n * @param {import(\"../proj.js\").ProjectionLike} destination The desired projection.  Can be a\n *     string identifier or a {@link module:ol/proj/Projection~Projection} object.\n * @return {Circle} This geometry.  Note that original geometry is\n *     modified in place.\n * @function\n * @api\n */\nCircle.prototype.transform;\nexport default Circle;\n","/**\n * @module ol/geom/flat/interpolate\n */\nimport {binarySearch} from '../../array.js';\nimport {lerp} from '../../math.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} fraction Fraction.\n * @param {Array<number>=} opt_dest Destination.\n * @return {Array<number>} Destination.\n */\nexport function interpolatePoint(flatCoordinates, offset, end, stride, fraction, opt_dest) {\n  let pointX = NaN;\n  let pointY = NaN;\n  const n = (end - offset) / stride;\n  if (n === 1) {\n    pointX = flatCoordinates[offset];\n    pointY = flatCoordinates[offset + 1];\n  } else if (n == 2) {\n    pointX = (1 - fraction) * flatCoordinates[offset] +\n        fraction * flatCoordinates[offset + stride];\n    pointY = (1 - fraction) * flatCoordinates[offset + 1] +\n        fraction * flatCoordinates[offset + stride + 1];\n  } else if (n !== 0) {\n    let x1 = flatCoordinates[offset];\n    let y1 = flatCoordinates[offset + 1];\n    let length = 0;\n    const cumulativeLengths = [0];\n    for (let i = offset + stride; i < end; i += stride) {\n      const x2 = flatCoordinates[i];\n      const y2 = flatCoordinates[i + 1];\n      length += Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));\n      cumulativeLengths.push(length);\n      x1 = x2;\n      y1 = y2;\n    }\n    const target = fraction * length;\n    const index = binarySearch(cumulativeLengths, target);\n    if (index < 0) {\n      const t = (target - cumulativeLengths[-index - 2]) /\n          (cumulativeLengths[-index - 1] - cumulativeLengths[-index - 2]);\n      const o = offset + (-index - 2) * stride;\n      pointX = lerp(\n        flatCoordinates[o], flatCoordinates[o + stride], t);\n      pointY = lerp(\n        flatCoordinates[o + 1], flatCoordinates[o + stride + 1], t);\n    } else {\n      pointX = flatCoordinates[offset + index * stride];\n      pointY = flatCoordinates[offset + index * stride + 1];\n    }\n  }\n  if (opt_dest) {\n    opt_dest[0] = pointX;\n    opt_dest[1] = pointY;\n    return opt_dest;\n  } else {\n    return [pointX, pointY];\n  }\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @param {number} m M.\n * @param {boolean} extrapolate Extrapolate.\n * @return {import(\"../../coordinate.js\").Coordinate} Coordinate.\n */\nexport function lineStringCoordinateAtM(flatCoordinates, offset, end, stride, m, extrapolate) {\n  if (end == offset) {\n    return null;\n  }\n  let coordinate;\n  if (m < flatCoordinates[offset + stride - 1]) {\n    if (extrapolate) {\n      coordinate = flatCoordinates.slice(offset, offset + stride);\n      coordinate[stride - 1] = m;\n      return coordinate;\n    } else {\n      return null;\n    }\n  } else if (flatCoordinates[end - 1] < m) {\n    if (extrapolate) {\n      coordinate = flatCoordinates.slice(end - stride, end);\n      coordinate[stride - 1] = m;\n      return coordinate;\n    } else {\n      return null;\n    }\n  }\n  // FIXME use O(1) search\n  if (m == flatCoordinates[offset + stride - 1]) {\n    return flatCoordinates.slice(offset, offset + stride);\n  }\n  let lo = offset / stride;\n  let hi = end / stride;\n  while (lo < hi) {\n    const mid = (lo + hi) >> 1;\n    if (m < flatCoordinates[(mid + 1) * stride - 1]) {\n      hi = mid;\n    } else {\n      lo = mid + 1;\n    }\n  }\n  const m0 = flatCoordinates[lo * stride - 1];\n  if (m == m0) {\n    return flatCoordinates.slice((lo - 1) * stride, (lo - 1) * stride + stride);\n  }\n  const m1 = flatCoordinates[(lo + 1) * stride - 1];\n  const t = (m - m0) / (m1 - m0);\n  coordinate = [];\n  for (let i = 0; i < stride - 1; ++i) {\n    coordinate.push(lerp(flatCoordinates[(lo - 1) * stride + i],\n      flatCoordinates[lo * stride + i], t));\n  }\n  coordinate.push(m);\n  return coordinate;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<number>} ends Ends.\n * @param {number} stride Stride.\n * @param {number} m M.\n * @param {boolean} extrapolate Extrapolate.\n * @param {boolean} interpolate Interpolate.\n * @return {import(\"../../coordinate.js\").Coordinate} Coordinate.\n */\nexport function lineStringsCoordinateAtM(\n  flatCoordinates, offset, ends, stride, m, extrapolate, interpolate) {\n  if (interpolate) {\n    return lineStringCoordinateAtM(\n      flatCoordinates, offset, ends[ends.length - 1], stride, m, extrapolate);\n  }\n  let coordinate;\n  if (m < flatCoordinates[stride - 1]) {\n    if (extrapolate) {\n      coordinate = flatCoordinates.slice(0, stride);\n      coordinate[stride - 1] = m;\n      return coordinate;\n    } else {\n      return null;\n    }\n  }\n  if (flatCoordinates[flatCoordinates.length - 1] < m) {\n    if (extrapolate) {\n      coordinate = flatCoordinates.slice(flatCoordinates.length - stride);\n      coordinate[stride - 1] = m;\n      return coordinate;\n    } else {\n      return null;\n    }\n  }\n  for (let i = 0, ii = ends.length; i < ii; ++i) {\n    const end = ends[i];\n    if (offset == end) {\n      continue;\n    }\n    if (m < flatCoordinates[offset + stride - 1]) {\n      return null;\n    } else if (m <= flatCoordinates[end - 1]) {\n      return lineStringCoordinateAtM(\n        flatCoordinates, offset, end, stride, m, false);\n    }\n    offset = end;\n  }\n  return null;\n}\n","/**\n * @module ol/geom/flat/length\n */\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {number} Length.\n */\nexport function lineStringLength(flatCoordinates, offset, end, stride) {\n  let x1 = flatCoordinates[offset];\n  let y1 = flatCoordinates[offset + 1];\n  let length = 0;\n  for (let i = offset + stride; i < end; i += stride) {\n    const x2 = flatCoordinates[i];\n    const y2 = flatCoordinates[i + 1];\n    length += Math.sqrt((x2 - x1) * (x2 - x1) + (y2 - y1) * (y2 - y1));\n    x1 = x2;\n    y1 = y2;\n  }\n  return length;\n}\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {number} Perimeter.\n */\nexport function linearRingLength(flatCoordinates, offset, end, stride) {\n  let perimeter = lineStringLength(flatCoordinates, offset, end, stride);\n  const dx = flatCoordinates[end - stride] - flatCoordinates[offset];\n  const dy = flatCoordinates[end - stride + 1] - flatCoordinates[offset + 1];\n  perimeter += Math.sqrt(dx * dx + dy * dy);\n  return perimeter;\n}\n","/**\n * @module ol/geom/LineString\n */\nimport {extend} from '../array.js';\nimport {closestSquaredDistanceXY} from '../extent.js';\nimport GeometryLayout from './GeometryLayout.js';\nimport GeometryType from './GeometryType.js';\nimport SimpleGeometry from './SimpleGeometry.js';\nimport {assignClosestPoint, maxSquaredDelta} from './flat/closest.js';\nimport {deflateCoordinates} from './flat/deflate.js';\nimport {inflateCoordinates} from './flat/inflate.js';\nimport {interpolatePoint, lineStringCoordinateAtM} from './flat/interpolate.js';\nimport {intersectsLineString} from './flat/intersectsextent.js';\nimport {lineStringLength} from './flat/length.js';\nimport {forEach as forEachSegment} from './flat/segments.js';\nimport {douglasPeucker} from './flat/simplify.js';\n\n/**\n * @classdesc\n * Linestring geometry.\n *\n * @api\n */\nclass LineString extends SimpleGeometry {\n\n  /**\n   * @param {Array<import(\"../coordinate.js\").Coordinate>|Array<number>} coordinates Coordinates.\n   *     For internal use, flat coordinates in combination with `opt_layout` are also accepted.\n   * @param {GeometryLayout=} opt_layout Layout.\n   */\n  constructor(coordinates, opt_layout) {\n\n    super();\n\n    /**\n     * @private\n     * @type {import(\"../coordinate.js\").Coordinate}\n     */\n    this.flatMidpoint_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.flatMidpointRevision_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDelta_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDeltaRevision_ = -1;\n\n    if (opt_layout !== undefined && !Array.isArray(coordinates[0])) {\n      this.setFlatCoordinates(opt_layout, /** @type {Array<number>} */ (coordinates));\n    } else {\n      this.setCoordinates(/** @type {Array<import(\"../coordinate.js\").Coordinate>} */ (coordinates), opt_layout);\n    }\n\n  }\n\n  /**\n   * Append the passed coordinate to the coordinates of the linestring.\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @api\n   */\n  appendCoordinate(coordinate) {\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = coordinate.slice();\n    } else {\n      extend(this.flatCoordinates, coordinate);\n    }\n    this.changed();\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!LineString} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    return new LineString(this.flatCoordinates.slice(), this.layout);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    if (this.maxDeltaRevision_ != this.getRevision()) {\n      this.maxDelta_ = Math.sqrt(maxSquaredDelta(\n        this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, 0));\n      this.maxDeltaRevision_ = this.getRevision();\n    }\n    return assignClosestPoint(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      this.maxDelta_, false, x, y, closestPoint, minSquaredDistance);\n  }\n\n  /**\n   * Iterate over each segment, calling the provided callback.\n   * If the callback returns a truthy value the function returns that\n   * value immediately. Otherwise the function returns `false`.\n   *\n   * @param {function(this: S, import(\"../coordinate.js\").Coordinate, import(\"../coordinate.js\").Coordinate): T} callback Function\n   *     called for each segment.\n   * @return {T|boolean} Value.\n   * @template T,S\n   * @api\n   */\n  forEachSegment(callback) {\n    return forEachSegment(this.flatCoordinates, 0, this.flatCoordinates.length, this.stride, callback);\n  }\n\n  /**\n   * Returns the coordinate at `m` using linear interpolation, or `null` if no\n   * such coordinate exists.\n   *\n   * `opt_extrapolate` controls extrapolation beyond the range of Ms in the\n   * MultiLineString. If `opt_extrapolate` is `true` then Ms less than the first\n   * M will return the first coordinate and Ms greater than the last M will\n   * return the last coordinate.\n   *\n   * @param {number} m M.\n   * @param {boolean=} opt_extrapolate Extrapolate. Default is `false`.\n   * @return {import(\"../coordinate.js\").Coordinate} Coordinate.\n   * @api\n   */\n  getCoordinateAtM(m, opt_extrapolate) {\n    if (this.layout != GeometryLayout.XYM &&\n        this.layout != GeometryLayout.XYZM) {\n      return null;\n    }\n    const extrapolate = opt_extrapolate !== undefined ? opt_extrapolate : false;\n    return lineStringCoordinateAtM(this.flatCoordinates, 0,\n      this.flatCoordinates.length, this.stride, m, extrapolate);\n  }\n\n  /**\n   * Return the coordinates of the linestring.\n   * @return {Array<import(\"../coordinate.js\").Coordinate>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates() {\n    return inflateCoordinates(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);\n  }\n\n  /**\n   * Return the coordinate at the provided fraction along the linestring.\n   * The `fraction` is a number between 0 and 1, where 0 is the start of the\n   * linestring and 1 is the end.\n   * @param {number} fraction Fraction.\n   * @param {import(\"../coordinate.js\").Coordinate=} opt_dest Optional coordinate whose values will\n   *     be modified. If not provided, a new coordinate will be returned.\n   * @return {import(\"../coordinate.js\").Coordinate} Coordinate of the interpolated point.\n   * @api\n   */\n  getCoordinateAt(fraction, opt_dest) {\n    return interpolatePoint(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      fraction, opt_dest);\n  }\n\n  /**\n   * Return the length of the linestring on projected plane.\n   * @return {number} Length (on projected plane).\n   * @api\n   */\n  getLength() {\n    return lineStringLength(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);\n  }\n\n  /**\n   * @return {Array<number>} Flat midpoint.\n   */\n  getFlatMidpoint() {\n    if (this.flatMidpointRevision_ != this.getRevision()) {\n      this.flatMidpoint_ = this.getCoordinateAt(0.5, this.flatMidpoint_);\n      this.flatMidpointRevision_ = this.getRevision();\n    }\n    return this.flatMidpoint_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    const simplifiedFlatCoordinates = [];\n    simplifiedFlatCoordinates.length = douglasPeucker(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      squaredTolerance, simplifiedFlatCoordinates, 0);\n    return new LineString(simplifiedFlatCoordinates, GeometryLayout.XY);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.LINE_STRING;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    return intersectsLineString(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride,\n      extent);\n  }\n\n  /**\n   * Set the coordinates of the linestring.\n   * @param {!Array<import(\"../coordinate.js\").Coordinate>} coordinates Coordinates.\n   * @param {GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 1);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    this.flatCoordinates.length = deflateCoordinates(\n      this.flatCoordinates, 0, coordinates, this.stride);\n    this.changed();\n  }\n}\n\n\nexport default LineString;\n","/**\n * @module ol/geom/MultiLineString\n */\nimport {extend} from '../array.js';\nimport {closestSquaredDistanceXY} from '../extent.js';\nimport GeometryLayout from './GeometryLayout.js';\nimport GeometryType from './GeometryType.js';\nimport LineString from './LineString.js';\nimport SimpleGeometry from './SimpleGeometry.js';\nimport {assignClosestArrayPoint, arrayMaxSquaredDelta} from './flat/closest.js';\nimport {deflateCoordinatesArray} from './flat/deflate.js';\nimport {inflateCoordinatesArray} from './flat/inflate.js';\nimport {interpolatePoint, lineStringsCoordinateAtM} from './flat/interpolate.js';\nimport {intersectsLineStringArray} from './flat/intersectsextent.js';\nimport {douglasPeuckerArray} from './flat/simplify.js';\n\n/**\n * @classdesc\n * Multi-linestring geometry.\n *\n * @api\n */\nclass MultiLineString extends SimpleGeometry {\n\n  /**\n   * @param {Array<Array<import(\"../coordinate.js\").Coordinate>|LineString>|Array<number>} coordinates\n   *     Coordinates or LineString geometries. (For internal use, flat coordinates in\n   *     combination with `opt_layout` and `opt_ends` are also accepted.)\n   * @param {GeometryLayout=} opt_layout Layout.\n   * @param {Array<number>=} opt_ends Flat coordinate ends for internal use.\n   */\n  constructor(coordinates, opt_layout, opt_ends) {\n\n    super();\n\n    /**\n     * @type {Array<number>}\n     * @private\n     */\n    this.ends_ = [];\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDelta_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDeltaRevision_ = -1;\n\n    if (Array.isArray(coordinates[0])) {\n      this.setCoordinates(/** @type {Array<Array<import(\"../coordinate.js\").Coordinate>>} */ (coordinates), opt_layout);\n    } else if (opt_layout !== undefined && opt_ends) {\n      this.setFlatCoordinates(opt_layout, /** @type {Array<number>} */ (coordinates));\n      this.ends_ = opt_ends;\n    } else {\n      let layout = this.getLayout();\n      const lineStrings = /** @type {Array<LineString>} */ (coordinates);\n      const flatCoordinates = [];\n      const ends = [];\n      for (let i = 0, ii = lineStrings.length; i < ii; ++i) {\n        const lineString = lineStrings[i];\n        if (i === 0) {\n          layout = lineString.getLayout();\n        }\n        extend(flatCoordinates, lineString.getFlatCoordinates());\n        ends.push(flatCoordinates.length);\n      }\n      this.setFlatCoordinates(layout, flatCoordinates);\n      this.ends_ = ends;\n    }\n\n  }\n\n  /**\n   * Append the passed linestring to the multilinestring.\n   * @param {LineString} lineString LineString.\n   * @api\n   */\n  appendLineString(lineString) {\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = lineString.getFlatCoordinates().slice();\n    } else {\n      extend(this.flatCoordinates, lineString.getFlatCoordinates().slice());\n    }\n    this.ends_.push(this.flatCoordinates.length);\n    this.changed();\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!MultiLineString} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    return new MultiLineString(this.flatCoordinates.slice(), this.layout, this.ends_.slice());\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    if (this.maxDeltaRevision_ != this.getRevision()) {\n      this.maxDelta_ = Math.sqrt(arrayMaxSquaredDelta(\n        this.flatCoordinates, 0, this.ends_, this.stride, 0));\n      this.maxDeltaRevision_ = this.getRevision();\n    }\n    return assignClosestArrayPoint(\n      this.flatCoordinates, 0, this.ends_, this.stride,\n      this.maxDelta_, false, x, y, closestPoint, minSquaredDistance);\n  }\n\n  /**\n   * Returns the coordinate at `m` using linear interpolation, or `null` if no\n   * such coordinate exists.\n   *\n   * `opt_extrapolate` controls extrapolation beyond the range of Ms in the\n   * MultiLineString. If `opt_extrapolate` is `true` then Ms less than the first\n   * M will return the first coordinate and Ms greater than the last M will\n   * return the last coordinate.\n   *\n   * `opt_interpolate` controls interpolation between consecutive LineStrings\n   * within the MultiLineString. If `opt_interpolate` is `true` the coordinates\n   * will be linearly interpolated between the last coordinate of one LineString\n   * and the first coordinate of the next LineString.  If `opt_interpolate` is\n   * `false` then the function will return `null` for Ms falling between\n   * LineStrings.\n   *\n   * @param {number} m M.\n   * @param {boolean=} opt_extrapolate Extrapolate. Default is `false`.\n   * @param {boolean=} opt_interpolate Interpolate. Default is `false`.\n   * @return {import(\"../coordinate.js\").Coordinate} Coordinate.\n   * @api\n   */\n  getCoordinateAtM(m, opt_extrapolate, opt_interpolate) {\n    if ((this.layout != GeometryLayout.XYM &&\n         this.layout != GeometryLayout.XYZM) ||\n        this.flatCoordinates.length === 0) {\n      return null;\n    }\n    const extrapolate = opt_extrapolate !== undefined ? opt_extrapolate : false;\n    const interpolate = opt_interpolate !== undefined ? opt_interpolate : false;\n    return lineStringsCoordinateAtM(this.flatCoordinates, 0,\n      this.ends_, this.stride, m, extrapolate, interpolate);\n  }\n\n  /**\n   * Return the coordinates of the multilinestring.\n   * @return {Array<Array<import(\"../coordinate.js\").Coordinate>>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates() {\n    return inflateCoordinatesArray(\n      this.flatCoordinates, 0, this.ends_, this.stride);\n  }\n\n  /**\n   * @return {Array<number>} Ends.\n   */\n  getEnds() {\n    return this.ends_;\n  }\n\n  /**\n   * Return the linestring at the specified index.\n   * @param {number} index Index.\n   * @return {LineString} LineString.\n   * @api\n   */\n  getLineString(index) {\n    if (index < 0 || this.ends_.length <= index) {\n      return null;\n    }\n    return new LineString(this.flatCoordinates.slice(\n      index === 0 ? 0 : this.ends_[index - 1], this.ends_[index]), this.layout);\n  }\n\n  /**\n   * Return the linestrings of this multilinestring.\n   * @return {Array<LineString>} LineStrings.\n   * @api\n   */\n  getLineStrings() {\n    const flatCoordinates = this.flatCoordinates;\n    const ends = this.ends_;\n    const layout = this.layout;\n    /** @type {Array<LineString>} */\n    const lineStrings = [];\n    let offset = 0;\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      const end = ends[i];\n      const lineString = new LineString(flatCoordinates.slice(offset, end), layout);\n      lineStrings.push(lineString);\n      offset = end;\n    }\n    return lineStrings;\n  }\n\n  /**\n   * @return {Array<number>} Flat midpoints.\n   */\n  getFlatMidpoints() {\n    const midpoints = [];\n    const flatCoordinates = this.flatCoordinates;\n    let offset = 0;\n    const ends = this.ends_;\n    const stride = this.stride;\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      const end = ends[i];\n      const midpoint = interpolatePoint(\n        flatCoordinates, offset, end, stride, 0.5);\n      extend(midpoints, midpoint);\n      offset = end;\n    }\n    return midpoints;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    const simplifiedFlatCoordinates = [];\n    const simplifiedEnds = [];\n    simplifiedFlatCoordinates.length = douglasPeuckerArray(\n      this.flatCoordinates, 0, this.ends_, this.stride, squaredTolerance,\n      simplifiedFlatCoordinates, 0, simplifiedEnds);\n    return new MultiLineString(simplifiedFlatCoordinates, GeometryLayout.XY, simplifiedEnds);\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.MULTI_LINE_STRING;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    return intersectsLineStringArray(\n      this.flatCoordinates, 0, this.ends_, this.stride, extent);\n  }\n\n  /**\n   * Set the coordinates of the multilinestring.\n   * @param {!Array<Array<import(\"../coordinate.js\").Coordinate>>} coordinates Coordinates.\n   * @param {GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 2);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    const ends = deflateCoordinatesArray(\n      this.flatCoordinates, 0, coordinates, this.stride, this.ends_);\n    this.flatCoordinates.length = ends.length === 0 ? 0 : ends[ends.length - 1];\n    this.changed();\n  }\n}\n\n\nexport default MultiLineString;\n","/**\n * @module ol/geom/MultiPoint\n */\nimport {extend} from '../array.js';\nimport {closestSquaredDistanceXY, containsXY} from '../extent.js';\nimport GeometryType from './GeometryType.js';\nimport Point from './Point.js';\nimport SimpleGeometry from './SimpleGeometry.js';\nimport {deflateCoordinates} from './flat/deflate.js';\nimport {inflateCoordinates} from './flat/inflate.js';\nimport {squaredDistance as squaredDx} from '../math.js';\n\n/**\n * @classdesc\n * Multi-point geometry.\n *\n * @api\n */\nclass MultiPoint extends SimpleGeometry {\n\n  /**\n   * @param {Array<import(\"../coordinate.js\").Coordinate>|Array<number>} coordinates Coordinates.\n   *     For internal use, flat coordinates in combination with `opt_layout` are also accepted.\n   * @param {import(\"./GeometryLayout.js\").default=} opt_layout Layout.\n   */\n  constructor(coordinates, opt_layout) {\n    super();\n    if (opt_layout && !Array.isArray(coordinates[0])) {\n      this.setFlatCoordinates(opt_layout, /** @type {Array<number>} */ (coordinates));\n    } else {\n      this.setCoordinates(/** @type {Array<import(\"../coordinate.js\").Coordinate>} */ (coordinates), opt_layout);\n    }\n  }\n\n  /**\n   * Append the passed point to this multipoint.\n   * @param {Point} point Point.\n   * @api\n   */\n  appendPoint(point) {\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = point.getFlatCoordinates().slice();\n    } else {\n      extend(this.flatCoordinates, point.getFlatCoordinates());\n    }\n    this.changed();\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!MultiPoint} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    const multiPoint = new MultiPoint(this.flatCoordinates.slice(), this.layout);\n    return multiPoint;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    const flatCoordinates = this.flatCoordinates;\n    const stride = this.stride;\n    for (let i = 0, ii = flatCoordinates.length; i < ii; i += stride) {\n      const squaredDistance = squaredDx(\n        x, y, flatCoordinates[i], flatCoordinates[i + 1]);\n      if (squaredDistance < minSquaredDistance) {\n        minSquaredDistance = squaredDistance;\n        for (let j = 0; j < stride; ++j) {\n          closestPoint[j] = flatCoordinates[i + j];\n        }\n        closestPoint.length = stride;\n      }\n    }\n    return minSquaredDistance;\n  }\n\n  /**\n   * Return the coordinates of the multipoint.\n   * @return {Array<import(\"../coordinate.js\").Coordinate>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates() {\n    return inflateCoordinates(\n      this.flatCoordinates, 0, this.flatCoordinates.length, this.stride);\n  }\n\n  /**\n   * Return the point at the specified index.\n   * @param {number} index Index.\n   * @return {Point} Point.\n   * @api\n   */\n  getPoint(index) {\n    const n = !this.flatCoordinates ? 0 : this.flatCoordinates.length / this.stride;\n    if (index < 0 || n <= index) {\n      return null;\n    }\n    return new Point(this.flatCoordinates.slice(\n      index * this.stride, (index + 1) * this.stride), this.layout);\n  }\n\n  /**\n   * Return the points of this multipoint.\n   * @return {Array<Point>} Points.\n   * @api\n   */\n  getPoints() {\n    const flatCoordinates = this.flatCoordinates;\n    const layout = this.layout;\n    const stride = this.stride;\n    /** @type {Array<Point>} */\n    const points = [];\n    for (let i = 0, ii = flatCoordinates.length; i < ii; i += stride) {\n      const point = new Point(flatCoordinates.slice(i, i + stride), layout);\n      points.push(point);\n    }\n    return points;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.MULTI_POINT;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    const flatCoordinates = this.flatCoordinates;\n    const stride = this.stride;\n    for (let i = 0, ii = flatCoordinates.length; i < ii; i += stride) {\n      const x = flatCoordinates[i];\n      const y = flatCoordinates[i + 1];\n      if (containsXY(extent, x, y)) {\n        return true;\n      }\n    }\n    return false;\n  }\n\n  /**\n   * Set the coordinates of the multipoint.\n   * @param {!Array<import(\"../coordinate.js\").Coordinate>} coordinates Coordinates.\n   * @param {import(\"./GeometryLayout.js\").default=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 1);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    this.flatCoordinates.length = deflateCoordinates(\n      this.flatCoordinates, 0, coordinates, this.stride);\n    this.changed();\n  }\n}\n\n\nexport default MultiPoint;\n","/**\n * @module ol/geom/flat/center\n */\nimport {createEmpty, createOrUpdateFromFlatCoordinates} from '../../extent.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {Array<Array<number>>} endss Endss.\n * @param {number} stride Stride.\n * @return {Array<number>} Flat centers.\n */\nexport function linearRingss(flatCoordinates, offset, endss, stride) {\n  const flatCenters = [];\n  let extent = createEmpty();\n  for (let i = 0, ii = endss.length; i < ii; ++i) {\n    const ends = endss[i];\n    extent = createOrUpdateFromFlatCoordinates(flatCoordinates, offset, ends[0], stride);\n    flatCenters.push((extent[0] + extent[2]) / 2, (extent[1] + extent[3]) / 2);\n    offset = ends[ends.length - 1];\n  }\n  return flatCenters;\n}\n","/**\n * @module ol/geom/MultiPolygon\n */\nimport {extend} from '../array.js';\nimport {closestSquaredDistanceXY} from '../extent.js';\nimport GeometryLayout from './GeometryLayout.js';\nimport GeometryType from './GeometryType.js';\nimport MultiPoint from './MultiPoint.js';\nimport Polygon from './Polygon.js';\nimport SimpleGeometry from './SimpleGeometry.js';\nimport {linearRingss as linearRingssArea} from './flat/area.js';\nimport {linearRingss as linearRingssCenter} from './flat/center.js';\nimport {assignClosestMultiArrayPoint, multiArrayMaxSquaredDelta} from './flat/closest.js';\nimport {linearRingssContainsXY} from './flat/contains.js';\nimport {deflateMultiCoordinatesArray} from './flat/deflate.js';\nimport {inflateMultiCoordinatesArray} from './flat/inflate.js';\nimport {getInteriorPointsOfMultiArray} from './flat/interiorpoint.js';\nimport {intersectsLinearRingMultiArray} from './flat/intersectsextent.js';\nimport {linearRingsAreOriented, orientLinearRingsArray} from './flat/orient.js';\nimport {quantizeMultiArray} from './flat/simplify.js';\n\n/**\n * @classdesc\n * Multi-polygon geometry.\n *\n * @api\n */\nclass MultiPolygon extends SimpleGeometry {\n\n  /**\n   * @param {Array<Array<Array<import(\"../coordinate.js\").Coordinate>>|Polygon>|Array<number>} coordinates Coordinates.\n   *     For internal use, flat coordinates in combination with `opt_layout` and `opt_endss` are also accepted.\n   * @param {GeometryLayout=} opt_layout Layout.\n   * @param {Array<Array<number>>=} opt_endss Array of ends for internal use with flat coordinates.\n   */\n  constructor(coordinates, opt_layout, opt_endss) {\n\n    super();\n\n    /**\n     * @type {Array<Array<number>>}\n     * @private\n     */\n    this.endss_ = [];\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.flatInteriorPointsRevision_ = -1;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.flatInteriorPoints_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDelta_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.maxDeltaRevision_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.orientedRevision_ = -1;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.orientedFlatCoordinates_ = null;\n\n    if (!opt_endss && !Array.isArray(coordinates[0])) {\n      let layout = this.getLayout();\n      const polygons = /** @type {Array<Polygon>} */ (coordinates);\n      const flatCoordinates = [];\n      const endss = [];\n      for (let i = 0, ii = polygons.length; i < ii; ++i) {\n        const polygon = polygons[i];\n        if (i === 0) {\n          layout = polygon.getLayout();\n        }\n        const offset = flatCoordinates.length;\n        const ends = polygon.getEnds();\n        for (let j = 0, jj = ends.length; j < jj; ++j) {\n          ends[j] += offset;\n        }\n        extend(flatCoordinates, polygon.getFlatCoordinates());\n        endss.push(ends);\n      }\n      opt_layout = layout;\n      coordinates = flatCoordinates;\n      opt_endss = endss;\n    }\n    if (opt_layout !== undefined && opt_endss) {\n      this.setFlatCoordinates(opt_layout, /** @type {Array<number>} */ (coordinates));\n      this.endss_ = opt_endss;\n    } else {\n      this.setCoordinates(/** @type {Array<Array<Array<import(\"../coordinate.js\").Coordinate>>>} */ (coordinates),\n        opt_layout);\n    }\n\n  }\n\n  /**\n   * Append the passed polygon to this multipolygon.\n   * @param {Polygon} polygon Polygon.\n   * @api\n   */\n  appendPolygon(polygon) {\n    /** @type {Array<number>} */\n    let ends;\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = polygon.getFlatCoordinates().slice();\n      ends = polygon.getEnds().slice();\n      this.endss_.push();\n    } else {\n      const offset = this.flatCoordinates.length;\n      extend(this.flatCoordinates, polygon.getFlatCoordinates());\n      ends = polygon.getEnds().slice();\n      for (let i = 0, ii = ends.length; i < ii; ++i) {\n        ends[i] += offset;\n      }\n    }\n    this.endss_.push(ends);\n    this.changed();\n  }\n\n  /**\n   * Make a complete copy of the geometry.\n   * @return {!MultiPolygon} Clone.\n   * @override\n   * @api\n   */\n  clone() {\n    const len = this.endss_.length;\n    const newEndss = new Array(len);\n    for (let i = 0; i < len; ++i) {\n      newEndss[i] = this.endss_[i].slice();\n    }\n\n    return new MultiPolygon(\n      this.flatCoordinates.slice(), this.layout, newEndss);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  closestPointXY(x, y, closestPoint, minSquaredDistance) {\n    if (minSquaredDistance < closestSquaredDistanceXY(this.getExtent(), x, y)) {\n      return minSquaredDistance;\n    }\n    if (this.maxDeltaRevision_ != this.getRevision()) {\n      this.maxDelta_ = Math.sqrt(multiArrayMaxSquaredDelta(\n        this.flatCoordinates, 0, this.endss_, this.stride, 0));\n      this.maxDeltaRevision_ = this.getRevision();\n    }\n    return assignClosestMultiArrayPoint(\n      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride,\n      this.maxDelta_, true, x, y, closestPoint, minSquaredDistance);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  containsXY(x, y) {\n    return linearRingssContainsXY(this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride, x, y);\n  }\n\n  /**\n   * Return the area of the multipolygon on projected plane.\n   * @return {number} Area (on projected plane).\n   * @api\n   */\n  getArea() {\n    return linearRingssArea(this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride);\n  }\n\n  /**\n   * Get the coordinate array for this geometry.  This array has the structure\n   * of a GeoJSON coordinate array for multi-polygons.\n   *\n   * @param {boolean=} opt_right Orient coordinates according to the right-hand\n   *     rule (counter-clockwise for exterior and clockwise for interior rings).\n   *     If `false`, coordinates will be oriented according to the left-hand rule\n   *     (clockwise for exterior and counter-clockwise for interior rings).\n   *     By default, coordinate orientation will depend on how the geometry was\n   *     constructed.\n   * @return {Array<Array<Array<import(\"../coordinate.js\").Coordinate>>>} Coordinates.\n   * @override\n   * @api\n   */\n  getCoordinates(opt_right) {\n    let flatCoordinates;\n    if (opt_right !== undefined) {\n      flatCoordinates = this.getOrientedFlatCoordinates().slice();\n      orientLinearRingsArray(\n        flatCoordinates, 0, this.endss_, this.stride, opt_right);\n    } else {\n      flatCoordinates = this.flatCoordinates;\n    }\n\n    return inflateMultiCoordinatesArray(\n      flatCoordinates, 0, this.endss_, this.stride);\n  }\n\n  /**\n   * @return {Array<Array<number>>} Endss.\n   */\n  getEndss() {\n    return this.endss_;\n  }\n\n  /**\n   * @return {Array<number>} Flat interior points.\n   */\n  getFlatInteriorPoints() {\n    if (this.flatInteriorPointsRevision_ != this.getRevision()) {\n      const flatCenters = linearRingssCenter(\n        this.flatCoordinates, 0, this.endss_, this.stride);\n      this.flatInteriorPoints_ = getInteriorPointsOfMultiArray(\n        this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride,\n        flatCenters);\n      this.flatInteriorPointsRevision_ = this.getRevision();\n    }\n    return this.flatInteriorPoints_;\n  }\n\n  /**\n   * Return the interior points as {@link module:ol/geom/MultiPoint multipoint}.\n   * @return {MultiPoint} Interior points as XYM coordinates, where M is\n   * the length of the horizontal intersection that the point belongs to.\n   * @api\n   */\n  getInteriorPoints() {\n    return new MultiPoint(this.getFlatInteriorPoints().slice(), GeometryLayout.XYM);\n  }\n\n  /**\n   * @return {Array<number>} Oriented flat coordinates.\n   */\n  getOrientedFlatCoordinates() {\n    if (this.orientedRevision_ != this.getRevision()) {\n      const flatCoordinates = this.flatCoordinates;\n      if (linearRingsAreOriented(\n        flatCoordinates, 0, this.endss_, this.stride)) {\n        this.orientedFlatCoordinates_ = flatCoordinates;\n      } else {\n        this.orientedFlatCoordinates_ = flatCoordinates.slice();\n        this.orientedFlatCoordinates_.length =\n            orientLinearRingsArray(\n              this.orientedFlatCoordinates_, 0, this.endss_, this.stride);\n      }\n      this.orientedRevision_ = this.getRevision();\n    }\n    return this.orientedFlatCoordinates_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getSimplifiedGeometryInternal(squaredTolerance) {\n    const simplifiedFlatCoordinates = [];\n    const simplifiedEndss = [];\n    simplifiedFlatCoordinates.length = quantizeMultiArray(\n      this.flatCoordinates, 0, this.endss_, this.stride,\n      Math.sqrt(squaredTolerance),\n      simplifiedFlatCoordinates, 0, simplifiedEndss);\n    return new MultiPolygon(simplifiedFlatCoordinates, GeometryLayout.XY, simplifiedEndss);\n  }\n\n  /**\n   * Return the polygon at the specified index.\n   * @param {number} index Index.\n   * @return {Polygon} Polygon.\n   * @api\n   */\n  getPolygon(index) {\n    if (index < 0 || this.endss_.length <= index) {\n      return null;\n    }\n    let offset;\n    if (index === 0) {\n      offset = 0;\n    } else {\n      const prevEnds = this.endss_[index - 1];\n      offset = prevEnds[prevEnds.length - 1];\n    }\n    const ends = this.endss_[index].slice();\n    const end = ends[ends.length - 1];\n    if (offset !== 0) {\n      for (let i = 0, ii = ends.length; i < ii; ++i) {\n        ends[i] -= offset;\n      }\n    }\n    return new Polygon(this.flatCoordinates.slice(offset, end), this.layout, ends);\n  }\n\n  /**\n   * Return the polygons of this multipolygon.\n   * @return {Array<Polygon>} Polygons.\n   * @api\n   */\n  getPolygons() {\n    const layout = this.layout;\n    const flatCoordinates = this.flatCoordinates;\n    const endss = this.endss_;\n    const polygons = [];\n    let offset = 0;\n    for (let i = 0, ii = endss.length; i < ii; ++i) {\n      const ends = endss[i].slice();\n      const end = ends[ends.length - 1];\n      if (offset !== 0) {\n        for (let j = 0, jj = ends.length; j < jj; ++j) {\n          ends[j] -= offset;\n        }\n      }\n      const polygon = new Polygon(flatCoordinates.slice(offset, end), layout, ends);\n      polygons.push(polygon);\n      offset = end;\n    }\n    return polygons;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getType() {\n    return GeometryType.MULTI_POLYGON;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  intersectsExtent(extent) {\n    return intersectsLinearRingMultiArray(\n      this.getOrientedFlatCoordinates(), 0, this.endss_, this.stride, extent);\n  }\n\n  /**\n   * Set the coordinates of the multipolygon.\n   * @param {!Array<Array<Array<import(\"../coordinate.js\").Coordinate>>>} coordinates Coordinates.\n   * @param {GeometryLayout=} opt_layout Layout.\n   * @override\n   * @api\n   */\n  setCoordinates(coordinates, opt_layout) {\n    this.setLayout(opt_layout, coordinates, 3);\n    if (!this.flatCoordinates) {\n      this.flatCoordinates = [];\n    }\n    const endss = deflateMultiCoordinatesArray(\n      this.flatCoordinates, 0, coordinates, this.stride, this.endss_);\n    if (endss.length === 0) {\n      this.flatCoordinates.length = 0;\n    } else {\n      const lastEnds = endss[endss.length - 1];\n      this.flatCoordinates.length = lastEnds.length === 0 ?\n        0 : lastEnds[lastEnds.length - 1];\n    }\n    this.changed();\n  }\n}\n\n\nexport default MultiPolygon;\n","/**\n * @module ol/LayerType\n */\n\n/**\n * A layer type used when creating layer renderers.\n * @enum {string}\n */\nexport default {\n  IMAGE: 'IMAGE',\n  TILE: 'TILE',\n  VECTOR_TILE: 'VECTOR_TILE',\n  VECTOR: 'VECTOR'\n};\n","/**\n * @module ol/layer/VectorRenderType\n */\n\n/**\n * @enum {string}\n * Render mode for vector layers:\n *  * `'image'`: Vector layers are rendered as images. Great performance, but\n *    point symbols and texts are always rotated with the view and pixels are\n *    scaled during zoom animations.\n *  * `'vector'`: Vector layers are rendered as vectors. Most accurate rendering\n *    even during animations, but slower performance.\n * @api\n */\nexport default {\n  IMAGE: 'image',\n  VECTOR: 'vector'\n};\n","/**\n * @module ol/color\n */\nimport {assert} from './asserts.js';\nimport {clamp} from './math.js';\n\n\n/**\n * A color represented as a short array [red, green, blue, alpha].\n * red, green, and blue should be integers in the range 0..255 inclusive.\n * alpha should be a float in the range 0..1 inclusive. If no alpha value is\n * given then `1` will be used.\n * @typedef {Array<number>} Color\n * @api\n */\n\n\n/**\n * This RegExp matches # followed by 3, 4, 6, or 8 hex digits.\n * @const\n * @type {RegExp}\n * @private\n */\nconst HEX_COLOR_RE_ = /^#([a-f0-9]{3}|[a-f0-9]{4}(?:[a-f0-9]{2}){0,2})$/i;\n\n\n/**\n * Regular expression for matching potential named color style strings.\n * @const\n * @type {RegExp}\n * @private\n */\nconst NAMED_COLOR_RE_ = /^([a-z]*)$/i;\n\n\n/**\n * Return the color as an rgba string.\n * @param {Color|string} color Color.\n * @return {string} Rgba string.\n * @api\n */\nexport function asString(color) {\n  if (typeof color === 'string') {\n    return color;\n  } else {\n    return toString(color);\n  }\n}\n\n/**\n * Return named color as an rgba string.\n * @param {string} color Named color.\n * @return {string} Rgb string.\n */\nfunction fromNamed(color) {\n  const el = document.createElement('div');\n  el.style.color = color;\n  if (el.style.color !== '') {\n    document.body.appendChild(el);\n    const rgb = getComputedStyle(el).color;\n    document.body.removeChild(el);\n    return rgb;\n  } else {\n    return '';\n  }\n}\n\n\n/**\n * @param {string} s String.\n * @return {Color} Color.\n */\nexport const fromString = (\n  function() {\n\n    // We maintain a small cache of parsed strings.  To provide cheap LRU-like\n    // semantics, whenever the cache grows too large we simply delete an\n    // arbitrary 25% of the entries.\n\n    /**\n     * @const\n     * @type {number}\n     */\n    const MAX_CACHE_SIZE = 1024;\n\n    /**\n     * @type {Object<string, Color>}\n     */\n    const cache = {};\n\n    /**\n     * @type {number}\n     */\n    let cacheSize = 0;\n\n    return (\n      /**\n       * @param {string} s String.\n       * @return {Color} Color.\n       */\n      function(s) {\n        let color;\n        if (cache.hasOwnProperty(s)) {\n          color = cache[s];\n        } else {\n          if (cacheSize >= MAX_CACHE_SIZE) {\n            let i = 0;\n            for (const key in cache) {\n              if ((i++ & 3) === 0) {\n                delete cache[key];\n                --cacheSize;\n              }\n            }\n          }\n          color = fromStringInternal_(s);\n          cache[s] = color;\n          ++cacheSize;\n        }\n        return color;\n      }\n    );\n\n  })();\n\n/**\n * Return the color as an array. This function maintains a cache of calculated\n * arrays which means the result should not be modified.\n * @param {Color|string} color Color.\n * @return {Color} Color.\n * @api\n */\nexport function asArray(color) {\n  if (Array.isArray(color)) {\n    return color;\n  } else {\n    return fromString(color);\n  }\n}\n\n/**\n * @param {string} s String.\n * @private\n * @return {Color} Color.\n */\nfunction fromStringInternal_(s) {\n  let r, g, b, a, color;\n\n  if (NAMED_COLOR_RE_.exec(s)) {\n    s = fromNamed(s);\n  }\n\n  if (HEX_COLOR_RE_.exec(s)) { // hex\n    const n = s.length - 1; // number of hex digits\n    let d; // number of digits per channel\n    if (n <= 4) {\n      d = 1;\n    } else {\n      d = 2;\n    }\n    const hasAlpha = n === 4 || n === 8;\n    r = parseInt(s.substr(1 + 0 * d, d), 16);\n    g = parseInt(s.substr(1 + 1 * d, d), 16);\n    b = parseInt(s.substr(1 + 2 * d, d), 16);\n    if (hasAlpha) {\n      a = parseInt(s.substr(1 + 3 * d, d), 16);\n    } else {\n      a = 255;\n    }\n    if (d == 1) {\n      r = (r << 4) + r;\n      g = (g << 4) + g;\n      b = (b << 4) + b;\n      if (hasAlpha) {\n        a = (a << 4) + a;\n      }\n    }\n    color = [r, g, b, a / 255];\n  } else if (s.indexOf('rgba(') == 0) { // rgba()\n    color = s.slice(5, -1).split(',').map(Number);\n    normalize(color);\n  } else if (s.indexOf('rgb(') == 0) { // rgb()\n    color = s.slice(4, -1).split(',').map(Number);\n    color.push(1);\n    normalize(color);\n  } else {\n    assert(false, 14); // Invalid color\n  }\n  return color;\n}\n\n\n/**\n * TODO this function is only used in the test, we probably shouldn't export it\n * @param {Color} color Color.\n * @return {Color} Clamped color.\n */\nexport function normalize(color) {\n  color[0] = clamp((color[0] + 0.5) | 0, 0, 255);\n  color[1] = clamp((color[1] + 0.5) | 0, 0, 255);\n  color[2] = clamp((color[2] + 0.5) | 0, 0, 255);\n  color[3] = clamp(color[3], 0, 1);\n  return color;\n}\n\n\n/**\n * @param {Color} color Color.\n * @return {string} String.\n */\nexport function toString(color) {\n  let r = color[0];\n  if (r != (r | 0)) {\n    r = (r + 0.5) | 0;\n  }\n  let g = color[1];\n  if (g != (g | 0)) {\n    g = (g + 0.5) | 0;\n  }\n  let b = color[2];\n  if (b != (b | 0)) {\n    b = (b + 0.5) | 0;\n  }\n  const a = color[3] === undefined ? 1 : color[3];\n  return 'rgba(' + r + ',' + g + ',' + b + ',' + a + ')';\n}\n","/**\n * @module ol/colorlike\n */\nimport {toString} from './color.js';\n\n\n/**\n * A type accepted by CanvasRenderingContext2D.fillStyle\n * or CanvasRenderingContext2D.strokeStyle.\n * Represents a color, pattern, or gradient. The origin for patterns and\n * gradients as fill style is an increment of 512 css pixels from map coordinate\n * `[0, 0]`. For seamless repeat patterns, width and height of the pattern image\n * must be a factor of two (2, 4, 8, ..., 512).\n *\n * @typedef {string|CanvasPattern|CanvasGradient} ColorLike\n * @api\n */\n\n\n/**\n * @param {import(\"./color.js\").Color|ColorLike} color Color.\n * @return {ColorLike} The color as an {@link ol/colorlike~ColorLike}.\n * @api\n */\nexport function asColorLike(color) {\n  if (Array.isArray(color)) {\n    return toString(color);\n  } else {\n    return color;\n  }\n}\n","/**\n * @module ol/ImageState\n */\n\n/**\n * @enum {number}\n */\nexport default {\n  IDLE: 0,\n  LOADING: 1,\n  LOADED: 2,\n  ERROR: 3\n};\n","/**\n * @module ol/structs/LRUCache\n */\n\nimport {assert} from '../asserts.js';\nimport EventTarget from '../events/Target.js';\nimport EventType from '../events/EventType.js';\n\n\n/**\n * @typedef {Object} Entry\n * @property {string} key_\n * @property {Object} newer\n * @property {Object} older\n * @property {*} value_\n */\n\n\n/**\n * @classdesc\n * Implements a Least-Recently-Used cache where the keys do not conflict with\n * Object's properties (e.g. 'hasOwnProperty' is not allowed as a key). Expiring\n * items from the cache is the responsibility of the user.\n *\n * @fires import(\"../events/Event.js\").Event\n * @template T\n */\nclass LRUCache extends EventTarget {\n\n  /**\n   * @param {number=} opt_highWaterMark High water mark.\n   */\n  constructor(opt_highWaterMark) {\n\n    super();\n\n    /**\n     * @type {number}\n     */\n    this.highWaterMark = opt_highWaterMark !== undefined ? opt_highWaterMark : 2048;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.count_ = 0;\n\n    /**\n     * @private\n     * @type {!Object<string, Entry>}\n     */\n    this.entries_ = {};\n\n    /**\n     * @private\n     * @type {?Entry}\n     */\n    this.oldest_ = null;\n\n    /**\n     * @private\n     * @type {?Entry}\n     */\n    this.newest_ = null;\n\n  }\n\n\n  /**\n   * @return {boolean} Can expire cache.\n   */\n  canExpireCache() {\n    return this.getCount() > this.highWaterMark;\n  }\n\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  clear() {\n    this.count_ = 0;\n    this.entries_ = {};\n    this.oldest_ = null;\n    this.newest_ = null;\n    this.dispatchEvent(EventType.CLEAR);\n  }\n\n\n  /**\n   * @param {string} key Key.\n   * @return {boolean} Contains key.\n   */\n  containsKey(key) {\n    return this.entries_.hasOwnProperty(key);\n  }\n\n\n  /**\n   * @param {function(this: S, T, string, LRUCache): ?} f The function\n   *     to call for every entry from the oldest to the newer. This function takes\n   *     3 arguments (the entry value, the entry key and the LRUCache object).\n   *     The return value is ignored.\n   * @param {S=} opt_this The object to use as `this` in `f`.\n   * @template S\n   */\n  forEach(f, opt_this) {\n    let entry = this.oldest_;\n    while (entry) {\n      f.call(opt_this, entry.value_, entry.key_, this);\n      entry = entry.newer;\n    }\n  }\n\n\n  /**\n   * @param {string} key Key.\n   * @return {T} Value.\n   */\n  get(key) {\n    const entry = this.entries_[key];\n    assert(entry !== undefined,\n      15); // Tried to get a value for a key that does not exist in the cache\n    if (entry === this.newest_) {\n      return entry.value_;\n    } else if (entry === this.oldest_) {\n      this.oldest_ = /** @type {Entry} */ (this.oldest_.newer);\n      this.oldest_.older = null;\n    } else {\n      entry.newer.older = entry.older;\n      entry.older.newer = entry.newer;\n    }\n    entry.newer = null;\n    entry.older = this.newest_;\n    this.newest_.newer = entry;\n    this.newest_ = entry;\n    return entry.value_;\n  }\n\n\n  /**\n   * Remove an entry from the cache.\n   * @param {string} key The entry key.\n   * @return {T} The removed entry.\n   */\n  remove(key) {\n    const entry = this.entries_[key];\n    assert(entry !== undefined, 15); // Tried to get a value for a key that does not exist in the cache\n    if (entry === this.newest_) {\n      this.newest_ = /** @type {Entry} */ (entry.older);\n      if (this.newest_) {\n        this.newest_.newer = null;\n      }\n    } else if (entry === this.oldest_) {\n      this.oldest_ = /** @type {Entry} */ (entry.newer);\n      if (this.oldest_) {\n        this.oldest_.older = null;\n      }\n    } else {\n      entry.newer.older = entry.older;\n      entry.older.newer = entry.newer;\n    }\n    delete this.entries_[key];\n    --this.count_;\n    return entry.value_;\n  }\n\n\n  /**\n   * @return {number} Count.\n   */\n  getCount() {\n    return this.count_;\n  }\n\n\n  /**\n   * @return {Array<string>} Keys.\n   */\n  getKeys() {\n    const keys = new Array(this.count_);\n    let i = 0;\n    let entry;\n    for (entry = this.newest_; entry; entry = entry.older) {\n      keys[i++] = entry.key_;\n    }\n    return keys;\n  }\n\n\n  /**\n   * @return {Array<T>} Values.\n   */\n  getValues() {\n    const values = new Array(this.count_);\n    let i = 0;\n    let entry;\n    for (entry = this.newest_; entry; entry = entry.older) {\n      values[i++] = entry.value_;\n    }\n    return values;\n  }\n\n\n  /**\n   * @return {T} Last value.\n   */\n  peekLast() {\n    return this.oldest_.value_;\n  }\n\n\n  /**\n   * @return {string} Last key.\n   */\n  peekLastKey() {\n    return this.oldest_.key_;\n  }\n\n\n  /**\n   * Get the key of the newest item in the cache.  Throws if the cache is empty.\n   * @return {string} The newest key.\n   */\n  peekFirstKey() {\n    return this.newest_.key_;\n  }\n\n\n  /**\n   * @return {T} value Value.\n   */\n  pop() {\n    const entry = this.oldest_;\n    delete this.entries_[entry.key_];\n    if (entry.newer) {\n      entry.newer.older = null;\n    }\n    this.oldest_ = /** @type {Entry} */ (entry.newer);\n    if (!this.oldest_) {\n      this.newest_ = null;\n    }\n    --this.count_;\n    return entry.value_;\n  }\n\n\n  /**\n   * @param {string} key Key.\n   * @param {T} value Value.\n   */\n  replace(key, value) {\n    this.get(key); // update `newest_`\n    this.entries_[key].value_ = value;\n  }\n\n\n  /**\n   * @param {string} key Key.\n   * @param {T} value Value.\n   */\n  set(key, value) {\n    assert(!(key in this.entries_),\n      16); // Tried to set a value for a key that is used already\n    const entry = /** @type {Entry} */ ({\n      key_: key,\n      newer: null,\n      older: this.newest_,\n      value_: value\n    });\n    if (!this.newest_) {\n      this.oldest_ = entry;\n    } else {\n      this.newest_.newer = entry;\n    }\n    this.newest_ = entry;\n    this.entries_[key] = entry;\n    ++this.count_;\n  }\n\n\n  /**\n   * Set a maximum number of entries for the cache.\n   * @param {number} size Cache size.\n   * @api\n   */\n  setSize(size) {\n    this.highWaterMark = size;\n  }\n\n\n  /**\n   * Prune the cache.\n   */\n  prune() {\n    while (this.canExpireCache()) {\n      this.pop();\n    }\n  }\n\n}\n\nexport default LRUCache;\n","/**\n * @module ol/render/canvas\n */\nimport {getFontFamilies} from '../css.js';\nimport {createCanvasContext2D} from '../dom.js';\nimport {clear} from '../obj.js';\nimport LRUCache from '../structs/LRUCache.js';\nimport {create as createTransform} from '../transform.js';\n\n\n/**\n * @typedef {Object} FillState\n * @property {import(\"../colorlike.js\").ColorLike} fillStyle\n */\n\n\n/**\n * @typedef {Object} FillStrokeState\n * @property {import(\"../colorlike.js\").ColorLike} [currentFillStyle]\n * @property {import(\"../colorlike.js\").ColorLike} [currentStrokeStyle]\n * @property {string} [currentLineCap]\n * @property {Array<number>} currentLineDash\n * @property {number} [currentLineDashOffset]\n * @property {string} [currentLineJoin]\n * @property {number} [currentLineWidth]\n * @property {number} [currentMiterLimit]\n * @property {number} [lastStroke]\n * @property {import(\"../colorlike.js\").ColorLike} [fillStyle]\n * @property {import(\"../colorlike.js\").ColorLike} [strokeStyle]\n * @property {string} [lineCap]\n * @property {Array<number>} lineDash\n * @property {number} [lineDashOffset]\n * @property {string} [lineJoin]\n * @property {number} [lineWidth]\n * @property {number} [miterLimit]\n */\n\n\n/**\n * @typedef {Object} StrokeState\n * @property {string} lineCap\n * @property {Array<number>} lineDash\n * @property {number} lineDashOffset\n * @property {string} lineJoin\n * @property {number} lineWidth\n * @property {number} miterLimit\n * @property {import(\"../colorlike.js\").ColorLike} strokeStyle\n */\n\n\n/**\n * @typedef {Object} TextState\n * @property {string} font\n * @property {string} [textAlign]\n * @property {string} textBaseline\n * @property {string} [placement]\n * @property {number} [maxAngle]\n * @property {boolean} [overflow]\n * @property {import(\"../style/Fill.js\").default} [backgroundFill]\n * @property {import(\"../style/Stroke.js\").default} [backgroundStroke]\n * @property {number} [scale]\n * @property {Array<number>} [padding]\n */\n\n\n/**\n * Container for decluttered replay instructions that need to be rendered or\n * omitted together, i.e. when styles render both an image and text, or for the\n * characters that form text along lines. The basic elements of this array are\n * `[minX, minY, maxX, maxY, count]`, where the first four entries are the\n * rendered extent of the group in pixel space. `count` is the number of styles\n * in the group, i.e. 2 when an image and a text are grouped, or 1 otherwise.\n * In addition to these four elements, declutter instruction arrays (i.e. the\n * arguments to {@link module:ol/render/canvas~drawImage} are appended to the array.\n * @typedef {Array<*>} DeclutterGroup\n */\n\n\n/**\n * @const\n * @type {string}\n */\nexport const defaultFont = '10px sans-serif';\n\n\n/**\n * @const\n * @type {import(\"../color.js\").Color}\n */\nexport const defaultFillStyle = [0, 0, 0, 1];\n\n\n/**\n * @const\n * @type {string}\n */\nexport const defaultLineCap = 'round';\n\n\n/**\n * @const\n * @type {Array<number>}\n */\nexport const defaultLineDash = [];\n\n\n/**\n * @const\n * @type {number}\n */\nexport const defaultLineDashOffset = 0;\n\n\n/**\n * @const\n * @type {string}\n */\nexport const defaultLineJoin = 'round';\n\n\n/**\n * @const\n * @type {number}\n */\nexport const defaultMiterLimit = 10;\n\n\n/**\n * @const\n * @type {import(\"../color.js\").Color}\n */\nexport const defaultStrokeStyle = [0, 0, 0, 1];\n\n\n/**\n * @const\n * @type {string}\n */\nexport const defaultTextAlign = 'center';\n\n\n/**\n * @const\n * @type {string}\n */\nexport const defaultTextBaseline = 'middle';\n\n\n/**\n * @const\n * @type {Array<number>}\n */\nexport const defaultPadding = [0, 0, 0, 0];\n\n\n/**\n * @const\n * @type {number}\n */\nexport const defaultLineWidth = 1;\n\n\n/**\n * The label cache for text rendering. To change the default cache size of 2048\n * entries, use {@link module:ol/structs/LRUCache#setSize}.\n * @type {LRUCache<HTMLCanvasElement>}\n * @api\n */\nexport const labelCache = new LRUCache();\n\n\n/**\n * @type {!Object<string, number>}\n */\nexport const checkedFonts = {};\n\n\n/**\n * @type {CanvasRenderingContext2D}\n */\nlet measureContext = null;\n\n\n/**\n * @type {!Object<string, number>}\n */\nexport const textHeights = {};\n\n\n/**\n * Clears the label cache when a font becomes available.\n * @param {string} fontSpec CSS font spec.\n */\nexport const checkFont = (function() {\n  const retries = 60;\n  const checked = checkedFonts;\n  const size = '32px ';\n  const referenceFonts = ['monospace', 'serif'];\n  const len = referenceFonts.length;\n  const text = 'wmytzilWMYTZIL@#/&?$%10\\uF013';\n  let interval, referenceWidth;\n\n  function isAvailable(font) {\n    const context = getMeasureContext();\n    // Check weight ranges according to\n    // https://developer.mozilla.org/en-US/docs/Web/CSS/font-weight#Fallback_weights\n    for (let weight = 100; weight <= 700; weight += 300) {\n      const fontWeight = weight + ' ';\n      let available = true;\n      for (let i = 0; i < len; ++i) {\n        const referenceFont = referenceFonts[i];\n        context.font = fontWeight + size + referenceFont;\n        referenceWidth = context.measureText(text).width;\n        if (font != referenceFont) {\n          context.font = fontWeight + size + font + ',' + referenceFont;\n          const width = context.measureText(text).width;\n          // If width and referenceWidth are the same, then the fallback was used\n          // instead of the font we wanted, so the font is not available.\n          available = available && width != referenceWidth;\n        }\n      }\n      if (available) {\n        // Consider font available when it is available in one weight range.\n        //FIXME With this we miss rare corner cases, so we should consider\n        //FIXME checking availability for each requested weight range.\n        return true;\n      }\n    }\n    return false;\n  }\n\n  function check() {\n    let done = true;\n    for (const font in checked) {\n      if (checked[font] < retries) {\n        if (isAvailable(font)) {\n          checked[font] = retries;\n          clear(textHeights);\n          // Make sure that loaded fonts are picked up by Safari\n          measureContext = null;\n          labelCache.clear();\n        } else {\n          ++checked[font];\n          done = false;\n        }\n      }\n    }\n    if (done) {\n      clearInterval(interval);\n      interval = undefined;\n    }\n  }\n\n  return function(fontSpec) {\n    const fontFamilies = getFontFamilies(fontSpec);\n    if (!fontFamilies) {\n      return;\n    }\n    for (let i = 0, ii = fontFamilies.length; i < ii; ++i) {\n      const fontFamily = fontFamilies[i];\n      if (!(fontFamily in checked)) {\n        checked[fontFamily] = retries;\n        if (!isAvailable(fontFamily)) {\n          checked[fontFamily] = 0;\n          if (interval === undefined) {\n            interval = setInterval(check, 32);\n          }\n        }\n      }\n    }\n  };\n})();\n\n\n/**\n * @return {CanvasRenderingContext2D} Measure context.\n */\nfunction getMeasureContext() {\n  if (!measureContext) {\n    measureContext = createCanvasContext2D(1, 1);\n  }\n  return measureContext;\n}\n\n\n/**\n * @param {string} font Font to use for measuring.\n * @return {import(\"../size.js\").Size} Measurement.\n */\nexport const measureTextHeight = (function() {\n  let span;\n  const heights = textHeights;\n  return function(font) {\n    let height = heights[font];\n    if (height == undefined) {\n      if (!span) {\n        span = document.createElement('span');\n        span.textContent = 'M';\n        span.style.margin = span.style.padding = '0 !important';\n        span.style.position = 'absolute !important';\n        span.style.left = '-99999px !important';\n      }\n      span.style.font = font;\n      document.body.appendChild(span);\n      height = heights[font] = span.offsetHeight;\n      document.body.removeChild(span);\n    }\n    return height;\n  };\n})();\n\n\n/**\n * @param {string} font Font.\n * @param {string} text Text.\n * @return {number} Width.\n */\nexport function measureTextWidth(font, text) {\n  const measureContext = getMeasureContext();\n  if (font != measureContext.font) {\n    measureContext.font = font;\n  }\n  return measureContext.measureText(text).width;\n}\n\n\n/**\n * @param {CanvasRenderingContext2D} context Context.\n * @param {number} rotation Rotation.\n * @param {number} offsetX X offset.\n * @param {number} offsetY Y offset.\n */\nexport function rotateAtOffset(context, rotation, offsetX, offsetY) {\n  if (rotation !== 0) {\n    context.translate(offsetX, offsetY);\n    context.rotate(rotation);\n    context.translate(-offsetX, -offsetY);\n  }\n}\n\n\nexport const resetTransform = createTransform();\n\n\n/**\n * @param {CanvasRenderingContext2D} context Context.\n * @param {import(\"../transform.js\").Transform|null} transform Transform.\n * @param {number} opacity Opacity.\n * @param {HTMLImageElement|HTMLCanvasElement|HTMLVideoElement} image Image.\n * @param {number} originX Origin X.\n * @param {number} originY Origin Y.\n * @param {number} w Width.\n * @param {number} h Height.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {number} scale Scale.\n */\nexport function drawImage(context,\n  transform, opacity, image, originX, originY, w, h, x, y, scale) {\n  let alpha;\n  if (opacity != 1) {\n    alpha = context.globalAlpha;\n    context.globalAlpha = alpha * opacity;\n  }\n  if (transform) {\n    context.setTransform.apply(context, transform);\n  }\n\n  context.drawImage(image, originX, originY, w, h, x, y, w * scale, h * scale);\n\n  if (alpha) {\n    context.globalAlpha = alpha;\n  }\n  if (transform) {\n    context.setTransform.apply(context, resetTransform);\n  }\n}\n","/**\n * @module ol/style/Image\n */\nimport {abstract} from '../util.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} opacity\n * @property {boolean} rotateWithView\n * @property {number} rotation\n * @property {number} scale\n */\n\n\n/**\n * @classdesc\n * A base class used for creating subclasses and not instantiated in\n * apps. Base class for {@link module:ol/style/Icon~Icon}, {@link module:ol/style/Circle~CircleStyle} and\n * {@link module:ol/style/RegularShape~RegularShape}.\n * @abstract\n * @api\n */\nclass ImageStyle {\n  /**\n   * @param {Options} options Options.\n   */\n  constructor(options) {\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.opacity_ = options.opacity;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.rotateWithView_ = options.rotateWithView;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.rotation_ = options.rotation;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.scale_ = options.scale;\n\n  }\n\n  /**\n   * Clones the style.\n   * @return {ImageStyle} The cloned style.\n   * @api\n   */\n  clone() {\n    return new ImageStyle({\n      opacity: this.getOpacity(),\n      scale: this.getScale(),\n      rotation: this.getRotation(),\n      rotateWithView: this.getRotateWithView()\n    });\n  }\n\n  /**\n   * Get the symbolizer opacity.\n   * @return {number} Opacity.\n   * @api\n   */\n  getOpacity() {\n    return this.opacity_;\n  }\n\n  /**\n   * Determine whether the symbolizer rotates with the map.\n   * @return {boolean} Rotate with map.\n   * @api\n   */\n  getRotateWithView() {\n    return this.rotateWithView_;\n  }\n\n  /**\n   * Get the symoblizer rotation.\n   * @return {number} Rotation.\n   * @api\n   */\n  getRotation() {\n    return this.rotation_;\n  }\n\n  /**\n   * Get the symbolizer scale.\n   * @return {number} Scale.\n   * @api\n   */\n  getScale() {\n    return this.scale_;\n  }\n\n  /**\n   * This method is deprecated and always returns false.\n   * @return {boolean} false.\n   * @deprecated\n   * @api\n   */\n  getSnapToPixel() {\n    return false;\n  }\n\n  /**\n   * Get the anchor point in pixels. The anchor determines the center point for the\n   * symbolizer.\n   * @abstract\n   * @return {Array<number>} Anchor.\n   */\n  getAnchor() {\n    return abstract();\n  }\n\n  /**\n   * Get the image element for the symbolizer.\n   * @abstract\n   * @param {number} pixelRatio Pixel ratio.\n   * @return {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} Image element.\n   */\n  getImage(pixelRatio) {\n    return abstract();\n  }\n\n  /**\n   * @abstract\n   * @param {number} pixelRatio Pixel ratio.\n   * @return {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} Image element.\n   */\n  getHitDetectionImage(pixelRatio) {\n    return abstract();\n  }\n\n  /**\n   * @abstract\n   * @return {import(\"../ImageState.js\").default} Image state.\n   */\n  getImageState() {\n    return abstract();\n  }\n\n  /**\n   * @abstract\n   * @return {import(\"../size.js\").Size} Image size.\n   */\n  getImageSize() {\n    return abstract();\n  }\n\n  /**\n   * @abstract\n   * @return {import(\"../size.js\").Size} Size of the hit-detection image.\n   */\n  getHitDetectionImageSize() {\n    return abstract();\n  }\n\n  /**\n   * Get the origin of the symbolizer.\n   * @abstract\n   * @return {Array<number>} Origin.\n   */\n  getOrigin() {\n    return abstract();\n  }\n\n  /**\n   * Get the size of the symbolizer (in pixels).\n   * @abstract\n   * @return {import(\"../size.js\").Size} Size.\n   */\n  getSize() {\n    return abstract();\n  }\n\n  /**\n   * Set the opacity.\n   *\n   * @param {number} opacity Opacity.\n   * @api\n   */\n  setOpacity(opacity) {\n    this.opacity_ = opacity;\n  }\n\n  /**\n   * Set whether to rotate the style with the view.\n   *\n   * @param {boolean} rotateWithView Rotate with map.\n   * @api\n   */\n  setRotateWithView(rotateWithView) {\n    this.rotateWithView_ = rotateWithView;\n  }\n\n  /**\n   * Set the rotation.\n   *\n   * @param {number} rotation Rotation.\n   * @api\n   */\n  setRotation(rotation) {\n    this.rotation_ = rotation;\n  }\n  /**\n   * Set the scale.\n   *\n   * @param {number} scale Scale.\n   * @api\n   */\n  setScale(scale) {\n    this.scale_ = scale;\n  }\n\n  /**\n   * This method is deprecated and does nothing.\n   * @param {boolean} snapToPixel Snap to pixel?\n   * @deprecated\n   * @api\n   */\n  setSnapToPixel(snapToPixel) {}\n\n  /**\n   * @abstract\n   * @param {function(this: T, import(\"../events/Event.js\").default)} listener Listener function.\n   * @param {T} thisArg Value to use as `this` when executing `listener`.\n   * @return {import(\"../events.js\").EventsKey|undefined} Listener key.\n   * @template T\n   */\n  listenImageChange(listener, thisArg) {\n    return abstract();\n  }\n\n  /**\n   * Load not yet loaded URI.\n   * @abstract\n   */\n  load() {\n    abstract();\n  }\n\n  /**\n   * @abstract\n   * @param {function(this: T, import(\"../events/Event.js\").default)} listener Listener function.\n   * @param {T} thisArg Value to use as `this` when executing `listener`.\n   * @template T\n   */\n  unlistenImageChange(listener, thisArg) {\n    abstract();\n  }\n}\n\nexport default ImageStyle;\n","/**\n * @module ol/style/RegularShape\n */\n\nimport {asString} from '../color.js';\nimport {asColorLike} from '../colorlike.js';\nimport {createCanvasContext2D} from '../dom.js';\nimport {CANVAS_LINE_DASH} from '../has.js';\nimport ImageState from '../ImageState.js';\nimport {defaultStrokeStyle, defaultFillStyle, defaultLineCap, defaultLineWidth, defaultLineJoin, defaultMiterLimit} from '../render/canvas.js';\nimport ImageStyle from './Image.js';\n\n\n/**\n * Specify radius for regular polygons, or radius1 and radius2 for stars.\n * @typedef {Object} Options\n * @property {import(\"./Fill.js\").default} [fill] Fill style.\n * @property {number} points Number of points for stars and regular polygons. In case of a polygon, the number of points\n * is the number of sides.\n * @property {number} [radius] Radius of a regular polygon.\n * @property {number} [radius1] Outer radius of a star.\n * @property {number} [radius2] Inner radius of a star.\n * @property {number} [angle=0] Shape's angle in radians. A value of 0 will have one of the shape's point facing up.\n * @property {import(\"./Stroke.js\").default} [stroke] Stroke style.\n * @property {number} [rotation=0] Rotation in radians (positive rotation clockwise).\n * @property {boolean} [rotateWithView=false] Whether to rotate the shape with the view.\n * @property {import(\"./AtlasManager.js\").default} [atlasManager] The atlas manager to use for this symbol. When\n * using WebGL it is recommended to use an atlas manager to avoid texture switching. If an atlas manager is given, the\n * symbol is added to an atlas. By default no atlas manager is used.\n */\n\n\n/**\n * @typedef {Object} RenderOptions\n * @property {import(\"../colorlike.js\").ColorLike} [strokeStyle]\n * @property {number} strokeWidth\n * @property {number} size\n * @property {string} lineCap\n * @property {Array<number>} lineDash\n * @property {number} lineDashOffset\n * @property {string} lineJoin\n * @property {number} miterLimit\n */\n\n\n/**\n * @classdesc\n * Set regular shape style for vector features. The resulting shape will be\n * a regular polygon when `radius` is provided, or a star when `radius1` and\n * `radius2` are provided.\n * @api\n */\nclass RegularShape extends ImageStyle {\n  /**\n   * @param {Options} options Options.\n   */\n  constructor(options) {\n    /**\n     * @type {boolean}\n     */\n    const rotateWithView = options.rotateWithView !== undefined ?\n      options.rotateWithView : false;\n\n    super({\n      opacity: 1,\n      rotateWithView: rotateWithView,\n      rotation: options.rotation !== undefined ? options.rotation : 0,\n      scale: 1\n    });\n\n    /**\n     * @private\n     * @type {Array<string|number>}\n     */\n    this.checksums_ = null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.canvas_ = null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.hitDetectionCanvas_ = null;\n\n    /**\n     * @private\n     * @type {import(\"./Fill.js\").default}\n     */\n    this.fill_ = options.fill !== undefined ? options.fill : null;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.origin_ = [0, 0];\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.points_ = options.points;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.radius_ = /** @type {number} */ (options.radius !== undefined ?\n      options.radius : options.radius1);\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.radius2_ = options.radius2;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.angle_ = options.angle !== undefined ? options.angle : 0;\n\n    /**\n     * @private\n     * @type {import(\"./Stroke.js\").default}\n     */\n    this.stroke_ = options.stroke !== undefined ? options.stroke : null;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.anchor_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../size.js\").Size}\n     */\n    this.size_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../size.js\").Size}\n     */\n    this.imageSize_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../size.js\").Size}\n     */\n    this.hitDetectionImageSize_ = null;\n\n    /**\n     * @protected\n     * @type {import(\"./AtlasManager.js\").default|undefined}\n     */\n    this.atlasManager_ = options.atlasManager;\n\n    this.render_(this.atlasManager_);\n\n  }\n\n  /**\n   * Clones the style. If an atlasmanager was provided to the original style it will be used in the cloned style, too.\n   * @return {RegularShape} The cloned style.\n   * @api\n   */\n  clone() {\n    const style = new RegularShape({\n      fill: this.getFill() ? this.getFill().clone() : undefined,\n      points: this.getPoints(),\n      radius: this.getRadius(),\n      radius2: this.getRadius2(),\n      angle: this.getAngle(),\n      stroke: this.getStroke() ? this.getStroke().clone() : undefined,\n      rotation: this.getRotation(),\n      rotateWithView: this.getRotateWithView(),\n      atlasManager: this.atlasManager_\n    });\n    style.setOpacity(this.getOpacity());\n    style.setScale(this.getScale());\n    return style;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getAnchor() {\n    return this.anchor_;\n  }\n\n  /**\n   * Get the angle used in generating the shape.\n   * @return {number} Shape's rotation in radians.\n   * @api\n   */\n  getAngle() {\n    return this.angle_;\n  }\n\n  /**\n   * Get the fill style for the shape.\n   * @return {import(\"./Fill.js\").default} Fill style.\n   * @api\n   */\n  getFill() {\n    return this.fill_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getHitDetectionImage(pixelRatio) {\n    return this.hitDetectionCanvas_;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getImage(pixelRatio) {\n    return this.canvas_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImageSize() {\n    return this.imageSize_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getHitDetectionImageSize() {\n    return this.hitDetectionImageSize_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImageState() {\n    return ImageState.LOADED;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getOrigin() {\n    return this.origin_;\n  }\n\n  /**\n   * Get the number of points for generating the shape.\n   * @return {number} Number of points for stars and regular polygons.\n   * @api\n   */\n  getPoints() {\n    return this.points_;\n  }\n\n  /**\n   * Get the (primary) radius for the shape.\n   * @return {number} Radius.\n   * @api\n   */\n  getRadius() {\n    return this.radius_;\n  }\n\n  /**\n   * Get the secondary radius for the shape.\n   * @return {number|undefined} Radius2.\n   * @api\n   */\n  getRadius2() {\n    return this.radius2_;\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  getSize() {\n    return this.size_;\n  }\n\n  /**\n   * Get the stroke style for the shape.\n   * @return {import(\"./Stroke.js\").default} Stroke style.\n   * @api\n   */\n  getStroke() {\n    return this.stroke_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  listenImageChange(listener, thisArg) {\n    return undefined;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  load() {}\n\n  /**\n   * @inheritDoc\n   */\n  unlistenImageChange(listener, thisArg) {}\n\n  /**\n   * @protected\n   * @param {import(\"./AtlasManager.js\").default|undefined} atlasManager An atlas manager.\n   */\n  render_(atlasManager) {\n    let imageSize;\n    let lineCap = '';\n    let lineJoin = '';\n    let miterLimit = 0;\n    let lineDash = null;\n    let lineDashOffset = 0;\n    let strokeStyle;\n    let strokeWidth = 0;\n\n    if (this.stroke_) {\n      strokeStyle = this.stroke_.getColor();\n      if (strokeStyle === null) {\n        strokeStyle = defaultStrokeStyle;\n      }\n      strokeStyle = asColorLike(strokeStyle);\n      strokeWidth = this.stroke_.getWidth();\n      if (strokeWidth === undefined) {\n        strokeWidth = defaultLineWidth;\n      }\n      lineDash = this.stroke_.getLineDash();\n      lineDashOffset = this.stroke_.getLineDashOffset();\n      if (!CANVAS_LINE_DASH) {\n        lineDash = null;\n        lineDashOffset = 0;\n      }\n      lineJoin = this.stroke_.getLineJoin();\n      if (lineJoin === undefined) {\n        lineJoin = defaultLineJoin;\n      }\n      lineCap = this.stroke_.getLineCap();\n      if (lineCap === undefined) {\n        lineCap = defaultLineCap;\n      }\n      miterLimit = this.stroke_.getMiterLimit();\n      if (miterLimit === undefined) {\n        miterLimit = defaultMiterLimit;\n      }\n    }\n\n    let size = 2 * (this.radius_ + strokeWidth) + 1;\n\n    /** @type {RenderOptions} */\n    const renderOptions = {\n      strokeStyle: strokeStyle,\n      strokeWidth: strokeWidth,\n      size: size,\n      lineCap: lineCap,\n      lineDash: lineDash,\n      lineDashOffset: lineDashOffset,\n      lineJoin: lineJoin,\n      miterLimit: miterLimit\n    };\n\n    if (atlasManager === undefined) {\n      // no atlas manager is used, create a new canvas\n      const context = createCanvasContext2D(size, size);\n      this.canvas_ = context.canvas;\n\n      // canvas.width and height are rounded to the closest integer\n      size = this.canvas_.width;\n      imageSize = size;\n\n      this.draw_(renderOptions, context, 0, 0);\n\n      this.createHitDetectionCanvas_(renderOptions);\n    } else {\n      // an atlas manager is used, add the symbol to an atlas\n      size = Math.round(size);\n\n      const hasCustomHitDetectionImage = !this.fill_;\n      let renderHitDetectionCallback;\n      if (hasCustomHitDetectionImage) {\n        // render the hit-detection image into a separate atlas image\n        renderHitDetectionCallback =\n            this.drawHitDetectionCanvas_.bind(this, renderOptions);\n      }\n\n      const id = this.getChecksum();\n      const info = atlasManager.add(\n        id, size, size, this.draw_.bind(this, renderOptions),\n        renderHitDetectionCallback);\n\n      this.canvas_ = info.image;\n      this.origin_ = [info.offsetX, info.offsetY];\n      imageSize = info.image.width;\n\n      if (hasCustomHitDetectionImage) {\n        this.hitDetectionCanvas_ = info.hitImage;\n        this.hitDetectionImageSize_ =\n            [info.hitImage.width, info.hitImage.height];\n      } else {\n        this.hitDetectionCanvas_ = this.canvas_;\n        this.hitDetectionImageSize_ = [imageSize, imageSize];\n      }\n    }\n\n    this.anchor_ = [size / 2, size / 2];\n    this.size_ = [size, size];\n    this.imageSize_ = [imageSize, imageSize];\n  }\n\n  /**\n   * @private\n   * @param {RenderOptions} renderOptions Render options.\n   * @param {CanvasRenderingContext2D} context The rendering context.\n   * @param {number} x The origin for the symbol (x).\n   * @param {number} y The origin for the symbol (y).\n   */\n  draw_(renderOptions, context, x, y) {\n    let i, angle0, radiusC;\n    // reset transform\n    context.setTransform(1, 0, 0, 1, 0, 0);\n\n    // then move to (x, y)\n    context.translate(x, y);\n\n    context.beginPath();\n\n    let points = this.points_;\n    if (points === Infinity) {\n      context.arc(\n        renderOptions.size / 2, renderOptions.size / 2,\n        this.radius_, 0, 2 * Math.PI, true);\n    } else {\n      const radius2 = (this.radius2_ !== undefined) ? this.radius2_\n        : this.radius_;\n      if (radius2 !== this.radius_) {\n        points = 2 * points;\n      }\n      for (i = 0; i <= points; i++) {\n        angle0 = i * 2 * Math.PI / points - Math.PI / 2 + this.angle_;\n        radiusC = i % 2 === 0 ? this.radius_ : radius2;\n        context.lineTo(renderOptions.size / 2 + radiusC * Math.cos(angle0),\n          renderOptions.size / 2 + radiusC * Math.sin(angle0));\n      }\n    }\n\n\n    if (this.fill_) {\n      let color = this.fill_.getColor();\n      if (color === null) {\n        color = defaultFillStyle;\n      }\n      context.fillStyle = asColorLike(color);\n      context.fill();\n    }\n    if (this.stroke_) {\n      context.strokeStyle = renderOptions.strokeStyle;\n      context.lineWidth = renderOptions.strokeWidth;\n      if (renderOptions.lineDash) {\n        context.setLineDash(renderOptions.lineDash);\n        context.lineDashOffset = renderOptions.lineDashOffset;\n      }\n      context.lineCap = /** @type {CanvasLineCap} */ (renderOptions.lineCap);\n      context.lineJoin = /** @type {CanvasLineJoin} */ (renderOptions.lineJoin);\n      context.miterLimit = renderOptions.miterLimit;\n      context.stroke();\n    }\n    context.closePath();\n  }\n\n  /**\n   * @private\n   * @param {RenderOptions} renderOptions Render options.\n   */\n  createHitDetectionCanvas_(renderOptions) {\n    this.hitDetectionImageSize_ = [renderOptions.size, renderOptions.size];\n    if (this.fill_) {\n      this.hitDetectionCanvas_ = this.canvas_;\n      return;\n    }\n\n    // if no fill style is set, create an extra hit-detection image with a\n    // default fill style\n    const context = createCanvasContext2D(renderOptions.size, renderOptions.size);\n    this.hitDetectionCanvas_ = context.canvas;\n\n    this.drawHitDetectionCanvas_(renderOptions, context, 0, 0);\n  }\n\n  /**\n   * @private\n   * @param {RenderOptions} renderOptions Render options.\n   * @param {CanvasRenderingContext2D} context The context.\n   * @param {number} x The origin for the symbol (x).\n   * @param {number} y The origin for the symbol (y).\n   */\n  drawHitDetectionCanvas_(renderOptions, context, x, y) {\n    // reset transform\n    context.setTransform(1, 0, 0, 1, 0, 0);\n\n    // then move to (x, y)\n    context.translate(x, y);\n\n    context.beginPath();\n\n    let points = this.points_;\n    if (points === Infinity) {\n      context.arc(\n        renderOptions.size / 2, renderOptions.size / 2,\n        this.radius_, 0, 2 * Math.PI, true);\n    } else {\n      const radius2 = (this.radius2_ !== undefined) ? this.radius2_\n        : this.radius_;\n      if (radius2 !== this.radius_) {\n        points = 2 * points;\n      }\n      let i, radiusC, angle0;\n      for (i = 0; i <= points; i++) {\n        angle0 = i * 2 * Math.PI / points - Math.PI / 2 + this.angle_;\n        radiusC = i % 2 === 0 ? this.radius_ : radius2;\n        context.lineTo(renderOptions.size / 2 + radiusC * Math.cos(angle0),\n          renderOptions.size / 2 + radiusC * Math.sin(angle0));\n      }\n    }\n\n    context.fillStyle = asString(defaultFillStyle);\n    context.fill();\n    if (this.stroke_) {\n      context.strokeStyle = renderOptions.strokeStyle;\n      context.lineWidth = renderOptions.strokeWidth;\n      if (renderOptions.lineDash) {\n        context.setLineDash(renderOptions.lineDash);\n        context.lineDashOffset = renderOptions.lineDashOffset;\n      }\n      context.stroke();\n    }\n    context.closePath();\n  }\n\n  /**\n   * @return {string} The checksum.\n   */\n  getChecksum() {\n    const strokeChecksum = this.stroke_ ?\n      this.stroke_.getChecksum() : '-';\n    const fillChecksum = this.fill_ ?\n      this.fill_.getChecksum() : '-';\n\n    const recalculate = !this.checksums_ ||\n        (strokeChecksum != this.checksums_[1] ||\n        fillChecksum != this.checksums_[2] ||\n        this.radius_ != this.checksums_[3] ||\n        this.radius2_ != this.checksums_[4] ||\n        this.angle_ != this.checksums_[5] ||\n        this.points_ != this.checksums_[6]);\n\n    if (recalculate) {\n      const checksum = 'r' + strokeChecksum + fillChecksum +\n          (this.radius_ !== undefined ? this.radius_.toString() : '-') +\n          (this.radius2_ !== undefined ? this.radius2_.toString() : '-') +\n          (this.angle_ !== undefined ? this.angle_.toString() : '-') +\n          (this.points_ !== undefined ? this.points_.toString() : '-');\n      this.checksums_ = [checksum, strokeChecksum, fillChecksum,\n        this.radius_, this.radius2_, this.angle_, this.points_];\n    }\n\n    return /** @type {string} */ (this.checksums_[0]);\n  }\n}\n\n\nexport default RegularShape;\n","/**\n * @module ol/style/Circle\n */\n\nimport RegularShape from './RegularShape.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"./Fill.js\").default} [fill] Fill style.\n * @property {number} radius Circle radius.\n * @property {import(\"./Stroke.js\").default} [stroke] Stroke style.\n * @property {import(\"./AtlasManager.js\").default} [atlasManager] The atlas manager to use for this circle.\n * When using WebGL it is recommended to use an atlas manager to avoid texture switching. If an atlas manager is given,\n * the circle is added to an atlas. By default no atlas manager is used.\n */\n\n\n/**\n * @classdesc\n * Set circle style for vector features.\n * @api\n */\nclass CircleStyle extends RegularShape {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || /** @type {Options} */ ({});\n\n    super({\n      points: Infinity,\n      fill: options.fill,\n      radius: options.radius,\n      stroke: options.stroke,\n      atlasManager: options.atlasManager\n    });\n\n  }\n\n  /**\n  * Clones the style.  If an atlasmanager was provided to the original style it will be used in the cloned style, too.\n  * @return {CircleStyle} The cloned style.\n  * @override\n  * @api\n  */\n  clone() {\n    const style = new CircleStyle({\n      fill: this.getFill() ? this.getFill().clone() : undefined,\n      stroke: this.getStroke() ? this.getStroke().clone() : undefined,\n      radius: this.getRadius(),\n      atlasManager: this.atlasManager_\n    });\n    style.setOpacity(this.getOpacity());\n    style.setScale(this.getScale());\n    return style;\n  }\n\n  /**\n  * Set the circle radius.\n  *\n  * @param {number} radius Circle radius.\n  * @api\n  */\n  setRadius(radius) {\n    this.radius_ = radius;\n    this.render_(this.atlasManager_);\n  }\n}\n\n\nexport default CircleStyle;\n","/**\n * @module ol/style/Fill\n */\nimport {getUid} from '../util.js';\nimport {asString} from '../color.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../color.js\").Color|import(\"../colorlike.js\").ColorLike} [color] A color, gradient or pattern.\n * See {@link module:ol/color~Color} and {@link module:ol/colorlike~ColorLike} for possible formats.\n * Default null; if null, the Canvas/renderer default black will be used.\n */\n\n\n/**\n * @classdesc\n * Set fill style for vector features.\n * @api\n */\nclass Fill {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @type {import(\"../color.js\").Color|import(\"../colorlike.js\").ColorLike}\n     */\n    this.color_ = options.color !== undefined ? options.color : null;\n\n    /**\n     * @private\n     * @type {string|undefined}\n     */\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Clones the style. The color is not cloned if it is an {@link module:ol/colorlike~ColorLike}.\n   * @return {Fill} The cloned style.\n   * @api\n   */\n  clone() {\n    const color = this.getColor();\n    return new Fill({\n      color: Array.isArray(color) ? color.slice() : color || undefined\n    });\n  }\n\n  /**\n   * Get the fill color.\n   * @return {import(\"../color.js\").Color|import(\"../colorlike.js\").ColorLike} Color.\n   * @api\n   */\n  getColor() {\n    return this.color_;\n  }\n\n  /**\n   * Set the color.\n   *\n   * @param {import(\"../color.js\").Color|import(\"../colorlike.js\").ColorLike} color Color.\n   * @api\n   */\n  setColor(color) {\n    this.color_ = color;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * @return {string} The checksum.\n   */\n  getChecksum() {\n    if (this.checksum_ === undefined) {\n      const color = this.color_;\n      if (color) {\n        if (Array.isArray(color) || typeof color == 'string') {\n          this.checksum_ = 'f' + asString(/** @type {import(\"../color.js\").Color|string} */ (color));\n        } else {\n          this.checksum_ = getUid(this.color_);\n        }\n      } else {\n        this.checksum_ = 'f-';\n      }\n    }\n\n    return this.checksum_;\n  }\n}\n\nexport default Fill;\n","/**\n * @module ol/style/Stroke\n */\nimport {getUid} from '../util.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../color.js\").Color|import(\"../colorlike.js\").ColorLike} [color] A color, gradient or pattern.\n * See {@link module:ol/color~Color} and {@link module:ol/colorlike~ColorLike} for possible formats.\n * Default null; if null, the Canvas/renderer default black will be used.\n * @property {string} [lineCap='round'] Line cap style: `butt`, `round`, or `square`.\n * @property {string} [lineJoin='round'] Line join style: `bevel`, `round`, or `miter`.\n * @property {Array<number>} [lineDash] Line dash pattern. Default is `undefined` (no dash).\n * Please note that Internet Explorer 10 and lower do not support the `setLineDash` method on\n * the `CanvasRenderingContext2D` and therefore this option will have no visual effect in these browsers.\n * @property {number} [lineDashOffset=0] Line dash offset.\n * @property {number} [miterLimit=10] Miter limit.\n * @property {number} [width] Width.\n */\n\n\n/**\n * @classdesc\n * Set stroke style for vector features.\n * Note that the defaults given are the Canvas defaults, which will be used if\n * option is not defined. The `get` functions return whatever was entered in\n * the options; they will not return the default.\n * @api\n */\nclass Stroke {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @type {import(\"../color.js\").Color|import(\"../colorlike.js\").ColorLike}\n     */\n    this.color_ = options.color !== undefined ? options.color : null;\n\n    /**\n     * @private\n     * @type {string|undefined}\n     */\n    this.lineCap_ = options.lineCap;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.lineDash_ = options.lineDash !== undefined ? options.lineDash : null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.lineDashOffset_ = options.lineDashOffset;\n\n    /**\n     * @private\n     * @type {string|undefined}\n     */\n    this.lineJoin_ = options.lineJoin;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.miterLimit_ = options.miterLimit;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.width_ = options.width;\n\n    /**\n     * @private\n     * @type {string|undefined}\n     */\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Clones the style.\n   * @return {Stroke} The cloned style.\n   * @api\n   */\n  clone() {\n    const color = this.getColor();\n    return new Stroke({\n      color: Array.isArray(color) ? color.slice() : color || undefined,\n      lineCap: this.getLineCap(),\n      lineDash: this.getLineDash() ? this.getLineDash().slice() : undefined,\n      lineDashOffset: this.getLineDashOffset(),\n      lineJoin: this.getLineJoin(),\n      miterLimit: this.getMiterLimit(),\n      width: this.getWidth()\n    });\n  }\n\n  /**\n   * Get the stroke color.\n   * @return {import(\"../color.js\").Color|import(\"../colorlike.js\").ColorLike} Color.\n   * @api\n   */\n  getColor() {\n    return this.color_;\n  }\n\n  /**\n   * Get the line cap type for the stroke.\n   * @return {string|undefined} Line cap.\n   * @api\n   */\n  getLineCap() {\n    return this.lineCap_;\n  }\n\n  /**\n   * Get the line dash style for the stroke.\n   * @return {Array<number>} Line dash.\n   * @api\n   */\n  getLineDash() {\n    return this.lineDash_;\n  }\n\n  /**\n   * Get the line dash offset for the stroke.\n   * @return {number|undefined} Line dash offset.\n   * @api\n   */\n  getLineDashOffset() {\n    return this.lineDashOffset_;\n  }\n\n  /**\n   * Get the line join type for the stroke.\n   * @return {string|undefined} Line join.\n   * @api\n   */\n  getLineJoin() {\n    return this.lineJoin_;\n  }\n\n  /**\n   * Get the miter limit for the stroke.\n   * @return {number|undefined} Miter limit.\n   * @api\n   */\n  getMiterLimit() {\n    return this.miterLimit_;\n  }\n\n  /**\n   * Get the stroke width.\n   * @return {number|undefined} Width.\n   * @api\n   */\n  getWidth() {\n    return this.width_;\n  }\n\n  /**\n   * Set the color.\n   *\n   * @param {import(\"../color.js\").Color|import(\"../colorlike.js\").ColorLike} color Color.\n   * @api\n   */\n  setColor(color) {\n    this.color_ = color;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the line cap.\n   *\n   * @param {string|undefined} lineCap Line cap.\n   * @api\n   */\n  setLineCap(lineCap) {\n    this.lineCap_ = lineCap;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the line dash.\n   *\n   * Please note that Internet Explorer 10 and lower [do not support][mdn] the\n   * `setLineDash` method on the `CanvasRenderingContext2D` and therefore this\n   * property will have no visual effect in these browsers.\n   *\n   * [mdn]: https://developer.mozilla.org/en-US/docs/Web/API/CanvasRenderingContext2D/setLineDash#Browser_compatibility\n   *\n   * @param {Array<number>} lineDash Line dash.\n   * @api\n   */\n  setLineDash(lineDash) {\n    this.lineDash_ = lineDash;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the line dash offset.\n   *\n   * @param {number|undefined} lineDashOffset Line dash offset.\n   * @api\n   */\n  setLineDashOffset(lineDashOffset) {\n    this.lineDashOffset_ = lineDashOffset;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the line join.\n   *\n   * @param {string|undefined} lineJoin Line join.\n   * @api\n   */\n  setLineJoin(lineJoin) {\n    this.lineJoin_ = lineJoin;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the miter limit.\n   *\n   * @param {number|undefined} miterLimit Miter limit.\n   * @api\n   */\n  setMiterLimit(miterLimit) {\n    this.miterLimit_ = miterLimit;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * Set the width.\n   *\n   * @param {number|undefined} width Width.\n   * @api\n   */\n  setWidth(width) {\n    this.width_ = width;\n    this.checksum_ = undefined;\n  }\n\n  /**\n   * @return {string} The checksum.\n   */\n  getChecksum() {\n    if (this.checksum_ === undefined) {\n      this.checksum_ = 's';\n      if (this.color_) {\n        if (typeof this.color_ === 'string') {\n          this.checksum_ += this.color_;\n        } else {\n          this.checksum_ += getUid(this.color_);\n        }\n      } else {\n        this.checksum_ += '-';\n      }\n      this.checksum_ += ',' +\n          (this.lineCap_ !== undefined ?\n            this.lineCap_.toString() : '-') + ',' +\n          (this.lineDash_ ?\n            this.lineDash_.toString() : '-') + ',' +\n          (this.lineDashOffset_ !== undefined ?\n            this.lineDashOffset_ : '-') + ',' +\n          (this.lineJoin_ !== undefined ?\n            this.lineJoin_ : '-') + ',' +\n          (this.miterLimit_ !== undefined ?\n            this.miterLimit_.toString() : '-') + ',' +\n          (this.width_ !== undefined ?\n            this.width_.toString() : '-');\n    }\n\n    return this.checksum_;\n  }\n}\n\nexport default Stroke;\n","/**\n * @module ol/style/Style\n */\n\n/**\n * Feature styles.\n *\n * If no style is defined, the following default style is used:\n * ```js\n *  import {Fill, Stroke, Circle, Style} from 'ol/style';\n *\n *  var fill = new Fill({\n *    color: 'rgba(255,255,255,0.4)'\n *  });\n *  var stroke = new Stroke({\n *    color: '#3399CC',\n *    width: 1.25\n *  });\n *  var styles = [\n *    new Style({\n *      image: new Circle({\n *        fill: fill,\n *        stroke: stroke,\n *        radius: 5\n *      }),\n *      fill: fill,\n *      stroke: stroke\n *    })\n *  ];\n * ```\n *\n * A separate editing style has the following defaults:\n * ```js\n *  import {Fill, Stroke, Circle, Style} from 'ol/style';\n *  import GeometryType from 'ol/geom/GeometryType';\n *\n *  var white = [255, 255, 255, 1];\n *  var blue = [0, 153, 255, 1];\n *  var width = 3;\n *  styles[GeometryType.POLYGON] = [\n *    new Style({\n *      fill: new Fill({\n *        color: [255, 255, 255, 0.5]\n *      })\n *    })\n *  ];\n *  styles[GeometryType.MULTI_POLYGON] =\n *      styles[GeometryType.POLYGON];\n *  styles[GeometryType.LINE_STRING] = [\n *    new Style({\n *      stroke: new Stroke({\n *        color: white,\n *        width: width + 2\n *      })\n *    }),\n *    new Style({\n *      stroke: new Stroke({\n *        color: blue,\n *        width: width\n *      })\n *    })\n *  ];\n *  styles[GeometryType.MULTI_LINE_STRING] =\n *      styles[GeometryType.LINE_STRING];\n *  styles[GeometryType.POINT] = [\n *    new Style({\n *      image: new Circle({\n *        radius: width * 2,\n *        fill: new Fill({\n *          color: blue\n *        }),\n *        stroke: new Stroke({\n *          color: white,\n *          width: width / 2\n *        })\n *      }),\n *      zIndex: Infinity\n *    })\n *  ];\n *  styles[GeometryType.MULTI_POINT] =\n *      styles[GeometryType.POINT];\n *  styles[GeometryType.GEOMETRY_COLLECTION] =\n *      styles[GeometryType.POLYGON].concat(\n *          styles[GeometryType.LINE_STRING],\n *          styles[GeometryType.POINT]\n *      );\n * ```\n */\nimport {assert} from '../asserts.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport CircleStyle from './Circle.js';\nimport Fill from './Fill.js';\nimport Stroke from './Stroke.js';\n\n\n/**\n * A function that takes an {@link module:ol/Feature} and a `{number}`\n * representing the view's resolution. The function should return a\n * {@link module:ol/style/Style} or an array of them. This way e.g. a\n * vector layer can be styled.\n *\n * @typedef {function(import(\"../Feature.js\").FeatureLike, number):(Style|Array<Style>)} StyleFunction\n */\n\n/**\n * A {@link Style}, an array of {@link Style}, or a {@link StyleFunction}.\n * @typedef {Style|Array<Style>|StyleFunction} StyleLike\n */\n\n/**\n * A function that takes an {@link module:ol/Feature} as argument and returns an\n * {@link module:ol/geom/Geometry} that will be rendered and styled for the feature.\n *\n * @typedef {function(import(\"../Feature.js\").FeatureLike):\n *     (import(\"../geom/Geometry.js\").default|import(\"../render/Feature.js\").default|undefined)} GeometryFunction\n */\n\n\n/**\n * Custom renderer function. Takes two arguments:\n *\n * 1. The pixel coordinates of the geometry in GeoJSON notation.\n * 2. The {@link module:ol/render~State} of the layer renderer.\n *\n * @typedef {function((import(\"../coordinate.js\").Coordinate|Array<import(\"../coordinate.js\").Coordinate>|Array<Array<import(\"../coordinate.js\").Coordinate>>),import(\"../render.js\").State)}\n * RenderFunction\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {string|import(\"../geom/Geometry.js\").default|GeometryFunction} [geometry] Feature property or geometry\n * or function returning a geometry to render for this style.\n * @property {import(\"./Fill.js\").default} [fill] Fill style.\n * @property {import(\"./Image.js\").default} [image] Image style.\n * @property {RenderFunction} [renderer] Custom renderer. When configured, `fill`, `stroke` and `image` will be\n * ignored, and the provided function will be called with each render frame for each geometry.\n * @property {import(\"./Stroke.js\").default} [stroke] Stroke style.\n * @property {import(\"./Text.js\").default} [text] Text style.\n * @property {number} [zIndex] Z index.\n */\n\n/**\n * @classdesc\n * Container for vector feature rendering styles. Any changes made to the style\n * or its children through `set*()` methods will not take effect until the\n * feature or layer that uses the style is re-rendered.\n * @api\n */\nclass Style {\n  /**\n   * @param {Options=} opt_options Style options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    /**\n     * @private\n     * @type {string|import(\"../geom/Geometry.js\").default|GeometryFunction}\n     */\n    this.geometry_ = null;\n\n    /**\n     * @private\n     * @type {!GeometryFunction}\n     */\n    this.geometryFunction_ = defaultGeometryFunction;\n\n    if (options.geometry !== undefined) {\n      this.setGeometry(options.geometry);\n    }\n\n    /**\n     * @private\n     * @type {import(\"./Fill.js\").default}\n     */\n    this.fill_ = options.fill !== undefined ? options.fill : null;\n\n    /**\n       * @private\n       * @type {import(\"./Image.js\").default}\n       */\n    this.image_ = options.image !== undefined ? options.image : null;\n\n    /**\n     * @private\n     * @type {RenderFunction|null}\n     */\n    this.renderer_ = options.renderer !== undefined ? options.renderer : null;\n\n    /**\n     * @private\n     * @type {import(\"./Stroke.js\").default}\n     */\n    this.stroke_ = options.stroke !== undefined ? options.stroke : null;\n\n    /**\n     * @private\n     * @type {import(\"./Text.js\").default}\n     */\n    this.text_ = options.text !== undefined ? options.text : null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.zIndex_ = options.zIndex;\n\n  }\n\n  /**\n   * Clones the style.\n   * @return {Style} The cloned style.\n   * @api\n   */\n  clone() {\n    let geometry = this.getGeometry();\n    if (geometry && typeof geometry === 'object') {\n      geometry = /** @type {import(\"../geom/Geometry.js\").default} */ (geometry).clone();\n    }\n    return new Style({\n      geometry: geometry,\n      fill: this.getFill() ? this.getFill().clone() : undefined,\n      image: this.getImage() ? this.getImage().clone() : undefined,\n      stroke: this.getStroke() ? this.getStroke().clone() : undefined,\n      text: this.getText() ? this.getText().clone() : undefined,\n      zIndex: this.getZIndex()\n    });\n  }\n\n  /**\n   * Get the custom renderer function that was configured with\n   * {@link #setRenderer} or the `renderer` constructor option.\n   * @return {RenderFunction|null} Custom renderer function.\n   * @api\n   */\n  getRenderer() {\n    return this.renderer_;\n  }\n\n  /**\n   * Sets a custom renderer function for this style. When set, `fill`, `stroke`\n   * and `image` options of the style will be ignored.\n   * @param {RenderFunction|null} renderer Custom renderer function.\n   * @api\n   */\n  setRenderer(renderer) {\n    this.renderer_ = renderer;\n  }\n\n  /**\n   * Get the geometry to be rendered.\n   * @return {string|import(\"../geom/Geometry.js\").default|GeometryFunction}\n   * Feature property or geometry or function that returns the geometry that will\n   * be rendered with this style.\n   * @api\n   */\n  getGeometry() {\n    return this.geometry_;\n  }\n\n  /**\n   * Get the function used to generate a geometry for rendering.\n   * @return {!GeometryFunction} Function that is called with a feature\n   * and returns the geometry to render instead of the feature's geometry.\n   * @api\n   */\n  getGeometryFunction() {\n    return this.geometryFunction_;\n  }\n\n  /**\n   * Get the fill style.\n   * @return {import(\"./Fill.js\").default} Fill style.\n   * @api\n   */\n  getFill() {\n    return this.fill_;\n  }\n\n  /**\n   * Set the fill style.\n   * @param {import(\"./Fill.js\").default} fill Fill style.\n   * @api\n   */\n  setFill(fill) {\n    this.fill_ = fill;\n  }\n\n  /**\n   * Get the image style.\n   * @return {import(\"./Image.js\").default} Image style.\n   * @api\n   */\n  getImage() {\n    return this.image_;\n  }\n\n  /**\n   * Set the image style.\n   * @param {import(\"./Image.js\").default} image Image style.\n   * @api\n   */\n  setImage(image) {\n    this.image_ = image;\n  }\n\n  /**\n   * Get the stroke style.\n   * @return {import(\"./Stroke.js\").default} Stroke style.\n   * @api\n   */\n  getStroke() {\n    return this.stroke_;\n  }\n\n  /**\n   * Set the stroke style.\n   * @param {import(\"./Stroke.js\").default} stroke Stroke style.\n   * @api\n   */\n  setStroke(stroke) {\n    this.stroke_ = stroke;\n  }\n\n  /**\n   * Get the text style.\n   * @return {import(\"./Text.js\").default} Text style.\n   * @api\n   */\n  getText() {\n    return this.text_;\n  }\n\n  /**\n   * Set the text style.\n   * @param {import(\"./Text.js\").default} text Text style.\n   * @api\n   */\n  setText(text) {\n    this.text_ = text;\n  }\n\n  /**\n   * Get the z-index for the style.\n   * @return {number|undefined} ZIndex.\n   * @api\n   */\n  getZIndex() {\n    return this.zIndex_;\n  }\n\n  /**\n   * Set a geometry that is rendered instead of the feature's geometry.\n   *\n   * @param {string|import(\"../geom/Geometry.js\").default|GeometryFunction} geometry\n   *     Feature property or geometry or function returning a geometry to render\n   *     for this style.\n   * @api\n   */\n  setGeometry(geometry) {\n    if (typeof geometry === 'function') {\n      this.geometryFunction_ = geometry;\n    } else if (typeof geometry === 'string') {\n      this.geometryFunction_ = function(feature) {\n        return (\n          /** @type {import(\"../geom/Geometry.js\").default} */ (feature.get(geometry))\n        );\n      };\n    } else if (!geometry) {\n      this.geometryFunction_ = defaultGeometryFunction;\n    } else if (geometry !== undefined) {\n      this.geometryFunction_ = function() {\n        return (\n          /** @type {import(\"../geom/Geometry.js\").default} */ (geometry)\n        );\n      };\n    }\n    this.geometry_ = geometry;\n  }\n\n  /**\n   * Set the z-index.\n   *\n   * @param {number|undefined} zIndex ZIndex.\n   * @api\n   */\n  setZIndex(zIndex) {\n    this.zIndex_ = zIndex;\n  }\n}\n\n\n/**\n * Convert the provided object into a style function.  Functions passed through\n * unchanged.  Arrays of Style or single style objects wrapped in a\n * new style function.\n * @param {StyleFunction|Array<Style>|Style} obj\n *     A style function, a single style, or an array of styles.\n * @return {StyleFunction} A style function.\n */\nexport function toFunction(obj) {\n  let styleFunction;\n\n  if (typeof obj === 'function') {\n    styleFunction = obj;\n  } else {\n    /**\n     * @type {Array<Style>}\n     */\n    let styles;\n    if (Array.isArray(obj)) {\n      styles = obj;\n    } else {\n      assert(typeof /** @type {?} */ (obj).getZIndex === 'function',\n        41); // Expected an `Style` or an array of `Style`\n      const style = /** @type {Style} */ (obj);\n      styles = [style];\n    }\n    styleFunction = function() {\n      return styles;\n    };\n  }\n  return styleFunction;\n}\n\n\n/**\n * @type {Array<Style>}\n */\nlet defaultStyles = null;\n\n\n/**\n * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n * @param {number} resolution Resolution.\n * @return {Array<Style>} Style.\n */\nexport function createDefaultStyle(feature, resolution) {\n  // We don't use an immediately-invoked function\n  // and a closure so we don't get an error at script evaluation time in\n  // browsers that do not support Canvas. (import(\"./Circle.js\").CircleStyle does\n  // canvas.getContext('2d') at construction time, which will cause an.error\n  // in such browsers.)\n  if (!defaultStyles) {\n    const fill = new Fill({\n      color: 'rgba(255,255,255,0.4)'\n    });\n    const stroke = new Stroke({\n      color: '#3399CC',\n      width: 1.25\n    });\n    defaultStyles = [\n      new Style({\n        image: new CircleStyle({\n          fill: fill,\n          stroke: stroke,\n          radius: 5\n        }),\n        fill: fill,\n        stroke: stroke\n      })\n    ];\n  }\n  return defaultStyles;\n}\n\n\n/**\n * Default styles for editing features.\n * @return {Object<import(\"../geom/GeometryType.js\").default, Array<Style>>} Styles\n */\nexport function createEditingStyle() {\n  /** @type {Object<import(\"../geom/GeometryType.js\").default, Array<Style>>} */\n  const styles = {};\n  const white = [255, 255, 255, 1];\n  const blue = [0, 153, 255, 1];\n  const width = 3;\n  styles[GeometryType.POLYGON] = [\n    new Style({\n      fill: new Fill({\n        color: [255, 255, 255, 0.5]\n      })\n    })\n  ];\n  styles[GeometryType.MULTI_POLYGON] =\n      styles[GeometryType.POLYGON];\n\n  styles[GeometryType.LINE_STRING] = [\n    new Style({\n      stroke: new Stroke({\n        color: white,\n        width: width + 2\n      })\n    }),\n    new Style({\n      stroke: new Stroke({\n        color: blue,\n        width: width\n      })\n    })\n  ];\n  styles[GeometryType.MULTI_LINE_STRING] =\n      styles[GeometryType.LINE_STRING];\n\n  styles[GeometryType.CIRCLE] =\n      styles[GeometryType.POLYGON].concat(\n        styles[GeometryType.LINE_STRING]\n      );\n\n\n  styles[GeometryType.POINT] = [\n    new Style({\n      image: new CircleStyle({\n        radius: width * 2,\n        fill: new Fill({\n          color: blue\n        }),\n        stroke: new Stroke({\n          color: white,\n          width: width / 2\n        })\n      }),\n      zIndex: Infinity\n    })\n  ];\n  styles[GeometryType.MULTI_POINT] =\n      styles[GeometryType.POINT];\n\n  styles[GeometryType.GEOMETRY_COLLECTION] =\n      styles[GeometryType.POLYGON].concat(\n        styles[GeometryType.LINE_STRING],\n        styles[GeometryType.POINT]\n      );\n\n  return styles;\n}\n\n\n/**\n * Function that is called with a feature and returns its default geometry.\n * @param {import(\"../Feature.js\").FeatureLike} feature Feature to get the geometry for.\n * @return {import(\"../geom/Geometry.js\").default|import(\"../render/Feature.js\").default|undefined} Geometry to render.\n */\nfunction defaultGeometryFunction(feature) {\n  return feature.getGeometry();\n}\n\nexport default Style;\n","/**\n * @module ol/layer/Vector\n */\nimport LayerType from '../LayerType.js';\nimport Layer from './Layer.js';\nimport VectorRenderType from './VectorRenderType.js';\nimport {assign} from '../obj.js';\nimport {createDefaultStyle, toFunction as toStyleFunction} from '../style/Style.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {import(\"../extent.js\").Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position. When `undefined`, a `zIndex` of 0 is assumed\n * for layers that are added to the map's `layers` collection, or `Infinity` when the layer's `setMap()`\n * method was used.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n * @property {import(\"../render.js\").OrderFunction} [renderOrder] Render order. Function to be used when sorting\n * features before rendering. By default features are drawn in the order that they are created. Use\n * `null` to avoid the sort, but get an undefined draw order.\n * @property {number} [renderBuffer=100] The buffer in pixels around the viewport extent used by the\n * renderer when getting features from the vector source for the rendering or hit-detection.\n * Recommended value: the size of the largest symbol, line width or label.\n * @property {import(\"./VectorRenderType.js\").default|string} [renderMode='vector'] Render mode for vector layers:\n *  * `'image'`: Vector layers are rendered as images. Great performance, but point symbols and\n *    texts are always rotated with the view and pixels are scaled during zoom animations.\n *  * `'vector'`: Vector layers are rendered as vectors. Most accurate rendering even during\n *    animations, but slower performance.\n * @property {import(\"../source/Vector.js\").default} [source] Source.\n * @property {import(\"../PluggableMap.js\").default} [map] Sets the layer as overlay on a map. The map will not manage\n * this layer in its layers collection, and the layer will be rendered on top. This is useful for\n * temporary layers. The standard way to add a layer to a map and have it managed by the map is to\n * use {@link module:ol/Map#addLayer}.\n * @property {boolean} [declutter=false] Declutter images and text. Decluttering is applied to all\n * image and text styles, and the priority is defined by the z-index of the style. Lower z-index\n * means higher priority.\n * @property {import(\"../style/Style.js\").StyleLike} [style] Layer style. See\n * {@link module:ol/style} for default style which will be used if this is not defined.\n * @property {boolean} [updateWhileAnimating=false] When set to `true` and `renderMode`\n * is `vector`, feature batches will be recreated during animations. This means that no\n * vectors will be shown clipped, but the setting will have a performance impact for large\n * amounts of vector data. When set to `false`, batches will be recreated when no animation\n * is active.\n * @property {boolean} [updateWhileInteracting=false] When set to `true` and `renderMode`\n * is `vector`, feature batches will be recreated during interactions. See also\n * `updateWhileAnimating`.\n */\n\n\n/**\n * @enum {string}\n * @private\n */\nconst Property = {\n  RENDER_ORDER: 'renderOrder'\n};\n\n\n/**\n * @classdesc\n * Vector data that is rendered client-side.\n * Note that any property set in the options is set as a {@link module:ol/Object~BaseObject}\n * property on the layer object; for example, setting `title: 'My Title'` in the\n * options means that `title` is observable, and has get/set accessors.\n *\n * @api\n */\nclass VectorLayer extends Layer {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n    const options = opt_options ?\n      opt_options : /** @type {Options} */ ({});\n\n    const baseOptions = assign({}, options);\n\n    delete baseOptions.style;\n    delete baseOptions.renderBuffer;\n    delete baseOptions.updateWhileAnimating;\n    delete baseOptions.updateWhileInteracting;\n    super(baseOptions);\n\n    /**\n    * @private\n    * @type {boolean}\n    */\n    this.declutter_ = options.declutter !== undefined ? options.declutter : false;\n\n    /**\n    * @type {number}\n    * @private\n    */\n    this.renderBuffer_ = options.renderBuffer !== undefined ?\n      options.renderBuffer : 100;\n\n    /**\n    * User provided style.\n    * @type {import(\"../style/Style.js\").StyleLike}\n    * @private\n    */\n    this.style_ = null;\n\n    /**\n    * Style function for use within the library.\n    * @type {import(\"../style/Style.js\").StyleFunction|undefined}\n    * @private\n    */\n    this.styleFunction_ = undefined;\n\n    this.setStyle(options.style);\n\n    /**\n    * @type {boolean}\n    * @private\n    */\n    this.updateWhileAnimating_ = options.updateWhileAnimating !== undefined ?\n      options.updateWhileAnimating : false;\n\n    /**\n    * @type {boolean}\n    * @private\n    */\n    this.updateWhileInteracting_ = options.updateWhileInteracting !== undefined ?\n      options.updateWhileInteracting : false;\n\n    /**\n    * @private\n    * @type {import(\"./VectorTileRenderType.js\").default|string}\n    */\n    this.renderMode_ = options.renderMode || VectorRenderType.VECTOR;\n\n    /**\n    * The layer type.\n    * @protected\n    * @type {import(\"../LayerType.js\").default}\n    */\n    this.type = LayerType.VECTOR;\n\n  }\n\n  /**\n  * @return {boolean} Declutter.\n  */\n  getDeclutter() {\n    return this.declutter_;\n  }\n\n  /**\n  * @param {boolean} declutter Declutter.\n  */\n  setDeclutter(declutter) {\n    this.declutter_ = declutter;\n  }\n\n  /**\n  * @return {number|undefined} Render buffer.\n  */\n  getRenderBuffer() {\n    return this.renderBuffer_;\n  }\n\n  /**\n  * @return {function(import(\"../Feature.js\").default, import(\"../Feature.js\").default): number|null|undefined} Render\n  *     order.\n  */\n  getRenderOrder() {\n    return (\n    /** @type {import(\"../render.js\").OrderFunction|null|undefined} */ (this.get(Property.RENDER_ORDER))\n    );\n  }\n\n  /**\n  * Get the style for features.  This returns whatever was passed to the `style`\n  * option at construction or to the `setStyle` method.\n  * @return {import(\"../style/Style.js\").StyleLike}\n  *     Layer style.\n  * @api\n  */\n  getStyle() {\n    return this.style_;\n  }\n\n  /**\n  * Get the style function.\n  * @return {import(\"../style/Style.js\").StyleFunction|undefined} Layer style function.\n  * @api\n  */\n  getStyleFunction() {\n    return this.styleFunction_;\n  }\n\n  /**\n  * @return {boolean} Whether the rendered layer should be updated while\n  *     animating.\n  */\n  getUpdateWhileAnimating() {\n    return this.updateWhileAnimating_;\n  }\n\n  /**\n  * @return {boolean} Whether the rendered layer should be updated while\n  *     interacting.\n  */\n  getUpdateWhileInteracting() {\n    return this.updateWhileInteracting_;\n  }\n\n  /**\n  * @param {import(\"../render.js\").OrderFunction|null|undefined} renderOrder\n  *     Render order.\n  */\n  setRenderOrder(renderOrder) {\n    this.set(Property.RENDER_ORDER, renderOrder);\n  }\n\n  /**\n  * Set the style for features.  This can be a single style object, an array\n  * of styles, or a function that takes a feature and resolution and returns\n  * an array of styles. If it is `undefined` the default style is used. If\n  * it is `null` the layer has no style (a `null` style), so only features\n  * that have their own styles will be rendered in the layer. See\n  * {@link module:ol/style} for information on the default style.\n  * @param {import(\"../style/Style.js\").default|Array<import(\"../style/Style.js\").default>|import(\"../style/Style.js\").StyleFunction|null|undefined} style Layer style.\n  * @api\n  */\n  setStyle(style) {\n    this.style_ = style !== undefined ? style : createDefaultStyle;\n    this.styleFunction_ = style === null ?\n      undefined : toStyleFunction(this.style_);\n    this.changed();\n  }\n\n  /**\n  * @return {import(\"./VectorRenderType.js\").default|string} The render mode.\n  */\n  getRenderMode() {\n    return this.renderMode_;\n  }\n}\n\n\n/**\n * Return the associated {@link module:ol/source/Vector vectorsource} of the layer.\n * @function\n * @return {import(\"../source/Vector.js\").default} Source.\n * @api\n */\nVectorLayer.prototype.getSource;\n\n\nexport default VectorLayer;\n","/**\n * @module ol/format/FormatType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  ARRAY_BUFFER: 'arraybuffer',\n  JSON: 'json',\n  TEXT: 'text',\n  XML: 'xml'\n};\n","/**\n * @module ol/featureloader\n */\nimport {VOID} from './functions.js';\nimport FormatType from './format/FormatType.js';\n\n/**\n * {@link module:ol/source/Vector} sources use a function of this type to\n * load features.\n *\n * This function takes an {@link module:ol/extent~Extent} representing the area to be loaded,\n * a `{number}` representing the resolution (map units per pixel) and an\n * {@link module:ol/proj/Projection} for the projection  as\n * arguments. `this` within the function is bound to the\n * {@link module:ol/source/Vector} it's called from.\n *\n * The function is responsible for loading the features and adding them to the\n * source.\n * @typedef {function(this:(import(\"./source/Vector\").default|import(\"./VectorTile.js\").default), import(\"./extent.js\").Extent, number,\n *                    import(\"./proj/Projection.js\").default)} FeatureLoader\n * @api\n */\n\n\n/**\n * {@link module:ol/source/Vector} sources use a function of this type to\n * get the url to load features from.\n *\n * This function takes an {@link module:ol/extent~Extent} representing the area\n * to be loaded, a `{number}` representing the resolution (map units per pixel)\n * and an {@link module:ol/proj/Projection} for the projection  as\n * arguments and returns a `{string}` representing the URL.\n * @typedef {function(import(\"./extent.js\").Extent, number, import(\"./proj/Projection.js\").default): string} FeatureUrlFunction\n * @api\n */\n\n\n/**\n * @param {string|FeatureUrlFunction} url Feature URL service.\n * @param {import(\"./format/Feature.js\").default} format Feature format.\n * @param {function(this:import(\"./VectorTile.js\").default, Array<import(\"./Feature.js\").default>, import(\"./proj/Projection.js\").default, import(\"./extent.js\").Extent)|function(this:import(\"./source/Vector\").default, Array<import(\"./Feature.js\").default>)} success\n *     Function called with the loaded features and optionally with the data\n *     projection. Called with the vector tile or source as `this`.\n * @param {function(this:import(\"./VectorTile.js\").default)|function(this:import(\"./source/Vector\").default)} failure\n *     Function called when loading failed. Called with the vector tile or\n *     source as `this`.\n * @return {FeatureLoader} The feature loader.\n */\nexport function loadFeaturesXhr(url, format, success, failure) {\n  return (\n    /**\n     * @param {import(\"./extent.js\").Extent} extent Extent.\n     * @param {number} resolution Resolution.\n     * @param {import(\"./proj/Projection.js\").default} projection Projection.\n     * @this {import(\"./source/Vector\").default|import(\"./VectorTile.js\").default}\n     */\n    function(extent, resolution, projection) {\n      const xhr = new XMLHttpRequest();\n      xhr.open('GET',\n        typeof url === 'function' ? url(extent, resolution, projection) : url,\n        true);\n      if (format.getType() == FormatType.ARRAY_BUFFER) {\n        xhr.responseType = 'arraybuffer';\n      }\n      /**\n       * @param {Event} event Event.\n       * @private\n       */\n      xhr.onload = function(event) {\n        // status will be 0 for file:// urls\n        if (!xhr.status || xhr.status >= 200 && xhr.status < 300) {\n          const type = format.getType();\n          /** @type {Document|Node|Object|string|undefined} */\n          let source;\n          if (type == FormatType.JSON || type == FormatType.TEXT) {\n            source = xhr.responseText;\n          } else if (type == FormatType.XML) {\n            source = xhr.responseXML;\n            if (!source) {\n              source = new DOMParser().parseFromString(xhr.responseText, 'application/xml');\n            }\n          } else if (type == FormatType.ARRAY_BUFFER) {\n            source = /** @type {ArrayBuffer} */ (xhr.response);\n          }\n          if (source) {\n            success.call(this, format.readFeatures(source,\n              {featureProjection: projection}),\n            format.readProjection(source), format.getLastExtent());\n          } else {\n            failure.call(this);\n          }\n        } else {\n          failure.call(this);\n        }\n      }.bind(this);\n      /**\n       * @private\n       */\n      xhr.onerror = function() {\n        failure.call(this);\n      }.bind(this);\n      xhr.send();\n    }\n  );\n}\n\n\n/**\n * Create an XHR feature loader for a `url` and `format`. The feature loader\n * loads features (with XHR), parses the features, and adds them to the\n * vector source.\n * @param {string|FeatureUrlFunction} url Feature URL service.\n * @param {import(\"./format/Feature.js\").default} format Feature format.\n * @return {FeatureLoader} The feature loader.\n * @api\n */\nexport function xhr(url, format) {\n  return loadFeaturesXhr(url, format,\n    /**\n     * @param {Array<import(\"./Feature.js\").default>} features The loaded features.\n     * @param {import(\"./proj/Projection.js\").default} dataProjection Data\n     * projection.\n     * @this {import(\"./source/Vector\").default|import(\"./VectorTile.js\").default}\n     */\n    function(features, dataProjection) {\n      const sourceOrTile = /** @type {?} */ (this);\n      if (typeof sourceOrTile.addFeatures === 'function') {\n        /** @type {import(\"./source/Vector\").default} */ (sourceOrTile).addFeatures(features);\n      }\n    }, /* FIXME handle error */ VOID);\n}\n","/**\n * @module ol/loadingstrategy\n */\n\n\n/**\n * Strategy function for loading all features with a single request.\n * @param {import(\"./extent.js\").Extent} extent Extent.\n * @param {number} resolution Resolution.\n * @return {Array<import(\"./extent.js\").Extent>} Extents.\n * @api\n */\nexport function all(extent, resolution) {\n  return [[-Infinity, -Infinity, Infinity, Infinity]];\n}\n\n\n/**\n * Strategy function for loading features based on the view's extent and\n * resolution.\n * @param {import(\"./extent.js\").Extent} extent Extent.\n * @param {number} resolution Resolution.\n * @return {Array<import(\"./extent.js\").Extent>} Extents.\n * @api\n */\nexport function bbox(extent, resolution) {\n  return [extent];\n}\n\n\n/**\n * Creates a strategy function for loading features based on a tile grid.\n * @param {import(\"./tilegrid/TileGrid.js\").default} tileGrid Tile grid.\n * @return {function(import(\"./extent.js\").Extent, number): Array<import(\"./extent.js\").Extent>} Loading strategy.\n * @api\n */\nexport function tile(tileGrid) {\n  return (\n    /**\n     * @param {import(\"./extent.js\").Extent} extent Extent.\n     * @param {number} resolution Resolution.\n     * @return {Array<import(\"./extent.js\").Extent>} Extents.\n     */\n    function(extent, resolution) {\n      const z = tileGrid.getZForResolution(resolution);\n      const tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);\n      /** @type {Array<import(\"./extent.js\").Extent>} */\n      const extents = [];\n      /** @type {import(\"./tilecoord.js\").TileCoord} */\n      const tileCoord = [z, 0, 0];\n      for (tileCoord[1] = tileRange.minX; tileCoord[1] <= tileRange.maxX; ++tileCoord[1]) {\n        for (tileCoord[2] = tileRange.minY; tileCoord[2] <= tileRange.maxY; ++tileCoord[2]) {\n          extents.push(tileGrid.getTileCoordExtent(tileCoord));\n        }\n      }\n      return extents;\n    }\n  );\n}\n","/**\n * @module ol/source/Source\n */\nimport {abstract} from '../util.js';\nimport BaseObject from '../Object.js';\nimport {get as getProjection} from '../proj.js';\nimport SourceState from './State.js';\n\n\n/**\n * A function that returns a string or an array of strings representing source\n * attributions.\n *\n * @typedef {function(import(\"../PluggableMap.js\").FrameState): (string|Array<string>)} Attribution\n */\n\n\n/**\n * A type that can be used to provide attribution information for data sources.\n *\n * It represents either\n * * a simple string (e.g. `'© Acme Inc.'`)\n * * an array of simple strings (e.g. `['© Acme Inc.', '© Bacme Inc.']`)\n * * a function that returns a string or array of strings (`{@link module:ol/source/Source~Attribution}`)\n *\n * @typedef {string|Array<string>|Attribution} AttributionLike\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {AttributionLike} [attributions]\n * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.\n * @property {import(\"../proj.js\").ProjectionLike} projection\n * @property {SourceState} [state='ready']\n * @property {boolean} [wrapX=false]\n */\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Base class for {@link module:ol/layer/Layer~Layer} sources.\n *\n * A generic `change` event is triggered when the state of the source changes.\n * @abstract\n * @api\n */\nclass Source extends BaseObject {\n  /**\n   * @param {Options} options Source options.\n   */\n  constructor(options) {\n\n    super();\n\n    /**\n     * @private\n     * @type {import(\"../proj/Projection.js\").default}\n     */\n    this.projection_ = getProjection(options.projection);\n\n    /**\n     * @private\n     * @type {?Attribution}\n     */\n    this.attributions_ = adaptAttributions(options.attributions);\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.attributionsCollapsible_ = options.attributionsCollapsible !== undefined ?\n      options.attributionsCollapsible : true;\n\n    /**\n     * This source is currently loading data. Sources that defer loading to the\n     * map's tile queue never set this to `true`.\n     * @type {boolean}\n     */\n    this.loading = false;\n\n    /**\n     * @private\n     * @type {SourceState}\n     */\n    this.state_ = options.state !== undefined ?\n      options.state : SourceState.READY;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.wrapX_ = options.wrapX !== undefined ? options.wrapX : false;\n\n  }\n\n  /**\n   * Get the attribution function for the source.\n   * @return {?Attribution} Attribution function.\n   */\n  getAttributions() {\n    return this.attributions_;\n  }\n\n  /**\n   * @return {boolean} Aattributions are collapsible.\n   */\n  getAttributionsCollapsible() {\n    return this.attributionsCollapsible_;\n  }\n\n  /**\n   * Get the projection of the source.\n   * @return {import(\"../proj/Projection.js\").default} Projection.\n   * @api\n   */\n  getProjection() {\n    return this.projection_;\n  }\n\n  /**\n   * @abstract\n   * @return {Array<number>|undefined} Resolutions.\n   */\n  getResolutions() {\n    return abstract();\n  }\n\n  /**\n   * Get the state of the source, see {@link module:ol/source/State~State} for possible states.\n   * @return {SourceState} State.\n   * @api\n   */\n  getState() {\n    return this.state_;\n  }\n\n  /**\n   * @return {boolean|undefined} Wrap X.\n   */\n  getWrapX() {\n    return this.wrapX_;\n  }\n\n  /**\n   * Refreshes the source and finally dispatches a 'change' event.\n   * @api\n   */\n  refresh() {\n    this.changed();\n  }\n\n  /**\n   * Set the attributions of the source.\n   * @param {AttributionLike|undefined} attributions Attributions.\n   *     Can be passed as `string`, `Array<string>`, `{@link module:ol/source/Source~Attribution}`,\n   *     or `undefined`.\n   * @api\n   */\n  setAttributions(attributions) {\n    this.attributions_ = adaptAttributions(attributions);\n    this.changed();\n  }\n\n  /**\n   * Set the state of the source.\n   * @param {SourceState} state State.\n   * @protected\n   */\n  setState(state) {\n    this.state_ = state;\n    this.changed();\n  }\n}\n\n\n/**\n * Turns the attributions option into an attributions function.\n * @param {AttributionLike|undefined} attributionLike The attribution option.\n * @return {?Attribution} An attribution function (or null).\n */\nfunction adaptAttributions(attributionLike) {\n  if (!attributionLike) {\n    return null;\n  }\n  if (Array.isArray(attributionLike)) {\n    return function(frameState) {\n      return attributionLike;\n    };\n  }\n\n  if (typeof attributionLike === 'function') {\n    return attributionLike;\n  }\n\n  return function(frameState) {\n    return [attributionLike];\n  };\n}\n\n\nexport default Source;\n","/**\n * @module ol/source/VectorEventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  /**\n   * Triggered when a feature is added to the source.\n   * @event ol/source/Vector.VectorSourceEvent#addfeature\n   * @api\n   */\n  ADDFEATURE: 'addfeature',\n\n  /**\n   * Triggered when a feature is updated.\n   * @event ol/source/Vector.VectorSourceEvent#changefeature\n   * @api\n   */\n  CHANGEFEATURE: 'changefeature',\n\n  /**\n   * Triggered when the clear method is called on the source.\n   * @event ol/source/Vector.VectorSourceEvent#clear\n   * @api\n   */\n  CLEAR: 'clear',\n\n  /**\n   * Triggered when a feature is removed from the source.\n   * See {@link module:ol/source/Vector#clear source.clear()} for exceptions.\n   * @event ol/source/Vector.VectorSourceEvent#removefeature\n   * @api\n   */\n  REMOVEFEATURE: 'removefeature'\n};\n","(function (global, factory) {\n\ttypeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory() :\n\ttypeof define === 'function' && define.amd ? define(factory) :\n\t(global.quickselect = factory());\n}(this, (function () { 'use strict';\n\nfunction quickselect(arr, k, left, right, compare) {\n    quickselectStep(arr, k, left || 0, right || (arr.length - 1), compare || defaultCompare);\n}\n\nfunction quickselectStep(arr, k, left, right, compare) {\n\n    while (right > left) {\n        if (right - left > 600) {\n            var n = right - left + 1;\n            var m = k - left + 1;\n            var z = Math.log(n);\n            var s = 0.5 * Math.exp(2 * z / 3);\n            var sd = 0.5 * Math.sqrt(z * s * (n - s) / n) * (m - n / 2 < 0 ? -1 : 1);\n            var newLeft = Math.max(left, Math.floor(k - m * s / n + sd));\n            var newRight = Math.min(right, Math.floor(k + (n - m) * s / n + sd));\n            quickselectStep(arr, k, newLeft, newRight, compare);\n        }\n\n        var t = arr[k];\n        var i = left;\n        var j = right;\n\n        swap(arr, left, k);\n        if (compare(arr[right], t) > 0) swap(arr, left, right);\n\n        while (i < j) {\n            swap(arr, i, j);\n            i++;\n            j--;\n            while (compare(arr[i], t) < 0) i++;\n            while (compare(arr[j], t) > 0) j--;\n        }\n\n        if (compare(arr[left], t) === 0) swap(arr, left, j);\n        else {\n            j++;\n            swap(arr, j, right);\n        }\n\n        if (j <= k) left = j + 1;\n        if (k <= j) right = j - 1;\n    }\n}\n\nfunction swap(arr, i, j) {\n    var tmp = arr[i];\n    arr[i] = arr[j];\n    arr[j] = tmp;\n}\n\nfunction defaultCompare(a, b) {\n    return a < b ? -1 : a > b ? 1 : 0;\n}\n\nreturn quickselect;\n\n})));\n","'use strict';\n\nmodule.exports = rbush;\nmodule.exports.default = rbush;\n\nvar quickselect = require('quickselect');\n\nfunction rbush(maxEntries, format) {\n    if (!(this instanceof rbush)) return new rbush(maxEntries, format);\n\n    // max entries in a node is 9 by default; min node fill is 40% for best performance\n    this._maxEntries = Math.max(4, maxEntries || 9);\n    this._minEntries = Math.max(2, Math.ceil(this._maxEntries * 0.4));\n\n    if (format) {\n        this._initFormat(format);\n    }\n\n    this.clear();\n}\n\nrbush.prototype = {\n\n    all: function () {\n        return this._all(this.data, []);\n    },\n\n    search: function (bbox) {\n\n        var node = this.data,\n            result = [],\n            toBBox = this.toBBox;\n\n        if (!intersects(bbox, node)) return result;\n\n        var nodesToSearch = [],\n            i, len, child, childBBox;\n\n        while (node) {\n            for (i = 0, len = node.children.length; i < len; i++) {\n\n                child = node.children[i];\n                childBBox = node.leaf ? toBBox(child) : child;\n\n                if (intersects(bbox, childBBox)) {\n                    if (node.leaf) result.push(child);\n                    else if (contains(bbox, childBBox)) this._all(child, result);\n                    else nodesToSearch.push(child);\n                }\n            }\n            node = nodesToSearch.pop();\n        }\n\n        return result;\n    },\n\n    collides: function (bbox) {\n\n        var node = this.data,\n            toBBox = this.toBBox;\n\n        if (!intersects(bbox, node)) return false;\n\n        var nodesToSearch = [],\n            i, len, child, childBBox;\n\n        while (node) {\n            for (i = 0, len = node.children.length; i < len; i++) {\n\n                child = node.children[i];\n                childBBox = node.leaf ? toBBox(child) : child;\n\n                if (intersects(bbox, childBBox)) {\n                    if (node.leaf || contains(bbox, childBBox)) return true;\n                    nodesToSearch.push(child);\n                }\n            }\n            node = nodesToSearch.pop();\n        }\n\n        return false;\n    },\n\n    load: function (data) {\n        if (!(data && data.length)) return this;\n\n        if (data.length < this._minEntries) {\n            for (var i = 0, len = data.length; i < len; i++) {\n                this.insert(data[i]);\n            }\n            return this;\n        }\n\n        // recursively build the tree with the given data from scratch using OMT algorithm\n        var node = this._build(data.slice(), 0, data.length - 1, 0);\n\n        if (!this.data.children.length) {\n            // save as is if tree is empty\n            this.data = node;\n\n        } else if (this.data.height === node.height) {\n            // split root if trees have the same height\n            this._splitRoot(this.data, node);\n\n        } else {\n            if (this.data.height < node.height) {\n                // swap trees if inserted one is bigger\n                var tmpNode = this.data;\n                this.data = node;\n                node = tmpNode;\n            }\n\n            // insert the small tree into the large tree at appropriate level\n            this._insert(node, this.data.height - node.height - 1, true);\n        }\n\n        return this;\n    },\n\n    insert: function (item) {\n        if (item) this._insert(item, this.data.height - 1);\n        return this;\n    },\n\n    clear: function () {\n        this.data = createNode([]);\n        return this;\n    },\n\n    remove: function (item, equalsFn) {\n        if (!item) return this;\n\n        var node = this.data,\n            bbox = this.toBBox(item),\n            path = [],\n            indexes = [],\n            i, parent, index, goingUp;\n\n        // depth-first iterative tree traversal\n        while (node || path.length) {\n\n            if (!node) { // go up\n                node = path.pop();\n                parent = path[path.length - 1];\n                i = indexes.pop();\n                goingUp = true;\n            }\n\n            if (node.leaf) { // check current node\n                index = findItem(item, node.children, equalsFn);\n\n                if (index !== -1) {\n                    // item found, remove the item and condense tree upwards\n                    node.children.splice(index, 1);\n                    path.push(node);\n                    this._condense(path);\n                    return this;\n                }\n            }\n\n            if (!goingUp && !node.leaf && contains(node, bbox)) { // go down\n                path.push(node);\n                indexes.push(i);\n                i = 0;\n                parent = node;\n                node = node.children[0];\n\n            } else if (parent) { // go right\n                i++;\n                node = parent.children[i];\n                goingUp = false;\n\n            } else node = null; // nothing found\n        }\n\n        return this;\n    },\n\n    toBBox: function (item) { return item; },\n\n    compareMinX: compareNodeMinX,\n    compareMinY: compareNodeMinY,\n\n    toJSON: function () { return this.data; },\n\n    fromJSON: function (data) {\n        this.data = data;\n        return this;\n    },\n\n    _all: function (node, result) {\n        var nodesToSearch = [];\n        while (node) {\n            if (node.leaf) result.push.apply(result, node.children);\n            else nodesToSearch.push.apply(nodesToSearch, node.children);\n\n            node = nodesToSearch.pop();\n        }\n        return result;\n    },\n\n    _build: function (items, left, right, height) {\n\n        var N = right - left + 1,\n            M = this._maxEntries,\n            node;\n\n        if (N <= M) {\n            // reached leaf level; return leaf\n            node = createNode(items.slice(left, right + 1));\n            calcBBox(node, this.toBBox);\n            return node;\n        }\n\n        if (!height) {\n            // target height of the bulk-loaded tree\n            height = Math.ceil(Math.log(N) / Math.log(M));\n\n            // target number of root entries to maximize storage utilization\n            M = Math.ceil(N / Math.pow(M, height - 1));\n        }\n\n        node = createNode([]);\n        node.leaf = false;\n        node.height = height;\n\n        // split the items into M mostly square tiles\n\n        var N2 = Math.ceil(N / M),\n            N1 = N2 * Math.ceil(Math.sqrt(M)),\n            i, j, right2, right3;\n\n        multiSelect(items, left, right, N1, this.compareMinX);\n\n        for (i = left; i <= right; i += N1) {\n\n            right2 = Math.min(i + N1 - 1, right);\n\n            multiSelect(items, i, right2, N2, this.compareMinY);\n\n            for (j = i; j <= right2; j += N2) {\n\n                right3 = Math.min(j + N2 - 1, right2);\n\n                // pack each entry recursively\n                node.children.push(this._build(items, j, right3, height - 1));\n            }\n        }\n\n        calcBBox(node, this.toBBox);\n\n        return node;\n    },\n\n    _chooseSubtree: function (bbox, node, level, path) {\n\n        var i, len, child, targetNode, area, enlargement, minArea, minEnlargement;\n\n        while (true) {\n            path.push(node);\n\n            if (node.leaf || path.length - 1 === level) break;\n\n            minArea = minEnlargement = Infinity;\n\n            for (i = 0, len = node.children.length; i < len; i++) {\n                child = node.children[i];\n                area = bboxArea(child);\n                enlargement = enlargedArea(bbox, child) - area;\n\n                // choose entry with the least area enlargement\n                if (enlargement < minEnlargement) {\n                    minEnlargement = enlargement;\n                    minArea = area < minArea ? area : minArea;\n                    targetNode = child;\n\n                } else if (enlargement === minEnlargement) {\n                    // otherwise choose one with the smallest area\n                    if (area < minArea) {\n                        minArea = area;\n                        targetNode = child;\n                    }\n                }\n            }\n\n            node = targetNode || node.children[0];\n        }\n\n        return node;\n    },\n\n    _insert: function (item, level, isNode) {\n\n        var toBBox = this.toBBox,\n            bbox = isNode ? item : toBBox(item),\n            insertPath = [];\n\n        // find the best node for accommodating the item, saving all nodes along the path too\n        var node = this._chooseSubtree(bbox, this.data, level, insertPath);\n\n        // put the item into the node\n        node.children.push(item);\n        extend(node, bbox);\n\n        // split on node overflow; propagate upwards if necessary\n        while (level >= 0) {\n            if (insertPath[level].children.length > this._maxEntries) {\n                this._split(insertPath, level);\n                level--;\n            } else break;\n        }\n\n        // adjust bboxes along the insertion path\n        this._adjustParentBBoxes(bbox, insertPath, level);\n    },\n\n    // split overflowed node into two\n    _split: function (insertPath, level) {\n\n        var node = insertPath[level],\n            M = node.children.length,\n            m = this._minEntries;\n\n        this._chooseSplitAxis(node, m, M);\n\n        var splitIndex = this._chooseSplitIndex(node, m, M);\n\n        var newNode = createNode(node.children.splice(splitIndex, node.children.length - splitIndex));\n        newNode.height = node.height;\n        newNode.leaf = node.leaf;\n\n        calcBBox(node, this.toBBox);\n        calcBBox(newNode, this.toBBox);\n\n        if (level) insertPath[level - 1].children.push(newNode);\n        else this._splitRoot(node, newNode);\n    },\n\n    _splitRoot: function (node, newNode) {\n        // split root node\n        this.data = createNode([node, newNode]);\n        this.data.height = node.height + 1;\n        this.data.leaf = false;\n        calcBBox(this.data, this.toBBox);\n    },\n\n    _chooseSplitIndex: function (node, m, M) {\n\n        var i, bbox1, bbox2, overlap, area, minOverlap, minArea, index;\n\n        minOverlap = minArea = Infinity;\n\n        for (i = m; i <= M - m; i++) {\n            bbox1 = distBBox(node, 0, i, this.toBBox);\n            bbox2 = distBBox(node, i, M, this.toBBox);\n\n            overlap = intersectionArea(bbox1, bbox2);\n            area = bboxArea(bbox1) + bboxArea(bbox2);\n\n            // choose distribution with minimum overlap\n            if (overlap < minOverlap) {\n                minOverlap = overlap;\n                index = i;\n\n                minArea = area < minArea ? area : minArea;\n\n            } else if (overlap === minOverlap) {\n                // otherwise choose distribution with minimum area\n                if (area < minArea) {\n                    minArea = area;\n                    index = i;\n                }\n            }\n        }\n\n        return index;\n    },\n\n    // sorts node children by the best axis for split\n    _chooseSplitAxis: function (node, m, M) {\n\n        var compareMinX = node.leaf ? this.compareMinX : compareNodeMinX,\n            compareMinY = node.leaf ? this.compareMinY : compareNodeMinY,\n            xMargin = this._allDistMargin(node, m, M, compareMinX),\n            yMargin = this._allDistMargin(node, m, M, compareMinY);\n\n        // if total distributions margin value is minimal for x, sort by minX,\n        // otherwise it's already sorted by minY\n        if (xMargin < yMargin) node.children.sort(compareMinX);\n    },\n\n    // total margin of all possible split distributions where each node is at least m full\n    _allDistMargin: function (node, m, M, compare) {\n\n        node.children.sort(compare);\n\n        var toBBox = this.toBBox,\n            leftBBox = distBBox(node, 0, m, toBBox),\n            rightBBox = distBBox(node, M - m, M, toBBox),\n            margin = bboxMargin(leftBBox) + bboxMargin(rightBBox),\n            i, child;\n\n        for (i = m; i < M - m; i++) {\n            child = node.children[i];\n            extend(leftBBox, node.leaf ? toBBox(child) : child);\n            margin += bboxMargin(leftBBox);\n        }\n\n        for (i = M - m - 1; i >= m; i--) {\n            child = node.children[i];\n            extend(rightBBox, node.leaf ? toBBox(child) : child);\n            margin += bboxMargin(rightBBox);\n        }\n\n        return margin;\n    },\n\n    _adjustParentBBoxes: function (bbox, path, level) {\n        // adjust bboxes along the given tree path\n        for (var i = level; i >= 0; i--) {\n            extend(path[i], bbox);\n        }\n    },\n\n    _condense: function (path) {\n        // go through the path, removing empty nodes and updating bboxes\n        for (var i = path.length - 1, siblings; i >= 0; i--) {\n            if (path[i].children.length === 0) {\n                if (i > 0) {\n                    siblings = path[i - 1].children;\n                    siblings.splice(siblings.indexOf(path[i]), 1);\n\n                } else this.clear();\n\n            } else calcBBox(path[i], this.toBBox);\n        }\n    },\n\n    _initFormat: function (format) {\n        // data format (minX, minY, maxX, maxY accessors)\n\n        // uses eval-type function compilation instead of just accepting a toBBox function\n        // because the algorithms are very sensitive to sorting functions performance,\n        // so they should be dead simple and without inner calls\n\n        var compareArr = ['return a', ' - b', ';'];\n\n        this.compareMinX = new Function('a', 'b', compareArr.join(format[0]));\n        this.compareMinY = new Function('a', 'b', compareArr.join(format[1]));\n\n        this.toBBox = new Function('a',\n            'return {minX: a' + format[0] +\n            ', minY: a' + format[1] +\n            ', maxX: a' + format[2] +\n            ', maxY: a' + format[3] + '};');\n    }\n};\n\nfunction findItem(item, items, equalsFn) {\n    if (!equalsFn) return items.indexOf(item);\n\n    for (var i = 0; i < items.length; i++) {\n        if (equalsFn(item, items[i])) return i;\n    }\n    return -1;\n}\n\n// calculate node's bbox from bboxes of its children\nfunction calcBBox(node, toBBox) {\n    distBBox(node, 0, node.children.length, toBBox, node);\n}\n\n// min bounding rectangle of node children from k to p-1\nfunction distBBox(node, k, p, toBBox, destNode) {\n    if (!destNode) destNode = createNode(null);\n    destNode.minX = Infinity;\n    destNode.minY = Infinity;\n    destNode.maxX = -Infinity;\n    destNode.maxY = -Infinity;\n\n    for (var i = k, child; i < p; i++) {\n        child = node.children[i];\n        extend(destNode, node.leaf ? toBBox(child) : child);\n    }\n\n    return destNode;\n}\n\nfunction extend(a, b) {\n    a.minX = Math.min(a.minX, b.minX);\n    a.minY = Math.min(a.minY, b.minY);\n    a.maxX = Math.max(a.maxX, b.maxX);\n    a.maxY = Math.max(a.maxY, b.maxY);\n    return a;\n}\n\nfunction compareNodeMinX(a, b) { return a.minX - b.minX; }\nfunction compareNodeMinY(a, b) { return a.minY - b.minY; }\n\nfunction bboxArea(a)   { return (a.maxX - a.minX) * (a.maxY - a.minY); }\nfunction bboxMargin(a) { return (a.maxX - a.minX) + (a.maxY - a.minY); }\n\nfunction enlargedArea(a, b) {\n    return (Math.max(b.maxX, a.maxX) - Math.min(b.minX, a.minX)) *\n           (Math.max(b.maxY, a.maxY) - Math.min(b.minY, a.minY));\n}\n\nfunction intersectionArea(a, b) {\n    var minX = Math.max(a.minX, b.minX),\n        minY = Math.max(a.minY, b.minY),\n        maxX = Math.min(a.maxX, b.maxX),\n        maxY = Math.min(a.maxY, b.maxY);\n\n    return Math.max(0, maxX - minX) *\n           Math.max(0, maxY - minY);\n}\n\nfunction contains(a, b) {\n    return a.minX <= b.minX &&\n           a.minY <= b.minY &&\n           b.maxX <= a.maxX &&\n           b.maxY <= a.maxY;\n}\n\nfunction intersects(a, b) {\n    return b.minX <= a.maxX &&\n           b.minY <= a.maxY &&\n           b.maxX >= a.minX &&\n           b.maxY >= a.minY;\n}\n\nfunction createNode(children) {\n    return {\n        children: children,\n        height: 1,\n        leaf: true,\n        minX: Infinity,\n        minY: Infinity,\n        maxX: -Infinity,\n        maxY: -Infinity\n    };\n}\n\n// sort an array so that items come in groups of n unsorted items, with groups sorted between each other;\n// combines selection algorithm with binary divide & conquer approach\n\nfunction multiSelect(arr, left, right, n, compare) {\n    var stack = [left, right],\n        mid;\n\n    while (stack.length) {\n        right = stack.pop();\n        left = stack.pop();\n\n        if (right - left <= n) continue;\n\n        mid = left + Math.ceil((right - left) / n / 2) * n;\n        quickselect(arr, mid, left, right, compare);\n\n        stack.push(left, mid, mid, right);\n    }\n}\n","/**\n * @module ol/structs/RBush\n */\nimport {getUid} from '../util.js';\nimport rbush from 'rbush';\nimport {createOrUpdate, equals} from '../extent.js';\nimport {isEmpty} from '../obj.js';\n\n/**\n * @typedef {Object} Entry\n * @property {number} minX\n * @property {number} minY\n * @property {number} maxX\n * @property {number} maxY\n * @property {Object} [value]\n */\n\n/**\n * @classdesc\n * Wrapper around the RBush by Vladimir Agafonkin.\n * See https://github.com/mourner/rbush.\n *\n * @template T\n */\nclass RBush {\n  /**\n   * @param {number=} opt_maxEntries Max entries.\n   */\n  constructor(opt_maxEntries) {\n\n    /**\n     * @private\n     */\n    this.rbush_ = rbush(opt_maxEntries, undefined);\n\n    /**\n     * A mapping between the objects added to this rbush wrapper\n     * and the objects that are actually added to the internal rbush.\n     * @private\n     * @type {Object<string, Entry>}\n     */\n    this.items_ = {};\n\n  }\n\n  /**\n   * Insert a value into the RBush.\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @param {T} value Value.\n   */\n  insert(extent, value) {\n    /** @type {Entry} */\n    const item = {\n      minX: extent[0],\n      minY: extent[1],\n      maxX: extent[2],\n      maxY: extent[3],\n      value: value\n    };\n\n    this.rbush_.insert(item);\n    this.items_[getUid(value)] = item;\n  }\n\n\n  /**\n   * Bulk-insert values into the RBush.\n   * @param {Array<import(\"../extent.js\").Extent>} extents Extents.\n   * @param {Array<T>} values Values.\n   */\n  load(extents, values) {\n    const items = new Array(values.length);\n    for (let i = 0, l = values.length; i < l; i++) {\n      const extent = extents[i];\n      const value = values[i];\n\n      /** @type {Entry} */\n      const item = {\n        minX: extent[0],\n        minY: extent[1],\n        maxX: extent[2],\n        maxY: extent[3],\n        value: value\n      };\n      items[i] = item;\n      this.items_[getUid(value)] = item;\n    }\n    this.rbush_.load(items);\n  }\n\n\n  /**\n   * Remove a value from the RBush.\n   * @param {T} value Value.\n   * @return {boolean} Removed.\n   */\n  remove(value) {\n    const uid = getUid(value);\n\n    // get the object in which the value was wrapped when adding to the\n    // internal rbush. then use that object to do the removal.\n    const item = this.items_[uid];\n    delete this.items_[uid];\n    return this.rbush_.remove(item) !== null;\n  }\n\n\n  /**\n   * Update the extent of a value in the RBush.\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @param {T} value Value.\n   */\n  update(extent, value) {\n    const item = this.items_[getUid(value)];\n    const bbox = [item.minX, item.minY, item.maxX, item.maxY];\n    if (!equals(bbox, extent)) {\n      this.remove(value);\n      this.insert(extent, value);\n    }\n  }\n\n\n  /**\n   * Return all values in the RBush.\n   * @return {Array<T>} All.\n   */\n  getAll() {\n    const items = this.rbush_.all();\n    return items.map(function(item) {\n      return item.value;\n    });\n  }\n\n\n  /**\n   * Return all values in the given extent.\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @return {Array<T>} All in extent.\n   */\n  getInExtent(extent) {\n    /** @type {Entry} */\n    const bbox = {\n      minX: extent[0],\n      minY: extent[1],\n      maxX: extent[2],\n      maxY: extent[3]\n    };\n    const items = this.rbush_.search(bbox);\n    return items.map(function(item) {\n      return item.value;\n    });\n  }\n\n\n  /**\n   * Calls a callback function with each value in the tree.\n   * If the callback returns a truthy value, this value is returned without\n   * checking the rest of the tree.\n   * @param {function(this: S, T): *} callback Callback.\n   * @param {S=} opt_this The object to use as `this` in `callback`.\n   * @return {*} Callback return value.\n   * @template S\n   */\n  forEach(callback, opt_this) {\n    return this.forEach_(this.getAll(), callback, opt_this);\n  }\n\n\n  /**\n   * Calls a callback function with each value in the provided extent.\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @param {function(this: S, T): *} callback Callback.\n   * @param {S=} opt_this The object to use as `this` in `callback`.\n   * @return {*} Callback return value.\n   * @template S\n   */\n  forEachInExtent(extent, callback, opt_this) {\n    return this.forEach_(this.getInExtent(extent), callback, opt_this);\n  }\n\n\n  /**\n   * @param {Array<T>} values Values.\n   * @param {function(this: S, T): *} callback Callback.\n   * @param {S=} opt_this The object to use as `this` in `callback`.\n   * @private\n   * @return {*} Callback return value.\n   * @template S\n   */\n  forEach_(values, callback, opt_this) {\n    let result;\n    for (let i = 0, l = values.length; i < l; i++) {\n      result = callback.call(opt_this, values[i]);\n      if (result) {\n        return result;\n      }\n    }\n    return result;\n  }\n\n\n  /**\n   * @return {boolean} Is empty.\n   */\n  isEmpty() {\n    return isEmpty(this.items_);\n  }\n\n\n  /**\n   * Remove all values from the RBush.\n   */\n  clear() {\n    this.rbush_.clear();\n    this.items_ = {};\n  }\n\n\n  /**\n   * @param {import(\"../extent.js\").Extent=} opt_extent Extent.\n   * @return {import(\"../extent.js\").Extent} Extent.\n   */\n  getExtent(opt_extent) {\n    const data = this.rbush_.toJSON();\n    return createOrUpdate(data.minX, data.minY, data.maxX, data.maxY, opt_extent);\n  }\n\n\n  /**\n   * @param {RBush} rbush R-Tree.\n   */\n  concat(rbush) {\n    this.rbush_.load(rbush.rbush_.all());\n    for (const i in rbush.items_) {\n      this.items_[i] = rbush.items_[i];\n    }\n  }\n\n}\n\n\nexport default RBush;\n","/**\n * @module ol/source/Vector\n */\n\nimport {getUid} from '../util.js';\nimport Collection from '../Collection.js';\nimport CollectionEventType from '../CollectionEventType.js';\nimport ObjectEventType from '../ObjectEventType.js';\nimport {extend} from '../array.js';\nimport {assert} from '../asserts.js';\nimport {listen, unlistenByKey} from '../events.js';\nimport Event from '../events/Event.js';\nimport EventType from '../events/EventType.js';\nimport {containsExtent, equals} from '../extent.js';\nimport {xhr} from '../featureloader.js';\nimport {TRUE, VOID} from '../functions.js';\nimport {all as allStrategy} from '../loadingstrategy.js';\nimport {isEmpty, getValues} from '../obj.js';\nimport Source from './Source.js';\nimport SourceState from './State.js';\nimport VectorEventType from './VectorEventType.js';\nimport RBush from '../structs/RBush.js';\n\n/**\n * A function that takes an {@link module:ol/extent~Extent} and a resolution as arguments, and\n * returns an array of {@link module:ol/extent~Extent} with the extents to load. Usually this\n * is one of the standard {@link module:ol/loadingstrategy} strategies.\n *\n * @typedef {function(import(\"../extent.js\").Extent, number): Array<import(\"../extent.js\").Extent>} LoadingStrategy\n * @api\n */\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/source/Vector} instances are instances of this\n * type.\n */\nexport class VectorSourceEvent extends Event {\n\n  /**\n   * @param {string} type Type.\n   * @param {import(\"../Feature.js\").default=} opt_feature Feature.\n   */\n  constructor(type, opt_feature) {\n\n    super(type);\n\n    /**\n     * The feature being added or removed.\n     * @type {import(\"../Feature.js\").default|undefined}\n     * @api\n     */\n    this.feature = opt_feature;\n\n  }\n\n}\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"./Source.js\").AttributionLike} [attributions] Attributions.\n * @property {Array<import(\"../Feature.js\").default>|Collection<import(\"../Feature.js\").default>} [features]\n * Features. If provided as {@link module:ol/Collection}, the features in the source\n * and the collection will stay in sync.\n * @property {import(\"../format/Feature.js\").default} [format] The feature format used by the XHR\n * feature loader when `url` is set. Required if `url` is set, otherwise ignored.\n * @property {import(\"../featureloader.js\").FeatureLoader} [loader]\n * The loader function used to load features, from a remote source for example.\n * If this is not set and `url` is set, the source will create and use an XHR\n * feature loader.\n *\n * Example:\n *\n * ```js\n * import {Vector} from 'ol/source';\n * import {GeoJSON} from 'ol/format';\n * import {bbox} from 'ol/loadingstrategy';\n *\n * var vectorSource = new Vector({\n *   format: new GeoJSON(),\n *   loader: function(extent, resolution, projection) {\n *      var proj = projection.getCode();\n *      var url = 'https://ahocevar.com/geoserver/wfs?service=WFS&' +\n *          'version=1.1.0&request=GetFeature&typename=osm:water_areas&' +\n *          'outputFormat=application/json&srsname=' + proj + '&' +\n *          'bbox=' + extent.join(',') + ',' + proj;\n *      var xhr = new XMLHttpRequest();\n *      xhr.open('GET', url);\n *      var onError = function() {\n *        vectorSource.removeLoadedExtent(extent);\n *      }\n *      xhr.onerror = onError;\n *      xhr.onload = function() {\n *        if (xhr.status == 200) {\n *          vectorSource.addFeatures(\n *              vectorSource.getFormat().readFeatures(xhr.responseText));\n *        } else {\n *          onError();\n *        }\n *      }\n *      xhr.send();\n *    },\n *    strategy: bbox\n *  });\n * ```\n * @property {boolean} [overlaps=true] This source may have overlapping geometries.\n * Setting this to `false` (e.g. for sources with polygons that represent administrative\n * boundaries or TopoJSON sources) allows the renderer to optimise fill and\n * stroke operations.\n * @property {LoadingStrategy} [strategy] The loading strategy to use.\n * By default an {@link module:ol/loadingstrategy~all}\n * strategy is used, a one-off strategy which loads all features at once.\n * @property {string|import(\"../featureloader.js\").FeatureUrlFunction} [url]\n * Setting this option instructs the source to load features using an XHR loader\n * (see {@link module:ol/featureloader~xhr}). Use a `string` and an\n * {@link module:ol/loadingstrategy~all} for a one-off download of all features from\n * the given URL. Use a {@link module:ol/featureloader~FeatureUrlFunction} to generate the url with\n * other loading strategies.\n * Requires `format` to be set as well.\n * When default XHR feature loader is provided, the features will\n * be transformed from the data projection to the view projection\n * during parsing. If your remote data source does not advertise its projection\n * properly, this transformation will be incorrect. For some formats, the\n * default projection (usually EPSG:4326) can be overridden by setting the\n * dataProjection constructor option on the format.\n * Note that if a source contains non-feature data, such as a GeoJSON geometry\n * or a KML NetworkLink, these will be ignored. Use a custom loader to load these.\n * @property {boolean} [useSpatialIndex=true]\n * By default, an RTree is used as spatial index. When features are removed and\n * added frequently, and the total number of features is low, setting this to\n * `false` may improve performance.\n *\n * Note that\n * {@link module:ol/source/Vector~VectorSource#getFeaturesInExtent},\n * {@link module:ol/source/Vector~VectorSource#getClosestFeatureToCoordinate} and\n * {@link module:ol/source/Vector~VectorSource#getExtent} cannot be used when `useSpatialIndex` is\n * set to `false`, and {@link module:ol/source/Vector~VectorSource#forEachFeatureInExtent} will loop\n * through all features.\n *\n * When set to `false`, the features will be maintained in an\n * {@link module:ol/Collection}, which can be retrieved through\n * {@link module:ol/source/Vector~VectorSource#getFeaturesCollection}.\n * @property {boolean} [wrapX=true] Wrap the world horizontally. For vector editing across the\n * -180° and 180° meridians to work properly, this should be set to `false`. The\n * resulting geometry coordinates will then exceed the world bounds.\n */\n\n\n/**\n * @classdesc\n * Provides a source of features for vector layers. Vector features provided\n * by this source are suitable for editing. See {@link module:ol/source/VectorTile~VectorTile} for\n * vector data that is optimized for rendering.\n *\n * @fires ol/source/Vector.VectorSourceEvent\n * @api\n */\nclass VectorSource extends Source {\n  /**\n   * @param {Options=} opt_options Vector source options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    super({\n      attributions: options.attributions,\n      projection: undefined,\n      state: SourceState.READY,\n      wrapX: options.wrapX !== undefined ? options.wrapX : true\n    });\n\n    /**\n     * @private\n     * @type {import(\"../featureloader.js\").FeatureLoader}\n     */\n    this.loader_ = VOID;\n\n    /**\n     * @private\n     * @type {import(\"../format/Feature.js\").default|undefined}\n     */\n    this.format_ = options.format;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.overlaps_ = options.overlaps == undefined ? true : options.overlaps;\n\n    /**\n     * @private\n     * @type {string|import(\"../featureloader.js\").FeatureUrlFunction|undefined}\n     */\n    this.url_ = options.url;\n\n    if (options.loader !== undefined) {\n      this.loader_ = options.loader;\n    } else if (this.url_ !== undefined) {\n      assert(this.format_, 7); // `format` must be set when `url` is set\n      // create a XHR feature loader for \"url\" and \"format\"\n      this.loader_ = xhr(this.url_, /** @type {import(\"../format/Feature.js\").default} */ (this.format_));\n    }\n\n    /**\n     * @private\n     * @type {LoadingStrategy}\n     */\n    this.strategy_ = options.strategy !== undefined ? options.strategy : allStrategy;\n\n    const useSpatialIndex =\n        options.useSpatialIndex !== undefined ? options.useSpatialIndex : true;\n\n    /**\n     * @private\n     * @type {RBush<import(\"../Feature.js\").default>}\n     */\n    this.featuresRtree_ = useSpatialIndex ? new RBush() : null;\n\n    /**\n     * @private\n     * @type {RBush<{extent: import(\"../extent.js\").Extent}>}\n     */\n    this.loadedExtentsRtree_ = new RBush();\n\n    /**\n     * @private\n     * @type {!Object<string, import(\"../Feature.js\").default>}\n     */\n    this.nullGeometryFeatures_ = {};\n\n    /**\n     * A lookup of features by id (the return from feature.getId()).\n     * @private\n     * @type {!Object<string, import(\"../Feature.js\").default>}\n     */\n    this.idIndex_ = {};\n\n    /**\n     * A lookup of features without id (keyed by getUid(feature)).\n     * @private\n     * @type {!Object<string, import(\"../Feature.js\").default>}\n     */\n    this.undefIdIndex_ = {};\n\n    /**\n     * @private\n     * @type {Object<string, Array<import(\"../events.js\").EventsKey>>}\n     */\n    this.featureChangeKeys_ = {};\n\n    /**\n     * @private\n     * @type {Collection<import(\"../Feature.js\").default>}\n     */\n    this.featuresCollection_ = null;\n\n    let collection, features;\n    if (Array.isArray(options.features)) {\n      features = options.features;\n    } else if (options.features) {\n      collection = options.features;\n      features = collection.getArray();\n    }\n    if (!useSpatialIndex && collection === undefined) {\n      collection = new Collection(features);\n    }\n    if (features !== undefined) {\n      this.addFeaturesInternal(features);\n    }\n    if (collection !== undefined) {\n      this.bindFeaturesCollection_(collection);\n    }\n\n  }\n\n  /**\n   * Add a single feature to the source.  If you want to add a batch of features\n   * at once, call {@link module:ol/source/Vector~VectorSource#addFeatures #addFeatures()}\n   * instead. A feature will not be added to the source if feature with\n   * the same id is already there. The reason for this behavior is to avoid\n   * feature duplication when using bbox or tile loading strategies.\n   * @param {import(\"../Feature.js\").default} feature Feature to add.\n   * @api\n   */\n  addFeature(feature) {\n    this.addFeatureInternal(feature);\n    this.changed();\n  }\n\n\n  /**\n   * Add a feature without firing a `change` event.\n   * @param {import(\"../Feature.js\").default} feature Feature.\n   * @protected\n   */\n  addFeatureInternal(feature) {\n    const featureKey = getUid(feature);\n\n    if (!this.addToIndex_(featureKey, feature)) {\n      return;\n    }\n\n    this.setupChangeEvents_(featureKey, feature);\n\n    const geometry = feature.getGeometry();\n    if (geometry) {\n      const extent = geometry.getExtent();\n      if (this.featuresRtree_) {\n        this.featuresRtree_.insert(extent, feature);\n      }\n    } else {\n      this.nullGeometryFeatures_[featureKey] = feature;\n    }\n\n    this.dispatchEvent(\n      new VectorSourceEvent(VectorEventType.ADDFEATURE, feature));\n  }\n\n\n  /**\n   * @param {string} featureKey Unique identifier for the feature.\n   * @param {import(\"../Feature.js\").default} feature The feature.\n   * @private\n   */\n  setupChangeEvents_(featureKey, feature) {\n    this.featureChangeKeys_[featureKey] = [\n      listen(feature, EventType.CHANGE,\n        this.handleFeatureChange_, this),\n      listen(feature, ObjectEventType.PROPERTYCHANGE,\n        this.handleFeatureChange_, this)\n    ];\n  }\n\n\n  /**\n   * @param {string} featureKey Unique identifier for the feature.\n   * @param {import(\"../Feature.js\").default} feature The feature.\n   * @return {boolean} The feature is \"valid\", in the sense that it is also a\n   *     candidate for insertion into the Rtree.\n   * @private\n   */\n  addToIndex_(featureKey, feature) {\n    let valid = true;\n    const id = feature.getId();\n    if (id !== undefined) {\n      if (!(id.toString() in this.idIndex_)) {\n        this.idIndex_[id.toString()] = feature;\n      } else {\n        valid = false;\n      }\n    } else {\n      assert(!(featureKey in this.undefIdIndex_),\n        30); // The passed `feature` was already added to the source\n      this.undefIdIndex_[featureKey] = feature;\n    }\n    return valid;\n  }\n\n\n  /**\n   * Add a batch of features to the source.\n   * @param {Array<import(\"../Feature.js\").default>} features Features to add.\n   * @api\n   */\n  addFeatures(features) {\n    this.addFeaturesInternal(features);\n    this.changed();\n  }\n\n\n  /**\n   * Add features without firing a `change` event.\n   * @param {Array<import(\"../Feature.js\").default>} features Features.\n   * @protected\n   */\n  addFeaturesInternal(features) {\n    const extents = [];\n    const newFeatures = [];\n    const geometryFeatures = [];\n\n    for (let i = 0, length = features.length; i < length; i++) {\n      const feature = features[i];\n      const featureKey = getUid(feature);\n      if (this.addToIndex_(featureKey, feature)) {\n        newFeatures.push(feature);\n      }\n    }\n\n    for (let i = 0, length = newFeatures.length; i < length; i++) {\n      const feature = newFeatures[i];\n      const featureKey = getUid(feature);\n      this.setupChangeEvents_(featureKey, feature);\n\n      const geometry = feature.getGeometry();\n      if (geometry) {\n        const extent = geometry.getExtent();\n        extents.push(extent);\n        geometryFeatures.push(feature);\n      } else {\n        this.nullGeometryFeatures_[featureKey] = feature;\n      }\n    }\n    if (this.featuresRtree_) {\n      this.featuresRtree_.load(extents, geometryFeatures);\n    }\n\n    for (let i = 0, length = newFeatures.length; i < length; i++) {\n      this.dispatchEvent(new VectorSourceEvent(VectorEventType.ADDFEATURE, newFeatures[i]));\n    }\n  }\n\n\n  /**\n   * @param {!Collection<import(\"../Feature.js\").default>} collection Collection.\n   * @private\n   */\n  bindFeaturesCollection_(collection) {\n    let modifyingCollection = false;\n    listen(this, VectorEventType.ADDFEATURE,\n      /**\n       * @param {VectorSourceEvent} evt The vector source event\n       */\n      function(evt) {\n        if (!modifyingCollection) {\n          modifyingCollection = true;\n          collection.push(evt.feature);\n          modifyingCollection = false;\n        }\n      });\n    listen(this, VectorEventType.REMOVEFEATURE,\n      /**\n       * @param {VectorSourceEvent} evt The vector source event\n       */\n      function(evt) {\n        if (!modifyingCollection) {\n          modifyingCollection = true;\n          collection.remove(evt.feature);\n          modifyingCollection = false;\n        }\n      });\n    listen(collection, CollectionEventType.ADD,\n      /**\n       * @param {import(\"../Collection.js\").CollectionEvent} evt The collection event\n       */\n      function(evt) {\n        if (!modifyingCollection) {\n          modifyingCollection = true;\n          this.addFeature(/** @type {import(\"../Feature.js\").default} */ (evt.element));\n          modifyingCollection = false;\n        }\n      }, this);\n    listen(collection, CollectionEventType.REMOVE,\n      /**\n       * @param {import(\"../Collection.js\").CollectionEvent} evt The collection event\n       */\n      function(evt) {\n        if (!modifyingCollection) {\n          modifyingCollection = true;\n          this.removeFeature(/** @type {import(\"../Feature.js\").default} */ (evt.element));\n          modifyingCollection = false;\n        }\n      }, this);\n    this.featuresCollection_ = collection;\n  }\n\n\n  /**\n   * Remove all features from the source.\n   * @param {boolean=} opt_fast Skip dispatching of {@link module:ol/source/Vector.VectorSourceEvent#removefeature} events.\n   * @api\n   */\n  clear(opt_fast) {\n    if (opt_fast) {\n      for (const featureId in this.featureChangeKeys_) {\n        const keys = this.featureChangeKeys_[featureId];\n        keys.forEach(unlistenByKey);\n      }\n      if (!this.featuresCollection_) {\n        this.featureChangeKeys_ = {};\n        this.idIndex_ = {};\n        this.undefIdIndex_ = {};\n      }\n    } else {\n      if (this.featuresRtree_) {\n        this.featuresRtree_.forEach(this.removeFeatureInternal, this);\n        for (const id in this.nullGeometryFeatures_) {\n          this.removeFeatureInternal(this.nullGeometryFeatures_[id]);\n        }\n      }\n    }\n    if (this.featuresCollection_) {\n      this.featuresCollection_.clear();\n    }\n\n    if (this.featuresRtree_) {\n      this.featuresRtree_.clear();\n    }\n    this.loadedExtentsRtree_.clear();\n    this.nullGeometryFeatures_ = {};\n\n    const clearEvent = new VectorSourceEvent(VectorEventType.CLEAR);\n    this.dispatchEvent(clearEvent);\n    this.changed();\n  }\n\n\n  /**\n   * Iterate through all features on the source, calling the provided callback\n   * with each one.  If the callback returns any \"truthy\" value, iteration will\n   * stop and the function will return the same value.\n   * Note: this function only iterate through the feature that have a defined geometry.\n   *\n   * @param {function(import(\"../Feature.js\").default): T} callback Called with each feature\n   *     on the source.  Return a truthy value to stop iteration.\n   * @return {T|undefined} The return value from the last call to the callback.\n   * @template T\n   * @api\n   */\n  forEachFeature(callback) {\n    if (this.featuresRtree_) {\n      return this.featuresRtree_.forEach(callback);\n    } else if (this.featuresCollection_) {\n      this.featuresCollection_.forEach(callback);\n    }\n  }\n\n\n  /**\n   * Iterate through all features whose geometries contain the provided\n   * coordinate, calling the callback with each feature.  If the callback returns\n   * a \"truthy\" value, iteration will stop and the function will return the same\n   * value.\n   *\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {function(import(\"../Feature.js\").default): T} callback Called with each feature\n   *     whose goemetry contains the provided coordinate.\n   * @return {T|undefined} The return value from the last call to the callback.\n   * @template T\n   */\n  forEachFeatureAtCoordinateDirect(coordinate, callback) {\n    const extent = [coordinate[0], coordinate[1], coordinate[0], coordinate[1]];\n    return this.forEachFeatureInExtent(extent, function(feature) {\n      const geometry = feature.getGeometry();\n      if (geometry.intersectsCoordinate(coordinate)) {\n        return callback(feature);\n      } else {\n        return undefined;\n      }\n    });\n  }\n\n\n  /**\n   * Iterate through all features whose bounding box intersects the provided\n   * extent (note that the feature's geometry may not intersect the extent),\n   * calling the callback with each feature.  If the callback returns a \"truthy\"\n   * value, iteration will stop and the function will return the same value.\n   *\n   * If you are interested in features whose geometry intersects an extent, call\n   * the {@link module:ol/source/Vector~VectorSource#forEachFeatureIntersectingExtent #forEachFeatureIntersectingExtent()} method instead.\n   *\n   * When `useSpatialIndex` is set to false, this method will loop through all\n   * features, equivalent to {@link module:ol/source/Vector~VectorSource#forEachFeature #forEachFeature()}.\n   *\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @param {function(import(\"../Feature.js\").default): T} callback Called with each feature\n   *     whose bounding box intersects the provided extent.\n   * @return {T|undefined} The return value from the last call to the callback.\n   * @template T\n   * @api\n   */\n  forEachFeatureInExtent(extent, callback) {\n    if (this.featuresRtree_) {\n      return this.featuresRtree_.forEachInExtent(extent, callback);\n    } else if (this.featuresCollection_) {\n      this.featuresCollection_.forEach(callback);\n    }\n  }\n\n\n  /**\n   * Iterate through all features whose geometry intersects the provided extent,\n   * calling the callback with each feature.  If the callback returns a \"truthy\"\n   * value, iteration will stop and the function will return the same value.\n   *\n   * If you only want to test for bounding box intersection, call the\n   * {@link module:ol/source/Vector~VectorSource#forEachFeatureInExtent #forEachFeatureInExtent()} method instead.\n   *\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @param {function(import(\"../Feature.js\").default): T} callback Called with each feature\n   *     whose geometry intersects the provided extent.\n   * @return {T|undefined} The return value from the last call to the callback.\n   * @template T\n   * @api\n   */\n  forEachFeatureIntersectingExtent(extent, callback) {\n    return this.forEachFeatureInExtent(extent,\n      /**\n       * @param {import(\"../Feature.js\").default} feature Feature.\n       * @return {T|undefined} The return value from the last call to the callback.\n       */\n      function(feature) {\n        const geometry = feature.getGeometry();\n        if (geometry.intersectsExtent(extent)) {\n          const result = callback(feature);\n          if (result) {\n            return result;\n          }\n        }\n      });\n  }\n\n\n  /**\n   * Get the features collection associated with this source. Will be `null`\n   * unless the source was configured with `useSpatialIndex` set to `false`, or\n   * with an {@link module:ol/Collection} as `features`.\n   * @return {Collection<import(\"../Feature.js\").default>} The collection of features.\n   * @api\n   */\n  getFeaturesCollection() {\n    return this.featuresCollection_;\n  }\n\n\n  /**\n   * Get all features on the source in random order.\n   * @return {Array<import(\"../Feature.js\").default>} Features.\n   * @api\n   */\n  getFeatures() {\n    let features;\n    if (this.featuresCollection_) {\n      features = this.featuresCollection_.getArray();\n    } else if (this.featuresRtree_) {\n      features = this.featuresRtree_.getAll();\n      if (!isEmpty(this.nullGeometryFeatures_)) {\n        extend(features, getValues(this.nullGeometryFeatures_));\n      }\n    }\n    return (\n      /** @type {Array<import(\"../Feature.js\").default>} */ (features)\n    );\n  }\n\n\n  /**\n   * Get all features whose geometry intersects the provided coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @return {Array<import(\"../Feature.js\").default>} Features.\n   * @api\n   */\n  getFeaturesAtCoordinate(coordinate) {\n    const features = [];\n    this.forEachFeatureAtCoordinateDirect(coordinate, function(feature) {\n      features.push(feature);\n    });\n    return features;\n  }\n\n\n  /**\n   * Get all features in the provided extent.  Note that this returns an array of\n   * all features intersecting the given extent in random order (so it may include\n   * features whose geometries do not intersect the extent).\n   *\n   * This method is not available when the source is configured with\n   * `useSpatialIndex` set to `false`.\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @return {Array<import(\"../Feature.js\").default>} Features.\n   * @api\n   */\n  getFeaturesInExtent(extent) {\n    return this.featuresRtree_.getInExtent(extent);\n  }\n\n\n  /**\n   * Get the closest feature to the provided coordinate.\n   *\n   * This method is not available when the source is configured with\n   * `useSpatialIndex` set to `false`.\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {function(import(\"../Feature.js\").default):boolean=} opt_filter Feature filter function.\n   *     The filter function will receive one argument, the {@link module:ol/Feature feature}\n   *     and it should return a boolean value. By default, no filtering is made.\n   * @return {import(\"../Feature.js\").default} Closest feature.\n   * @api\n   */\n  getClosestFeatureToCoordinate(coordinate, opt_filter) {\n    // Find the closest feature using branch and bound.  We start searching an\n    // infinite extent, and find the distance from the first feature found.  This\n    // becomes the closest feature.  We then compute a smaller extent which any\n    // closer feature must intersect.  We continue searching with this smaller\n    // extent, trying to find a closer feature.  Every time we find a closer\n    // feature, we update the extent being searched so that any even closer\n    // feature must intersect it.  We continue until we run out of features.\n    const x = coordinate[0];\n    const y = coordinate[1];\n    let closestFeature = null;\n    const closestPoint = [NaN, NaN];\n    let minSquaredDistance = Infinity;\n    const extent = [-Infinity, -Infinity, Infinity, Infinity];\n    const filter = opt_filter ? opt_filter : TRUE;\n    this.featuresRtree_.forEachInExtent(extent,\n      /**\n       * @param {import(\"../Feature.js\").default} feature Feature.\n       */\n      function(feature) {\n        if (filter(feature)) {\n          const geometry = feature.getGeometry();\n          const previousMinSquaredDistance = minSquaredDistance;\n          minSquaredDistance = geometry.closestPointXY(\n            x, y, closestPoint, minSquaredDistance);\n          if (minSquaredDistance < previousMinSquaredDistance) {\n            closestFeature = feature;\n            // This is sneaky.  Reduce the extent that it is currently being\n            // searched while the R-Tree traversal using this same extent object\n            // is still in progress.  This is safe because the new extent is\n            // strictly contained by the old extent.\n            const minDistance = Math.sqrt(minSquaredDistance);\n            extent[0] = x - minDistance;\n            extent[1] = y - minDistance;\n            extent[2] = x + minDistance;\n            extent[3] = y + minDistance;\n          }\n        }\n      });\n    return closestFeature;\n  }\n\n\n  /**\n   * Get the extent of the features currently in the source.\n   *\n   * This method is not available when the source is configured with\n   * `useSpatialIndex` set to `false`.\n   * @param {import(\"../extent.js\").Extent=} opt_extent Destination extent. If provided, no new extent\n   *     will be created. Instead, that extent's coordinates will be overwritten.\n   * @return {import(\"../extent.js\").Extent} Extent.\n   * @api\n   */\n  getExtent(opt_extent) {\n    return this.featuresRtree_.getExtent(opt_extent);\n  }\n\n\n  /**\n   * Get a feature by its identifier (the value returned by feature.getId()).\n   * Note that the index treats string and numeric identifiers as the same.  So\n   * `source.getFeatureById(2)` will return a feature with id `'2'` or `2`.\n   *\n   * @param {string|number} id Feature identifier.\n   * @return {import(\"../Feature.js\").default} The feature (or `null` if not found).\n   * @api\n   */\n  getFeatureById(id) {\n    const feature = this.idIndex_[id.toString()];\n    return feature !== undefined ? feature : null;\n  }\n\n\n  /**\n   * Get the format associated with this source.\n   *\n   * @return {import(\"../format/Feature.js\").default|undefined} The feature format.\n   * @api\n   */\n  getFormat() {\n    return this.format_;\n  }\n\n\n  /**\n   * @return {boolean} The source can have overlapping geometries.\n   */\n  getOverlaps() {\n    return this.overlaps_;\n  }\n\n\n  /**\n   * Get the url associated with this source.\n   *\n   * @return {string|import(\"../featureloader.js\").FeatureUrlFunction|undefined} The url.\n   * @api\n   */\n  getUrl() {\n    return this.url_;\n  }\n\n\n  /**\n   * @param {Event} event Event.\n   * @private\n   */\n  handleFeatureChange_(event) {\n    const feature = /** @type {import(\"../Feature.js\").default} */ (event.target);\n    const featureKey = getUid(feature);\n    const geometry = feature.getGeometry();\n    if (!geometry) {\n      if (!(featureKey in this.nullGeometryFeatures_)) {\n        if (this.featuresRtree_) {\n          this.featuresRtree_.remove(feature);\n        }\n        this.nullGeometryFeatures_[featureKey] = feature;\n      }\n    } else {\n      const extent = geometry.getExtent();\n      if (featureKey in this.nullGeometryFeatures_) {\n        delete this.nullGeometryFeatures_[featureKey];\n        if (this.featuresRtree_) {\n          this.featuresRtree_.insert(extent, feature);\n        }\n      } else {\n        if (this.featuresRtree_) {\n          this.featuresRtree_.update(extent, feature);\n        }\n      }\n    }\n    const id = feature.getId();\n    if (id !== undefined) {\n      const sid = id.toString();\n      if (featureKey in this.undefIdIndex_) {\n        delete this.undefIdIndex_[featureKey];\n        this.idIndex_[sid] = feature;\n      } else {\n        if (this.idIndex_[sid] !== feature) {\n          this.removeFromIdIndex_(feature);\n          this.idIndex_[sid] = feature;\n        }\n      }\n    } else {\n      if (!(featureKey in this.undefIdIndex_)) {\n        this.removeFromIdIndex_(feature);\n        this.undefIdIndex_[featureKey] = feature;\n      }\n    }\n    this.changed();\n    this.dispatchEvent(new VectorSourceEvent(\n      VectorEventType.CHANGEFEATURE, feature));\n  }\n\n  /**\n   * Returns true if the feature is contained within the source.\n   * @param {import(\"../Feature.js\").default} feature Feature.\n   * @return {boolean} Has feature.\n   * @api\n   */\n  hasFeature(feature) {\n    const id = feature.getId();\n    if (id !== undefined) {\n      return id in this.idIndex_;\n    } else {\n      return getUid(feature) in this.undefIdIndex_;\n    }\n  }\n\n  /**\n   * @return {boolean} Is empty.\n   */\n  isEmpty() {\n    return this.featuresRtree_.isEmpty() && isEmpty(this.nullGeometryFeatures_);\n  }\n\n\n  /**\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @param {number} resolution Resolution.\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   */\n  loadFeatures(extent, resolution, projection) {\n    const loadedExtentsRtree = this.loadedExtentsRtree_;\n    const extentsToLoad = this.strategy_(extent, resolution);\n    this.loading = false;\n    for (let i = 0, ii = extentsToLoad.length; i < ii; ++i) {\n      const extentToLoad = extentsToLoad[i];\n      const alreadyLoaded = loadedExtentsRtree.forEachInExtent(extentToLoad,\n        /**\n         * @param {{extent: import(\"../extent.js\").Extent}} object Object.\n         * @return {boolean} Contains.\n         */\n        function(object) {\n          return containsExtent(object.extent, extentToLoad);\n        });\n      if (!alreadyLoaded) {\n        this.loader_.call(this, extentToLoad, resolution, projection);\n        loadedExtentsRtree.insert(extentToLoad, {extent: extentToLoad.slice()});\n        this.loading = this.loader_ !== VOID;\n      }\n    }\n  }\n\n\n  /**\n   * Remove an extent from the list of loaded extents.\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @api\n   */\n  removeLoadedExtent(extent) {\n    const loadedExtentsRtree = this.loadedExtentsRtree_;\n    let obj;\n    loadedExtentsRtree.forEachInExtent(extent, function(object) {\n      if (equals(object.extent, extent)) {\n        obj = object;\n        return true;\n      }\n    });\n    if (obj) {\n      loadedExtentsRtree.remove(obj);\n    }\n  }\n\n\n  /**\n   * Remove a single feature from the source.  If you want to remove all features\n   * at once, use the {@link module:ol/source/Vector~VectorSource#clear #clear()} method\n   * instead.\n   * @param {import(\"../Feature.js\").default} feature Feature to remove.\n   * @api\n   */\n  removeFeature(feature) {\n    const featureKey = getUid(feature);\n    if (featureKey in this.nullGeometryFeatures_) {\n      delete this.nullGeometryFeatures_[featureKey];\n    } else {\n      if (this.featuresRtree_) {\n        this.featuresRtree_.remove(feature);\n      }\n    }\n    this.removeFeatureInternal(feature);\n    this.changed();\n  }\n\n\n  /**\n   * Remove feature without firing a `change` event.\n   * @param {import(\"../Feature.js\").default} feature Feature.\n   * @protected\n   */\n  removeFeatureInternal(feature) {\n    const featureKey = getUid(feature);\n    this.featureChangeKeys_[featureKey].forEach(unlistenByKey);\n    delete this.featureChangeKeys_[featureKey];\n    const id = feature.getId();\n    if (id !== undefined) {\n      delete this.idIndex_[id.toString()];\n    } else {\n      delete this.undefIdIndex_[featureKey];\n    }\n    this.dispatchEvent(new VectorSourceEvent(\n      VectorEventType.REMOVEFEATURE, feature));\n  }\n\n\n  /**\n   * Remove a feature from the id index.  Called internally when the feature id\n   * may have changed.\n   * @param {import(\"../Feature.js\").default} feature The feature.\n   * @return {boolean} Removed the feature from the index.\n   * @private\n   */\n  removeFromIdIndex_(feature) {\n    let removed = false;\n    for (const id in this.idIndex_) {\n      if (this.idIndex_[id] === feature) {\n        delete this.idIndex_[id];\n        removed = true;\n        break;\n      }\n    }\n    return removed;\n  }\n\n\n  /**\n   * Set the new loader of the source. The next loadFeatures call will use the\n   * new loader.\n   * @param {import(\"../featureloader.js\").FeatureLoader} loader The loader to set.\n   * @api\n   */\n  setLoader(loader) {\n    this.loader_ = loader;\n  }\n\n}\n\n\nexport default VectorSource;\n","/**\n * @module ol/interaction/Draw\n */\nimport EventType from '../events/EventType.js';\nimport Feature from '../Feature.js';\nimport MapBrowserEventType from '../MapBrowserEventType.js';\nimport MapBrowserPointerEvent from '../MapBrowserPointerEvent.js';\nimport {getChangeEventType} from '../Object.js';\nimport {squaredDistance as squaredCoordinateDistance} from '../coordinate.js';\nimport {listen} from '../events.js';\nimport Event from '../events/Event.js';\nimport {noModifierKeys, always, shiftKeyOnly} from '../events/condition.js';\nimport {boundingExtent, getBottomLeft, getBottomRight, getTopLeft, getTopRight} from '../extent.js';\nimport {TRUE, FALSE} from '../functions.js';\nimport Circle from '../geom/Circle.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport LineString from '../geom/LineString.js';\nimport MultiLineString from '../geom/MultiLineString.js';\nimport MultiPoint from '../geom/MultiPoint.js';\nimport MultiPolygon from '../geom/MultiPolygon.js';\nimport {POINTER_TYPE} from '../pointer/MouseSource.js';\nimport Point from '../geom/Point.js';\nimport Polygon, {fromCircle, makeRegular} from '../geom/Polygon.js';\nimport PointerInteraction from './Pointer.js';\nimport InteractionProperty from './Property.js';\nimport VectorLayer from '../layer/Vector.js';\nimport VectorSource from '../source/Vector.js';\nimport {createEditingStyle} from '../style/Style.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {GeometryType} type Geometry type of\n * the geometries being drawn with this instance.\n * @property {number} [clickTolerance=6] The maximum distance in pixels between\n * \"down\" and \"up\" for a \"up\" event to be considered a \"click\" event and\n * actually add a point/vertex to the geometry being drawn.  The default of `6`\n * was chosen for the draw interaction to behave correctly on mouse as well as\n * on touch devices.\n * @property {import(\"../Collection.js\").default<Feature>} [features]\n * Destination collection for the drawn features.\n * @property {VectorSource} [source] Destination source for\n * the drawn features.\n * @property {number} [dragVertexDelay=500] Delay in milliseconds after pointerdown\n * before the current vertex can be dragged to its exact position.\n * @property {number} [snapTolerance=12] Pixel distance for snapping to the\n * drawing finish.\n * @property {boolean} [stopClick=false] Stop click, singleclick, and\n * doubleclick events from firing during drawing.\n * @property {number} [maxPoints] The number of points that can be drawn before\n * a polygon ring or line string is finished. By default there is no\n * restriction.\n * @property {number} [minPoints] The number of points that must be drawn\n * before a polygon ring or line string can be finished. Default is `3` for\n * polygon rings and `2` for line strings.\n * @property {import(\"../events/condition.js\").Condition} [finishCondition] A function\n * that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether the drawing can be finished.\n * @property {import(\"../style/Style.js\").StyleLike} [style]\n * Style for sketch features.\n * @property {GeometryFunction} [geometryFunction]\n * Function that is called when a geometry's coordinates are updated.\n * @property {string} [geometryName] Geometry name to use for features created\n * by the draw interaction.\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled.\n * By default {@link module:ol/events/condition~noModifierKeys}, i.e. a click,\n * adds a vertex or deactivates freehand drawing.\n * @property {boolean} [freehand=false] Operate in freehand mode for lines,\n * polygons, and circles.  This makes the interaction always operate in freehand\n * mode and takes precedence over any `freehandCondition` option.\n * @property {import(\"../events/condition.js\").Condition} [freehandCondition]\n * Condition that activates freehand drawing for lines and polygons. This\n * function takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and\n * returns a boolean to indicate whether that event should be handled. The\n * default is {@link module:ol/events/condition~shiftKeyOnly}, meaning that the\n * Shift key activates freehand drawing.\n * @property {boolean} [wrapX=false] Wrap the world horizontally on the sketch\n * overlay.\n */\n\n\n/**\n * Coordinate type when drawing points.\n * @typedef {import(\"../coordinate.js\").Coordinate} PointCoordType\n */\n\n\n/**\n * Coordinate type when drawing lines.\n * @typedef {Array<import(\"../coordinate.js\").Coordinate>} LineCoordType\n */\n\n\n/**\n * Coordinate type when drawing polygons.\n * @typedef {Array<Array<import(\"../coordinate.js\").Coordinate>>} PolyCoordType\n */\n\n\n/**\n * Types used for drawing coordinates.\n * @typedef {PointCoordType|LineCoordType|PolyCoordType} SketchCoordType\n */\n\n\n/**\n * Function that takes an array of coordinates and an optional existing geometry as\n * arguments, and returns a geometry. The optional existing geometry is the\n * geometry that is returned when the function is called without a second\n * argument.\n * @typedef {function(!SketchCoordType, import(\"../geom/SimpleGeometry.js\").default=):\n *     import(\"../geom/SimpleGeometry.js\").default} GeometryFunction\n */\n\n\n/**\n * Draw mode.  This collapses multi-part geometry types with their single-part\n * cousins.\n * @enum {string}\n */\nconst Mode = {\n  POINT: 'Point',\n  LINE_STRING: 'LineString',\n  POLYGON: 'Polygon',\n  CIRCLE: 'Circle'\n};\n\n\n/**\n * @enum {string}\n */\nconst DrawEventType = {\n  /**\n   * Triggered upon feature draw start\n   * @event DrawEvent#drawstart\n   * @api\n   */\n  DRAWSTART: 'drawstart',\n  /**\n   * Triggered upon feature draw end\n   * @event DrawEvent#drawend\n   * @api\n   */\n  DRAWEND: 'drawend'\n};\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/interaction/Draw~Draw} instances are\n * instances of this type.\n */\nclass DrawEvent extends Event {\n  /**\n   * @param {DrawEventType} type Type.\n   * @param {Feature} feature The feature drawn.\n   */\n  constructor(type, feature) {\n\n    super(type);\n\n    /**\n     * The feature being drawn.\n     * @type {Feature}\n     * @api\n     */\n    this.feature = feature;\n\n  }\n\n}\n\n\n/**\n * @classdesc\n * Interaction for drawing feature geometries.\n *\n * @fires DrawEvent\n * @api\n */\nclass Draw extends PointerInteraction {\n  /**\n   * @param {Options} options Options.\n   */\n  constructor(options) {\n\n    const pointerOptions = /** @type {import(\"./Pointer.js\").Options} */ (options);\n    if (!pointerOptions.stopDown) {\n      pointerOptions.stopDown = FALSE;\n    }\n\n    super(pointerOptions);\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.shouldHandle_ = false;\n\n    /**\n     * @type {import(\"../pixel.js\").Pixel}\n     * @private\n     */\n    this.downPx_ = null;\n\n    /**\n     * @type {?}\n     * @private\n     */\n    this.downTimeout_;\n\n    /**\n     * @type {number|undefined}\n     * @private\n     */\n    this.lastDragTime_;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.freehand_ = false;\n\n    /**\n     * Target source for drawn features.\n     * @type {VectorSource}\n     * @private\n     */\n    this.source_ = options.source ? options.source : null;\n\n    /**\n     * Target collection for drawn features.\n     * @type {import(\"../Collection.js\").default<Feature>}\n     * @private\n     */\n    this.features_ = options.features ? options.features : null;\n\n    /**\n     * Pixel distance for snapping.\n     * @type {number}\n     * @private\n     */\n    this.snapTolerance_ = options.snapTolerance ? options.snapTolerance : 12;\n\n    /**\n     * Geometry type.\n     * @type {GeometryType}\n     * @private\n     */\n    this.type_ = /** @type {GeometryType} */ (options.type);\n\n    /**\n     * Drawing mode (derived from geometry type.\n     * @type {Mode}\n     * @private\n     */\n    this.mode_ = getMode(this.type_);\n\n    /**\n     * Stop click, singleclick, and doubleclick events from firing during drawing.\n     * Default is `false`.\n     * @type {boolean}\n     * @private\n     */\n    this.stopClick_ = !!options.stopClick;\n\n    /**\n     * The number of points that must be drawn before a polygon ring or line\n     * string can be finished.  The default is 3 for polygon rings and 2 for\n     * line strings.\n     * @type {number}\n     * @private\n     */\n    this.minPoints_ = options.minPoints ?\n      options.minPoints :\n      (this.mode_ === Mode.POLYGON ? 3 : 2);\n\n    /**\n     * The number of points that can be drawn before a polygon ring or line string\n     * is finished. The default is no restriction.\n     * @type {number}\n     * @private\n     */\n    this.maxPoints_ = options.maxPoints ? options.maxPoints : Infinity;\n\n    /**\n     * A function to decide if a potential finish coordinate is permissible\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.finishCondition_ = options.finishCondition ? options.finishCondition : TRUE;\n\n    let geometryFunction = options.geometryFunction;\n    if (!geometryFunction) {\n      if (this.type_ === GeometryType.CIRCLE) {\n        /**\n         * @param {!LineCoordType} coordinates The coordinates.\n         * @param {import(\"../geom/SimpleGeometry.js\").default=} opt_geometry Optional geometry.\n         * @return {import(\"../geom/SimpleGeometry.js\").default} A geometry.\n         */\n        geometryFunction = function(coordinates, opt_geometry) {\n          const circle = opt_geometry ? /** @type {Circle} */ (opt_geometry) :\n            new Circle([NaN, NaN]);\n          const squaredLength = squaredCoordinateDistance(\n            coordinates[0], coordinates[1]);\n          circle.setCenterAndRadius(coordinates[0], Math.sqrt(squaredLength));\n          return circle;\n        };\n      } else {\n        let Constructor;\n        const mode = this.mode_;\n        if (mode === Mode.POINT) {\n          Constructor = Point;\n        } else if (mode === Mode.LINE_STRING) {\n          Constructor = LineString;\n        } else if (mode === Mode.POLYGON) {\n          Constructor = Polygon;\n        }\n        /**\n         * @param {!LineCoordType} coordinates The coordinates.\n         * @param {import(\"../geom/SimpleGeometry.js\").default=} opt_geometry Optional geometry.\n         * @return {import(\"../geom/SimpleGeometry.js\").default} A geometry.\n         */\n        geometryFunction = function(coordinates, opt_geometry) {\n          let geometry = opt_geometry;\n          if (geometry) {\n            if (mode === Mode.POLYGON) {\n              if (coordinates[0].length) {\n                // Add a closing coordinate to match the first\n                geometry.setCoordinates([coordinates[0].concat([coordinates[0][0]])]);\n              } else {\n                geometry.setCoordinates([]);\n              }\n            } else {\n              geometry.setCoordinates(coordinates);\n            }\n          } else {\n            geometry = new Constructor(coordinates);\n          }\n          return geometry;\n        };\n      }\n    }\n\n    /**\n     * @type {GeometryFunction}\n     * @private\n     */\n    this.geometryFunction_ = geometryFunction;\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.dragVertexDelay_ = options.dragVertexDelay !== undefined ? options.dragVertexDelay : 500;\n\n    /**\n     * Finish coordinate for the feature (first point for polygons, last point for\n     * linestrings).\n     * @type {import(\"../coordinate.js\").Coordinate}\n     * @private\n     */\n    this.finishCoordinate_ = null;\n\n    /**\n     * Sketch feature.\n     * @type {Feature}\n     * @private\n     */\n    this.sketchFeature_ = null;\n\n    /**\n     * Sketch point.\n     * @type {Feature}\n     * @private\n     */\n    this.sketchPoint_ = null;\n\n    /**\n     * Sketch coordinates. Used when drawing a line or polygon.\n     * @type {SketchCoordType}\n     * @private\n     */\n    this.sketchCoords_ = null;\n\n    /**\n     * Sketch line. Used when drawing polygon.\n     * @type {Feature}\n     * @private\n     */\n    this.sketchLine_ = null;\n\n    /**\n     * Sketch line coordinates. Used when drawing a polygon or circle.\n     * @type {LineCoordType}\n     * @private\n     */\n    this.sketchLineCoords_ = null;\n\n    /**\n     * Squared tolerance for handling up events.  If the squared distance\n     * between a down and up event is greater than this tolerance, up events\n     * will not be handled.\n     * @type {number}\n     * @private\n     */\n    this.squaredClickTolerance_ = options.clickTolerance ?\n      options.clickTolerance * options.clickTolerance : 36;\n\n    /**\n     * Draw overlay where our sketch features are drawn.\n     * @type {VectorLayer}\n     * @private\n     */\n    this.overlay_ = new VectorLayer({\n      source: new VectorSource({\n        useSpatialIndex: false,\n        wrapX: options.wrapX ? options.wrapX : false\n      }),\n      style: options.style ? options.style :\n        getDefaultStyleFunction(),\n      updateWhileInteracting: true\n    });\n\n    /**\n     * Name of the geometry attribute for newly created features.\n     * @type {string|undefined}\n     * @private\n     */\n    this.geometryName_ = options.geometryName;\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.condition_ = options.condition ? options.condition : noModifierKeys;\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.freehandCondition_;\n    if (options.freehand) {\n      this.freehandCondition_ = always;\n    } else {\n      this.freehandCondition_ = options.freehandCondition ?\n        options.freehandCondition : shiftKeyOnly;\n    }\n\n    listen(this,\n      getChangeEventType(InteractionProperty.ACTIVE),\n      this.updateState_, this);\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setMap(map) {\n    super.setMap(map);\n    this.updateState_();\n  }\n\n  /**\n   * Get the overlay layer that this interaction renders sketch features to.\n   * @return {VectorLayer} Overlay layer.\n   * @api\n   */\n  getOverlay() {\n    return this.overlay_;\n  }\n\n  /**\n   * Handles the {@link module:ol/MapBrowserEvent map browser event} and may actually draw or finish the drawing.\n   * @override\n   * @api\n   */\n  handleEvent(event) {\n    if (event.originalEvent.type === EventType.CONTEXTMENU) {\n      // Avoid context menu for long taps when drawing on mobile\n      event.preventDefault();\n    }\n    this.freehand_ = this.mode_ !== Mode.POINT && this.freehandCondition_(event);\n    let move = event.type === MapBrowserEventType.POINTERMOVE;\n    let pass = true;\n    if (!this.freehand_ && this.lastDragTime_ && event.type === MapBrowserEventType.POINTERDRAG) {\n      const now = Date.now();\n      if (now - this.lastDragTime_ >= this.dragVertexDelay_) {\n        this.downPx_ = event.pixel;\n        this.shouldHandle_ = !this.freehand_;\n        move = true;\n      } else {\n        this.lastDragTime_ = undefined;\n      }\n      if (this.shouldHandle_ && this.downTimeout_ !== undefined) {\n        clearTimeout(this.downTimeout_);\n        this.downTimeout_ = undefined;\n      }\n    }\n    if (this.freehand_ &&\n        event.type === MapBrowserEventType.POINTERDRAG &&\n        this.sketchFeature_ !== null) {\n      this.addToDrawing_(event);\n      pass = false;\n    } else if (this.freehand_ &&\n        event.type === MapBrowserEventType.POINTERDOWN) {\n      pass = false;\n    } else if (move) {\n      pass = event.type === MapBrowserEventType.POINTERMOVE;\n      if (pass && this.freehand_) {\n        pass = this.handlePointerMove_(event);\n      } else if (/** @type {MapBrowserPointerEvent} */ (event).pointerEvent.pointerType == POINTER_TYPE ||\n          (event.type === MapBrowserEventType.POINTERDRAG && this.downTimeout_ === undefined)) {\n        this.handlePointerMove_(event);\n      }\n    } else if (event.type === MapBrowserEventType.DBLCLICK) {\n      pass = false;\n    }\n\n    return super.handleEvent(event) && pass;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDownEvent(event) {\n    this.shouldHandle_ = !this.freehand_;\n\n    if (this.freehand_) {\n      this.downPx_ = event.pixel;\n      if (!this.finishCoordinate_) {\n        this.startDrawing_(event);\n      }\n      return true;\n    } else if (this.condition_(event)) {\n      this.lastDragTime_ = Date.now();\n      this.downTimeout_ = setTimeout(function() {\n        this.handlePointerMove_(new MapBrowserPointerEvent(\n          MapBrowserEventType.POINTERMOVE, event.map, event.pointerEvent, false, event.frameState));\n      }.bind(this), this.dragVertexDelay_);\n      this.downPx_ = event.pixel;\n      return true;\n    } else {\n      return false;\n    }\n  }\n\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(event) {\n    let pass = true;\n\n    if (this.downTimeout_) {\n      clearTimeout(this.downTimeout_);\n      this.downTimeout_ = undefined;\n    }\n\n    this.handlePointerMove_(event);\n\n    const circleMode = this.mode_ === Mode.CIRCLE;\n\n    if (this.shouldHandle_) {\n      if (!this.finishCoordinate_) {\n        this.startDrawing_(event);\n        if (this.mode_ === Mode.POINT) {\n          this.finishDrawing();\n        }\n      } else if (this.freehand_ || circleMode) {\n        this.finishDrawing();\n      } else if (this.atFinish_(event)) {\n        if (this.finishCondition_(event)) {\n          this.finishDrawing();\n        }\n      } else {\n        this.addToDrawing_(event);\n      }\n      pass = false;\n    } else if (this.freehand_) {\n      this.finishCoordinate_ = null;\n      this.abortDrawing_();\n    }\n    if (!pass && this.stopClick_) {\n      event.stopPropagation();\n    }\n    return pass;\n  }\n\n  /**\n   * Handle move events.\n   * @param {import(\"../MapBrowserEvent.js\").default} event A move event.\n   * @return {boolean} Pass the event to other interactions.\n   * @private\n   */\n  handlePointerMove_(event) {\n    if (this.downPx_ &&\n        ((!this.freehand_ && this.shouldHandle_) ||\n        (this.freehand_ && !this.shouldHandle_))) {\n      const downPx = this.downPx_;\n      const clickPx = event.pixel;\n      const dx = downPx[0] - clickPx[0];\n      const dy = downPx[1] - clickPx[1];\n      const squaredDistance = dx * dx + dy * dy;\n      this.shouldHandle_ = this.freehand_ ?\n        squaredDistance > this.squaredClickTolerance_ :\n        squaredDistance <= this.squaredClickTolerance_;\n      if (!this.shouldHandle_) {\n        return true;\n      }\n    }\n\n    if (this.finishCoordinate_) {\n      this.modifyDrawing_(event);\n    } else {\n      this.createOrUpdateSketchPoint_(event);\n    }\n    return true;\n  }\n\n  /**\n   * Determine if an event is within the snapping tolerance of the start coord.\n   * @param {import(\"../MapBrowserEvent.js\").default} event Event.\n   * @return {boolean} The event is within the snapping tolerance of the start.\n   * @private\n   */\n  atFinish_(event) {\n    let at = false;\n    if (this.sketchFeature_) {\n      let potentiallyDone = false;\n      let potentiallyFinishCoordinates = [this.finishCoordinate_];\n      if (this.mode_ === Mode.LINE_STRING) {\n        potentiallyDone = this.sketchCoords_.length > this.minPoints_;\n      } else if (this.mode_ === Mode.POLYGON) {\n        const sketchCoords = /** @type {PolyCoordType} */ (this.sketchCoords_);\n        potentiallyDone = sketchCoords[0].length > this.minPoints_;\n        potentiallyFinishCoordinates = [sketchCoords[0][0], sketchCoords[0][sketchCoords[0].length - 2]];\n      }\n      if (potentiallyDone) {\n        const map = event.map;\n        for (let i = 0, ii = potentiallyFinishCoordinates.length; i < ii; i++) {\n          const finishCoordinate = potentiallyFinishCoordinates[i];\n          const finishPixel = map.getPixelFromCoordinate(finishCoordinate);\n          const pixel = event.pixel;\n          const dx = pixel[0] - finishPixel[0];\n          const dy = pixel[1] - finishPixel[1];\n          const snapTolerance = this.freehand_ ? 1 : this.snapTolerance_;\n          at = Math.sqrt(dx * dx + dy * dy) <= snapTolerance;\n          if (at) {\n            this.finishCoordinate_ = finishCoordinate;\n            break;\n          }\n        }\n      }\n    }\n    return at;\n  }\n\n  /**\n   * @param {import(\"../MapBrowserEvent.js\").default} event Event.\n   * @private\n   */\n  createOrUpdateSketchPoint_(event) {\n    const coordinates = event.coordinate.slice();\n    if (!this.sketchPoint_) {\n      this.sketchPoint_ = new Feature(new Point(coordinates));\n      this.updateSketchFeatures_();\n    } else {\n      const sketchPointGeom = /** @type {Point} */ (this.sketchPoint_.getGeometry());\n      sketchPointGeom.setCoordinates(coordinates);\n    }\n  }\n\n  /**\n   * Start the drawing.\n   * @param {import(\"../MapBrowserEvent.js\").default} event Event.\n   * @private\n   */\n  startDrawing_(event) {\n    const start = event.coordinate;\n    this.finishCoordinate_ = start;\n    if (this.mode_ === Mode.POINT) {\n      this.sketchCoords_ = start.slice();\n    } else if (this.mode_ === Mode.POLYGON) {\n      this.sketchCoords_ = [[start.slice(), start.slice()]];\n      this.sketchLineCoords_ = this.sketchCoords_[0];\n    } else {\n      this.sketchCoords_ = [start.slice(), start.slice()];\n    }\n    if (this.sketchLineCoords_) {\n      this.sketchLine_ = new Feature(\n        new LineString(this.sketchLineCoords_));\n    }\n    const geometry = this.geometryFunction_(this.sketchCoords_);\n    this.sketchFeature_ = new Feature();\n    if (this.geometryName_) {\n      this.sketchFeature_.setGeometryName(this.geometryName_);\n    }\n    this.sketchFeature_.setGeometry(geometry);\n    this.updateSketchFeatures_();\n    this.dispatchEvent(new DrawEvent(DrawEventType.DRAWSTART, this.sketchFeature_));\n  }\n\n  /**\n   * Modify the drawing.\n   * @param {import(\"../MapBrowserEvent.js\").default} event Event.\n   * @private\n   */\n  modifyDrawing_(event) {\n    let coordinate = event.coordinate;\n    const geometry = /** @type {import(\"../geom/SimpleGeometry.js\").default} */ (this.sketchFeature_.getGeometry());\n    let coordinates, last;\n    if (this.mode_ === Mode.POINT) {\n      last = this.sketchCoords_;\n    } else if (this.mode_ === Mode.POLYGON) {\n      coordinates = /** @type {PolyCoordType} */ (this.sketchCoords_)[0];\n      last = coordinates[coordinates.length - 1];\n      if (this.atFinish_(event)) {\n        // snap to finish\n        coordinate = this.finishCoordinate_.slice();\n      }\n    } else {\n      coordinates = this.sketchCoords_;\n      last = coordinates[coordinates.length - 1];\n    }\n    last[0] = coordinate[0];\n    last[1] = coordinate[1];\n    this.geometryFunction_(/** @type {!LineCoordType} */ (this.sketchCoords_), geometry);\n    if (this.sketchPoint_) {\n      const sketchPointGeom = /** @type {Point} */ (this.sketchPoint_.getGeometry());\n      sketchPointGeom.setCoordinates(coordinate);\n    }\n    /** @type {LineString} */\n    let sketchLineGeom;\n    if (geometry.getType() == GeometryType.POLYGON &&\n        this.mode_ !== Mode.POLYGON) {\n      if (!this.sketchLine_) {\n        this.sketchLine_ = new Feature();\n      }\n      const ring = /** @type {Polygon} */ (geometry).getLinearRing(0);\n      sketchLineGeom = /** @type {LineString} */ (this.sketchLine_.getGeometry());\n      if (!sketchLineGeom) {\n        sketchLineGeom = new LineString(ring.getFlatCoordinates(), ring.getLayout());\n        this.sketchLine_.setGeometry(sketchLineGeom);\n      } else {\n        sketchLineGeom.setFlatCoordinates(\n          ring.getLayout(), ring.getFlatCoordinates());\n        sketchLineGeom.changed();\n      }\n    } else if (this.sketchLineCoords_) {\n      sketchLineGeom = /** @type {LineString} */ (this.sketchLine_.getGeometry());\n      sketchLineGeom.setCoordinates(this.sketchLineCoords_);\n    }\n    this.updateSketchFeatures_();\n  }\n\n  /**\n   * Add a new coordinate to the drawing.\n   * @param {import(\"../MapBrowserEvent.js\").default} event Event.\n   * @private\n   */\n  addToDrawing_(event) {\n    const coordinate = event.coordinate;\n    const geometry = /** @type {import(\"../geom/SimpleGeometry.js\").default} */ (this.sketchFeature_.getGeometry());\n    let done;\n    let coordinates;\n    if (this.mode_ === Mode.LINE_STRING) {\n      this.finishCoordinate_ = coordinate.slice();\n      coordinates = /** @type {LineCoordType} */ (this.sketchCoords_);\n      if (coordinates.length >= this.maxPoints_) {\n        if (this.freehand_) {\n          coordinates.pop();\n        } else {\n          done = true;\n        }\n      }\n      coordinates.push(coordinate.slice());\n      this.geometryFunction_(coordinates, geometry);\n    } else if (this.mode_ === Mode.POLYGON) {\n      coordinates = /** @type {PolyCoordType} */ (this.sketchCoords_)[0];\n      if (coordinates.length >= this.maxPoints_) {\n        if (this.freehand_) {\n          coordinates.pop();\n        } else {\n          done = true;\n        }\n      }\n      coordinates.push(coordinate.slice());\n      if (done) {\n        this.finishCoordinate_ = coordinates[0];\n      }\n      this.geometryFunction_(this.sketchCoords_, geometry);\n    }\n    this.updateSketchFeatures_();\n    if (done) {\n      this.finishDrawing();\n    }\n  }\n\n  /**\n   * Remove last point of the feature currently being drawn.\n   * @api\n   */\n  removeLastPoint() {\n    if (!this.sketchFeature_) {\n      return;\n    }\n    const geometry = /** @type {import(\"../geom/SimpleGeometry.js\").default} */ (this.sketchFeature_.getGeometry());\n    let coordinates;\n    /** @type {LineString} */\n    let sketchLineGeom;\n    if (this.mode_ === Mode.LINE_STRING) {\n      coordinates = /** @type {LineCoordType} */ (this.sketchCoords_);\n      coordinates.splice(-2, 1);\n      this.geometryFunction_(coordinates, geometry);\n      if (coordinates.length >= 2) {\n        this.finishCoordinate_ = coordinates[coordinates.length - 2].slice();\n      }\n    } else if (this.mode_ === Mode.POLYGON) {\n      coordinates = /** @type {PolyCoordType} */ (this.sketchCoords_)[0];\n      coordinates.splice(-2, 1);\n      sketchLineGeom = /** @type {LineString} */ (this.sketchLine_.getGeometry());\n      sketchLineGeom.setCoordinates(coordinates);\n      this.geometryFunction_(this.sketchCoords_, geometry);\n    }\n\n    if (coordinates.length === 0) {\n      this.finishCoordinate_ = null;\n    }\n\n    this.updateSketchFeatures_();\n  }\n\n  /**\n   * Stop drawing and add the sketch feature to the target layer.\n   * The {@link module:ol/interaction/Draw~DrawEventType.DRAWEND} event is\n   * dispatched before inserting the feature.\n   * @api\n   */\n  finishDrawing() {\n    const sketchFeature = this.abortDrawing_();\n    if (!sketchFeature) {\n      return;\n    }\n    let coordinates = this.sketchCoords_;\n    const geometry = /** @type {import(\"../geom/SimpleGeometry.js\").default} */ (sketchFeature.getGeometry());\n    if (this.mode_ === Mode.LINE_STRING) {\n      // remove the redundant last point\n      coordinates.pop();\n      this.geometryFunction_(coordinates, geometry);\n    } else if (this.mode_ === Mode.POLYGON) {\n      // remove the redundant last point in ring\n      /** @type {PolyCoordType} */ (coordinates)[0].pop();\n      this.geometryFunction_(coordinates, geometry);\n      coordinates = geometry.getCoordinates();\n    }\n\n    // cast multi-part geometries\n    if (this.type_ === GeometryType.MULTI_POINT) {\n      sketchFeature.setGeometry(new MultiPoint([/** @type {PointCoordType} */(coordinates)]));\n    } else if (this.type_ === GeometryType.MULTI_LINE_STRING) {\n      sketchFeature.setGeometry(new MultiLineString([/** @type {LineCoordType} */(coordinates)]));\n    } else if (this.type_ === GeometryType.MULTI_POLYGON) {\n      sketchFeature.setGeometry(new MultiPolygon([/** @type {PolyCoordType} */(coordinates)]));\n    }\n\n    // First dispatch event to allow full set up of feature\n    this.dispatchEvent(new DrawEvent(DrawEventType.DRAWEND, sketchFeature));\n\n    // Then insert feature\n    if (this.features_) {\n      this.features_.push(sketchFeature);\n    }\n    if (this.source_) {\n      this.source_.addFeature(sketchFeature);\n    }\n  }\n\n  /**\n   * Stop drawing without adding the sketch feature to the target layer.\n   * @return {Feature} The sketch feature (or null if none).\n   * @private\n   */\n  abortDrawing_() {\n    this.finishCoordinate_ = null;\n    const sketchFeature = this.sketchFeature_;\n    if (sketchFeature) {\n      this.sketchFeature_ = null;\n      this.sketchPoint_ = null;\n      this.sketchLine_ = null;\n      /** @type {VectorSource} */ (this.overlay_.getSource()).clear(true);\n    }\n    return sketchFeature;\n  }\n\n  /**\n   * Extend an existing geometry by adding additional points. This only works\n   * on features with `LineString` geometries, where the interaction will\n   * extend lines by adding points to the end of the coordinates array.\n   * @param {!Feature} feature Feature to be extended.\n   * @api\n   */\n  extend(feature) {\n    const geometry = feature.getGeometry();\n    const lineString = /** @type {LineString} */ (geometry);\n    this.sketchFeature_ = feature;\n    this.sketchCoords_ = lineString.getCoordinates();\n    const last = this.sketchCoords_[this.sketchCoords_.length - 1];\n    this.finishCoordinate_ = last.slice();\n    this.sketchCoords_.push(last.slice());\n    this.updateSketchFeatures_();\n    this.dispatchEvent(new DrawEvent(DrawEventType.DRAWSTART, this.sketchFeature_));\n  }\n\n  /**\n   * Redraw the sketch features.\n   * @private\n   */\n  updateSketchFeatures_() {\n    const sketchFeatures = [];\n    if (this.sketchFeature_) {\n      sketchFeatures.push(this.sketchFeature_);\n    }\n    if (this.sketchLine_) {\n      sketchFeatures.push(this.sketchLine_);\n    }\n    if (this.sketchPoint_) {\n      sketchFeatures.push(this.sketchPoint_);\n    }\n    const overlaySource = /** @type {VectorSource} */ (this.overlay_.getSource());\n    overlaySource.clear(true);\n    overlaySource.addFeatures(sketchFeatures);\n  }\n\n  /**\n   * @private\n   */\n  updateState_() {\n    const map = this.getMap();\n    const active = this.getActive();\n    if (!map || !active) {\n      this.abortDrawing_();\n    }\n    this.overlay_.setMap(active ? map : null);\n  }\n}\n\n\n/**\n * @return {import(\"../style/Style.js\").StyleFunction} Styles.\n */\nfunction getDefaultStyleFunction() {\n  const styles = createEditingStyle();\n  return function(feature, resolution) {\n    return styles[feature.getGeometry().getType()];\n  };\n}\n\n\n/**\n * Create a `geometryFunction` for `type: 'Circle'` that will create a regular\n * polygon with a user specified number of sides and start angle instead of an\n * `import(\"../geom/Circle.js\").Circle` geometry.\n * @param {number=} opt_sides Number of sides of the regular polygon. Default is\n *     32.\n * @param {number=} opt_angle Angle of the first point in radians. 0 means East.\n *     Default is the angle defined by the heading from the center of the\n *     regular polygon to the current pointer position.\n * @return {GeometryFunction} Function that draws a\n *     polygon.\n * @api\n */\nexport function createRegularPolygon(opt_sides, opt_angle) {\n  return function(coordinates, opt_geometry) {\n    const center = /** @type {LineCoordType} */ (coordinates)[0];\n    const end = /** @type {LineCoordType} */ (coordinates)[1];\n    const radius = Math.sqrt(\n      squaredCoordinateDistance(center, end));\n    const geometry = opt_geometry ? /** @type {Polygon} */ (opt_geometry) :\n      fromCircle(new Circle(center), opt_sides);\n    let angle = opt_angle;\n    if (!opt_angle) {\n      const x = end[0] - center[0];\n      const y = end[1] - center[1];\n      angle = Math.atan(y / x) - (x < 0 ? Math.PI : 0);\n    }\n    makeRegular(geometry, center, radius, angle);\n    return geometry;\n  };\n}\n\n\n/**\n * Create a `geometryFunction` that will create a box-shaped polygon (aligned\n * with the coordinate system axes).  Use this with the draw interaction and\n * `type: 'Circle'` to return a box instead of a circle geometry.\n * @return {GeometryFunction} Function that draws a box-shaped polygon.\n * @api\n */\nexport function createBox() {\n  return (\n    function(coordinates, opt_geometry) {\n      const extent = boundingExtent(/** @type {LineCoordType} */ (coordinates));\n      const boxCoordinates = [[\n        getBottomLeft(extent),\n        getBottomRight(extent),\n        getTopRight(extent),\n        getTopLeft(extent),\n        getBottomLeft(extent)\n      ]];\n      let geometry = opt_geometry;\n      if (geometry) {\n        geometry.setCoordinates(boxCoordinates);\n      } else {\n        geometry = new Polygon(boxCoordinates);\n      }\n      return geometry;\n    }\n  );\n}\n\n\n/**\n * Get the drawing mode.  The mode for mult-part geometries is the same as for\n * their single-part cousins.\n * @param {GeometryType} type Geometry type.\n * @return {Mode} Drawing mode.\n */\nfunction getMode(type) {\n  let mode;\n  if (type === GeometryType.POINT ||\n      type === GeometryType.MULTI_POINT) {\n    mode = Mode.POINT;\n  } else if (type === GeometryType.LINE_STRING ||\n      type === GeometryType.MULTI_LINE_STRING) {\n    mode = Mode.LINE_STRING;\n  } else if (type === GeometryType.POLYGON ||\n      type === GeometryType.MULTI_POLYGON) {\n    mode = Mode.POLYGON;\n  } else if (type === GeometryType.CIRCLE) {\n    mode = Mode.CIRCLE;\n  }\n  return (\n    /** @type {!Mode} */ (mode)\n  );\n}\n\n\nexport default Draw;\n","/**\n * @module ol/interaction/Extent\n */\nimport Feature from '../Feature.js';\nimport MapBrowserEventType from '../MapBrowserEventType.js';\nimport {squaredDistanceToSegment, closestOnSegment, distance as coordinateDistance, squaredDistance as squaredCoordinateDistance} from '../coordinate.js';\nimport Event from '../events/Event.js';\nimport {boundingExtent, getArea} from '../extent.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport Point from '../geom/Point.js';\nimport {fromExtent as polygonFromExtent} from '../geom/Polygon.js';\nimport PointerInteraction from './Pointer.js';\nimport VectorLayer from '../layer/Vector.js';\nimport VectorSource from '../source/Vector.js';\nimport {createEditingStyle} from '../style/Style.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../extent.js\").Extent} [extent] Initial extent. Defaults to no\n * initial extent.\n * @property {import(\"../style/Style.js\").StyleLike} [boxStyle]\n * Style for the drawn extent box. Defaults to\n * {@link module:ol/style/Style~createEditing()['Polygon']}\n * @property {number} [pixelTolerance=10] Pixel tolerance for considering the\n * pointer close enough to a segment or vertex for editing.\n * @property {import(\"../style/Style.js\").StyleLike} [pointerStyle]\n * Style for the cursor used to draw the extent. Defaults to\n * {@link module:ol/style/Style~createEditing()['Point']}\n * @property {boolean} [wrapX=false] Wrap the drawn extent across multiple maps\n * in the X direction? Only affects visuals, not functionality.\n */\n\n\n/**\n * @enum {string}\n */\nconst ExtentEventType = {\n  /**\n   * Triggered after the extent is changed\n   * @event ExtentEventType#extentchanged\n   * @api\n   */\n  EXTENTCHANGED: 'extentchanged'\n};\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/interaction/Extent~ExtentInteraction} instances are\n * instances of this type.\n */\nclass ExtentInteractionEvent extends Event {\n\n  /**\n   * @param {import(\"../extent.js\").Extent} extent the new extent\n   */\n  constructor(extent) {\n    super(ExtentEventType.EXTENTCHANGED);\n\n    /**\n     * The current extent.\n     * @type {import(\"../extent.js\").Extent}\n     * @api\n     */\n    this.extent = extent;\n  }\n\n}\n\n\n/**\n * @classdesc\n * Allows the user to draw a vector box by clicking and dragging on the map.\n * Once drawn, the vector box can be modified by dragging its vertices or edges.\n * This interaction is only supported for mouse devices.\n *\n * @fires Event\n * @api\n */\nclass ExtentInteraction extends PointerInteraction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || {};\n\n    super(/** @type {import(\"./Pointer.js\").Options} */ (options));\n\n    /**\n     * Extent of the drawn box\n     * @type {import(\"../extent.js\").Extent}\n     * @private\n     */\n    this.extent_ = null;\n\n    /**\n     * Handler for pointer move events\n     * @type {function (import(\"../coordinate.js\").Coordinate): import(\"../extent.js\").Extent|null}\n     * @private\n     */\n    this.pointerHandler_ = null;\n\n    /**\n     * Pixel threshold to snap to extent\n     * @type {number}\n     * @private\n     */\n    this.pixelTolerance_ = options.pixelTolerance !== undefined ?\n      options.pixelTolerance : 10;\n\n    /**\n     * Is the pointer snapped to an extent vertex\n     * @type {boolean}\n     * @private\n     */\n    this.snappedToVertex_ = false;\n\n    /**\n     * Feature for displaying the visible extent\n     * @type {Feature}\n     * @private\n     */\n    this.extentFeature_ = null;\n\n    /**\n     * Feature for displaying the visible pointer\n     * @type {Feature}\n     * @private\n     */\n    this.vertexFeature_ = null;\n\n    if (!opt_options) {\n      opt_options = {};\n    }\n\n    /**\n     * Layer for the extentFeature\n     * @type {VectorLayer}\n     * @private\n     */\n    this.extentOverlay_ = new VectorLayer({\n      source: new VectorSource({\n        useSpatialIndex: false,\n        wrapX: !!opt_options.wrapX\n      }),\n      style: opt_options.boxStyle ? opt_options.boxStyle : getDefaultExtentStyleFunction(),\n      updateWhileAnimating: true,\n      updateWhileInteracting: true\n    });\n\n    /**\n     * Layer for the vertexFeature\n     * @type {VectorLayer}\n     * @private\n     */\n    this.vertexOverlay_ = new VectorLayer({\n      source: new VectorSource({\n        useSpatialIndex: false,\n        wrapX: !!opt_options.wrapX\n      }),\n      style: opt_options.pointerStyle ? opt_options.pointerStyle : getDefaultPointerStyleFunction(),\n      updateWhileAnimating: true,\n      updateWhileInteracting: true\n    });\n\n    if (opt_options.extent) {\n      this.setExtent(opt_options.extent);\n    }\n  }\n\n  /**\n   * @param {import(\"../pixel.js\").Pixel} pixel cursor location\n   * @param {import(\"../PluggableMap.js\").default} map map\n   * @returns {import(\"../coordinate.js\").Coordinate|null} snapped vertex on extent\n   * @private\n   */\n  snapToVertex_(pixel, map) {\n    const pixelCoordinate = map.getCoordinateFromPixel(pixel);\n    const sortByDistance = function(a, b) {\n      return squaredDistanceToSegment(pixelCoordinate, a) -\n          squaredDistanceToSegment(pixelCoordinate, b);\n    };\n    const extent = this.getExtent();\n    if (extent) {\n      //convert extents to line segments and find the segment closest to pixelCoordinate\n      const segments = getSegments(extent);\n      segments.sort(sortByDistance);\n      const closestSegment = segments[0];\n\n      let vertex = (closestOnSegment(pixelCoordinate,\n        closestSegment));\n      const vertexPixel = map.getPixelFromCoordinate(vertex);\n\n      //if the distance is within tolerance, snap to the segment\n      if (coordinateDistance(pixel, vertexPixel) <= this.pixelTolerance_) {\n        //test if we should further snap to a vertex\n        const pixel1 = map.getPixelFromCoordinate(closestSegment[0]);\n        const pixel2 = map.getPixelFromCoordinate(closestSegment[1]);\n        const squaredDist1 = squaredCoordinateDistance(vertexPixel, pixel1);\n        const squaredDist2 = squaredCoordinateDistance(vertexPixel, pixel2);\n        const dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));\n        this.snappedToVertex_ = dist <= this.pixelTolerance_;\n        if (this.snappedToVertex_) {\n          vertex = squaredDist1 > squaredDist2 ?\n            closestSegment[1] : closestSegment[0];\n        }\n        return vertex;\n      }\n    }\n    return null;\n  }\n\n  /**\n   * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent pointer move event\n   * @private\n   */\n  handlePointerMove_(mapBrowserEvent) {\n    const pixel = mapBrowserEvent.pixel;\n    const map = mapBrowserEvent.map;\n\n    let vertex = this.snapToVertex_(pixel, map);\n    if (!vertex) {\n      vertex = map.getCoordinateFromPixel(pixel);\n    }\n    this.createOrUpdatePointerFeature_(vertex);\n  }\n\n  /**\n   * @param {import(\"../extent.js\").Extent} extent extent\n   * @returns {Feature} extent as featrue\n   * @private\n   */\n  createOrUpdateExtentFeature_(extent) {\n    let extentFeature = this.extentFeature_;\n\n    if (!extentFeature) {\n      if (!extent) {\n        extentFeature = new Feature({});\n      } else {\n        extentFeature = new Feature(polygonFromExtent(extent));\n      }\n      this.extentFeature_ = extentFeature;\n      /** @type {VectorSource} */ (this.extentOverlay_.getSource()).addFeature(extentFeature);\n    } else {\n      if (!extent) {\n        extentFeature.setGeometry(undefined);\n      } else {\n        extentFeature.setGeometry(polygonFromExtent(extent));\n      }\n    }\n    return extentFeature;\n  }\n\n  /**\n   * @param {import(\"../coordinate.js\").Coordinate} vertex location of feature\n   * @returns {Feature} vertex as feature\n   * @private\n   */\n  createOrUpdatePointerFeature_(vertex) {\n    let vertexFeature = this.vertexFeature_;\n    if (!vertexFeature) {\n      vertexFeature = new Feature(new Point(vertex));\n      this.vertexFeature_ = vertexFeature;\n      /** @type {VectorSource} */ (this.vertexOverlay_.getSource()).addFeature(vertexFeature);\n    } else {\n      const geometry = /** @type {Point} */ (vertexFeature.getGeometry());\n      geometry.setCoordinates(vertex);\n    }\n    return vertexFeature;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleEvent(mapBrowserEvent) {\n    if (!(/** @type {import(\"../MapBrowserPointerEvent.js\").default} */ (mapBrowserEvent).pointerEvent)) {\n      return true;\n    }\n    //display pointer (if not dragging)\n    if (mapBrowserEvent.type == MapBrowserEventType.POINTERMOVE && !this.handlingDownUpSequence) {\n      this.handlePointerMove_(mapBrowserEvent);\n    }\n    //call pointer to determine up/down/drag\n    super.handleEvent(mapBrowserEvent);\n    //return false to stop propagation\n    return false;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDownEvent(mapBrowserEvent) {\n    const pixel = mapBrowserEvent.pixel;\n    const map = mapBrowserEvent.map;\n\n    const extent = this.getExtent();\n    let vertex = this.snapToVertex_(pixel, map);\n\n    //find the extent corner opposite the passed corner\n    const getOpposingPoint = function(point) {\n      let x_ = null;\n      let y_ = null;\n      if (point[0] == extent[0]) {\n        x_ = extent[2];\n      } else if (point[0] == extent[2]) {\n        x_ = extent[0];\n      }\n      if (point[1] == extent[1]) {\n        y_ = extent[3];\n      } else if (point[1] == extent[3]) {\n        y_ = extent[1];\n      }\n      if (x_ !== null && y_ !== null) {\n        return [x_, y_];\n      }\n      return null;\n    };\n    if (vertex && extent) {\n      const x = (vertex[0] == extent[0] || vertex[0] == extent[2]) ? vertex[0] : null;\n      const y = (vertex[1] == extent[1] || vertex[1] == extent[3]) ? vertex[1] : null;\n\n      //snap to point\n      if (x !== null && y !== null) {\n        this.pointerHandler_ = getPointHandler(getOpposingPoint(vertex));\n      //snap to edge\n      } else if (x !== null) {\n        this.pointerHandler_ = getEdgeHandler(\n          getOpposingPoint([x, extent[1]]),\n          getOpposingPoint([x, extent[3]])\n        );\n      } else if (y !== null) {\n        this.pointerHandler_ = getEdgeHandler(\n          getOpposingPoint([extent[0], y]),\n          getOpposingPoint([extent[2], y])\n        );\n      }\n    //no snap - new bbox\n    } else {\n      vertex = map.getCoordinateFromPixel(pixel);\n      this.setExtent([vertex[0], vertex[1], vertex[0], vertex[1]]);\n      this.pointerHandler_ = getPointHandler(vertex);\n    }\n    return true; //event handled; start downup sequence\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDragEvent(mapBrowserEvent) {\n    if (this.pointerHandler_) {\n      const pixelCoordinate = mapBrowserEvent.coordinate;\n      this.setExtent(this.pointerHandler_(pixelCoordinate));\n      this.createOrUpdatePointerFeature_(pixelCoordinate);\n    }\n    return true;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(mapBrowserEvent) {\n    this.pointerHandler_ = null;\n    //If bbox is zero area, set to null;\n    const extent = this.getExtent();\n    if (!extent || getArea(extent) === 0) {\n      this.setExtent(null);\n    }\n    return false; //Stop handling downup sequence\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setMap(map) {\n    this.extentOverlay_.setMap(map);\n    this.vertexOverlay_.setMap(map);\n    super.setMap(map);\n  }\n\n  /**\n   * Returns the current drawn extent in the view projection\n   *\n   * @return {import(\"../extent.js\").Extent} Drawn extent in the view projection.\n   * @api\n   */\n  getExtent() {\n    return this.extent_;\n  }\n\n  /**\n   * Manually sets the drawn extent, using the view projection.\n   *\n   * @param {import(\"../extent.js\").Extent} extent Extent\n   * @api\n   */\n  setExtent(extent) {\n    //Null extent means no bbox\n    this.extent_ = extent ? extent : null;\n    this.createOrUpdateExtentFeature_(extent);\n    this.dispatchEvent(new ExtentInteractionEvent(this.extent_));\n  }\n}\n\n/**\n * Returns the default style for the drawn bbox\n *\n * @return {import(\"../style/Style.js\").StyleFunction} Default Extent style\n */\nfunction getDefaultExtentStyleFunction() {\n  const style = createEditingStyle();\n  return function(feature, resolution) {\n    return style[GeometryType.POLYGON];\n  };\n}\n\n/**\n * Returns the default style for the pointer\n *\n * @return {import(\"../style/Style.js\").StyleFunction} Default pointer style\n */\nfunction getDefaultPointerStyleFunction() {\n  const style = createEditingStyle();\n  return function(feature, resolution) {\n    return style[GeometryType.POINT];\n  };\n}\n\n/**\n * @param {import(\"../coordinate.js\").Coordinate} fixedPoint corner that will be unchanged in the new extent\n * @returns {function (import(\"../coordinate.js\").Coordinate): import(\"../extent.js\").Extent} event handler\n */\nfunction getPointHandler(fixedPoint) {\n  return function(point) {\n    return boundingExtent([fixedPoint, point]);\n  };\n}\n\n/**\n * @param {import(\"../coordinate.js\").Coordinate} fixedP1 first corner that will be unchanged in the new extent\n * @param {import(\"../coordinate.js\").Coordinate} fixedP2 second corner that will be unchanged in the new extent\n * @returns {function (import(\"../coordinate.js\").Coordinate): import(\"../extent.js\").Extent|null} event handler\n */\nfunction getEdgeHandler(fixedP1, fixedP2) {\n  if (fixedP1[0] == fixedP2[0]) {\n    return function(point) {\n      return boundingExtent([fixedP1, [point[0], fixedP2[1]]]);\n    };\n  } else if (fixedP1[1] == fixedP2[1]) {\n    return function(point) {\n      return boundingExtent([fixedP1, [fixedP2[0], point[1]]]);\n    };\n  } else {\n    return null;\n  }\n}\n\n/**\n * @param {import(\"../extent.js\").Extent} extent extent\n * @returns {Array<Array<import(\"../coordinate.js\").Coordinate>>} extent line segments\n */\nfunction getSegments(extent) {\n  return [\n    [[extent[0], extent[1]], [extent[0], extent[3]]],\n    [[extent[0], extent[3]], [extent[2], extent[3]]],\n    [[extent[2], extent[3]], [extent[2], extent[1]]],\n    [[extent[2], extent[1]], [extent[0], extent[1]]]\n  ];\n}\n\n\nexport default ExtentInteraction;\n","/**\n * @module ol/interaction/Modify\n */\nimport {getUid} from '../util.js';\nimport Collection from '../Collection.js';\nimport CollectionEventType from '../CollectionEventType.js';\nimport Feature from '../Feature.js';\nimport MapBrowserEventType from '../MapBrowserEventType.js';\nimport {equals} from '../array.js';\nimport {equals as coordinatesEqual, distance as coordinateDistance, squaredDistance as squaredCoordinateDistance, squaredDistanceToSegment, closestOnSegment} from '../coordinate.js';\nimport {listen, unlisten} from '../events.js';\nimport Event from '../events/Event.js';\nimport EventType from '../events/EventType.js';\nimport {always, primaryAction, altKeyOnly, singleClick} from '../events/condition.js';\nimport {boundingExtent, buffer, createOrUpdateFromCoordinate} from '../extent.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport Point from '../geom/Point.js';\nimport PointerInteraction from './Pointer.js';\nimport VectorLayer from '../layer/Vector.js';\nimport VectorSource from '../source/Vector.js';\nimport VectorEventType from '../source/VectorEventType.js';\nimport RBush from '../structs/RBush.js';\nimport {createEditingStyle} from '../style/Style.js';\n\n\n/**\n * The segment index assigned to a circle's center when\n * breaking up a circle into ModifySegmentDataType segments.\n * @type {number}\n */\nconst CIRCLE_CENTER_INDEX = 0;\n\n/**\n * The segment index assigned to a circle's circumference when\n * breaking up a circle into ModifySegmentDataType segments.\n * @type {number}\n */\nconst CIRCLE_CIRCUMFERENCE_INDEX = 1;\n\n\n/**\n * @enum {string}\n */\nconst ModifyEventType = {\n  /**\n   * Triggered upon feature modification start\n   * @event ModifyEvent#modifystart\n   * @api\n   */\n  MODIFYSTART: 'modifystart',\n  /**\n   * Triggered upon feature modification end\n   * @event ModifyEvent#modifyend\n   * @api\n   */\n  MODIFYEND: 'modifyend'\n};\n\n\n/**\n * @typedef {Object} SegmentData\n * @property {Array<number>} [depth]\n * @property {Feature} feature\n * @property {import(\"../geom/SimpleGeometry.js\").default} geometry\n * @property {number} [index]\n * @property {Array<import(\"../extent.js\").Extent>} segment\n * @property {Array<SegmentData>} [featureSegments]\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event will be considered to add or move a\n * vertex to the sketch. Default is\n * {@link module:ol/events/condition~primaryAction}.\n * @property {import(\"../events/condition.js\").Condition} [deleteCondition] A function\n * that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled. By default,\n * {@link module:ol/events/condition~singleClick} with\n * {@link module:ol/events/condition~altKeyOnly} results in a vertex deletion.\n * @property {import(\"../events/condition.js\").Condition} [insertVertexCondition] A\n * function that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and\n * returns a boolean to indicate whether a new vertex can be added to the sketch\n * features. Default is {@link module:ol/events/condition~always}.\n * @property {number} [pixelTolerance=10] Pixel tolerance for considering the\n * pointer close enough to a segment or vertex for editing.\n * @property {import(\"../style/Style.js\").StyleLike} [style]\n * Style used for the features being modified. By default the default edit\n * style is used (see {@link module:ol/style}).\n * @property {VectorSource} [source] The vector source with\n * features to modify.  If a vector source is not provided, a feature collection\n * must be provided with the features option.\n * @property {Collection<Feature>} [features]\n * The features the interaction works on.  If a feature collection is not\n * provided, a vector source must be provided with the source option.\n * @property {boolean} [wrapX=false] Wrap the world horizontally on the sketch\n * overlay.\n */\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/interaction/Modify~Modify} instances are\n * instances of this type.\n */\nexport class ModifyEvent extends Event {\n  /**\n   * @param {ModifyEventType} type Type.\n   * @param {Collection<Feature>} features\n   * The features modified.\n   * @param {import(\"../MapBrowserPointerEvent.js\").default} mapBrowserPointerEvent\n   * Associated {@link module:ol/MapBrowserPointerEvent}.\n   */\n  constructor(type, features, mapBrowserPointerEvent) {\n    super(type);\n\n    /**\n     * The features being modified.\n     * @type {Collection<Feature>}\n     * @api\n     */\n    this.features = features;\n\n    /**\n     * Associated {@link module:ol/MapBrowserEvent}.\n     * @type {import(\"../MapBrowserEvent.js\").default}\n     * @api\n     */\n    this.mapBrowserEvent = mapBrowserPointerEvent;\n\n  }\n\n}\n\n\n/**\n * @classdesc\n * Interaction for modifying feature geometries.  To modify features that have\n * been added to an existing source, construct the modify interaction with the\n * `source` option.  If you want to modify features in a collection (for example,\n * the collection used by a select interaction), construct the interaction with\n * the `features` option.  The interaction must be constructed with either a\n * `source` or `features` option.\n *\n * By default, the interaction will allow deletion of vertices when the `alt`\n * key is pressed.  To configure the interaction with a different condition\n * for deletion, use the `deleteCondition` option.\n * @fires ModifyEvent\n * @api\n */\nclass Modify extends PointerInteraction {\n  /**\n   * @param {Options} options Options.\n   */\n  constructor(options) {\n\n    super(/** @type {import(\"./Pointer.js\").Options} */ (options));\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.condition_ = options.condition ? options.condition : primaryAction;\n\n    /**\n     * @private\n     * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Browser event.\n     * @return {boolean} Combined condition result.\n     */\n    this.defaultDeleteCondition_ = function(mapBrowserEvent) {\n      return altKeyOnly(mapBrowserEvent) && singleClick(mapBrowserEvent);\n    };\n\n    /**\n     * @type {import(\"../events/condition.js\").Condition}\n     * @private\n     */\n    this.deleteCondition_ = options.deleteCondition ?\n      options.deleteCondition : this.defaultDeleteCondition_;\n\n    /**\n     * @type {import(\"../events/condition.js\").Condition}\n     * @private\n     */\n    this.insertVertexCondition_ = options.insertVertexCondition ?\n      options.insertVertexCondition : always;\n\n    /**\n     * Editing vertex.\n     * @type {Feature}\n     * @private\n     */\n    this.vertexFeature_ = null;\n\n    /**\n     * Segments intersecting {@link this.vertexFeature_} by segment uid.\n     * @type {Object<string, boolean>}\n     * @private\n     */\n    this.vertexSegments_ = null;\n\n    /**\n     * @type {import(\"../pixel.js\").Pixel}\n     * @private\n     */\n    this.lastPixel_ = [0, 0];\n\n    /**\n     * Tracks if the next `singleclick` event should be ignored to prevent\n     * accidental deletion right after vertex creation.\n     * @type {boolean}\n     * @private\n     */\n    this.ignoreNextSingleClick_ = false;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.modified_ = false;\n\n    /**\n     * Segment RTree for each layer\n     * @type {RBush<SegmentData>}\n     * @private\n     */\n    this.rBush_ = new RBush();\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.pixelTolerance_ = options.pixelTolerance !== undefined ?\n      options.pixelTolerance : 10;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.snappedToVertex_ = false;\n\n    /**\n     * Indicate whether the interaction is currently changing a feature's\n     * coordinates.\n     * @type {boolean}\n     * @private\n     */\n    this.changingFeature_ = false;\n\n    /**\n     * @type {Array}\n     * @private\n     */\n    this.dragSegments_ = [];\n\n    /**\n     * Draw overlay where sketch features are drawn.\n     * @type {VectorLayer}\n     * @private\n     */\n    this.overlay_ = new VectorLayer({\n      source: new VectorSource({\n        useSpatialIndex: false,\n        wrapX: !!options.wrapX\n      }),\n      style: options.style ? options.style :\n        getDefaultStyleFunction(),\n      updateWhileAnimating: true,\n      updateWhileInteracting: true\n    });\n\n    /**\n     * @const\n     * @private\n     * @type {!Object<string, function(Feature, import(\"../geom/Geometry.js\").default)>}\n     */\n    this.SEGMENT_WRITERS_ = {\n      'Point': this.writePointGeometry_,\n      'LineString': this.writeLineStringGeometry_,\n      'LinearRing': this.writeLineStringGeometry_,\n      'Polygon': this.writePolygonGeometry_,\n      'MultiPoint': this.writeMultiPointGeometry_,\n      'MultiLineString': this.writeMultiLineStringGeometry_,\n      'MultiPolygon': this.writeMultiPolygonGeometry_,\n      'Circle': this.writeCircleGeometry_,\n      'GeometryCollection': this.writeGeometryCollectionGeometry_\n    };\n\n\n    /**\n     * @type {VectorSource}\n     * @private\n     */\n    this.source_ = null;\n\n    let features;\n    if (options.source) {\n      this.source_ = options.source;\n      features = new Collection(this.source_.getFeatures());\n      listen(this.source_, VectorEventType.ADDFEATURE,\n        this.handleSourceAdd_, this);\n      listen(this.source_, VectorEventType.REMOVEFEATURE,\n        this.handleSourceRemove_, this);\n    } else {\n      features = options.features;\n    }\n    if (!features) {\n      throw new Error('The modify interaction requires features or a source');\n    }\n\n    /**\n     * @type {Collection<Feature>}\n     * @private\n     */\n    this.features_ = features;\n\n    this.features_.forEach(this.addFeature_.bind(this));\n    listen(this.features_, CollectionEventType.ADD,\n      this.handleFeatureAdd_, this);\n    listen(this.features_, CollectionEventType.REMOVE,\n      this.handleFeatureRemove_, this);\n\n    /**\n     * @type {import(\"../MapBrowserPointerEvent.js\").default}\n     * @private\n     */\n    this.lastPointerEvent_ = null;\n\n  }\n\n  /**\n   * @param {Feature} feature Feature.\n   * @private\n   */\n  addFeature_(feature) {\n    const geometry = feature.getGeometry();\n    if (geometry && geometry.getType() in this.SEGMENT_WRITERS_) {\n      this.SEGMENT_WRITERS_[geometry.getType()].call(this, feature, geometry);\n    }\n    const map = this.getMap();\n    if (map && map.isRendered() && this.getActive()) {\n      this.handlePointerAtPixel_(this.lastPixel_, map);\n    }\n    listen(feature, EventType.CHANGE,\n      this.handleFeatureChange_, this);\n  }\n\n  /**\n   * @param {import(\"../MapBrowserPointerEvent.js\").default} evt Map browser event\n   * @private\n   */\n  willModifyFeatures_(evt) {\n    if (!this.modified_) {\n      this.modified_ = true;\n      this.dispatchEvent(new ModifyEvent(\n        ModifyEventType.MODIFYSTART, this.features_, evt));\n    }\n  }\n\n  /**\n   * @param {Feature} feature Feature.\n   * @private\n   */\n  removeFeature_(feature) {\n    this.removeFeatureSegmentData_(feature);\n    // Remove the vertex feature if the collection of canditate features\n    // is empty.\n    if (this.vertexFeature_ && this.features_.getLength() === 0) {\n      /** @type {VectorSource} */ (this.overlay_.getSource()).removeFeature(this.vertexFeature_);\n      this.vertexFeature_ = null;\n    }\n    unlisten(feature, EventType.CHANGE,\n      this.handleFeatureChange_, this);\n  }\n\n  /**\n   * @param {Feature} feature Feature.\n   * @private\n   */\n  removeFeatureSegmentData_(feature) {\n    const rBush = this.rBush_;\n    const /** @type {Array<SegmentData>} */ nodesToRemove = [];\n    rBush.forEach(\n      /**\n       * @param {SegmentData} node RTree node.\n       */\n      function(node) {\n        if (feature === node.feature) {\n          nodesToRemove.push(node);\n        }\n      });\n    for (let i = nodesToRemove.length - 1; i >= 0; --i) {\n      rBush.remove(nodesToRemove[i]);\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setActive(active) {\n    if (this.vertexFeature_ && !active) {\n      /** @type {VectorSource} */ (this.overlay_.getSource()).removeFeature(this.vertexFeature_);\n      this.vertexFeature_ = null;\n    }\n    super.setActive(active);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setMap(map) {\n    this.overlay_.setMap(map);\n    super.setMap(map);\n  }\n\n  /**\n   * Get the overlay layer that this interaction renders sketch features to.\n   * @return {VectorLayer} Overlay layer.\n   * @api\n   */\n  getOverlay() {\n    return this.overlay_;\n  }\n\n  /**\n   * @param {import(\"../source/Vector.js\").VectorSourceEvent} event Event.\n   * @private\n   */\n  handleSourceAdd_(event) {\n    if (event.feature) {\n      this.features_.push(event.feature);\n    }\n  }\n\n  /**\n   * @param {import(\"../source/Vector.js\").VectorSourceEvent} event Event.\n   * @private\n   */\n  handleSourceRemove_(event) {\n    if (event.feature) {\n      this.features_.remove(event.feature);\n    }\n  }\n\n  /**\n   * @param {import(\"../Collection.js\").CollectionEvent} evt Event.\n   * @private\n   */\n  handleFeatureAdd_(evt) {\n    this.addFeature_(/** @type {Feature} */ (evt.element));\n  }\n\n  /**\n   * @param {import(\"../events/Event.js\").default} evt Event.\n   * @private\n   */\n  handleFeatureChange_(evt) {\n    if (!this.changingFeature_) {\n      const feature = /** @type {Feature} */ (evt.target);\n      this.removeFeature_(feature);\n      this.addFeature_(feature);\n    }\n  }\n\n  /**\n   * @param {import(\"../Collection.js\").CollectionEvent} evt Event.\n   * @private\n   */\n  handleFeatureRemove_(evt) {\n    const feature = /** @type {Feature} */ (evt.element);\n    this.removeFeature_(feature);\n  }\n\n  /**\n   * @param {Feature} feature Feature\n   * @param {Point} geometry Geometry.\n   * @private\n   */\n  writePointGeometry_(feature, geometry) {\n    const coordinates = geometry.getCoordinates();\n    const segmentData = /** @type {SegmentData} */ ({\n      feature: feature,\n      geometry: geometry,\n      segment: [coordinates, coordinates]\n    });\n    this.rBush_.insert(geometry.getExtent(), segmentData);\n  }\n\n  /**\n   * @param {Feature} feature Feature\n   * @param {import(\"../geom/MultiPoint.js\").default} geometry Geometry.\n   * @private\n   */\n  writeMultiPointGeometry_(feature, geometry) {\n    const points = geometry.getCoordinates();\n    for (let i = 0, ii = points.length; i < ii; ++i) {\n      const coordinates = points[i];\n      const segmentData = /** @type {SegmentData} */ ({\n        feature: feature,\n        geometry: geometry,\n        depth: [i],\n        index: i,\n        segment: [coordinates, coordinates]\n      });\n      this.rBush_.insert(geometry.getExtent(), segmentData);\n    }\n  }\n\n  /**\n   * @param {Feature} feature Feature\n   * @param {import(\"../geom/LineString.js\").default} geometry Geometry.\n   * @private\n   */\n  writeLineStringGeometry_(feature, geometry) {\n    const coordinates = geometry.getCoordinates();\n    for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {\n      const segment = coordinates.slice(i, i + 2);\n      const segmentData = /** @type {SegmentData} */ ({\n        feature: feature,\n        geometry: geometry,\n        index: i,\n        segment: segment\n      });\n      this.rBush_.insert(boundingExtent(segment), segmentData);\n    }\n  }\n\n  /**\n   * @param {Feature} feature Feature\n   * @param {import(\"../geom/MultiLineString.js\").default} geometry Geometry.\n   * @private\n   */\n  writeMultiLineStringGeometry_(feature, geometry) {\n    const lines = geometry.getCoordinates();\n    for (let j = 0, jj = lines.length; j < jj; ++j) {\n      const coordinates = lines[j];\n      for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {\n        const segment = coordinates.slice(i, i + 2);\n        const segmentData = /** @type {SegmentData} */ ({\n          feature: feature,\n          geometry: geometry,\n          depth: [j],\n          index: i,\n          segment: segment\n        });\n        this.rBush_.insert(boundingExtent(segment), segmentData);\n      }\n    }\n  }\n\n  /**\n   * @param {Feature} feature Feature\n   * @param {import(\"../geom/Polygon.js\").default} geometry Geometry.\n   * @private\n   */\n  writePolygonGeometry_(feature, geometry) {\n    const rings = geometry.getCoordinates();\n    for (let j = 0, jj = rings.length; j < jj; ++j) {\n      const coordinates = rings[j];\n      for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {\n        const segment = coordinates.slice(i, i + 2);\n        const segmentData = /** @type {SegmentData} */ ({\n          feature: feature,\n          geometry: geometry,\n          depth: [j],\n          index: i,\n          segment: segment\n        });\n        this.rBush_.insert(boundingExtent(segment), segmentData);\n      }\n    }\n  }\n\n  /**\n   * @param {Feature} feature Feature\n   * @param {import(\"../geom/MultiPolygon.js\").default} geometry Geometry.\n   * @private\n   */\n  writeMultiPolygonGeometry_(feature, geometry) {\n    const polygons = geometry.getCoordinates();\n    for (let k = 0, kk = polygons.length; k < kk; ++k) {\n      const rings = polygons[k];\n      for (let j = 0, jj = rings.length; j < jj; ++j) {\n        const coordinates = rings[j];\n        for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {\n          const segment = coordinates.slice(i, i + 2);\n          const segmentData = /** @type {SegmentData} */ ({\n            feature: feature,\n            geometry: geometry,\n            depth: [j, k],\n            index: i,\n            segment: segment\n          });\n          this.rBush_.insert(boundingExtent(segment), segmentData);\n        }\n      }\n    }\n  }\n\n  /**\n   * We convert a circle into two segments.  The segment at index\n   * {@link CIRCLE_CENTER_INDEX} is the\n   * circle's center (a point).  The segment at index\n   * {@link CIRCLE_CIRCUMFERENCE_INDEX} is\n   * the circumference, and is not a line segment.\n   *\n   * @param {Feature} feature Feature.\n   * @param {import(\"../geom/Circle.js\").default} geometry Geometry.\n   * @private\n   */\n  writeCircleGeometry_(feature, geometry) {\n    const coordinates = geometry.getCenter();\n    const centerSegmentData = /** @type {SegmentData} */ ({\n      feature: feature,\n      geometry: geometry,\n      index: CIRCLE_CENTER_INDEX,\n      segment: [coordinates, coordinates]\n    });\n    const circumferenceSegmentData = /** @type {SegmentData} */ ({\n      feature: feature,\n      geometry: geometry,\n      index: CIRCLE_CIRCUMFERENCE_INDEX,\n      segment: [coordinates, coordinates]\n    });\n    const featureSegments = [centerSegmentData, circumferenceSegmentData];\n    centerSegmentData.featureSegments = circumferenceSegmentData.featureSegments = featureSegments;\n    this.rBush_.insert(createOrUpdateFromCoordinate(coordinates), centerSegmentData);\n    this.rBush_.insert(geometry.getExtent(), circumferenceSegmentData);\n  }\n\n  /**\n   * @param {Feature} feature Feature\n   * @param {import(\"../geom/GeometryCollection.js\").default} geometry Geometry.\n   * @private\n   */\n  writeGeometryCollectionGeometry_(feature, geometry) {\n    const geometries = geometry.getGeometriesArray();\n    for (let i = 0; i < geometries.length; ++i) {\n      this.SEGMENT_WRITERS_[geometries[i].getType()].call(this, feature, geometries[i]);\n    }\n  }\n\n  /**\n   * @param {import(\"../coordinate.js\").Coordinate} coordinates Coordinates.\n   * @return {Feature} Vertex feature.\n   * @private\n   */\n  createOrUpdateVertexFeature_(coordinates) {\n    let vertexFeature = this.vertexFeature_;\n    if (!vertexFeature) {\n      vertexFeature = new Feature(new Point(coordinates));\n      this.vertexFeature_ = vertexFeature;\n      /** @type {VectorSource} */ (this.overlay_.getSource()).addFeature(vertexFeature);\n    } else {\n      const geometry = /** @type {Point} */ (vertexFeature.getGeometry());\n      geometry.setCoordinates(coordinates);\n    }\n    return vertexFeature;\n  }\n\n  /**\n   * Handles the {@link module:ol/MapBrowserEvent map browser event} and may modify the geometry.\n   * @override\n   */\n  handleEvent(mapBrowserEvent) {\n    if (!(/** @type {import(\"../MapBrowserPointerEvent.js\").default} */ (mapBrowserEvent).pointerEvent)) {\n      return true;\n    }\n    this.lastPointerEvent_ = mapBrowserEvent;\n\n    let handled;\n    if (!mapBrowserEvent.map.getView().getInteracting() &&\n        mapBrowserEvent.type == MapBrowserEventType.POINTERMOVE &&\n        !this.handlingDownUpSequence) {\n      this.handlePointerMove_(mapBrowserEvent);\n    }\n    if (this.vertexFeature_ && this.deleteCondition_(mapBrowserEvent)) {\n      if (mapBrowserEvent.type != MapBrowserEventType.SINGLECLICK || !this.ignoreNextSingleClick_) {\n        handled = this.removePoint();\n      } else {\n        handled = true;\n      }\n    }\n\n    if (mapBrowserEvent.type == MapBrowserEventType.SINGLECLICK) {\n      this.ignoreNextSingleClick_ = false;\n    }\n\n    return super.handleEvent(mapBrowserEvent) && !handled;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDragEvent(evt) {\n    this.ignoreNextSingleClick_ = false;\n    this.willModifyFeatures_(evt);\n\n    const vertex = evt.coordinate;\n    for (let i = 0, ii = this.dragSegments_.length; i < ii; ++i) {\n      const dragSegment = this.dragSegments_[i];\n      const segmentData = dragSegment[0];\n      const depth = segmentData.depth;\n      const geometry = segmentData.geometry;\n      let coordinates;\n      const segment = segmentData.segment;\n      const index = dragSegment[1];\n\n      while (vertex.length < geometry.getStride()) {\n        vertex.push(segment[index][vertex.length]);\n      }\n\n      switch (geometry.getType()) {\n        case GeometryType.POINT:\n          coordinates = vertex;\n          segment[0] = segment[1] = vertex;\n          break;\n        case GeometryType.MULTI_POINT:\n          coordinates = geometry.getCoordinates();\n          coordinates[segmentData.index] = vertex;\n          segment[0] = segment[1] = vertex;\n          break;\n        case GeometryType.LINE_STRING:\n          coordinates = geometry.getCoordinates();\n          coordinates[segmentData.index + index] = vertex;\n          segment[index] = vertex;\n          break;\n        case GeometryType.MULTI_LINE_STRING:\n          coordinates = geometry.getCoordinates();\n          coordinates[depth[0]][segmentData.index + index] = vertex;\n          segment[index] = vertex;\n          break;\n        case GeometryType.POLYGON:\n          coordinates = geometry.getCoordinates();\n          coordinates[depth[0]][segmentData.index + index] = vertex;\n          segment[index] = vertex;\n          break;\n        case GeometryType.MULTI_POLYGON:\n          coordinates = geometry.getCoordinates();\n          coordinates[depth[1]][depth[0]][segmentData.index + index] = vertex;\n          segment[index] = vertex;\n          break;\n        case GeometryType.CIRCLE:\n          segment[0] = segment[1] = vertex;\n          if (segmentData.index === CIRCLE_CENTER_INDEX) {\n            this.changingFeature_ = true;\n            geometry.setCenter(vertex);\n            this.changingFeature_ = false;\n          } else { // We're dragging the circle's circumference:\n            this.changingFeature_ = true;\n            geometry.setRadius(coordinateDistance(geometry.getCenter(), vertex));\n            this.changingFeature_ = false;\n          }\n          break;\n        default:\n          // pass\n      }\n\n      if (coordinates) {\n        this.setGeometryCoordinates_(geometry, coordinates);\n      }\n    }\n    this.createOrUpdateVertexFeature_(vertex);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDownEvent(evt) {\n    if (!this.condition_(evt)) {\n      return false;\n    }\n    this.handlePointerAtPixel_(evt.pixel, evt.map);\n    const pixelCoordinate = evt.map.getCoordinateFromPixel(evt.pixel);\n    this.dragSegments_.length = 0;\n    this.modified_ = false;\n    const vertexFeature = this.vertexFeature_;\n    if (vertexFeature) {\n      const insertVertices = [];\n      const geometry = /** @type {Point} */ (vertexFeature.getGeometry());\n      const vertex = geometry.getCoordinates();\n      const vertexExtent = boundingExtent([vertex]);\n      const segmentDataMatches = this.rBush_.getInExtent(vertexExtent);\n      const componentSegments = {};\n      segmentDataMatches.sort(compareIndexes);\n      for (let i = 0, ii = segmentDataMatches.length; i < ii; ++i) {\n        const segmentDataMatch = segmentDataMatches[i];\n        const segment = segmentDataMatch.segment;\n        let uid = getUid(segmentDataMatch.feature);\n        const depth = segmentDataMatch.depth;\n        if (depth) {\n          uid += '-' + depth.join('-'); // separate feature components\n        }\n        if (!componentSegments[uid]) {\n          componentSegments[uid] = new Array(2);\n        }\n        if (segmentDataMatch.geometry.getType() === GeometryType.CIRCLE &&\n        segmentDataMatch.index === CIRCLE_CIRCUMFERENCE_INDEX) {\n\n          const closestVertex = closestOnSegmentData(pixelCoordinate, segmentDataMatch);\n          if (coordinatesEqual(closestVertex, vertex) && !componentSegments[uid][0]) {\n            this.dragSegments_.push([segmentDataMatch, 0]);\n            componentSegments[uid][0] = segmentDataMatch;\n          }\n        } else if (coordinatesEqual(segment[0], vertex) &&\n            !componentSegments[uid][0]) {\n          this.dragSegments_.push([segmentDataMatch, 0]);\n          componentSegments[uid][0] = segmentDataMatch;\n        } else if (coordinatesEqual(segment[1], vertex) &&\n            !componentSegments[uid][1]) {\n\n          // prevent dragging closed linestrings by the connecting node\n          if ((segmentDataMatch.geometry.getType() ===\n              GeometryType.LINE_STRING ||\n              segmentDataMatch.geometry.getType() ===\n              GeometryType.MULTI_LINE_STRING) &&\n              componentSegments[uid][0] &&\n              componentSegments[uid][0].index === 0) {\n            continue;\n          }\n\n          this.dragSegments_.push([segmentDataMatch, 1]);\n          componentSegments[uid][1] = segmentDataMatch;\n        } else if (this.insertVertexCondition_(evt) && getUid(segment) in this.vertexSegments_ &&\n            (!componentSegments[uid][0] && !componentSegments[uid][1])) {\n          insertVertices.push([segmentDataMatch, vertex]);\n        }\n      }\n      if (insertVertices.length) {\n        this.willModifyFeatures_(evt);\n      }\n      for (let j = insertVertices.length - 1; j >= 0; --j) {\n        this.insertVertex_.apply(this, insertVertices[j]);\n      }\n    }\n    return !!this.vertexFeature_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(evt) {\n    for (let i = this.dragSegments_.length - 1; i >= 0; --i) {\n      const segmentData = this.dragSegments_[i][0];\n      const geometry = segmentData.geometry;\n      if (geometry.getType() === GeometryType.CIRCLE) {\n        // Update a circle object in the R* bush:\n        const coordinates = geometry.getCenter();\n        const centerSegmentData = segmentData.featureSegments[0];\n        const circumferenceSegmentData = segmentData.featureSegments[1];\n        centerSegmentData.segment[0] = centerSegmentData.segment[1] = coordinates;\n        circumferenceSegmentData.segment[0] = circumferenceSegmentData.segment[1] = coordinates;\n        this.rBush_.update(createOrUpdateFromCoordinate(coordinates), centerSegmentData);\n        this.rBush_.update(geometry.getExtent(), circumferenceSegmentData);\n      } else {\n        this.rBush_.update(boundingExtent(segmentData.segment), segmentData);\n      }\n    }\n    if (this.modified_) {\n      this.dispatchEvent(new ModifyEvent(ModifyEventType.MODIFYEND, this.features_, evt));\n      this.modified_ = false;\n    }\n    return false;\n  }\n\n  /**\n   * @param {import(\"../MapBrowserEvent.js\").default} evt Event.\n   * @private\n   */\n  handlePointerMove_(evt) {\n    this.lastPixel_ = evt.pixel;\n    this.handlePointerAtPixel_(evt.pixel, evt.map);\n  }\n\n  /**\n   * @param {import(\"../pixel.js\").Pixel} pixel Pixel\n   * @param {import(\"../PluggableMap.js\").default} map Map.\n   * @private\n   */\n  handlePointerAtPixel_(pixel, map) {\n    const pixelCoordinate = map.getCoordinateFromPixel(pixel);\n    const sortByDistance = function(a, b) {\n      return pointDistanceToSegmentDataSquared(pixelCoordinate, a) -\n          pointDistanceToSegmentDataSquared(pixelCoordinate, b);\n    };\n\n    const box = buffer(createOrUpdateFromCoordinate(pixelCoordinate),\n      map.getView().getResolution() * this.pixelTolerance_);\n\n    const rBush = this.rBush_;\n    const nodes = rBush.getInExtent(box);\n    if (nodes.length > 0) {\n      nodes.sort(sortByDistance);\n      const node = nodes[0];\n      const closestSegment = node.segment;\n      let vertex = closestOnSegmentData(pixelCoordinate, node);\n      const vertexPixel = map.getPixelFromCoordinate(vertex);\n      let dist = coordinateDistance(pixel, vertexPixel);\n      if (dist <= this.pixelTolerance_) {\n        /** @type {Object<string, boolean>} */\n        const vertexSegments = {};\n\n        if (node.geometry.getType() === GeometryType.CIRCLE &&\n        node.index === CIRCLE_CIRCUMFERENCE_INDEX) {\n\n          this.snappedToVertex_ = true;\n          this.createOrUpdateVertexFeature_(vertex);\n        } else {\n          const pixel1 = map.getPixelFromCoordinate(closestSegment[0]);\n          const pixel2 = map.getPixelFromCoordinate(closestSegment[1]);\n          const squaredDist1 = squaredCoordinateDistance(vertexPixel, pixel1);\n          const squaredDist2 = squaredCoordinateDistance(vertexPixel, pixel2);\n          dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));\n          this.snappedToVertex_ = dist <= this.pixelTolerance_;\n          if (this.snappedToVertex_) {\n            vertex = squaredDist1 > squaredDist2 ? closestSegment[1] : closestSegment[0];\n          }\n          this.createOrUpdateVertexFeature_(vertex);\n          for (let i = 1, ii = nodes.length; i < ii; ++i) {\n            const segment = nodes[i].segment;\n            if ((coordinatesEqual(closestSegment[0], segment[0]) &&\n                coordinatesEqual(closestSegment[1], segment[1]) ||\n                (coordinatesEqual(closestSegment[0], segment[1]) &&\n                coordinatesEqual(closestSegment[1], segment[0])))) {\n              vertexSegments[getUid(segment)] = true;\n            } else {\n              break;\n            }\n          }\n        }\n\n        vertexSegments[getUid(closestSegment)] = true;\n        this.vertexSegments_ = vertexSegments;\n        return;\n      }\n    }\n    if (this.vertexFeature_) {\n      /** @type {VectorSource} */ (this.overlay_.getSource()).removeFeature(this.vertexFeature_);\n      this.vertexFeature_ = null;\n    }\n  }\n\n  /**\n   * @param {SegmentData} segmentData Segment data.\n   * @param {import(\"../coordinate.js\").Coordinate} vertex Vertex.\n   * @private\n   */\n  insertVertex_(segmentData, vertex) {\n    const segment = segmentData.segment;\n    const feature = segmentData.feature;\n    const geometry = segmentData.geometry;\n    const depth = segmentData.depth;\n    const index = /** @type {number} */ (segmentData.index);\n    let coordinates;\n\n    while (vertex.length < geometry.getStride()) {\n      vertex.push(0);\n    }\n\n    switch (geometry.getType()) {\n      case GeometryType.MULTI_LINE_STRING:\n        coordinates = geometry.getCoordinates();\n        coordinates[depth[0]].splice(index + 1, 0, vertex);\n        break;\n      case GeometryType.POLYGON:\n        coordinates = geometry.getCoordinates();\n        coordinates[depth[0]].splice(index + 1, 0, vertex);\n        break;\n      case GeometryType.MULTI_POLYGON:\n        coordinates = geometry.getCoordinates();\n        coordinates[depth[1]][depth[0]].splice(index + 1, 0, vertex);\n        break;\n      case GeometryType.LINE_STRING:\n        coordinates = geometry.getCoordinates();\n        coordinates.splice(index + 1, 0, vertex);\n        break;\n      default:\n        return;\n    }\n\n    this.setGeometryCoordinates_(geometry, coordinates);\n    const rTree = this.rBush_;\n    rTree.remove(segmentData);\n    this.updateSegmentIndices_(geometry, index, depth, 1);\n    const newSegmentData = /** @type {SegmentData} */ ({\n      segment: [segment[0], vertex],\n      feature: feature,\n      geometry: geometry,\n      depth: depth,\n      index: index\n    });\n    rTree.insert(boundingExtent(newSegmentData.segment),\n      newSegmentData);\n    this.dragSegments_.push([newSegmentData, 1]);\n\n    const newSegmentData2 = /** @type {SegmentData} */ ({\n      segment: [vertex, segment[1]],\n      feature: feature,\n      geometry: geometry,\n      depth: depth,\n      index: index + 1\n    });\n    rTree.insert(boundingExtent(newSegmentData2.segment), newSegmentData2);\n    this.dragSegments_.push([newSegmentData2, 0]);\n    this.ignoreNextSingleClick_ = true;\n  }\n\n  /**\n   * Removes the vertex currently being pointed.\n   * @return {boolean} True when a vertex was removed.\n   * @api\n   */\n  removePoint() {\n    if (this.lastPointerEvent_ && this.lastPointerEvent_.type != MapBrowserEventType.POINTERDRAG) {\n      const evt = this.lastPointerEvent_;\n      this.willModifyFeatures_(evt);\n      this.removeVertex_();\n      this.dispatchEvent(new ModifyEvent(ModifyEventType.MODIFYEND, this.features_, evt));\n      this.modified_ = false;\n      return true;\n    }\n    return false;\n  }\n\n  /**\n   * Removes a vertex from all matching features.\n   * @return {boolean} True when a vertex was removed.\n   * @private\n   */\n  removeVertex_() {\n    const dragSegments = this.dragSegments_;\n    const segmentsByFeature = {};\n    let deleted = false;\n    let component, coordinates, dragSegment, geometry, i, index, left;\n    let newIndex, right, segmentData, uid;\n    for (i = dragSegments.length - 1; i >= 0; --i) {\n      dragSegment = dragSegments[i];\n      segmentData = dragSegment[0];\n      uid = getUid(segmentData.feature);\n      if (segmentData.depth) {\n        // separate feature components\n        uid += '-' + segmentData.depth.join('-');\n      }\n      if (!(uid in segmentsByFeature)) {\n        segmentsByFeature[uid] = {};\n      }\n      if (dragSegment[1] === 0) {\n        segmentsByFeature[uid].right = segmentData;\n        segmentsByFeature[uid].index = segmentData.index;\n      } else if (dragSegment[1] == 1) {\n        segmentsByFeature[uid].left = segmentData;\n        segmentsByFeature[uid].index = segmentData.index + 1;\n      }\n\n    }\n    for (uid in segmentsByFeature) {\n      right = segmentsByFeature[uid].right;\n      left = segmentsByFeature[uid].left;\n      index = segmentsByFeature[uid].index;\n      newIndex = index - 1;\n      if (left !== undefined) {\n        segmentData = left;\n      } else {\n        segmentData = right;\n      }\n      if (newIndex < 0) {\n        newIndex = 0;\n      }\n      geometry = segmentData.geometry;\n      coordinates = geometry.getCoordinates();\n      component = coordinates;\n      deleted = false;\n      switch (geometry.getType()) {\n        case GeometryType.MULTI_LINE_STRING:\n          if (coordinates[segmentData.depth[0]].length > 2) {\n            coordinates[segmentData.depth[0]].splice(index, 1);\n            deleted = true;\n          }\n          break;\n        case GeometryType.LINE_STRING:\n          if (coordinates.length > 2) {\n            coordinates.splice(index, 1);\n            deleted = true;\n          }\n          break;\n        case GeometryType.MULTI_POLYGON:\n          component = component[segmentData.depth[1]];\n          /* falls through */\n        case GeometryType.POLYGON:\n          component = component[segmentData.depth[0]];\n          if (component.length > 4) {\n            if (index == component.length - 1) {\n              index = 0;\n            }\n            component.splice(index, 1);\n            deleted = true;\n            if (index === 0) {\n              // close the ring again\n              component.pop();\n              component.push(component[0]);\n              newIndex = component.length - 1;\n            }\n          }\n          break;\n        default:\n          // pass\n      }\n\n      if (deleted) {\n        this.setGeometryCoordinates_(geometry, coordinates);\n        const segments = [];\n        if (left !== undefined) {\n          this.rBush_.remove(left);\n          segments.push(left.segment[0]);\n        }\n        if (right !== undefined) {\n          this.rBush_.remove(right);\n          segments.push(right.segment[1]);\n        }\n        if (left !== undefined && right !== undefined) {\n          const newSegmentData = /** @type {SegmentData} */ ({\n            depth: segmentData.depth,\n            feature: segmentData.feature,\n            geometry: segmentData.geometry,\n            index: newIndex,\n            segment: segments\n          });\n          this.rBush_.insert(boundingExtent(newSegmentData.segment),\n            newSegmentData);\n        }\n        this.updateSegmentIndices_(geometry, index, segmentData.depth, -1);\n        if (this.vertexFeature_) {\n          /** @type {VectorSource} */ (this.overlay_.getSource()).removeFeature(this.vertexFeature_);\n          this.vertexFeature_ = null;\n        }\n        dragSegments.length = 0;\n      }\n\n    }\n    return deleted;\n  }\n\n  /**\n   * @param {import(\"../geom/SimpleGeometry.js\").default} geometry Geometry.\n   * @param {Array} coordinates Coordinates.\n   * @private\n   */\n  setGeometryCoordinates_(geometry, coordinates) {\n    this.changingFeature_ = true;\n    geometry.setCoordinates(coordinates);\n    this.changingFeature_ = false;\n  }\n\n  /**\n   * @param {import(\"../geom/SimpleGeometry.js\").default} geometry Geometry.\n   * @param {number} index Index.\n   * @param {Array<number>|undefined} depth Depth.\n   * @param {number} delta Delta (1 or -1).\n   * @private\n   */\n  updateSegmentIndices_(geometry, index, depth, delta) {\n    this.rBush_.forEachInExtent(geometry.getExtent(), function(segmentDataMatch) {\n      if (segmentDataMatch.geometry === geometry &&\n          (depth === undefined || segmentDataMatch.depth === undefined ||\n          equals(segmentDataMatch.depth, depth)) &&\n          segmentDataMatch.index > index) {\n        segmentDataMatch.index += delta;\n      }\n    });\n  }\n}\n\n\n/**\n * @param {SegmentData} a The first segment data.\n * @param {SegmentData} b The second segment data.\n * @return {number} The difference in indexes.\n */\nfunction compareIndexes(a, b) {\n  return a.index - b.index;\n}\n\n\n/**\n * Returns the distance from a point to a line segment.\n *\n * @param {import(\"../coordinate.js\").Coordinate} pointCoordinates The coordinates of the point from\n *        which to calculate the distance.\n * @param {SegmentData} segmentData The object describing the line\n *        segment we are calculating the distance to.\n * @return {number} The square of the distance between a point and a line segment.\n */\nfunction pointDistanceToSegmentDataSquared(pointCoordinates, segmentData) {\n  const geometry = segmentData.geometry;\n\n  if (geometry.getType() === GeometryType.CIRCLE) {\n    const circleGeometry = /** @type {import(\"../geom/Circle.js\").default} */ (geometry);\n\n    if (segmentData.index === CIRCLE_CIRCUMFERENCE_INDEX) {\n      const distanceToCenterSquared =\n            squaredCoordinateDistance(circleGeometry.getCenter(), pointCoordinates);\n      const distanceToCircumference =\n            Math.sqrt(distanceToCenterSquared) - circleGeometry.getRadius();\n      return distanceToCircumference * distanceToCircumference;\n    }\n  }\n  return squaredDistanceToSegment(pointCoordinates, segmentData.segment);\n}\n\n/**\n * Returns the point closest to a given line segment.\n *\n * @param {import(\"../coordinate.js\").Coordinate} pointCoordinates The point to which a closest point\n *        should be found.\n * @param {SegmentData} segmentData The object describing the line\n *        segment which should contain the closest point.\n * @return {import(\"../coordinate.js\").Coordinate} The point closest to the specified line segment.\n */\nfunction closestOnSegmentData(pointCoordinates, segmentData) {\n  const geometry = segmentData.geometry;\n\n  if (geometry.getType() === GeometryType.CIRCLE &&\n  segmentData.index === CIRCLE_CIRCUMFERENCE_INDEX) {\n    return geometry.getClosestPoint(pointCoordinates);\n  }\n  return closestOnSegment(pointCoordinates, segmentData.segment);\n}\n\n\n/**\n * @return {import(\"../style/Style.js\").StyleFunction} Styles.\n */\nfunction getDefaultStyleFunction() {\n  const style = createEditingStyle();\n  return function(feature, resolution) {\n    return style[GeometryType.POINT];\n  };\n}\n\n\nexport default Modify;\n","/**\n * @module ol/interaction/Select\n */\nimport {getUid} from '../util.js';\nimport CollectionEventType from '../CollectionEventType.js';\nimport {extend, includes} from '../array.js';\nimport {listen} from '../events.js';\nimport Event from '../events/Event.js';\nimport {singleClick, never, shiftKeyOnly, pointerMove} from '../events/condition.js';\nimport {TRUE} from '../functions.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport Interaction from './Interaction.js';\nimport VectorLayer from '../layer/Vector.js';\nimport {clear} from '../obj.js';\nimport VectorSource from '../source/Vector.js';\nimport {createEditingStyle} from '../style/Style.js';\n\n\n/**\n * @enum {string}\n */\nconst SelectEventType = {\n  /**\n   * Triggered when feature(s) has been (de)selected.\n   * @event SelectEvent#select\n   * @api\n   */\n  SELECT: 'select'\n};\n\n\n/**\n * A function that takes an {@link module:ol/Feature} or\n * {@link module:ol/render/Feature} and an\n * {@link module:ol/layer/Layer} and returns `true` if the feature may be\n * selected or `false` otherwise.\n * @typedef {function(import(\"../Feature.js\").FeatureLike, import(\"../layer/Layer.js\").default):boolean} FilterFunction\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../events/condition.js\").Condition} [addCondition] A function\n * that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled.\n * By default, this is {@link module:ol/events/condition~never}. Use this if you\n * want to use different events for add and remove instead of `toggle`.\n * @property {import(\"../events/condition.js\").Condition} [condition] A function that\n * takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled. This is the event\n * for the selected features as a whole. By default, this is\n * {@link module:ol/events/condition~singleClick}. Clicking on a feature selects that\n * feature and removes any that were in the selection. Clicking outside any\n * feature removes all from the selection.\n * See `toggle`, `add`, `remove` options for adding/removing extra features to/\n * from the selection.\n * @property {Array<import(\"../layer/Layer.js\").default>|function(import(\"../layer/Layer.js\").default): boolean} [layers]\n * A list of layers from which features should be selected. Alternatively, a\n * filter function can be provided. The function will be called for each layer\n * in the map and should return `true` for layers that you want to be\n * selectable. If the option is absent, all visible layers will be considered\n * selectable.\n * @property {import(\"../style/Style.js\").StyleLike} [style]\n * Style for the selected features. By default the default edit style is used\n * (see {@link module:ol/style}).\n * @property {import(\"../events/condition.js\").Condition} [removeCondition] A function\n * that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled.\n * By default, this is {@link module:ol/events/condition~never}. Use this if you\n * want to use different events for add and remove instead of `toggle`.\n * @property {import(\"../events/condition.js\").Condition} [toggleCondition] A function\n * that takes an {@link module:ol/MapBrowserEvent~MapBrowserEvent} and returns a\n * boolean to indicate whether that event should be handled. This is in addition\n * to the `condition` event. By default,\n * {@link module:ol/events/condition~shiftKeyOnly}, i.e. pressing `shift` as\n * well as the `condition` event, adds that feature to the current selection if\n * it is not currently selected, and removes it if it is. See `add` and `remove`\n * if you want to use different events instead of a toggle.\n * @property {boolean} [multi=false] A boolean that determines if the default\n * behaviour should select only single features or all (overlapping) features at\n * the clicked map position. The default of `false` means single select.\n * @property {import(\"../Collection.js\").default<import(\"../Feature.js\").default>} [features]\n * Collection where the interaction will place selected features. Optional. If\n * not set the interaction will create a collection. In any case the collection\n * used by the interaction is returned by\n * {@link module:ol/interaction/Select~Select#getFeatures}.\n * @property {FilterFunction} [filter] A function\n * that takes an {@link module:ol/Feature} and an\n * {@link module:ol/layer/Layer} and returns `true` if the feature may be\n * selected or `false` otherwise.\n * @property {boolean} [wrapX=true] Wrap the world horizontally on the selection\n * overlay.\n * @property {number} [hitTolerance=0] Hit-detection tolerance. Pixels inside\n * the radius around the given position will be checked for features. This only\n * works for the canvas renderer and not for WebGL.\n */\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/interaction/Select~Select} instances are instances of\n * this type.\n */\nclass SelectEvent extends Event {\n  /**\n   * @param {SelectEventType} type The event type.\n   * @param {Array<import(\"../Feature.js\").default>} selected Selected features.\n   * @param {Array<import(\"../Feature.js\").default>} deselected Deselected features.\n   * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Associated\n   *     {@link module:ol/MapBrowserEvent}.\n   */\n  constructor(type, selected, deselected, mapBrowserEvent) {\n    super(type);\n\n    /**\n     * Selected features array.\n     * @type {Array<import(\"../Feature.js\").default>}\n     * @api\n     */\n    this.selected = selected;\n\n    /**\n     * Deselected features array.\n     * @type {Array<import(\"../Feature.js\").default>}\n     * @api\n     */\n    this.deselected = deselected;\n\n    /**\n     * Associated {@link module:ol/MapBrowserEvent}.\n     * @type {import(\"../MapBrowserEvent.js\").default}\n     * @api\n     */\n    this.mapBrowserEvent = mapBrowserEvent;\n\n  }\n\n}\n\n\n/**\n * @classdesc\n * Interaction for selecting vector features. By default, selected features are\n * styled differently, so this interaction can be used for visual highlighting,\n * as well as selecting features for other actions, such as modification or\n * output. There are three ways of controlling which features are selected:\n * using the browser event as defined by the `condition` and optionally the\n * `toggle`, `add`/`remove`, and `multi` options; a `layers` filter; and a\n * further feature filter using the `filter` option.\n *\n * Selected features are added to an internal unmanaged layer.\n *\n * @fires SelectEvent\n * @api\n */\nclass Select extends Interaction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    super({\n      handleEvent: handleEvent\n    });\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.condition_ = options.condition ? options.condition : singleClick;\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.addCondition_ = options.addCondition ? options.addCondition : never;\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.removeCondition_ = options.removeCondition ? options.removeCondition : never;\n\n    /**\n     * @private\n     * @type {import(\"../events/condition.js\").Condition}\n     */\n    this.toggleCondition_ = options.toggleCondition ? options.toggleCondition : shiftKeyOnly;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.multi_ = options.multi ? options.multi : false;\n\n    /**\n     * @private\n     * @type {FilterFunction}\n     */\n    this.filter_ = options.filter ? options.filter : TRUE;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.hitTolerance_ = options.hitTolerance ? options.hitTolerance : 0;\n\n    const featureOverlay = new VectorLayer({\n      source: new VectorSource({\n        useSpatialIndex: false,\n        features: options.features,\n        wrapX: options.wrapX\n      }),\n      style: options.style ? options.style :\n        getDefaultStyleFunction(),\n      updateWhileAnimating: true,\n      updateWhileInteracting: true\n    });\n\n    /**\n     * @private\n     * @type {VectorLayer}\n     */\n    this.featureOverlay_ = featureOverlay;\n\n    /** @type {function(import(\"../layer/Layer.js\").default): boolean} */\n    let layerFilter;\n    if (options.layers) {\n      if (typeof options.layers === 'function') {\n        layerFilter = options.layers;\n      } else {\n        const layers = options.layers;\n        layerFilter = function(layer) {\n          return includes(layers, layer);\n        };\n      }\n    } else {\n      layerFilter = TRUE;\n    }\n\n    /**\n     * @private\n     * @type {function(import(\"../layer/Layer.js\").default): boolean}\n     */\n    this.layerFilter_ = layerFilter;\n\n    /**\n     * An association between selected feature (key)\n     * and layer (value)\n     * @private\n     * @type {Object<string, import(\"../layer/Layer.js\").default>}\n     */\n    this.featureLayerAssociation_ = {};\n\n    const features = this.getFeatures();\n    listen(features, CollectionEventType.ADD,\n      this.addFeature_, this);\n    listen(features, CollectionEventType.REMOVE,\n      this.removeFeature_, this);\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n   * @param {import(\"../layer/Layer.js\").default} layer Layer.\n   * @private\n   */\n  addFeatureLayerAssociation_(feature, layer) {\n    this.featureLayerAssociation_[getUid(feature)] = layer;\n  }\n\n  /**\n   * Get the selected features.\n   * @return {import(\"../Collection.js\").default<import(\"../Feature.js\").default>} Features collection.\n   * @api\n   */\n  getFeatures() {\n    return /** @type {VectorSource} */ (this.featureOverlay_.getSource()).getFeaturesCollection();\n  }\n\n  /**\n   * Returns the Hit-detection tolerance.\n   * @returns {number} Hit tolerance in pixels.\n   * @api\n   */\n  getHitTolerance() {\n    return this.hitTolerance_;\n  }\n\n  /**\n   * Returns the associated {@link module:ol/layer/Vector~Vector vectorlayer} of\n   * the (last) selected feature. Note that this will not work with any\n   * programmatic method like pushing features to\n   * {@link module:ol/interaction/Select~Select#getFeatures collection}.\n   * @param {import(\"../Feature.js\").FeatureLike} feature Feature\n   * @return {VectorLayer} Layer.\n   * @api\n   */\n  getLayer(feature) {\n    return (\n      /** @type {VectorLayer} */ (this.featureLayerAssociation_[getUid(feature)])\n    );\n  }\n\n  /**\n   * Get the overlay layer that this interaction renders selected features to.\n   * @return {VectorLayer} Overlay layer.\n   * @api\n   */\n  getOverlay() {\n    return this.featureOverlay_;\n  }\n\n  /**\n   * Hit-detection tolerance. Pixels inside the radius around the given position\n   * will be checked for features. This only works for the canvas renderer and\n   * not for WebGL.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @api\n   */\n  setHitTolerance(hitTolerance) {\n    this.hitTolerance_ = hitTolerance;\n  }\n\n  /**\n   * Remove the interaction from its current map, if any,  and attach it to a new\n   * map, if any. Pass `null` to just remove the interaction from the current map.\n   * @param {import(\"../PluggableMap.js\").default} map Map.\n   * @override\n   * @api\n   */\n  setMap(map) {\n    const currentMap = this.getMap();\n    const selectedFeatures = this.getFeatures();\n    if (currentMap) {\n      selectedFeatures.forEach(currentMap.unskipFeature.bind(currentMap));\n    }\n    super.setMap(map);\n    this.featureOverlay_.setMap(map);\n    if (map) {\n      selectedFeatures.forEach(map.skipFeature.bind(map));\n    }\n  }\n\n  /**\n   * @param {import(\"../Collection.js\").CollectionEvent} evt Event.\n   * @private\n   */\n  addFeature_(evt) {\n    const map = this.getMap();\n    if (map) {\n      map.skipFeature(/** @type {import(\"../Feature.js\").default} */ (evt.element));\n    }\n  }\n\n  /**\n   * @param {import(\"../Collection.js\").CollectionEvent} evt Event.\n   * @private\n   */\n  removeFeature_(evt) {\n    const map = this.getMap();\n    if (map) {\n      map.unskipFeature(/** @type {import(\"../Feature.js\").default} */ (evt.element));\n    }\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n   * @private\n   */\n  removeFeatureLayerAssociation_(feature) {\n    delete this.featureLayerAssociation_[getUid(feature)];\n  }\n}\n\n\n/**\n * Handles the {@link module:ol/MapBrowserEvent map browser event} and may change the\n * selected state of features.\n * @param {import(\"../MapBrowserEvent.js\").default} mapBrowserEvent Map browser event.\n * @return {boolean} `false` to stop event propagation.\n * @this {Select}\n */\nfunction handleEvent(mapBrowserEvent) {\n  if (!this.condition_(mapBrowserEvent)) {\n    return true;\n  }\n  const add = this.addCondition_(mapBrowserEvent);\n  const remove = this.removeCondition_(mapBrowserEvent);\n  const toggle = this.toggleCondition_(mapBrowserEvent);\n  const set = !add && !remove && !toggle;\n  const map = mapBrowserEvent.map;\n  const features = this.getFeatures();\n  const deselected = [];\n  const selected = [];\n  if (set) {\n    // Replace the currently selected feature(s) with the feature(s) at the\n    // pixel, or clear the selected feature(s) if there is no feature at\n    // the pixel.\n    clear(this.featureLayerAssociation_);\n    map.forEachFeatureAtPixel(mapBrowserEvent.pixel,\n      (\n        /**\n         * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n         * @param {import(\"../layer/Layer.js\").default} layer Layer.\n         * @return {boolean|undefined} Continue to iterate over the features.\n         */\n        function(feature, layer) {\n          if (this.filter_(feature, layer)) {\n            selected.push(feature);\n            this.addFeatureLayerAssociation_(feature, layer);\n            return !this.multi_;\n          }\n        }).bind(this), {\n        layerFilter: this.layerFilter_,\n        hitTolerance: this.hitTolerance_\n      });\n    for (let i = features.getLength() - 1; i >= 0; --i) {\n      const feature = features.item(i);\n      const index = selected.indexOf(feature);\n      if (index > -1) {\n        // feature is already selected\n        selected.splice(index, 1);\n      } else {\n        features.remove(feature);\n        deselected.push(feature);\n      }\n    }\n    if (selected.length !== 0) {\n      features.extend(selected);\n    }\n  } else {\n    // Modify the currently selected feature(s).\n    map.forEachFeatureAtPixel(mapBrowserEvent.pixel,\n      (\n        /**\n         * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n         * @param {import(\"../layer/Layer.js\").default} layer Layer.\n         * @return {boolean|undefined} Continue to iterate over the features.\n         */\n        function(feature, layer) {\n          if (this.filter_(feature, layer)) {\n            if ((add || toggle) && !includes(features.getArray(), feature)) {\n              selected.push(feature);\n              this.addFeatureLayerAssociation_(feature, layer);\n            } else if ((remove || toggle) && includes(features.getArray(), feature)) {\n              deselected.push(feature);\n              this.removeFeatureLayerAssociation_(feature);\n            }\n            return !this.multi_;\n          }\n        }).bind(this), {\n        layerFilter: this.layerFilter_,\n        hitTolerance: this.hitTolerance_\n      });\n    for (let j = deselected.length - 1; j >= 0; --j) {\n      features.remove(deselected[j]);\n    }\n    features.extend(selected);\n  }\n  if (selected.length > 0 || deselected.length > 0) {\n    this.dispatchEvent(\n      new SelectEvent(SelectEventType.SELECT,\n        selected, deselected, mapBrowserEvent));\n  }\n  return pointerMove(mapBrowserEvent);\n}\n\n\n/**\n * @return {import(\"../style/Style.js\").StyleFunction} Styles.\n */\nfunction getDefaultStyleFunction() {\n  const styles = createEditingStyle();\n  extend(styles[GeometryType.POLYGON], styles[GeometryType.LINE_STRING]);\n  extend(styles[GeometryType.GEOMETRY_COLLECTION], styles[GeometryType.LINE_STRING]);\n\n  return function(feature, resolution) {\n    if (!feature.getGeometry()) {\n      return null;\n    }\n    return styles[feature.getGeometry().getType()];\n  };\n}\n\n\nexport default Select;\n","/**\n * @module ol/interaction/Snap\n */\nimport {getUid} from '../util.js';\nimport CollectionEventType from '../CollectionEventType.js';\nimport {distance as coordinateDistance, squaredDistance as squaredCoordinateDistance, closestOnCircle, closestOnSegment, squaredDistanceToSegment} from '../coordinate.js';\nimport {listen, unlistenByKey} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {boundingExtent, createEmpty} from '../extent.js';\nimport {TRUE, FALSE} from '../functions.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport {fromCircle} from '../geom/Polygon.js';\nimport PointerInteraction from './Pointer.js';\nimport {getValues} from '../obj.js';\nimport VectorEventType from '../source/VectorEventType.js';\nimport RBush from '../structs/RBush.js';\n\n\n/**\n * @typedef {Object} Result\n * @property {boolean} snapped\n * @property {import(\"../coordinate.js\").Coordinate|null} vertex\n * @property {import(\"../pixel.js\").Pixel|null} vertexPixel\n */\n\n\n/**\n * @typedef {Object} SegmentData\n * @property {import(\"../Feature.js\").default} feature\n * @property {Array<import(\"../coordinate.js\").Coordinate>} segment\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../Collection.js\").default<import(\"../Feature.js\").default>} [features] Snap to these features. Either this option or source should be provided.\n * @property {boolean} [edge=true] Snap to edges.\n * @property {boolean} [vertex=true] Snap to vertices.\n * @property {number} [pixelTolerance=10] Pixel tolerance for considering the pointer close enough to a segment or\n * vertex for snapping.\n * @property {import(\"../source/Vector.js\").default} [source] Snap to features from this source. Either this option or features should be provided\n */\n\n\n/**\n * @param  {import(\"../source/Vector.js\").VectorSourceEvent|import(\"../Collection.js\").CollectionEvent} evt Event.\n * @return {import(\"../Feature.js\").default} Feature.\n */\nfunction getFeatureFromEvent(evt) {\n  if (/** @type {import(\"../source/Vector.js\").VectorSourceEvent} */ (evt).feature) {\n    return /** @type {import(\"../source/Vector.js\").VectorSourceEvent} */ (evt).feature;\n  } else if (/** @type {import(\"../Collection.js\").CollectionEvent} */ (evt).element) {\n    return /** @type {import(\"../Feature.js\").default} */ (/** @type {import(\"../Collection.js\").CollectionEvent} */ (evt).element);\n  }\n\n}\n\n/**\n * @classdesc\n * Handles snapping of vector features while modifying or drawing them.  The\n * features can come from a {@link module:ol/source/Vector} or {@link module:ol/Collection~Collection}\n * Any interaction object that allows the user to interact\n * with the features using the mouse can benefit from the snapping, as long\n * as it is added before.\n *\n * The snap interaction modifies map browser event `coordinate` and `pixel`\n * properties to force the snap to occur to any interaction that them.\n *\n * Example:\n *\n *     import Snap from 'ol/interaction/Snap';\n *\n *     var snap = new Snap({\n *       source: source\n *     });\n *\n * @api\n */\nclass Snap extends PointerInteraction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options ? opt_options : {};\n\n    const pointerOptions = /** @type {import(\"./Pointer.js\").Options} */ (options);\n\n    if (!pointerOptions.handleDownEvent) {\n      pointerOptions.handleDownEvent = TRUE;\n    }\n\n    if (!pointerOptions.stopDown) {\n      pointerOptions.stopDown = FALSE;\n    }\n\n    super(pointerOptions);\n\n    /**\n     * @type {import(\"../source/Vector.js\").default}\n     * @private\n     */\n    this.source_ = options.source ? options.source : null;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.vertex_ = options.vertex !== undefined ? options.vertex : true;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.edge_ = options.edge !== undefined ? options.edge : true;\n\n    /**\n     * @type {import(\"../Collection.js\").default<import(\"../Feature.js\").default>}\n     * @private\n     */\n    this.features_ = options.features ? options.features : null;\n\n    /**\n     * @type {Array<import(\"../events.js\").EventsKey>}\n     * @private\n     */\n    this.featuresListenerKeys_ = [];\n\n    /**\n     * @type {Object<string, import(\"../events.js\").EventsKey>}\n     * @private\n     */\n    this.featureChangeListenerKeys_ = {};\n\n    /**\n     * Extents are preserved so indexed segment can be quickly removed\n     * when its feature geometry changes\n     * @type {Object<string, import(\"../extent.js\").Extent>}\n     * @private\n     */\n    this.indexedFeaturesExtents_ = {};\n\n    /**\n     * If a feature geometry changes while a pointer drag|move event occurs, the\n     * feature doesn't get updated right away.  It will be at the next 'pointerup'\n     * event fired.\n     * @type {!Object<string, import(\"../Feature.js\").default>}\n     * @private\n     */\n    this.pendingFeatures_ = {};\n\n    /**\n     * Used for distance sorting in sortByDistance_\n     * @type {import(\"../coordinate.js\").Coordinate}\n     * @private\n     */\n    this.pixelCoordinate_ = null;\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.pixelTolerance_ = options.pixelTolerance !== undefined ?\n      options.pixelTolerance : 10;\n\n    /**\n     * @type {function(SegmentData, SegmentData): number}\n     * @private\n     */\n    this.sortByDistance_ = sortByDistance.bind(this);\n\n\n    /**\n    * Segment RTree for each layer\n    * @type {import(\"../structs/RBush.js\").default<SegmentData>}\n    * @private\n    */\n    this.rBush_ = new RBush();\n\n\n    /**\n    * @const\n    * @private\n    * @type {Object<string, function(import(\"../Feature.js\").default, import(\"../geom/Geometry.js\").default)>}\n    */\n    this.SEGMENT_WRITERS_ = {\n      'Point': this.writePointGeometry_,\n      'LineString': this.writeLineStringGeometry_,\n      'LinearRing': this.writeLineStringGeometry_,\n      'Polygon': this.writePolygonGeometry_,\n      'MultiPoint': this.writeMultiPointGeometry_,\n      'MultiLineString': this.writeMultiLineStringGeometry_,\n      'MultiPolygon': this.writeMultiPolygonGeometry_,\n      'GeometryCollection': this.writeGeometryCollectionGeometry_,\n      'Circle': this.writeCircleGeometry_\n    };\n  }\n\n  /**\n   * Add a feature to the collection of features that we may snap to.\n   * @param {import(\"../Feature.js\").default} feature Feature.\n   * @param {boolean=} opt_listen Whether to listen to the feature change or not\n   *     Defaults to `true`.\n   * @api\n   */\n  addFeature(feature, opt_listen) {\n    const register = opt_listen !== undefined ? opt_listen : true;\n    const feature_uid = getUid(feature);\n    const geometry = feature.getGeometry();\n    if (geometry) {\n      const segmentWriter = this.SEGMENT_WRITERS_[geometry.getType()];\n      if (segmentWriter) {\n        this.indexedFeaturesExtents_[feature_uid] = geometry.getExtent(createEmpty());\n        segmentWriter.call(this, feature, geometry);\n      }\n    }\n\n    if (register) {\n      this.featureChangeListenerKeys_[feature_uid] = listen(\n        feature,\n        EventType.CHANGE,\n        this.handleFeatureChange_, this);\n    }\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature.\n   * @private\n   */\n  forEachFeatureAdd_(feature) {\n    this.addFeature(feature);\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature.\n   * @private\n   */\n  forEachFeatureRemove_(feature) {\n    this.removeFeature(feature);\n  }\n\n  /**\n   * @return {import(\"../Collection.js\").default<import(\"../Feature.js\").default>|Array<import(\"../Feature.js\").default>} Features.\n   * @private\n   */\n  getFeatures_() {\n    let features;\n    if (this.features_) {\n      features = this.features_;\n    } else if (this.source_) {\n      features = this.source_.getFeatures();\n    }\n    return features;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleEvent(evt) {\n    const result = this.snapTo(evt.pixel, evt.coordinate, evt.map);\n    if (result.snapped) {\n      evt.coordinate = result.vertex.slice(0, 2);\n      evt.pixel = result.vertexPixel;\n    }\n    return super.handleEvent(evt);\n  }\n\n  /**\n   * @param {import(\"../source/Vector.js\").VectorSourceEvent|import(\"../Collection.js\").CollectionEvent} evt Event.\n   * @private\n   */\n  handleFeatureAdd_(evt) {\n    const feature = getFeatureFromEvent(evt);\n    this.addFeature(feature);\n  }\n\n  /**\n   * @param {import(\"../source/Vector.js\").VectorSourceEvent|import(\"../Collection.js\").CollectionEvent} evt Event.\n   * @private\n   */\n  handleFeatureRemove_(evt) {\n    const feature = getFeatureFromEvent(evt);\n    this.removeFeature(feature);\n  }\n\n  /**\n   * @param {import(\"../events/Event.js\").default} evt Event.\n   * @private\n   */\n  handleFeatureChange_(evt) {\n    const feature = /** @type {import(\"../Feature.js\").default} */ (evt.target);\n    if (this.handlingDownUpSequence) {\n      const uid = getUid(feature);\n      if (!(uid in this.pendingFeatures_)) {\n        this.pendingFeatures_[uid] = feature;\n      }\n    } else {\n      this.updateFeature_(feature);\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(evt) {\n    const featuresToUpdate = getValues(this.pendingFeatures_);\n    if (featuresToUpdate.length) {\n      featuresToUpdate.forEach(this.updateFeature_.bind(this));\n      this.pendingFeatures_ = {};\n    }\n    return false;\n  }\n\n  /**\n   * Remove a feature from the collection of features that we may snap to.\n   * @param {import(\"../Feature.js\").default} feature Feature\n   * @param {boolean=} opt_unlisten Whether to unlisten to the feature change\n   *     or not. Defaults to `true`.\n   * @api\n   */\n  removeFeature(feature, opt_unlisten) {\n    const unregister = opt_unlisten !== undefined ? opt_unlisten : true;\n    const feature_uid = getUid(feature);\n    const extent = this.indexedFeaturesExtents_[feature_uid];\n    if (extent) {\n      const rBush = this.rBush_;\n      const nodesToRemove = [];\n      rBush.forEachInExtent(extent, function(node) {\n        if (feature === node.feature) {\n          nodesToRemove.push(node);\n        }\n      });\n      for (let i = nodesToRemove.length - 1; i >= 0; --i) {\n        rBush.remove(nodesToRemove[i]);\n      }\n    }\n\n    if (unregister) {\n      unlistenByKey(this.featureChangeListenerKeys_[feature_uid]);\n      delete this.featureChangeListenerKeys_[feature_uid];\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setMap(map) {\n    const currentMap = this.getMap();\n    const keys = this.featuresListenerKeys_;\n    const features = /** @type {Array<import(\"../Feature.js\").default>} */ (this.getFeatures_());\n\n    if (currentMap) {\n      keys.forEach(unlistenByKey);\n      keys.length = 0;\n      features.forEach(this.forEachFeatureRemove_.bind(this));\n    }\n    super.setMap(map);\n\n    if (map) {\n      if (this.features_) {\n        keys.push(\n          listen(this.features_, CollectionEventType.ADD,\n            this.handleFeatureAdd_, this),\n          listen(this.features_, CollectionEventType.REMOVE,\n            this.handleFeatureRemove_, this)\n        );\n      } else if (this.source_) {\n        keys.push(\n          listen(this.source_, VectorEventType.ADDFEATURE,\n            this.handleFeatureAdd_, this),\n          listen(this.source_, VectorEventType.REMOVEFEATURE,\n            this.handleFeatureRemove_, this)\n        );\n      }\n      features.forEach(this.forEachFeatureAdd_.bind(this));\n    }\n  }\n\n  /**\n   * @param {import(\"../pixel.js\").Pixel} pixel Pixel\n   * @param {import(\"../coordinate.js\").Coordinate} pixelCoordinate Coordinate\n   * @param {import(\"../PluggableMap.js\").default} map Map.\n   * @return {Result} Snap result\n   */\n  snapTo(pixel, pixelCoordinate, map) {\n\n    const lowerLeft = map.getCoordinateFromPixel(\n      [pixel[0] - this.pixelTolerance_, pixel[1] + this.pixelTolerance_]);\n    const upperRight = map.getCoordinateFromPixel(\n      [pixel[0] + this.pixelTolerance_, pixel[1] - this.pixelTolerance_]);\n    const box = boundingExtent([lowerLeft, upperRight]);\n\n    let segments = this.rBush_.getInExtent(box);\n\n    // If snapping on vertices only, don't consider circles\n    if (this.vertex_ && !this.edge_) {\n      segments = segments.filter(function(segment) {\n        return segment.feature.getGeometry().getType() !==\n            GeometryType.CIRCLE;\n      });\n    }\n\n    let snappedToVertex = false;\n    let snapped = false;\n    let vertex = null;\n    let vertexPixel = null;\n    let dist, pixel1, pixel2, squaredDist1, squaredDist2;\n    if (segments.length > 0) {\n      this.pixelCoordinate_ = pixelCoordinate;\n      segments.sort(this.sortByDistance_);\n      const closestSegment = segments[0].segment;\n      const isCircle = segments[0].feature.getGeometry().getType() ===\n          GeometryType.CIRCLE;\n      if (this.vertex_ && !this.edge_) {\n        pixel1 = map.getPixelFromCoordinate(closestSegment[0]);\n        pixel2 = map.getPixelFromCoordinate(closestSegment[1]);\n        squaredDist1 = squaredCoordinateDistance(pixel, pixel1);\n        squaredDist2 = squaredCoordinateDistance(pixel, pixel2);\n        dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));\n        snappedToVertex = dist <= this.pixelTolerance_;\n        if (snappedToVertex) {\n          snapped = true;\n          vertex = squaredDist1 > squaredDist2 ? closestSegment[1] : closestSegment[0];\n          vertexPixel = map.getPixelFromCoordinate(vertex);\n        }\n      } else if (this.edge_) {\n        if (isCircle) {\n          vertex = closestOnCircle(pixelCoordinate,\n            /** @type {import(\"../geom/Circle.js\").default} */ (segments[0].feature.getGeometry()));\n        } else {\n          vertex = closestOnSegment(pixelCoordinate, closestSegment);\n        }\n        vertexPixel = map.getPixelFromCoordinate(vertex);\n        if (coordinateDistance(pixel, vertexPixel) <= this.pixelTolerance_) {\n          snapped = true;\n          if (this.vertex_ && !isCircle) {\n            pixel1 = map.getPixelFromCoordinate(closestSegment[0]);\n            pixel2 = map.getPixelFromCoordinate(closestSegment[1]);\n            squaredDist1 = squaredCoordinateDistance(vertexPixel, pixel1);\n            squaredDist2 = squaredCoordinateDistance(vertexPixel, pixel2);\n            dist = Math.sqrt(Math.min(squaredDist1, squaredDist2));\n            snappedToVertex = dist <= this.pixelTolerance_;\n            if (snappedToVertex) {\n              vertex = squaredDist1 > squaredDist2 ? closestSegment[1] : closestSegment[0];\n              vertexPixel = map.getPixelFromCoordinate(vertex);\n            }\n          }\n        }\n      }\n      if (snapped) {\n        vertexPixel = [Math.round(vertexPixel[0]), Math.round(vertexPixel[1])];\n      }\n    }\n    return (\n      /** @type {Result} */ ({\n        snapped: snapped,\n        vertex: vertex,\n        vertexPixel: vertexPixel\n      })\n    );\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature\n   * @private\n   */\n  updateFeature_(feature) {\n    this.removeFeature(feature, false);\n    this.addFeature(feature, false);\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature\n   * @param {import(\"../geom/Circle.js\").default} geometry Geometry.\n   * @private\n   */\n  writeCircleGeometry_(feature, geometry) {\n    const polygon = fromCircle(geometry);\n    const coordinates = polygon.getCoordinates()[0];\n    for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {\n      const segment = coordinates.slice(i, i + 2);\n      const segmentData = /** @type {SegmentData} */ ({\n        feature: feature,\n        segment: segment\n      });\n      this.rBush_.insert(boundingExtent(segment), segmentData);\n    }\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature\n   * @param {import(\"../geom/GeometryCollection.js\").default} geometry Geometry.\n   * @private\n   */\n  writeGeometryCollectionGeometry_(feature, geometry) {\n    const geometries = geometry.getGeometriesArray();\n    for (let i = 0; i < geometries.length; ++i) {\n      const segmentWriter = this.SEGMENT_WRITERS_[geometries[i].getType()];\n      if (segmentWriter) {\n        segmentWriter.call(this, feature, geometries[i]);\n      }\n    }\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature\n   * @param {import(\"../geom/LineString.js\").default} geometry Geometry.\n   * @private\n   */\n  writeLineStringGeometry_(feature, geometry) {\n    const coordinates = geometry.getCoordinates();\n    for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {\n      const segment = coordinates.slice(i, i + 2);\n      const segmentData = /** @type {SegmentData} */ ({\n        feature: feature,\n        segment: segment\n      });\n      this.rBush_.insert(boundingExtent(segment), segmentData);\n    }\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature\n   * @param {import(\"../geom/MultiLineString.js\").default} geometry Geometry.\n   * @private\n   */\n  writeMultiLineStringGeometry_(feature, geometry) {\n    const lines = geometry.getCoordinates();\n    for (let j = 0, jj = lines.length; j < jj; ++j) {\n      const coordinates = lines[j];\n      for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {\n        const segment = coordinates.slice(i, i + 2);\n        const segmentData = /** @type {SegmentData} */ ({\n          feature: feature,\n          segment: segment\n        });\n        this.rBush_.insert(boundingExtent(segment), segmentData);\n      }\n    }\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature\n   * @param {import(\"../geom/MultiPoint.js\").default} geometry Geometry.\n   * @private\n   */\n  writeMultiPointGeometry_(feature, geometry) {\n    const points = geometry.getCoordinates();\n    for (let i = 0, ii = points.length; i < ii; ++i) {\n      const coordinates = points[i];\n      const segmentData = /** @type {SegmentData} */ ({\n        feature: feature,\n        segment: [coordinates, coordinates]\n      });\n      this.rBush_.insert(geometry.getExtent(), segmentData);\n    }\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature\n   * @param {import(\"../geom/MultiPolygon.js\").default} geometry Geometry.\n   * @private\n   */\n  writeMultiPolygonGeometry_(feature, geometry) {\n    const polygons = geometry.getCoordinates();\n    for (let k = 0, kk = polygons.length; k < kk; ++k) {\n      const rings = polygons[k];\n      for (let j = 0, jj = rings.length; j < jj; ++j) {\n        const coordinates = rings[j];\n        for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {\n          const segment = coordinates.slice(i, i + 2);\n          const segmentData = /** @type {SegmentData} */ ({\n            feature: feature,\n            segment: segment\n          });\n          this.rBush_.insert(boundingExtent(segment), segmentData);\n        }\n      }\n    }\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature\n   * @param {import(\"../geom/Point.js\").default} geometry Geometry.\n   * @private\n   */\n  writePointGeometry_(feature, geometry) {\n    const coordinates = geometry.getCoordinates();\n    const segmentData = /** @type {SegmentData} */ ({\n      feature: feature,\n      segment: [coordinates, coordinates]\n    });\n    this.rBush_.insert(geometry.getExtent(), segmentData);\n  }\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature\n   * @param {import(\"../geom/Polygon.js\").default} geometry Geometry.\n   * @private\n   */\n  writePolygonGeometry_(feature, geometry) {\n    const rings = geometry.getCoordinates();\n    for (let j = 0, jj = rings.length; j < jj; ++j) {\n      const coordinates = rings[j];\n      for (let i = 0, ii = coordinates.length - 1; i < ii; ++i) {\n        const segment = coordinates.slice(i, i + 2);\n        const segmentData = /** @type {SegmentData} */ ({\n          feature: feature,\n          segment: segment\n        });\n        this.rBush_.insert(boundingExtent(segment), segmentData);\n      }\n    }\n  }\n}\n\n\n/**\n * Sort segments by distance, helper function\n * @param {SegmentData} a The first segment data.\n * @param {SegmentData} b The second segment data.\n * @return {number} The difference in distance.\n * @this {Snap}\n */\nfunction sortByDistance(a, b) {\n  const deltaA = squaredDistanceToSegment(this.pixelCoordinate_, a.segment);\n  const deltaB = squaredDistanceToSegment(this.pixelCoordinate_, b.segment);\n  return deltaA - deltaB;\n}\n\nexport default Snap;\n","/**\n * @module ol/interaction/Translate\n */\nimport Collection from '../Collection.js';\nimport {getChangeEventType} from '../Object.js';\nimport {listen} from '../events.js';\nimport Event from '../events/Event.js';\nimport {TRUE} from '../functions.js';\nimport {includes} from '../array.js';\nimport PointerInteraction from './Pointer.js';\nimport InteractionProperty from './Property.js';\n\n\n/**\n * @enum {string}\n */\nconst TranslateEventType = {\n  /**\n   * Triggered upon feature translation start.\n   * @event TranslateEvent#translatestart\n   * @api\n   */\n  TRANSLATESTART: 'translatestart',\n  /**\n   * Triggered upon feature translation.\n   * @event TranslateEvent#translating\n   * @api\n   */\n  TRANSLATING: 'translating',\n  /**\n   * Triggered upon feature translation end.\n   * @event TranslateEvent#translateend\n   * @api\n   */\n  TRANSLATEEND: 'translateend'\n};\n\n\n/**\n * @typedef {Object} Options\n * @property {Collection<import(\"../Feature.js\").default>} [features] Only features contained in this collection will be able to be translated. If\n * not specified, all features on the map will be able to be translated.\n * @property {Array<import(\"../layer/Layer.js\").default>|function(import(\"../layer/Layer.js\").default): boolean} [layers] A list of layers from which features should be\n * translated. Alternatively, a filter function can be provided. The\n * function will be called for each layer in the map and should return\n * `true` for layers that you want to be translatable. If the option is\n * absent, all visible layers will be considered translatable.\n * @property {number} [hitTolerance=0] Hit-detection tolerance. Pixels inside the radius around the given position\n * will be checked for features. This only works for the canvas renderer and\n * not for WebGL.\n */\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/interaction/Translate~Translate} instances\n * are instances of this type.\n */\nexport class TranslateEvent extends Event {\n  /**\n   * @param {TranslateEventType} type Type.\n   * @param {Collection<import(\"../Feature.js\").default>} features The features translated.\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate The event coordinate.\n   */\n  constructor(type, features, coordinate) {\n\n    super(type);\n\n    /**\n     * The features being translated.\n     * @type {Collection<import(\"../Feature.js\").default>}\n     * @api\n     */\n    this.features = features;\n\n    /**\n     * The coordinate of the drag event.\n     * @const\n     * @type {import(\"../coordinate.js\").Coordinate}\n     * @api\n     */\n    this.coordinate = coordinate;\n\n  }\n\n}\n\n\n/**\n * @classdesc\n * Interaction for translating (moving) features.\n *\n * @fires TranslateEvent\n * @api\n */\nclass Translate extends PointerInteraction {\n  /**\n   * @param {Options=} opt_options Options.\n   */\n  constructor(opt_options) {\n    const options = opt_options ? opt_options : {};\n\n    super(/** @type {import(\"./Pointer.js\").Options} */ (options));\n\n    /**\n     * The last position we translated to.\n     * @type {import(\"../coordinate.js\").Coordinate}\n     * @private\n     */\n    this.lastCoordinate_ = null;\n\n\n    /**\n     * @type {Collection<import(\"../Feature.js\").default>}\n     * @private\n     */\n    this.features_ = options.features !== undefined ? options.features : null;\n\n    /** @type {function(import(\"../layer/Layer.js\").default): boolean} */\n    let layerFilter;\n    if (options.layers) {\n      if (typeof options.layers === 'function') {\n        layerFilter = options.layers;\n      } else {\n        const layers = options.layers;\n        layerFilter = function(layer) {\n          return includes(layers, layer);\n        };\n      }\n    } else {\n      layerFilter = TRUE;\n    }\n\n    /**\n     * @private\n     * @type {function(import(\"../layer/Layer.js\").default): boolean}\n     */\n    this.layerFilter_ = layerFilter;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.hitTolerance_ = options.hitTolerance ? options.hitTolerance : 0;\n\n    /**\n     * @type {import(\"../Feature.js\").default}\n     * @private\n     */\n    this.lastFeature_ = null;\n\n    listen(this,\n      getChangeEventType(InteractionProperty.ACTIVE),\n      this.handleActiveChanged_, this);\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDownEvent(event) {\n    this.lastFeature_ = this.featuresAtPixel_(event.pixel, event.map);\n    if (!this.lastCoordinate_ && this.lastFeature_) {\n      this.lastCoordinate_ = event.coordinate;\n      this.handleMoveEvent(event);\n\n      const features = this.features_ || new Collection([this.lastFeature_]);\n\n      this.dispatchEvent(\n        new TranslateEvent(\n          TranslateEventType.TRANSLATESTART, features,\n          event.coordinate));\n      return true;\n    }\n    return false;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleUpEvent(event) {\n    if (this.lastCoordinate_) {\n      this.lastCoordinate_ = null;\n      this.handleMoveEvent(event);\n\n      const features = this.features_ || new Collection([this.lastFeature_]);\n\n      this.dispatchEvent(\n        new TranslateEvent(\n          TranslateEventType.TRANSLATEEND, features,\n          event.coordinate));\n      return true;\n    }\n    return false;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleDragEvent(event) {\n    if (this.lastCoordinate_) {\n      const newCoordinate = event.coordinate;\n      const deltaX = newCoordinate[0] - this.lastCoordinate_[0];\n      const deltaY = newCoordinate[1] - this.lastCoordinate_[1];\n\n      const features = this.features_ || new Collection([this.lastFeature_]);\n\n      features.forEach(function(feature) {\n        const geom = feature.getGeometry();\n        geom.translate(deltaX, deltaY);\n        feature.setGeometry(geom);\n      });\n\n      this.lastCoordinate_ = newCoordinate;\n      this.dispatchEvent(\n        new TranslateEvent(\n          TranslateEventType.TRANSLATING, features,\n          newCoordinate));\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  handleMoveEvent(event) {\n    const elem = event.map.getViewport();\n\n    // Change the cursor to grab/grabbing if hovering any of the features managed\n    // by the interaction\n    if (this.featuresAtPixel_(event.pixel, event.map)) {\n      elem.classList.remove(this.lastCoordinate_ ? 'ol-grab' : 'ol-grabbing');\n      elem.classList.add(this.lastCoordinate_ ? 'ol-grabbing' : 'ol-grab');\n    } else {\n      elem.classList.remove('ol-grab', 'ol-grabbing');\n    }\n  }\n\n  /**\n   * Tests to see if the given coordinates intersects any of our selected\n   * features.\n   * @param {import(\"../pixel.js\").Pixel} pixel Pixel coordinate to test for intersection.\n   * @param {import(\"../PluggableMap.js\").default} map Map to test the intersection on.\n   * @return {import(\"../Feature.js\").default} Returns the feature found at the specified pixel\n   * coordinates.\n   * @private\n   */\n  featuresAtPixel_(pixel, map) {\n    return map.forEachFeatureAtPixel(pixel,\n      function(feature) {\n        if (!this.features_ || includes(this.features_.getArray(), feature)) {\n          return feature;\n        }\n      }.bind(this), {\n        layerFilter: this.layerFilter_,\n        hitTolerance: this.hitTolerance_\n      });\n  }\n\n  /**\n   * Returns the Hit-detection tolerance.\n   * @returns {number} Hit tolerance in pixels.\n   * @api\n   */\n  getHitTolerance() {\n    return this.hitTolerance_;\n  }\n\n  /**\n   * Hit-detection tolerance. Pixels inside the radius around the given position\n   * will be checked for features. This only works for the canvas renderer and\n   * not for WebGL.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @api\n   */\n  setHitTolerance(hitTolerance) {\n    this.hitTolerance_ = hitTolerance;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setMap(map) {\n    const oldMap = this.getMap();\n    super.setMap(map);\n    this.updateState_(oldMap);\n  }\n\n  /**\n   * @private\n   */\n  handleActiveChanged_() {\n    this.updateState_(null);\n  }\n\n  /**\n   * @param {import(\"../PluggableMap.js\").default} oldMap Old map.\n   * @private\n   */\n  updateState_(oldMap) {\n    let map = this.getMap();\n    const active = this.getActive();\n    if (!map || !active) {\n      map = map || oldMap;\n      if (map) {\n        const elem = map.getViewport();\n        elem.classList.remove('ol-grab', 'ol-grabbing');\n      }\n    }\n  }\n}\n\nexport default Translate;\n","/**\n * @module ol/interaction\n */\nimport Collection from './Collection.js';\nimport Kinetic from './Kinetic.js';\nimport DoubleClickZoom from './interaction/DoubleClickZoom.js';\nimport DragPan from './interaction/DragPan.js';\nimport DragRotate from './interaction/DragRotate.js';\nimport DragZoom from './interaction/DragZoom.js';\nimport KeyboardPan from './interaction/KeyboardPan.js';\nimport KeyboardZoom from './interaction/KeyboardZoom.js';\nimport MouseWheelZoom from './interaction/MouseWheelZoom.js';\nimport PinchRotate from './interaction/PinchRotate.js';\nimport PinchZoom from './interaction/PinchZoom.js';\nimport {focus} from './events/condition.js';\n\nexport {default as DoubleClickZoom} from './interaction/DoubleClickZoom.js';\nexport {default as DragAndDrop} from './interaction/DragAndDrop.js';\nexport {default as DragBox} from './interaction/DragBox.js';\nexport {default as DragPan} from './interaction/DragPan.js';\nexport {default as DragRotate} from './interaction/DragRotate.js';\nexport {default as DragRotateAndZoom} from './interaction/DragRotateAndZoom.js';\nexport {default as DragZoom} from './interaction/DragZoom.js';\nexport {default as Draw} from './interaction/Draw.js';\nexport {default as Extent} from './interaction/Extent.js';\nexport {default as Interaction} from './interaction/Interaction.js';\nexport {default as KeyboardPan} from './interaction/KeyboardPan.js';\nexport {default as KeyboardZoom} from './interaction/KeyboardZoom.js';\nexport {default as Modify} from './interaction/Modify.js';\nexport {default as MouseWheelZoom} from './interaction/MouseWheelZoom.js';\nexport {default as PinchRotate} from './interaction/PinchRotate.js';\nexport {default as PinchZoom} from './interaction/PinchZoom.js';\nexport {default as Pointer} from './interaction/Pointer.js';\nexport {default as Select} from './interaction/Select.js';\nexport {default as Snap} from './interaction/Snap.js';\nexport {default as Translate} from './interaction/Translate.js';\n\n\n/**\n * @typedef {Object} DefaultsOptions\n * @property {boolean} [altShiftDragRotate=true] Whether Alt-Shift-drag rotate is\n * desired.\n * @property {boolean} [onFocusOnly=false] Interact only when the map has the\n * focus. This affects the `MouseWheelZoom` and `DragPan` interactions and is\n * useful when page scroll is desired for maps that do not have the browser's\n * focus.\n * @property {boolean} [constrainResolution=false] Zoom to the closest integer\n * zoom level after the wheel/trackpad or pinch gesture ends.\n * @property {boolean} [doubleClickZoom=true] Whether double click zoom is\n * desired.\n * @property {boolean} [keyboard=true] Whether keyboard interaction is desired.\n * @property {boolean} [mouseWheelZoom=true] Whether mousewheel zoom is desired.\n * @property {boolean} [shiftDragZoom=true] Whether Shift-drag zoom is desired.\n * @property {boolean} [dragPan=true] Whether drag pan is desired.\n * @property {boolean} [pinchRotate=true] Whether pinch rotate is desired.\n * @property {boolean} [pinchZoom=true] Whether pinch zoom is desired.\n * @property {number} [zoomDelta] Zoom level delta when using keyboard or\n * mousewheel zoom.\n * @property {number} [zoomDuration] Duration of the zoom animation in\n * milliseconds.\n */\n\n\n/**\n * Set of interactions included in maps by default. Specific interactions can be\n * excluded by setting the appropriate option to false in the constructor\n * options, but the order of the interactions is fixed.  If you want to specify\n * a different order for interactions, you will need to create your own\n * {@link module:ol/interaction/Interaction} instances and insert\n * them into a {@link module:ol/Collection} in the order you want\n * before creating your {@link module:ol/Map~Map} instance. The default set of\n * interactions, in sequence, is:\n * * {@link module:ol/interaction/DragRotate~DragRotate}\n * * {@link module:ol/interaction/DoubleClickZoom~DoubleClickZoom}\n * * {@link module:ol/interaction/DragPan~DragPan}\n * * {@link module:ol/interaction/PinchRotate~PinchRotate}\n * * {@link module:ol/interaction/PinchZoom~PinchZoom}\n * * {@link module:ol/interaction/KeyboardPan~KeyboardPan}\n * * {@link module:ol/interaction/KeyboardZoom~KeyboardZoom}\n * * {@link module:ol/interaction/MouseWheelZoom~MouseWheelZoom}\n * * {@link module:ol/interaction/DragZoom~DragZoom}\n *\n * @param {DefaultsOptions=} opt_options Defaults options.\n * @return {import(\"./Collection.js\").default<import(\"./interaction/Interaction.js\").default>}\n * A collection of interactions to be used with the {@link module:ol/Map~Map}\n * constructor's `interactions` option.\n * @api\n */\nexport function defaults(opt_options) {\n\n  const options = opt_options ? opt_options : {};\n\n  const interactions = new Collection();\n\n  const kinetic = new Kinetic(-0.005, 0.05, 100);\n\n  const altShiftDragRotate = options.altShiftDragRotate !== undefined ?\n    options.altShiftDragRotate : true;\n  if (altShiftDragRotate) {\n    interactions.push(new DragRotate());\n  }\n\n  const doubleClickZoom = options.doubleClickZoom !== undefined ?\n    options.doubleClickZoom : true;\n  if (doubleClickZoom) {\n    interactions.push(new DoubleClickZoom({\n      delta: options.zoomDelta,\n      duration: options.zoomDuration\n    }));\n  }\n\n  const dragPan = options.dragPan !== undefined ? options.dragPan : true;\n  if (dragPan) {\n    interactions.push(new DragPan({\n      condition: options.onFocusOnly ? focus : undefined,\n      kinetic: kinetic\n    }));\n  }\n\n  const pinchRotate = options.pinchRotate !== undefined ? options.pinchRotate :\n    true;\n  if (pinchRotate) {\n    interactions.push(new PinchRotate());\n  }\n\n  const pinchZoom = options.pinchZoom !== undefined ? options.pinchZoom : true;\n  if (pinchZoom) {\n    interactions.push(new PinchZoom({\n      constrainResolution: options.constrainResolution,\n      duration: options.zoomDuration\n    }));\n  }\n\n  const keyboard = options.keyboard !== undefined ? options.keyboard : true;\n  if (keyboard) {\n    interactions.push(new KeyboardPan());\n    interactions.push(new KeyboardZoom({\n      delta: options.zoomDelta,\n      duration: options.zoomDuration\n    }));\n  }\n\n  const mouseWheelZoom = options.mouseWheelZoom !== undefined ?\n    options.mouseWheelZoom : true;\n  if (mouseWheelZoom) {\n    interactions.push(new MouseWheelZoom({\n      condition: options.onFocusOnly ? focus : undefined,\n      constrainResolution: options.constrainResolution,\n      duration: options.zoomDuration\n    }));\n  }\n\n  const shiftDragZoom = options.shiftDragZoom !== undefined ?\n    options.shiftDragZoom : true;\n  if (shiftDragZoom) {\n    interactions.push(new DragZoom({\n      duration: options.zoomDuration\n    }));\n  }\n\n  return interactions;\n\n}\n","/**\n * @module ol/reproj/common\n */\n\n/**\n * Default maximum allowed threshold  (in pixels) for reprojection\n * triangulation.\n * @type {number}\n */\nexport const ERROR_THRESHOLD = 0.5;\n\n/**\n * Enable automatic reprojection of raster sources. Default is `true`.\n * TODO: decide if we want to expose this as a build flag or remove it\n * @type {boolean}\n */\nexport const ENABLE_RASTER_REPROJECTION = true;\n","/**\n * @module ol/ImageBase\n */\nimport {abstract} from './util.js';\nimport EventTarget from './events/Target.js';\nimport EventType from './events/EventType.js';\n\n/**\n * @abstract\n */\nclass ImageBase extends EventTarget {\n\n  /**\n   * @param {import(\"./extent.js\").Extent} extent Extent.\n   * @param {number|undefined} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"./ImageState.js\").default} state State.\n   */\n  constructor(extent, resolution, pixelRatio, state) {\n\n    super();\n\n    /**\n     * @protected\n     * @type {import(\"./extent.js\").Extent}\n     */\n    this.extent = extent;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelRatio_ = pixelRatio;\n\n    /**\n     * @protected\n     * @type {number|undefined}\n     */\n    this.resolution = resolution;\n\n    /**\n     * @protected\n     * @type {import(\"./ImageState.js\").default}\n     */\n    this.state = state;\n\n  }\n\n  /**\n   * @protected\n   */\n  changed() {\n    this.dispatchEvent(EventType.CHANGE);\n  }\n\n  /**\n   * @return {import(\"./extent.js\").Extent} Extent.\n   */\n  getExtent() {\n    return this.extent;\n  }\n\n  /**\n   * @abstract\n   * @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.\n   */\n  getImage() {\n    return abstract();\n  }\n\n  /**\n   * @return {number} PixelRatio.\n   */\n  getPixelRatio() {\n    return this.pixelRatio_;\n  }\n\n  /**\n   * @return {number} Resolution.\n   */\n  getResolution() {\n    return /** @type {number} */ (this.resolution);\n  }\n\n  /**\n   * @return {import(\"./ImageState.js\").default} State.\n   */\n  getState() {\n    return this.state;\n  }\n\n  /**\n   * Load not yet loaded URI.\n   * @abstract\n   */\n  load() {\n    abstract();\n  }\n}\n\n\nexport default ImageBase;\n","/**\n * @module ol/ImageCanvas\n */\nimport ImageBase from './ImageBase.js';\nimport ImageState from './ImageState.js';\n\n\n/**\n * A function that is called to trigger asynchronous canvas drawing.  It is\n * called with a \"done\" callback that should be called when drawing is done.\n * If any error occurs during drawing, the \"done\" callback should be called with\n * that error.\n *\n * @typedef {function(function(Error=))} Loader\n */\n\n\nclass ImageCanvas extends ImageBase {\n\n  /**\n   * @param {import(\"./extent.js\").Extent} extent Extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {HTMLCanvasElement} canvas Canvas.\n   * @param {Loader=} opt_loader Optional loader function to\n   *     support asynchronous canvas drawing.\n   */\n  constructor(extent, resolution, pixelRatio, canvas, opt_loader) {\n\n    const state = opt_loader !== undefined ? ImageState.IDLE : ImageState.LOADED;\n\n    super(extent, resolution, pixelRatio, state);\n\n    /**\n     * Optional canvas loader function.\n     * @type {?Loader}\n     * @private\n     */\n    this.loader_ = opt_loader !== undefined ? opt_loader : null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.canvas_ = canvas;\n\n    /**\n     * @private\n     * @type {Error}\n     */\n    this.error_ = null;\n\n  }\n\n  /**\n   * Get any error associated with asynchronous rendering.\n   * @return {Error} Any error that occurred during rendering.\n   */\n  getError() {\n    return this.error_;\n  }\n\n  /**\n   * Handle async drawing complete.\n   * @param {Error=} err Any error during drawing.\n   * @private\n   */\n  handleLoad_(err) {\n    if (err) {\n      this.error_ = err;\n      this.state = ImageState.ERROR;\n    } else {\n      this.state = ImageState.LOADED;\n    }\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  load() {\n    if (this.state == ImageState.IDLE) {\n      this.state = ImageState.LOADING;\n      this.changed();\n      this.loader_(this.handleLoad_.bind(this));\n    }\n  }\n\n  /**\n   * @return {HTMLCanvasElement} Canvas element.\n   */\n  getImage() {\n    return this.canvas_;\n  }\n}\n\n\nexport default ImageCanvas;\n","/**\n * @module ol/render/Event\n */\n\nimport Event from '../events/Event.js';\n\nclass RenderEvent extends Event {\n\n  /**\n   * @param {import(\"./EventType.js\").default} type Type.\n   * @param {import(\"./VectorContext.js\").default=} opt_vectorContext Vector context.\n   * @param {import(\"../PluggableMap.js\").FrameState=} opt_frameState Frame state.\n   * @param {?CanvasRenderingContext2D=} opt_context Context.\n   * @param {?import(\"../webgl/Context.js\").default=} opt_glContext WebGL Context.\n   */\n  constructor(type, opt_vectorContext, opt_frameState, opt_context, opt_glContext) {\n\n    super(type);\n\n    /**\n     * For canvas, this is an instance of {@link module:ol/render/canvas/Immediate}.\n     * @type {import(\"./VectorContext.js\").default|undefined}\n     * @api\n     */\n    this.vectorContext = opt_vectorContext;\n\n    /**\n     * An object representing the current render frame state.\n     * @type {import(\"../PluggableMap.js\").FrameState|undefined}\n     * @api\n     */\n    this.frameState = opt_frameState;\n\n    /**\n     * Canvas context. Only available when a Canvas renderer is used, null\n     * otherwise.\n     * @type {CanvasRenderingContext2D|null|undefined}\n     * @api\n     */\n    this.context = opt_context;\n\n    /**\n     * WebGL context. Only available when a WebGL renderer is used, null\n     * otherwise.\n     * @type {import(\"../webgl/Context.js\").default|null|undefined}\n     * @api\n     */\n    this.glContext = opt_glContext;\n\n  }\n\n}\n\nexport default RenderEvent;\n","/**\n * @module ol/render/VectorContext\n */\n\n/**\n * @classdesc\n * Context for drawing geometries.  A vector context is available on render\n * events and does not need to be constructed directly.\n * @api\n */\nclass VectorContext {\n  /**\n   * Render a geometry with a custom renderer.\n   *\n   * @param {import(\"../geom/SimpleGeometry.js\").default} geometry Geometry.\n   * @param {import(\"../Feature.js\").default|import(\"./Feature.js\").default} feature Feature.\n   * @param {Function} renderer Renderer.\n   */\n  drawCustom(geometry, feature, renderer) {}\n\n  /**\n   * Render a geometry.\n   *\n   * @param {import(\"../geom/Geometry.js\").default} geometry The geometry to render.\n   */\n  drawGeometry(geometry) {}\n\n  /**\n   * Set the rendering style.\n   *\n   * @param {import(\"../style/Style.js\").default} style The rendering style.\n   */\n  setStyle(style) {}\n\n  /**\n   * @param {import(\"../geom/Circle.js\").default} circleGeometry Circle geometry.\n   * @param {import(\"../Feature.js\").default} feature Feature.\n   */\n  drawCircle(circleGeometry, feature) {}\n\n  /**\n   * @param {import(\"../Feature.js\").default} feature Feature.\n   * @param {import(\"../style/Style.js\").default} style Style.\n   */\n  drawFeature(feature, style) {}\n\n  /**\n   * @param {import(\"../geom/GeometryCollection.js\").default} geometryCollectionGeometry Geometry collection.\n   * @param {import(\"../Feature.js\").default} feature Feature.\n   */\n  drawGeometryCollection(geometryCollectionGeometry, feature) {}\n\n  /**\n   * @param {import(\"../geom/LineString.js\").default|import(\"./Feature.js\").default} lineStringGeometry Line string geometry.\n   * @param {import(\"../Feature.js\").default|import(\"./Feature.js\").default} feature Feature.\n   */\n  drawLineString(lineStringGeometry, feature) {}\n\n  /**\n   * @param {import(\"../geom/MultiLineString.js\").default|import(\"./Feature.js\").default} multiLineStringGeometry MultiLineString geometry.\n   * @param {import(\"../Feature.js\").default|import(\"./Feature.js\").default} feature Feature.\n   */\n  drawMultiLineString(multiLineStringGeometry, feature) {}\n\n  /**\n   * @param {import(\"../geom/MultiPoint.js\").default|import(\"./Feature.js\").default} multiPointGeometry MultiPoint geometry.\n   * @param {import(\"../Feature.js\").default|import(\"./Feature.js\").default} feature Feature.\n   */\n  drawMultiPoint(multiPointGeometry, feature) {}\n\n  /**\n   * @param {import(\"../geom/MultiPolygon.js\").default} multiPolygonGeometry MultiPolygon geometry.\n   * @param {import(\"../Feature.js\").default|import(\"./Feature.js\").default} feature Feature.\n   */\n  drawMultiPolygon(multiPolygonGeometry, feature) {}\n\n  /**\n   * @param {import(\"../geom/Point.js\").default|import(\"./Feature.js\").default} pointGeometry Point geometry.\n   * @param {import(\"../Feature.js\").default|import(\"./Feature.js\").default} feature Feature.\n   */\n  drawPoint(pointGeometry, feature) {}\n\n  /**\n   * @param {import(\"../geom/Polygon.js\").default|import(\"./Feature.js\").default} polygonGeometry Polygon geometry.\n   * @param {import(\"../Feature.js\").default|import(\"./Feature.js\").default} feature Feature.\n   */\n  drawPolygon(polygonGeometry, feature) {}\n\n  /**\n   * @param {import(\"../geom/Geometry.js\").default|import(\"./Feature.js\").default} geometry Geometry.\n   * @param {import(\"../Feature.js\").default|import(\"./Feature.js\").default} feature Feature.\n   */\n  drawText(geometry, feature) {}\n\n  /**\n   * @param {import(\"../style/Fill.js\").default} fillStyle Fill style.\n   * @param {import(\"../style/Stroke.js\").default} strokeStyle Stroke style.\n   */\n  setFillStrokeStyle(fillStyle, strokeStyle) {}\n\n  /**\n   * @param {import(\"../style/Image.js\").default} imageStyle Image style.\n   * @param {import(\"./canvas.js\").DeclutterGroup=} opt_declutterGroup Declutter.\n   */\n  setImageStyle(imageStyle, opt_declutterGroup) {}\n\n  /**\n   * @param {import(\"../style/Text.js\").default} textStyle Text style.\n   * @param {import(\"./canvas.js\").DeclutterGroup=} opt_declutterGroup Declutter.\n   */\n  setTextStyle(textStyle, opt_declutterGroup) {}\n}\n\nexport default VectorContext;\n","/**\n * @module ol/render/canvas/Immediate\n */\n// FIXME test, especially polygons with holes and multipolygons\n// FIXME need to handle large thick features (where pixel size matters)\n// FIXME add offset and end to ol/geom/flat/transform~transform2D?\n\nimport {equals} from '../../array.js';\nimport {asColorLike} from '../../colorlike.js';\nimport {intersects} from '../../extent.js';\nimport GeometryType from '../../geom/GeometryType.js';\nimport {transformGeom2D} from '../../geom/SimpleGeometry.js';\nimport {transform2D} from '../../geom/flat/transform.js';\nimport {CANVAS_LINE_DASH} from '../../has.js';\nimport VectorContext from '../VectorContext.js';\nimport {defaultTextAlign, defaultFillStyle, defaultLineCap, defaultLineDash, defaultLineDashOffset, defaultLineJoin, defaultLineWidth, defaultMiterLimit, defaultStrokeStyle, defaultTextBaseline, defaultFont} from '../canvas.js';\nimport {create as createTransform, compose as composeTransform} from '../../transform.js';\n\n/**\n * @classdesc\n * A concrete subclass of {@link module:ol/render/VectorContext} that implements\n * direct rendering of features and geometries to an HTML5 Canvas context.\n * Instances of this class are created internally by the library and\n * provided to application code as vectorContext member of the\n * {@link module:ol/render/Event~RenderEvent} object associated with postcompose, precompose and\n * render events emitted by layers and maps.\n */\nclass CanvasImmediateRenderer extends VectorContext {\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"../../extent.js\").Extent} extent Extent.\n   * @param {import(\"../../transform.js\").Transform} transform Transform.\n   * @param {number} viewRotation View rotation.\n   */\n  constructor(context, pixelRatio, extent, transform, viewRotation) {\n    super();\n\n    /**\n     * @private\n     * @type {CanvasRenderingContext2D}\n     */\n    this.context_ = context;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelRatio_ = pixelRatio;\n\n    /**\n     * @private\n     * @type {import(\"../../extent.js\").Extent}\n     */\n    this.extent_ = extent;\n\n    /**\n     * @private\n     * @type {import(\"../../transform.js\").Transform}\n     */\n    this.transform_ = transform;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.viewRotation_ = viewRotation;\n\n    /**\n     * @private\n     * @type {?import(\"../canvas.js\").FillState}\n     */\n    this.contextFillState_ = null;\n\n    /**\n     * @private\n     * @type {?import(\"../canvas.js\").StrokeState}\n     */\n    this.contextStrokeState_ = null;\n\n    /**\n     * @private\n     * @type {?import(\"../canvas.js\").TextState}\n     */\n    this.contextTextState_ = null;\n\n    /**\n     * @private\n     * @type {?import(\"../canvas.js\").FillState}\n     */\n    this.fillState_ = null;\n\n    /**\n     * @private\n     * @type {?import(\"../canvas.js\").StrokeState}\n     */\n    this.strokeState_ = null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement}\n     */\n    this.image_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageAnchorX_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageAnchorY_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageHeight_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageOpacity_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageOriginX_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageOriginY_ = 0;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.imageRotateWithView_ = false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageRotation_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageScale_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.imageWidth_ = 0;\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.text_ = '';\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textOffsetX_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textOffsetY_ = 0;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.textRotateWithView_ = false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textRotation_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textScale_ = 0;\n\n    /**\n     * @private\n     * @type {?import(\"../canvas.js\").FillState}\n     */\n    this.textFillState_ = null;\n\n    /**\n     * @private\n     * @type {?import(\"../canvas.js\").StrokeState}\n     */\n    this.textStrokeState_ = null;\n\n    /**\n     * @private\n     * @type {?import(\"../canvas.js\").TextState}\n     */\n    this.textState_ = null;\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.pixelCoordinates_ = [];\n\n    /**\n     * @private\n     * @type {import(\"../../transform.js\").Transform}\n     */\n    this.tmpLocalTransform_ = createTransform();\n\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @private\n   */\n  drawImages_(flatCoordinates, offset, end, stride) {\n    if (!this.image_) {\n      return;\n    }\n    const pixelCoordinates = transform2D(\n      flatCoordinates, offset, end, 2, this.transform_,\n      this.pixelCoordinates_);\n    const context = this.context_;\n    const localTransform = this.tmpLocalTransform_;\n    const alpha = context.globalAlpha;\n    if (this.imageOpacity_ != 1) {\n      context.globalAlpha = alpha * this.imageOpacity_;\n    }\n    let rotation = this.imageRotation_;\n    if (this.imageRotateWithView_) {\n      rotation += this.viewRotation_;\n    }\n    for (let i = 0, ii = pixelCoordinates.length; i < ii; i += 2) {\n      const x = pixelCoordinates[i] - this.imageAnchorX_;\n      const y = pixelCoordinates[i + 1] - this.imageAnchorY_;\n      if (rotation !== 0 || this.imageScale_ != 1) {\n        const centerX = x + this.imageAnchorX_;\n        const centerY = y + this.imageAnchorY_;\n        composeTransform(localTransform,\n          centerX, centerY,\n          this.imageScale_, this.imageScale_,\n          rotation,\n          -centerX, -centerY);\n        context.setTransform.apply(context, localTransform);\n      }\n      context.drawImage(this.image_, this.imageOriginX_, this.imageOriginY_,\n        this.imageWidth_, this.imageHeight_, x, y,\n        this.imageWidth_, this.imageHeight_);\n    }\n    if (rotation !== 0 || this.imageScale_ != 1) {\n      context.setTransform(1, 0, 0, 1, 0, 0);\n    }\n    if (this.imageOpacity_ != 1) {\n      context.globalAlpha = alpha;\n    }\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @private\n   */\n  drawText_(flatCoordinates, offset, end, stride) {\n    if (!this.textState_ || this.text_ === '') {\n      return;\n    }\n    if (this.textFillState_) {\n      this.setContextFillState_(this.textFillState_);\n    }\n    if (this.textStrokeState_) {\n      this.setContextStrokeState_(this.textStrokeState_);\n    }\n    this.setContextTextState_(this.textState_);\n    const pixelCoordinates = transform2D(\n      flatCoordinates, offset, end, stride, this.transform_,\n      this.pixelCoordinates_);\n    const context = this.context_;\n    let rotation = this.textRotation_;\n    if (this.textRotateWithView_) {\n      rotation += this.viewRotation_;\n    }\n    for (; offset < end; offset += stride) {\n      const x = pixelCoordinates[offset] + this.textOffsetX_;\n      const y = pixelCoordinates[offset + 1] + this.textOffsetY_;\n      if (rotation !== 0 || this.textScale_ != 1) {\n        const localTransform = composeTransform(this.tmpLocalTransform_,\n          x, y,\n          this.textScale_, this.textScale_,\n          rotation,\n          -x, -y);\n        context.setTransform.apply(context, localTransform);\n      }\n      if (this.textStrokeState_) {\n        context.strokeText(this.text_, x, y);\n      }\n      if (this.textFillState_) {\n        context.fillText(this.text_, x, y);\n      }\n    }\n    if (rotation !== 0 || this.textScale_ != 1) {\n      context.setTransform(1, 0, 0, 1, 0, 0);\n    }\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @param {boolean} close Close.\n   * @private\n   * @return {number} end End.\n   */\n  moveToLineTo_(flatCoordinates, offset, end, stride, close) {\n    const context = this.context_;\n    const pixelCoordinates = transform2D(\n      flatCoordinates, offset, end, stride, this.transform_,\n      this.pixelCoordinates_);\n    context.moveTo(pixelCoordinates[0], pixelCoordinates[1]);\n    let length = pixelCoordinates.length;\n    if (close) {\n      length -= 2;\n    }\n    for (let i = 2; i < length; i += 2) {\n      context.lineTo(pixelCoordinates[i], pixelCoordinates[i + 1]);\n    }\n    if (close) {\n      context.closePath();\n    }\n    return end;\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {Array<number>} ends Ends.\n   * @param {number} stride Stride.\n   * @private\n   * @return {number} End.\n   */\n  drawRings_(flatCoordinates, offset, ends, stride) {\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      offset = this.moveToLineTo_(flatCoordinates, offset, ends[i], stride, true);\n    }\n    return offset;\n  }\n\n  /**\n   * Render a circle geometry into the canvas.  Rendering is immediate and uses\n   * the current fill and stroke styles.\n   *\n   * @param {import(\"../../geom/Circle.js\").default} geometry Circle geometry.\n   * @override\n   * @api\n   */\n  drawCircle(geometry) {\n    if (!intersects(this.extent_, geometry.getExtent())) {\n      return;\n    }\n    if (this.fillState_ || this.strokeState_) {\n      if (this.fillState_) {\n        this.setContextFillState_(this.fillState_);\n      }\n      if (this.strokeState_) {\n        this.setContextStrokeState_(this.strokeState_);\n      }\n      const pixelCoordinates = transformGeom2D(\n        geometry, this.transform_, this.pixelCoordinates_);\n      const dx = pixelCoordinates[2] - pixelCoordinates[0];\n      const dy = pixelCoordinates[3] - pixelCoordinates[1];\n      const radius = Math.sqrt(dx * dx + dy * dy);\n      const context = this.context_;\n      context.beginPath();\n      context.arc(\n        pixelCoordinates[0], pixelCoordinates[1], radius, 0, 2 * Math.PI);\n      if (this.fillState_) {\n        context.fill();\n      }\n      if (this.strokeState_) {\n        context.stroke();\n      }\n    }\n    if (this.text_ !== '') {\n      this.drawText_(geometry.getCenter(), 0, 2, 2);\n    }\n  }\n\n  /**\n   * Set the rendering style.  Note that since this is an immediate rendering API,\n   * any `zIndex` on the provided style will be ignored.\n   *\n   * @param {import(\"../../style/Style.js\").default} style The rendering style.\n   * @override\n   * @api\n   */\n  setStyle(style) {\n    this.setFillStrokeStyle(style.getFill(), style.getStroke());\n    this.setImageStyle(style.getImage());\n    this.setTextStyle(style.getText());\n  }\n\n  /**\n   * Render a geometry into the canvas.  Call\n   * {@link module:ol/render/canvas/Immediate#setStyle} first to set the rendering style.\n   *\n   * @param {import(\"../../geom/Geometry.js\").default|import(\"../Feature.js\").default} geometry The geometry to render.\n   * @override\n   * @api\n   */\n  drawGeometry(geometry) {\n    const type = geometry.getType();\n    switch (type) {\n      case GeometryType.POINT:\n        this.drawPoint(/** @type {import(\"../../geom/Point.js\").default} */ (geometry));\n        break;\n      case GeometryType.LINE_STRING:\n        this.drawLineString(/** @type {import(\"../../geom/LineString.js\").default} */ (geometry));\n        break;\n      case GeometryType.POLYGON:\n        this.drawPolygon(/** @type {import(\"../../geom/Polygon.js\").default} */ (geometry));\n        break;\n      case GeometryType.MULTI_POINT:\n        this.drawMultiPoint(/** @type {import(\"../../geom/MultiPoint.js\").default} */ (geometry));\n        break;\n      case GeometryType.MULTI_LINE_STRING:\n        this.drawMultiLineString(/** @type {import(\"../../geom/MultiLineString.js\").default} */ (geometry));\n        break;\n      case GeometryType.MULTI_POLYGON:\n        this.drawMultiPolygon(/** @type {import(\"../../geom/MultiPolygon.js\").default} */ (geometry));\n        break;\n      case GeometryType.GEOMETRY_COLLECTION:\n        this.drawGeometryCollection(/** @type {import(\"../../geom/GeometryCollection.js\").default} */ (geometry));\n        break;\n      case GeometryType.CIRCLE:\n        this.drawCircle(/** @type {import(\"../../geom/Circle.js\").default} */ (geometry));\n        break;\n      default:\n    }\n  }\n\n  /**\n   * Render a feature into the canvas.  Note that any `zIndex` on the provided\n   * style will be ignored - features are rendered immediately in the order that\n   * this method is called.  If you need `zIndex` support, you should be using an\n   * {@link module:ol/layer/Vector~VectorLayer} instead.\n   *\n   * @param {import(\"../../Feature.js\").default} feature Feature.\n   * @param {import(\"../../style/Style.js\").default} style Style.\n   * @override\n   * @api\n   */\n  drawFeature(feature, style) {\n    const geometry = style.getGeometryFunction()(feature);\n    if (!geometry || !intersects(this.extent_, geometry.getExtent())) {\n      return;\n    }\n    this.setStyle(style);\n    this.drawGeometry(geometry);\n  }\n\n  /**\n   * Render a GeometryCollection to the canvas.  Rendering is immediate and\n   * uses the current styles appropriate for each geometry in the collection.\n   *\n   * @param {import(\"../../geom/GeometryCollection.js\").default} geometry Geometry collection.\n   * @override\n   */\n  drawGeometryCollection(geometry) {\n    const geometries = geometry.getGeometriesArray();\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      this.drawGeometry(geometries[i]);\n    }\n  }\n\n  /**\n   * Render a Point geometry into the canvas.  Rendering is immediate and uses\n   * the current style.\n   *\n   * @param {import(\"../../geom/Point.js\").default|import(\"../Feature.js\").default} geometry Point geometry.\n   * @override\n   */\n  drawPoint(geometry) {\n    const flatCoordinates = geometry.getFlatCoordinates();\n    const stride = geometry.getStride();\n    if (this.image_) {\n      this.drawImages_(flatCoordinates, 0, flatCoordinates.length, stride);\n    }\n    if (this.text_ !== '') {\n      this.drawText_(flatCoordinates, 0, flatCoordinates.length, stride);\n    }\n  }\n\n  /**\n   * Render a MultiPoint geometry  into the canvas.  Rendering is immediate and\n   * uses the current style.\n   *\n   * @param {import(\"../../geom/MultiPoint.js\").default|import(\"../Feature.js\").default} geometry MultiPoint geometry.\n   * @override\n   */\n  drawMultiPoint(geometry) {\n    const flatCoordinates = geometry.getFlatCoordinates();\n    const stride = geometry.getStride();\n    if (this.image_) {\n      this.drawImages_(flatCoordinates, 0, flatCoordinates.length, stride);\n    }\n    if (this.text_ !== '') {\n      this.drawText_(flatCoordinates, 0, flatCoordinates.length, stride);\n    }\n  }\n\n  /**\n   * Render a LineString into the canvas.  Rendering is immediate and uses\n   * the current style.\n   *\n   * @param {import(\"../../geom/LineString.js\").default|import(\"../Feature.js\").default} geometry LineString geometry.\n   * @override\n   */\n  drawLineString(geometry) {\n    if (!intersects(this.extent_, geometry.getExtent())) {\n      return;\n    }\n    if (this.strokeState_) {\n      this.setContextStrokeState_(this.strokeState_);\n      const context = this.context_;\n      const flatCoordinates = geometry.getFlatCoordinates();\n      context.beginPath();\n      this.moveToLineTo_(flatCoordinates, 0, flatCoordinates.length,\n        geometry.getStride(), false);\n      context.stroke();\n    }\n    if (this.text_ !== '') {\n      const flatMidpoint = geometry.getFlatMidpoint();\n      this.drawText_(flatMidpoint, 0, 2, 2);\n    }\n  }\n\n  /**\n   * Render a MultiLineString geometry into the canvas.  Rendering is immediate\n   * and uses the current style.\n   *\n   * @param {import(\"../../geom/MultiLineString.js\").default|import(\"../Feature.js\").default} geometry MultiLineString geometry.\n   * @override\n   */\n  drawMultiLineString(geometry) {\n    const geometryExtent = geometry.getExtent();\n    if (!intersects(this.extent_, geometryExtent)) {\n      return;\n    }\n    if (this.strokeState_) {\n      this.setContextStrokeState_(this.strokeState_);\n      const context = this.context_;\n      const flatCoordinates = geometry.getFlatCoordinates();\n      let offset = 0;\n      const ends = /** @type {Array<number>} */ (geometry.getEnds());\n      const stride = geometry.getStride();\n      context.beginPath();\n      for (let i = 0, ii = ends.length; i < ii; ++i) {\n        offset = this.moveToLineTo_(flatCoordinates, offset, ends[i], stride, false);\n      }\n      context.stroke();\n    }\n    if (this.text_ !== '') {\n      const flatMidpoints = geometry.getFlatMidpoints();\n      this.drawText_(flatMidpoints, 0, flatMidpoints.length, 2);\n    }\n  }\n\n  /**\n   * Render a Polygon geometry into the canvas.  Rendering is immediate and uses\n   * the current style.\n   *\n   * @param {import(\"../../geom/Polygon.js\").default|import(\"../Feature.js\").default} geometry Polygon geometry.\n   * @override\n   */\n  drawPolygon(geometry) {\n    if (!intersects(this.extent_, geometry.getExtent())) {\n      return;\n    }\n    if (this.strokeState_ || this.fillState_) {\n      if (this.fillState_) {\n        this.setContextFillState_(this.fillState_);\n      }\n      if (this.strokeState_) {\n        this.setContextStrokeState_(this.strokeState_);\n      }\n      const context = this.context_;\n      context.beginPath();\n      this.drawRings_(geometry.getOrientedFlatCoordinates(),\n        0, /** @type {Array<number>} */ (geometry.getEnds()), geometry.getStride());\n      if (this.fillState_) {\n        context.fill();\n      }\n      if (this.strokeState_) {\n        context.stroke();\n      }\n    }\n    if (this.text_ !== '') {\n      const flatInteriorPoint = geometry.getFlatInteriorPoint();\n      this.drawText_(flatInteriorPoint, 0, 2, 2);\n    }\n  }\n\n  /**\n   * Render MultiPolygon geometry into the canvas.  Rendering is immediate and\n   * uses the current style.\n   * @param {import(\"../../geom/MultiPolygon.js\").default} geometry MultiPolygon geometry.\n   * @override\n   */\n  drawMultiPolygon(geometry) {\n    if (!intersects(this.extent_, geometry.getExtent())) {\n      return;\n    }\n    if (this.strokeState_ || this.fillState_) {\n      if (this.fillState_) {\n        this.setContextFillState_(this.fillState_);\n      }\n      if (this.strokeState_) {\n        this.setContextStrokeState_(this.strokeState_);\n      }\n      const context = this.context_;\n      const flatCoordinates = geometry.getOrientedFlatCoordinates();\n      let offset = 0;\n      const endss = geometry.getEndss();\n      const stride = geometry.getStride();\n      context.beginPath();\n      for (let i = 0, ii = endss.length; i < ii; ++i) {\n        const ends = endss[i];\n        offset = this.drawRings_(flatCoordinates, offset, ends, stride);\n      }\n      if (this.fillState_) {\n        context.fill();\n      }\n      if (this.strokeState_) {\n        context.stroke();\n      }\n    }\n    if (this.text_ !== '') {\n      const flatInteriorPoints = geometry.getFlatInteriorPoints();\n      this.drawText_(flatInteriorPoints, 0, flatInteriorPoints.length, 2);\n    }\n  }\n\n  /**\n   * @param {import(\"../canvas.js\").FillState} fillState Fill state.\n   * @private\n   */\n  setContextFillState_(fillState) {\n    const context = this.context_;\n    const contextFillState = this.contextFillState_;\n    if (!contextFillState) {\n      context.fillStyle = fillState.fillStyle;\n      this.contextFillState_ = {\n        fillStyle: fillState.fillStyle\n      };\n    } else {\n      if (contextFillState.fillStyle != fillState.fillStyle) {\n        contextFillState.fillStyle = context.fillStyle = fillState.fillStyle;\n      }\n    }\n  }\n\n  /**\n   * @param {import(\"../canvas.js\").StrokeState} strokeState Stroke state.\n   * @private\n   */\n  setContextStrokeState_(strokeState) {\n    const context = this.context_;\n    const contextStrokeState = this.contextStrokeState_;\n    if (!contextStrokeState) {\n      context.lineCap = /** @type {CanvasLineCap} */ (strokeState.lineCap);\n      if (CANVAS_LINE_DASH) {\n        context.setLineDash(strokeState.lineDash);\n        context.lineDashOffset = strokeState.lineDashOffset;\n      }\n      context.lineJoin = /** @type {CanvasLineJoin} */ (strokeState.lineJoin);\n      context.lineWidth = strokeState.lineWidth;\n      context.miterLimit = strokeState.miterLimit;\n      context.strokeStyle = strokeState.strokeStyle;\n      this.contextStrokeState_ = {\n        lineCap: strokeState.lineCap,\n        lineDash: strokeState.lineDash,\n        lineDashOffset: strokeState.lineDashOffset,\n        lineJoin: strokeState.lineJoin,\n        lineWidth: strokeState.lineWidth,\n        miterLimit: strokeState.miterLimit,\n        strokeStyle: strokeState.strokeStyle\n      };\n    } else {\n      if (contextStrokeState.lineCap != strokeState.lineCap) {\n        contextStrokeState.lineCap = context.lineCap = /** @type {CanvasLineCap} */ (strokeState.lineCap);\n      }\n      if (CANVAS_LINE_DASH) {\n        if (!equals(contextStrokeState.lineDash, strokeState.lineDash)) {\n          context.setLineDash(contextStrokeState.lineDash = strokeState.lineDash);\n        }\n        if (contextStrokeState.lineDashOffset != strokeState.lineDashOffset) {\n          contextStrokeState.lineDashOffset = context.lineDashOffset =\n              strokeState.lineDashOffset;\n        }\n      }\n      if (contextStrokeState.lineJoin != strokeState.lineJoin) {\n        contextStrokeState.lineJoin = context.lineJoin = /** @type {CanvasLineJoin} */ (strokeState.lineJoin);\n      }\n      if (contextStrokeState.lineWidth != strokeState.lineWidth) {\n        contextStrokeState.lineWidth = context.lineWidth = strokeState.lineWidth;\n      }\n      if (contextStrokeState.miterLimit != strokeState.miterLimit) {\n        contextStrokeState.miterLimit = context.miterLimit =\n            strokeState.miterLimit;\n      }\n      if (contextStrokeState.strokeStyle != strokeState.strokeStyle) {\n        contextStrokeState.strokeStyle = context.strokeStyle =\n            strokeState.strokeStyle;\n      }\n    }\n  }\n\n  /**\n   * @param {import(\"../canvas.js\").TextState} textState Text state.\n   * @private\n   */\n  setContextTextState_(textState) {\n    const context = this.context_;\n    const contextTextState = this.contextTextState_;\n    const textAlign = textState.textAlign ?\n      textState.textAlign : defaultTextAlign;\n    if (!contextTextState) {\n      context.font = textState.font;\n      context.textAlign = /** @type {CanvasTextAlign} */ (textAlign);\n      context.textBaseline = /** @type {CanvasTextBaseline} */ (textState.textBaseline);\n      this.contextTextState_ = {\n        font: textState.font,\n        textAlign: textAlign,\n        textBaseline: textState.textBaseline\n      };\n    } else {\n      if (contextTextState.font != textState.font) {\n        contextTextState.font = context.font = textState.font;\n      }\n      if (contextTextState.textAlign != textAlign) {\n        contextTextState.textAlign = context.textAlign = /** @type {CanvasTextAlign} */ (textAlign);\n      }\n      if (contextTextState.textBaseline != textState.textBaseline) {\n        contextTextState.textBaseline = context.textBaseline =\n          /** @type {CanvasTextBaseline} */ (textState.textBaseline);\n      }\n    }\n  }\n\n  /**\n   * Set the fill and stroke style for subsequent draw operations.  To clear\n   * either fill or stroke styles, pass null for the appropriate parameter.\n   *\n   * @param {import(\"../../style/Fill.js\").default} fillStyle Fill style.\n   * @param {import(\"../../style/Stroke.js\").default} strokeStyle Stroke style.\n   * @override\n   */\n  setFillStrokeStyle(fillStyle, strokeStyle) {\n    if (!fillStyle) {\n      this.fillState_ = null;\n    } else {\n      const fillStyleColor = fillStyle.getColor();\n      this.fillState_ = {\n        fillStyle: asColorLike(fillStyleColor ?\n          fillStyleColor : defaultFillStyle)\n      };\n    }\n    if (!strokeStyle) {\n      this.strokeState_ = null;\n    } else {\n      const strokeStyleColor = strokeStyle.getColor();\n      const strokeStyleLineCap = strokeStyle.getLineCap();\n      const strokeStyleLineDash = strokeStyle.getLineDash();\n      const strokeStyleLineDashOffset = strokeStyle.getLineDashOffset();\n      const strokeStyleLineJoin = strokeStyle.getLineJoin();\n      const strokeStyleWidth = strokeStyle.getWidth();\n      const strokeStyleMiterLimit = strokeStyle.getMiterLimit();\n      this.strokeState_ = {\n        lineCap: strokeStyleLineCap !== undefined ?\n          strokeStyleLineCap : defaultLineCap,\n        lineDash: strokeStyleLineDash ?\n          strokeStyleLineDash : defaultLineDash,\n        lineDashOffset: strokeStyleLineDashOffset ?\n          strokeStyleLineDashOffset : defaultLineDashOffset,\n        lineJoin: strokeStyleLineJoin !== undefined ?\n          strokeStyleLineJoin : defaultLineJoin,\n        lineWidth: this.pixelRatio_ * (strokeStyleWidth !== undefined ?\n          strokeStyleWidth : defaultLineWidth),\n        miterLimit: strokeStyleMiterLimit !== undefined ?\n          strokeStyleMiterLimit : defaultMiterLimit,\n        strokeStyle: asColorLike(strokeStyleColor ?\n          strokeStyleColor : defaultStrokeStyle)\n      };\n    }\n  }\n\n  /**\n   * Set the image style for subsequent draw operations.  Pass null to remove\n   * the image style.\n   *\n   * @param {import(\"../../style/Image.js\").default} imageStyle Image style.\n   * @override\n   */\n  setImageStyle(imageStyle) {\n    if (!imageStyle) {\n      this.image_ = null;\n    } else {\n      const imageAnchor = imageStyle.getAnchor();\n      // FIXME pixel ratio\n      const imageImage = imageStyle.getImage(1);\n      const imageOrigin = imageStyle.getOrigin();\n      const imageSize = imageStyle.getSize();\n      this.imageAnchorX_ = imageAnchor[0];\n      this.imageAnchorY_ = imageAnchor[1];\n      this.imageHeight_ = imageSize[1];\n      this.image_ = imageImage;\n      this.imageOpacity_ = imageStyle.getOpacity();\n      this.imageOriginX_ = imageOrigin[0];\n      this.imageOriginY_ = imageOrigin[1];\n      this.imageRotateWithView_ = imageStyle.getRotateWithView();\n      this.imageRotation_ = imageStyle.getRotation();\n      this.imageScale_ = imageStyle.getScale() * this.pixelRatio_;\n      this.imageWidth_ = imageSize[0];\n    }\n  }\n\n  /**\n   * Set the text style for subsequent draw operations.  Pass null to\n   * remove the text style.\n   *\n   * @param {import(\"../../style/Text.js\").default} textStyle Text style.\n   * @override\n   */\n  setTextStyle(textStyle) {\n    if (!textStyle) {\n      this.text_ = '';\n    } else {\n      const textFillStyle = textStyle.getFill();\n      if (!textFillStyle) {\n        this.textFillState_ = null;\n      } else {\n        const textFillStyleColor = textFillStyle.getColor();\n        this.textFillState_ = {\n          fillStyle: asColorLike(textFillStyleColor ?\n            textFillStyleColor : defaultFillStyle)\n        };\n      }\n      const textStrokeStyle = textStyle.getStroke();\n      if (!textStrokeStyle) {\n        this.textStrokeState_ = null;\n      } else {\n        const textStrokeStyleColor = textStrokeStyle.getColor();\n        const textStrokeStyleLineCap = textStrokeStyle.getLineCap();\n        const textStrokeStyleLineDash = textStrokeStyle.getLineDash();\n        const textStrokeStyleLineDashOffset = textStrokeStyle.getLineDashOffset();\n        const textStrokeStyleLineJoin = textStrokeStyle.getLineJoin();\n        const textStrokeStyleWidth = textStrokeStyle.getWidth();\n        const textStrokeStyleMiterLimit = textStrokeStyle.getMiterLimit();\n        this.textStrokeState_ = {\n          lineCap: textStrokeStyleLineCap !== undefined ?\n            textStrokeStyleLineCap : defaultLineCap,\n          lineDash: textStrokeStyleLineDash ?\n            textStrokeStyleLineDash : defaultLineDash,\n          lineDashOffset: textStrokeStyleLineDashOffset ?\n            textStrokeStyleLineDashOffset : defaultLineDashOffset,\n          lineJoin: textStrokeStyleLineJoin !== undefined ?\n            textStrokeStyleLineJoin : defaultLineJoin,\n          lineWidth: textStrokeStyleWidth !== undefined ?\n            textStrokeStyleWidth : defaultLineWidth,\n          miterLimit: textStrokeStyleMiterLimit !== undefined ?\n            textStrokeStyleMiterLimit : defaultMiterLimit,\n          strokeStyle: asColorLike(textStrokeStyleColor ?\n            textStrokeStyleColor : defaultStrokeStyle)\n        };\n      }\n      const textFont = textStyle.getFont();\n      const textOffsetX = textStyle.getOffsetX();\n      const textOffsetY = textStyle.getOffsetY();\n      const textRotateWithView = textStyle.getRotateWithView();\n      const textRotation = textStyle.getRotation();\n      const textScale = textStyle.getScale();\n      const textText = textStyle.getText();\n      const textTextAlign = textStyle.getTextAlign();\n      const textTextBaseline = textStyle.getTextBaseline();\n      this.textState_ = {\n        font: textFont !== undefined ?\n          textFont : defaultFont,\n        textAlign: textTextAlign !== undefined ?\n          textTextAlign : defaultTextAlign,\n        textBaseline: textTextBaseline !== undefined ?\n          textTextBaseline : defaultTextBaseline\n      };\n      this.text_ = textText !== undefined ? textText : '';\n      this.textOffsetX_ =\n          textOffsetX !== undefined ? (this.pixelRatio_ * textOffsetX) : 0;\n      this.textOffsetY_ =\n          textOffsetY !== undefined ? (this.pixelRatio_ * textOffsetY) : 0;\n      this.textRotateWithView_ = textRotateWithView !== undefined ? textRotateWithView : false;\n      this.textRotation_ = textRotation !== undefined ? textRotation : 0;\n      this.textScale_ = this.pixelRatio_ * (textScale !== undefined ?\n        textScale : 1);\n    }\n  }\n}\n\n\nexport default CanvasImmediateRenderer;\n","/**\n * @module ol/style/IconImageCache\n */\nimport {asString} from '../color.js';\n\n/**\n * @classdesc\n * Singleton class. Available through {@link module:ol/style/IconImageCache~shared}.\n */\nclass IconImageCache {\n  constructor() {\n\n    /**\n    * @type {!Object<string, import(\"./IconImage.js\").default>}\n    * @private\n    */\n    this.cache_ = {};\n\n    /**\n    * @type {number}\n    * @private\n    */\n    this.cacheSize_ = 0;\n\n    /**\n    * @type {number}\n    * @private\n    */\n    this.maxCacheSize_ = 32;\n  }\n\n  /**\n  * FIXME empty description for jsdoc\n  */\n  clear() {\n    this.cache_ = {};\n    this.cacheSize_ = 0;\n  }\n\n  /**\n  * FIXME empty description for jsdoc\n  */\n  expire() {\n    if (this.cacheSize_ > this.maxCacheSize_) {\n      let i = 0;\n      for (const key in this.cache_) {\n        const iconImage = this.cache_[key];\n        if ((i++ & 3) === 0 && !iconImage.hasListener()) {\n          delete this.cache_[key];\n          --this.cacheSize_;\n        }\n      }\n    }\n  }\n\n  /**\n  * @param {string} src Src.\n  * @param {?string} crossOrigin Cross origin.\n  * @param {import(\"../color.js\").Color} color Color.\n  * @return {import(\"./IconImage.js\").default} Icon image.\n  */\n  get(src, crossOrigin, color) {\n    const key = getKey(src, crossOrigin, color);\n    return key in this.cache_ ? this.cache_[key] : null;\n  }\n\n  /**\n  * @param {string} src Src.\n  * @param {?string} crossOrigin Cross origin.\n  * @param {import(\"../color.js\").Color} color Color.\n  * @param {import(\"./IconImage.js\").default} iconImage Icon image.\n  */\n  set(src, crossOrigin, color, iconImage) {\n    const key = getKey(src, crossOrigin, color);\n    this.cache_[key] = iconImage;\n    ++this.cacheSize_;\n  }\n\n  /**\n  * Set the cache size of the icon cache. Default is `32`. Change this value when\n  * your map uses more than 32 different icon images and you are not caching icon\n  * styles on the application level.\n  * @param {number} maxCacheSize Cache max size.\n  * @api\n  */\n  setSize(maxCacheSize) {\n    this.maxCacheSize_ = maxCacheSize;\n    this.expire();\n  }\n}\n\n\n/**\n * @param {string} src Src.\n * @param {?string} crossOrigin Cross origin.\n * @param {import(\"../color.js\").Color} color Color.\n * @return {string} Cache key.\n */\nfunction getKey(src, crossOrigin, color) {\n  const colorString = color ? asString(color) : 'null';\n  return crossOrigin + ':' + src + ':' + colorString;\n}\n\n\nexport default IconImageCache;\n\n\n/**\n * The {@link module:ol/style/IconImageCache~IconImageCache} for\n * {@link module:ol/style/Icon~Icon} images.\n * @api\n */\nexport const shared = new IconImageCache();\n","/**\n * @module ol/renderer/Map\n */\nimport {abstract, getUid} from '../util.js';\nimport Disposable from '../Disposable.js';\nimport {listen, unlistenByKey} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {getWidth} from '../extent.js';\nimport {TRUE} from '../functions.js';\nimport {visibleAtResolution} from '../layer/Layer.js';\nimport {shared as iconImageCache} from '../style/IconImageCache.js';\nimport {compose as composeTransform, invert as invertTransform, setFromArray as transformSetFromArray} from '../transform.js';\n\n/**\n * @abstract\n */\nclass MapRenderer extends Disposable {\n\n  /**\n   * @param {import(\"../PluggableMap.js\").default} map Map.\n   */\n  constructor(map) {\n    super();\n\n    /**\n     * @private\n     * @type {import(\"../PluggableMap.js\").default}\n     */\n    this.map_ = map;\n\n    /**\n     * @private\n     * @type {!Object<string, import(\"./Layer.js\").default>}\n     */\n    this.layerRenderers_ = {};\n\n    /**\n     * @private\n     * @type {Object<string, import(\"../events.js\").EventsKey>}\n     */\n    this.layerRendererListeners_ = {};\n\n    /**\n     * @private\n     * @type {Array<typeof import(\"./Layer.js\").default>}\n     */\n    this.layerRendererConstructors_ = [];\n\n  }\n\n  /**\n   * @abstract\n   * @param {import(\"../render/EventType.js\").default} type Event type.\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   */\n  dispatchRenderEvent(type, frameState) {\n    abstract();\n  }\n\n  /**\n   * Register layer renderer constructors.\n   * @param {Array<typeof import(\"./Layer.js\").default>} constructors Layer renderers.\n   */\n  registerLayerRenderers(constructors) {\n    this.layerRendererConstructors_.push.apply(this.layerRendererConstructors_, constructors);\n  }\n\n  /**\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState FrameState.\n   * @protected\n   */\n  calculateMatrices2D(frameState) {\n    const viewState = frameState.viewState;\n    const coordinateToPixelTransform = frameState.coordinateToPixelTransform;\n    const pixelToCoordinateTransform = frameState.pixelToCoordinateTransform;\n\n    composeTransform(coordinateToPixelTransform,\n      frameState.size[0] / 2, frameState.size[1] / 2,\n      1 / viewState.resolution, -1 / viewState.resolution,\n      -viewState.rotation,\n      -viewState.center[0], -viewState.center[1]);\n\n    invertTransform(\n      transformSetFromArray(pixelToCoordinateTransform, coordinateToPixelTransform));\n  }\n\n  /**\n   * Removes all layer renderers.\n   */\n  removeLayerRenderers() {\n    for (const key in this.layerRenderers_) {\n      this.removeLayerRendererByKey_(key).dispose();\n    }\n  }\n\n  /**\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState FrameState.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {function(this: S, import(\"../Feature.js\").FeatureLike,\n   *     import(\"../layer/Layer.js\").default): T} callback Feature callback.\n   * @param {S} thisArg Value to use as `this` when executing `callback`.\n   * @param {function(this: U, import(\"../layer/Layer.js\").default): boolean} layerFilter Layer filter\n   *     function, only layers which are visible and for which this function\n   *     returns `true` will be tested for features.  By default, all visible\n   *     layers will be tested.\n   * @param {U} thisArg2 Value to use as `this` when executing `layerFilter`.\n   * @return {T|undefined} Callback result.\n   * @template S,T,U\n   */\n  forEachFeatureAtCoordinate(\n    coordinate,\n    frameState,\n    hitTolerance,\n    callback,\n    thisArg,\n    layerFilter,\n    thisArg2\n  ) {\n    let result;\n    const viewState = frameState.viewState;\n    const viewResolution = viewState.resolution;\n\n    /**\n     * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n     * @param {import(\"../layer/Layer.js\").default} layer Layer.\n     * @return {?} Callback result.\n     */\n    function forEachFeatureAtCoordinate(feature, layer) {\n      const managed = frameState.layerStates[getUid(layer)].managed;\n      if (!(getUid(feature) in frameState.skippedFeatureUids && !managed)) {\n        return callback.call(thisArg, feature, managed ? layer : null);\n      }\n    }\n\n    const projection = viewState.projection;\n\n    let translatedCoordinate = coordinate;\n    if (projection.canWrapX()) {\n      const projectionExtent = projection.getExtent();\n      const worldWidth = getWidth(projectionExtent);\n      const x = coordinate[0];\n      if (x < projectionExtent[0] || x > projectionExtent[2]) {\n        const worldsAway = Math.ceil((projectionExtent[0] - x) / worldWidth);\n        translatedCoordinate = [x + worldWidth * worldsAway, coordinate[1]];\n      }\n    }\n\n    const layerStates = frameState.layerStatesArray;\n    const numLayers = layerStates.length;\n    let i;\n    for (i = numLayers - 1; i >= 0; --i) {\n      const layerState = layerStates[i];\n      const layer = layerState.layer;\n      if (visibleAtResolution(layerState, viewResolution) && layerFilter.call(thisArg2, layer)) {\n        const layerRenderer = this.getLayerRenderer(layer);\n        const source = /** @type {import(\"../layer/Layer.js\").default} */ (layer).getSource();\n        if (source) {\n          result = layerRenderer.forEachFeatureAtCoordinate(\n            source.getWrapX() ? translatedCoordinate : coordinate,\n            frameState, hitTolerance, forEachFeatureAtCoordinate);\n        }\n        if (result) {\n          return result;\n        }\n      }\n    }\n    return undefined;\n  }\n\n  /**\n   * @abstract\n   * @param {import(\"../pixel.js\").Pixel} pixel Pixel.\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState FrameState.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {function(this: S, import(\"../layer/Layer.js\").default, (Uint8ClampedArray|Uint8Array)): T} callback Layer\n   *     callback.\n   * @param {S} thisArg Value to use as `this` when executing `callback`.\n   * @param {function(this: U, import(\"../layer/Layer.js\").default): boolean} layerFilter Layer filter\n   *     function, only layers which are visible and for which this function\n   *     returns `true` will be tested for features.  By default, all visible\n   *     layers will be tested.\n   * @param {U} thisArg2 Value to use as `this` when executing `layerFilter`.\n   * @return {T|undefined} Callback result.\n   * @template S,T,U\n   */\n  forEachLayerAtPixel(pixel, frameState, hitTolerance, callback, thisArg, layerFilter, thisArg2) {\n    return abstract();\n  }\n\n  /**\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState FrameState.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {function(this: U, import(\"../layer/Layer.js\").default): boolean} layerFilter Layer filter\n   *     function, only layers which are visible and for which this function\n   *     returns `true` will be tested for features.  By default, all visible\n   *     layers will be tested.\n   * @param {U} thisArg Value to use as `this` when executing `layerFilter`.\n   * @return {boolean} Is there a feature at the given coordinate?\n   * @template U\n   */\n  hasFeatureAtCoordinate(coordinate, frameState, hitTolerance, layerFilter, thisArg) {\n    const hasFeature = this.forEachFeatureAtCoordinate(\n      coordinate, frameState, hitTolerance, TRUE, this, layerFilter, thisArg);\n\n    return hasFeature !== undefined;\n  }\n\n  /**\n   * @param {import(\"../layer/Base.js\").default} layer Layer.\n   * @protected\n   * @return {import(\"./Layer.js\").default} Layer renderer.\n   */\n  getLayerRenderer(layer) {\n    const layerKey = getUid(layer);\n    if (layerKey in this.layerRenderers_) {\n      return this.layerRenderers_[layerKey];\n    } else {\n      let renderer;\n      for (let i = 0, ii = this.layerRendererConstructors_.length; i < ii; ++i) {\n        const candidate = this.layerRendererConstructors_[i];\n        if (candidate['handles'](layer)) {\n          renderer = candidate['create'](this, layer);\n          break;\n        }\n      }\n      if (renderer) {\n        this.layerRenderers_[layerKey] = renderer;\n        this.layerRendererListeners_[layerKey] = listen(renderer,\n          EventType.CHANGE, this.handleLayerRendererChange_, this);\n      } else {\n        throw new Error('Unable to create renderer for layer: ' + layer.getType());\n      }\n      return renderer;\n    }\n  }\n\n  /**\n   * @param {string} layerKey Layer key.\n   * @protected\n   * @return {import(\"./Layer.js\").default} Layer renderer.\n   */\n  getLayerRendererByKey(layerKey) {\n    return this.layerRenderers_[layerKey];\n  }\n\n  /**\n   * @protected\n   * @return {Object<string, import(\"./Layer.js\").default>} Layer renderers.\n   */\n  getLayerRenderers() {\n    return this.layerRenderers_;\n  }\n\n  /**\n   * @return {import(\"../PluggableMap.js\").default} Map.\n   */\n  getMap() {\n    return this.map_;\n  }\n\n  /**\n   * Handle changes in a layer renderer.\n   * @private\n   */\n  handleLayerRendererChange_() {\n    this.map_.render();\n  }\n\n  /**\n   * @param {string} layerKey Layer key.\n   * @return {import(\"./Layer.js\").default} Layer renderer.\n   * @private\n   */\n  removeLayerRendererByKey_(layerKey) {\n    const layerRenderer = this.layerRenderers_[layerKey];\n    delete this.layerRenderers_[layerKey];\n\n    unlistenByKey(this.layerRendererListeners_[layerKey]);\n    delete this.layerRendererListeners_[layerKey];\n\n    return layerRenderer;\n  }\n\n  /**\n   * @param {import(\"../PluggableMap.js\").default} map Map.\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   * @private\n   */\n  removeUnusedLayerRenderers_(map, frameState) {\n    for (const layerKey in this.layerRenderers_) {\n      if (!frameState || !(layerKey in frameState.layerStates)) {\n        this.removeLayerRendererByKey_(layerKey).dispose();\n      }\n    }\n  }\n\n  /**\n   * Render.\n   * @abstract\n   * @param {?import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   */\n  renderFrame(frameState) {\n    abstract();\n  }\n\n  /**\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   * @protected\n   */\n  scheduleExpireIconCache(frameState) {\n    frameState.postRenderFunctions.push(/** @type {import(\"../PluggableMap.js\").PostRenderFunction} */ (expireIconCache));\n  }\n\n  /**\n   * @param {!import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   * @protected\n   */\n  scheduleRemoveUnusedLayerRenderers(frameState) {\n    for (const layerKey in this.layerRenderers_) {\n      if (!(layerKey in frameState.layerStates)) {\n        frameState.postRenderFunctions.push(\n          /** @type {import(\"../PluggableMap.js\").PostRenderFunction} */ (this.removeUnusedLayerRenderers_.bind(this))\n        );\n        return;\n      }\n    }\n  }\n}\n\n\n/**\n * @param {import(\"../PluggableMap.js\").default} map Map.\n * @param {import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n */\nfunction expireIconCache(map, frameState) {\n  iconImageCache.expire();\n}\n\n\n/**\n * @param {import(\"../layer/Layer.js\").State} state1 First layer state.\n * @param {import(\"../layer/Layer.js\").State} state2 Second layer state.\n * @return {number} The zIndex difference.\n */\nexport function sortByZIndex(state1, state2) {\n  return state1.zIndex - state2.zIndex;\n}\nexport default MapRenderer;\n","/**\n * @module ol/renderer/canvas/Map\n */\nimport {create as createTransform, apply as applyTransform, compose as composeTransform} from '../../transform.js';\nimport {includes, stableSort} from '../../array.js';\nimport {CLASS_UNSELECTABLE} from '../../css.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {visibleAtResolution} from '../../layer/Layer.js';\nimport RenderEvent from '../../render/Event.js';\nimport RenderEventType from '../../render/EventType.js';\nimport {rotateAtOffset} from '../../render/canvas.js';\nimport CanvasImmediateRenderer from '../../render/canvas/Immediate.js';\nimport MapRenderer, {sortByZIndex} from '../Map.js';\nimport SourceState from '../../source/State.js';\n\n\n/**\n * @type {Array<typeof import(\"../Layer.js\").default>}\n */\nexport const layerRendererConstructors = [];\n\n/**\n * @classdesc\n * Canvas map renderer.\n * @api\n */\nclass CanvasMapRenderer extends MapRenderer {\n\n  /**\n   * @param {import(\"../../PluggableMap.js\").default} map Map.\n   */\n  constructor(map) {\n    super(map);\n\n    const container = map.getViewport();\n\n    /**\n     * @private\n     * @type {CanvasRenderingContext2D}\n     */\n    this.context_ = createCanvasContext2D();\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.canvas_ = this.context_.canvas;\n\n    this.canvas_.style.width = '100%';\n    this.canvas_.style.height = '100%';\n    this.canvas_.style.display = 'block';\n    this.canvas_.className = CLASS_UNSELECTABLE;\n    container.insertBefore(this.canvas_, container.childNodes[0] || null);\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.renderedVisible_ = true;\n\n    /**\n     * @private\n     * @type {import(\"../../transform.js\").Transform}\n     */\n    this.transform_ = createTransform();\n\n  }\n\n  /**\n   * @param {import(\"../../render/EventType.js\").default} type Event type.\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   */\n  dispatchRenderEvent(type, frameState) {\n    const map = this.getMap();\n    const context = this.context_;\n    if (map.hasListener(type)) {\n      const extent = frameState.extent;\n      const pixelRatio = frameState.pixelRatio;\n      const viewState = frameState.viewState;\n      const rotation = viewState.rotation;\n\n      const transform = this.getTransform(frameState);\n\n      const vectorContext = new CanvasImmediateRenderer(context, pixelRatio,\n        extent, transform, rotation);\n      const composeEvent = new RenderEvent(type, vectorContext,\n        frameState, context, null);\n      map.dispatchEvent(composeEvent);\n    }\n  }\n\n  /**\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @protected\n   * @return {!import(\"../../transform.js\").Transform} Transform.\n   */\n  getTransform(frameState) {\n    const viewState = frameState.viewState;\n    const dx1 = this.canvas_.width / 2;\n    const dy1 = this.canvas_.height / 2;\n    const sx = frameState.pixelRatio / viewState.resolution;\n    const sy = -sx;\n    const angle = -viewState.rotation;\n    const dx2 = -viewState.center[0];\n    const dy2 = -viewState.center[1];\n    return composeTransform(this.transform_, dx1, dy1, sx, sy, angle, dx2, dy2);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  renderFrame(frameState) {\n\n    if (!frameState) {\n      if (this.renderedVisible_) {\n        this.canvas_.style.display = 'none';\n        this.renderedVisible_ = false;\n      }\n      return;\n    }\n\n    const context = this.context_;\n    const pixelRatio = frameState.pixelRatio;\n    const width = Math.round(frameState.size[0] * pixelRatio);\n    const height = Math.round(frameState.size[1] * pixelRatio);\n    if (this.canvas_.width != width || this.canvas_.height != height) {\n      this.canvas_.width = width;\n      this.canvas_.height = height;\n    } else {\n      context.clearRect(0, 0, width, height);\n    }\n\n    const rotation = frameState.viewState.rotation;\n\n    this.calculateMatrices2D(frameState);\n\n    this.dispatchRenderEvent(RenderEventType.PRECOMPOSE, frameState);\n\n    const layerStatesArray = frameState.layerStatesArray;\n    stableSort(layerStatesArray, sortByZIndex);\n\n    if (rotation) {\n      context.save();\n      rotateAtOffset(context, rotation, width / 2, height / 2);\n    }\n\n    const viewResolution = frameState.viewState.resolution;\n    let i, ii;\n    for (i = 0, ii = layerStatesArray.length; i < ii; ++i) {\n      const layerState = layerStatesArray[i];\n      const layer = layerState.layer;\n      const layerRenderer = /** @type {import(\"./Layer.js\").default} */ (this.getLayerRenderer(layer));\n      if (!visibleAtResolution(layerState, viewResolution) ||\n          layerState.sourceState != SourceState.READY) {\n        continue;\n      }\n      if (layerRenderer.prepareFrame(frameState, layerState)) {\n        layerRenderer.composeFrame(frameState, layerState, context);\n      }\n    }\n\n    if (rotation) {\n      context.restore();\n    }\n\n    this.dispatchRenderEvent(RenderEventType.POSTCOMPOSE, frameState);\n\n    if (!this.renderedVisible_) {\n      this.canvas_.style.display = '';\n      this.renderedVisible_ = true;\n    }\n\n    this.scheduleRemoveUnusedLayerRenderers(frameState);\n    this.scheduleExpireIconCache(frameState);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  forEachLayerAtPixel(pixel, frameState, hitTolerance, callback, thisArg, layerFilter, thisArg2) {\n    let result;\n    const viewState = frameState.viewState;\n    const viewResolution = viewState.resolution;\n\n    const layerStates = frameState.layerStatesArray;\n    const numLayers = layerStates.length;\n\n    const coordinate = applyTransform(\n      frameState.pixelToCoordinateTransform, pixel.slice());\n\n    let i;\n    for (i = numLayers - 1; i >= 0; --i) {\n      const layerState = layerStates[i];\n      const layer = layerState.layer;\n      if (visibleAtResolution(layerState, viewResolution) && layerFilter.call(thisArg2, layer)) {\n        const layerRenderer = /** @type {import(\"./Layer.js\").default} */ (this.getLayerRenderer(layer));\n        result = layerRenderer.forEachLayerAtCoordinate(\n          coordinate, frameState, hitTolerance, callback, thisArg);\n        if (result) {\n          return result;\n        }\n      }\n    }\n    return undefined;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  registerLayerRenderers(constructors) {\n    super.registerLayerRenderers(constructors);\n    for (let i = 0, ii = constructors.length; i < ii; ++i) {\n      const ctor = constructors[i];\n      if (!includes(layerRendererConstructors, ctor)) {\n        layerRendererConstructors.push(ctor);\n      }\n    }\n  }\n}\n\n\nexport default CanvasMapRenderer;\n","/**\n * @module ol/renderer/Layer\n */\nimport {getUid} from '../util.js';\nimport ImageState from '../ImageState.js';\nimport Observable from '../Observable.js';\nimport TileState from '../TileState.js';\nimport {listen} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport SourceState from '../source/State.js';\n\nclass LayerRenderer extends Observable {\n\n  /**\n   * @param {import(\"../layer/Layer.js\").default} layer Layer.\n   */\n  constructor(layer) {\n\n    super();\n\n    /**\n     * @private\n     * @type {import(\"../layer/Layer.js\").default}\n     */\n    this.layer_ = layer;\n\n  }\n\n  /**\n   * Create a function that adds loaded tiles to the tile lookup.\n   * @param {import(\"../source/Tile.js\").default} source Tile source.\n   * @param {import(\"../proj/Projection.js\").default} projection Projection of the tiles.\n   * @param {Object<number, Object<string, import(\"../Tile.js\").default>>} tiles Lookup of loaded tiles by zoom level.\n   * @return {function(number, import(\"../TileRange.js\").default):boolean} A function that can be\n   *     called with a zoom level and a tile range to add loaded tiles to the lookup.\n   * @protected\n   */\n  createLoadedTileFinder(source, projection, tiles) {\n    return (\n      /**\n       * @param {number} zoom Zoom level.\n       * @param {import(\"../TileRange.js\").default} tileRange Tile range.\n       * @return {boolean} The tile range is fully loaded.\n       */\n      function(zoom, tileRange) {\n        /**\n         * @param {import(\"../Tile.js\").default} tile Tile.\n         */\n        function callback(tile) {\n          if (!tiles[zoom]) {\n            tiles[zoom] = {};\n          }\n          tiles[zoom][tile.tileCoord.toString()] = tile;\n        }\n        return source.forEachLoadedTile(projection, zoom, tileRange, callback);\n      }\n    );\n  }\n\n  /**\n   * @abstract\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {function(import(\"../Feature.js\").FeatureLike, import(\"../layer/Layer.js\").default): T} callback Feature callback.\n   * @return {T|void} Callback result.\n   * @template T\n   */\n  forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback) {}\n\n  /**\n   * @return {import(\"../layer/Layer.js\").default} Layer.\n   */\n  getLayer() {\n    return this.layer_;\n  }\n\n  /**\n   * Handle changes in image state.\n   * @param {import(\"../events/Event.js\").default} event Image change event.\n   * @private\n   */\n  handleImageChange_(event) {\n    const image = /** @type {import(\"../Image.js\").default} */ (event.target);\n    if (image.getState() === ImageState.LOADED) {\n      this.renderIfReadyAndVisible();\n    }\n  }\n\n  /**\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   * @return {boolean} Is there a feature at the given coordinate?\n   */\n  hasFeatureAtCoordinate(coordinate, frameState) {\n    return false;\n  }\n\n  /**\n   * Load the image if not already loaded, and register the image change\n   * listener if needed.\n   * @param {import(\"../ImageBase.js\").default} image Image.\n   * @return {boolean} `true` if the image is already loaded, `false` otherwise.\n   * @protected\n   */\n  loadImage(image) {\n    let imageState = image.getState();\n    if (imageState != ImageState.LOADED && imageState != ImageState.ERROR) {\n      listen(image, EventType.CHANGE, this.handleImageChange_, this);\n    }\n    if (imageState == ImageState.IDLE) {\n      image.load();\n      imageState = image.getState();\n    }\n    return imageState == ImageState.LOADED;\n  }\n\n  /**\n   * @protected\n   */\n  renderIfReadyAndVisible() {\n    const layer = this.getLayer();\n    if (layer.getVisible() && layer.getSourceState() == SourceState.READY) {\n      this.changed();\n    }\n  }\n\n  /**\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../source/Tile.js\").default} tileSource Tile source.\n   * @protected\n   */\n  scheduleExpireCache(frameState, tileSource) {\n    if (tileSource.canExpireCache()) {\n      /**\n       * @param {import(\"../source/Tile.js\").default} tileSource Tile source.\n       * @param {import(\"../PluggableMap.js\").default} map Map.\n       * @param {import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n       */\n      const postRenderFunction = function(tileSource, map, frameState) {\n        const tileSourceKey = getUid(tileSource);\n        if (tileSourceKey in frameState.usedTiles) {\n          tileSource.expireCache(frameState.viewState.projection,\n            frameState.usedTiles[tileSourceKey]);\n        }\n      }.bind(null, tileSource);\n\n      frameState.postRenderFunctions.push(\n        /** @type {import(\"../PluggableMap.js\").PostRenderFunction} */ (postRenderFunction)\n      );\n    }\n  }\n\n  /**\n   * @param {!Object<string, !Object<string, import(\"../TileRange.js\").default>>} usedTiles Used tiles.\n   * @param {import(\"../source/Tile.js\").default} tileSource Tile source.\n   * @param {number} z Z.\n   * @param {import(\"../TileRange.js\").default} tileRange Tile range.\n   * @protected\n   */\n  updateUsedTiles(usedTiles, tileSource, z, tileRange) {\n    // FIXME should we use tilesToDrawByZ instead?\n    const tileSourceKey = getUid(tileSource);\n    const zKey = z.toString();\n    if (tileSourceKey in usedTiles) {\n      if (zKey in usedTiles[tileSourceKey]) {\n        usedTiles[tileSourceKey][zKey].extend(tileRange);\n      } else {\n        usedTiles[tileSourceKey][zKey] = tileRange;\n      }\n    } else {\n      usedTiles[tileSourceKey] = {};\n      usedTiles[tileSourceKey][zKey] = tileRange;\n    }\n  }\n\n  /**\n   * Manage tile pyramid.\n   * This function performs a number of functions related to the tiles at the\n   * current zoom and lower zoom levels:\n   * - registers idle tiles in frameState.wantedTiles so that they are not\n   *   discarded by the tile queue\n   * - enqueues missing tiles\n   * @param {import(\"../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../source/Tile.js\").default} tileSource Tile source.\n   * @param {import(\"../tilegrid/TileGrid.js\").default} tileGrid Tile grid.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @param {number} currentZ Current Z.\n   * @param {number} preload Load low resolution tiles up to 'preload' levels.\n   * @param {function(this: T, import(\"../Tile.js\").default)=} opt_tileCallback Tile callback.\n   * @param {T=} opt_this Object to use as `this` in `opt_tileCallback`.\n   * @protected\n   * @template T\n   */\n  manageTilePyramid(\n    frameState,\n    tileSource,\n    tileGrid,\n    pixelRatio,\n    projection,\n    extent,\n    currentZ,\n    preload,\n    opt_tileCallback,\n    opt_this\n  ) {\n    const tileSourceKey = getUid(tileSource);\n    if (!(tileSourceKey in frameState.wantedTiles)) {\n      frameState.wantedTiles[tileSourceKey] = {};\n    }\n    const wantedTiles = frameState.wantedTiles[tileSourceKey];\n    const tileQueue = frameState.tileQueue;\n    const minZoom = tileGrid.getMinZoom();\n    let tile, tileRange, tileResolution, x, y, z;\n    for (z = minZoom; z <= currentZ; ++z) {\n      tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z, tileRange);\n      tileResolution = tileGrid.getResolution(z);\n      for (x = tileRange.minX; x <= tileRange.maxX; ++x) {\n        for (y = tileRange.minY; y <= tileRange.maxY; ++y) {\n          if (currentZ - z <= preload) {\n            tile = tileSource.getTile(z, x, y, pixelRatio, projection);\n            if (tile.getState() == TileState.IDLE) {\n              wantedTiles[tile.getKey()] = true;\n              if (!tileQueue.isKeyQueued(tile.getKey())) {\n                tileQueue.enqueue([tile, tileSourceKey,\n                  tileGrid.getTileCoordCenter(tile.tileCoord), tileResolution]);\n              }\n            }\n            if (opt_tileCallback !== undefined) {\n              opt_tileCallback.call(opt_this, tile);\n            }\n          } else {\n            tileSource.useTile(z, x, y, projection);\n          }\n        }\n      }\n    }\n  }\n}\n\nexport default LayerRenderer;\n","/**\n * @module ol/renderer/canvas/Layer\n */\nimport {abstract} from '../../util.js';\nimport {getBottomLeft, getBottomRight, getTopLeft, getTopRight} from '../../extent.js';\nimport {TRUE} from '../../functions.js';\nimport RenderEvent from '../../render/Event.js';\nimport RenderEventType from '../../render/EventType.js';\nimport {rotateAtOffset} from '../../render/canvas.js';\nimport CanvasImmediateRenderer from '../../render/canvas/Immediate.js';\nimport LayerRenderer from '../Layer.js';\nimport {create as createTransform, apply as applyTransform, compose as composeTransform} from '../../transform.js';\n\n/**\n * @abstract\n */\nclass CanvasLayerRenderer extends LayerRenderer {\n\n  /**\n   * @param {import(\"../../layer/Layer.js\").default} layer Layer.\n   */\n  constructor(layer) {\n\n    super(layer);\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.renderedResolution;\n\n    /**\n     * @private\n     * @type {import(\"../../transform.js\").Transform}\n     */\n    this.transform_ = createTransform();\n\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../../extent.js\").Extent} extent Clip extent.\n   * @protected\n   */\n  clip(context, frameState, extent) {\n    const pixelRatio = frameState.pixelRatio;\n    const width = frameState.size[0] * pixelRatio;\n    const height = frameState.size[1] * pixelRatio;\n    const rotation = frameState.viewState.rotation;\n    const topLeft = getTopLeft(extent);\n    const topRight = getTopRight(extent);\n    const bottomRight = getBottomRight(extent);\n    const bottomLeft = getBottomLeft(extent);\n\n    applyTransform(frameState.coordinateToPixelTransform, topLeft);\n    applyTransform(frameState.coordinateToPixelTransform, topRight);\n    applyTransform(frameState.coordinateToPixelTransform, bottomRight);\n    applyTransform(frameState.coordinateToPixelTransform, bottomLeft);\n\n    context.save();\n    rotateAtOffset(context, -rotation, width / 2, height / 2);\n    context.beginPath();\n    context.moveTo(topLeft[0] * pixelRatio, topLeft[1] * pixelRatio);\n    context.lineTo(topRight[0] * pixelRatio, topRight[1] * pixelRatio);\n    context.lineTo(bottomRight[0] * pixelRatio, bottomRight[1] * pixelRatio);\n    context.lineTo(bottomLeft[0] * pixelRatio, bottomLeft[1] * pixelRatio);\n    context.clip();\n    rotateAtOffset(context, rotation, width / 2, height / 2);\n  }\n\n  /**\n   * @param {import(\"../../render/EventType.js\").default} type Event type.\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../../transform.js\").Transform=} opt_transform Transform.\n   * @private\n   */\n  dispatchComposeEvent_(type, context, frameState, opt_transform) {\n    const layer = this.getLayer();\n    if (layer.hasListener(type)) {\n      const width = frameState.size[0] * frameState.pixelRatio;\n      const height = frameState.size[1] * frameState.pixelRatio;\n      const rotation = frameState.viewState.rotation;\n      rotateAtOffset(context, -rotation, width / 2, height / 2);\n      const transform = opt_transform !== undefined ?\n        opt_transform : this.getTransform(frameState, 0);\n      const render = new CanvasImmediateRenderer(\n        context, frameState.pixelRatio, frameState.extent, transform,\n        frameState.viewState.rotation);\n      const composeEvent = new RenderEvent(type, render, frameState,\n        context, null);\n      layer.dispatchEvent(composeEvent);\n      rotateAtOffset(context, rotation, width / 2, height / 2);\n    }\n  }\n\n  /**\n   * @param {import(\"../../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState FrameState.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {function(this: S, import(\"../../layer/Layer.js\").default, (Uint8ClampedArray|Uint8Array)): T} callback Layer\n   *     callback.\n   * @param {S} thisArg Value to use as `this` when executing `callback`.\n   * @return {T|undefined} Callback result.\n   * @template S,T,U\n   */\n  forEachLayerAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {\n    const hasFeature = this.forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, TRUE);\n\n    if (hasFeature) {\n      return callback.call(thisArg, this.getLayer(), null);\n    } else {\n      return undefined;\n    }\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../../layer/Layer.js\").State} layerState Layer state.\n   * @param {import(\"../../transform.js\").Transform=} opt_transform Transform.\n   * @protected\n   */\n  postCompose(context, frameState, layerState, opt_transform) {\n    this.dispatchComposeEvent_(RenderEventType.POSTCOMPOSE, context, frameState, opt_transform);\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../../transform.js\").Transform=} opt_transform Transform.\n   * @protected\n   */\n  preCompose(context, frameState, opt_transform) {\n    this.dispatchComposeEvent_(RenderEventType.PRECOMPOSE, context, frameState, opt_transform);\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../../transform.js\").Transform=} opt_transform Transform.\n   * @protected\n   */\n  dispatchRenderEvent(context, frameState, opt_transform) {\n    this.dispatchComposeEvent_(RenderEventType.RENDER, context, frameState, opt_transform);\n  }\n\n  /**\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {number} offsetX Offset on the x-axis in view coordinates.\n   * @protected\n   * @return {!import(\"../../transform.js\").Transform} Transform.\n   */\n  getTransform(frameState, offsetX) {\n    const viewState = frameState.viewState;\n    const pixelRatio = frameState.pixelRatio;\n    const dx1 = pixelRatio * frameState.size[0] / 2;\n    const dy1 = pixelRatio * frameState.size[1] / 2;\n    const sx = pixelRatio / viewState.resolution;\n    const sy = -sx;\n    const angle = -viewState.rotation;\n    const dx2 = -viewState.center[0] + offsetX;\n    const dy2 = -viewState.center[1];\n    return composeTransform(this.transform_, dx1, dy1, sx, sy, angle, dx2, dy2);\n  }\n\n  /**\n   * @abstract\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../../layer/Layer.js\").State} layerState Layer state.\n   * @param {CanvasRenderingContext2D} context Context.\n   */\n  composeFrame(frameState, layerState, context) {\n    abstract();\n  }\n\n  /**\n   * @abstract\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../../layer/Layer.js\").State} layerState Layer state.\n   * @return {boolean} whether composeFrame should be called.\n   */\n  prepareFrame(frameState, layerState) {\n    return abstract();\n  }\n}\n\nexport default CanvasLayerRenderer;\n","/**\n * @module ol/renderer/canvas/IntermediateCanvas\n */\nimport {abstract} from '../../util.js';\nimport {scale as scaleCoordinate} from '../../coordinate.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {containsExtent, intersects} from '../../extent.js';\nimport CanvasLayerRenderer from './Layer.js';\nimport {create as createTransform, apply as applyTransform} from '../../transform.js';\n\n/**\n * @abstract\n */\nclass IntermediateCanvasRenderer extends CanvasLayerRenderer {\n\n  /**\n   * @param {import(\"../../layer/Layer.js\").default} layer Layer.\n   */\n  constructor(layer) {\n\n    super(layer);\n\n    /**\n     * @protected\n     * @type {import(\"../../transform.js\").Transform}\n     */\n    this.coordinateToCanvasPixelTransform = createTransform();\n\n    /**\n     * @private\n     * @type {CanvasRenderingContext2D}\n     */\n    this.hitCanvasContext_ = null;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  composeFrame(frameState, layerState, context) {\n\n    this.preCompose(context, frameState);\n\n    const image = this.getImage();\n    if (image) {\n\n      // clipped rendering if layer extent is set\n      const extent = layerState.extent;\n      const clipped = extent !== undefined &&\n          !containsExtent(extent, frameState.extent) &&\n          intersects(extent, frameState.extent);\n      if (clipped) {\n        this.clip(context, frameState, /** @type {import(\"../../extent.js\").Extent} */ (extent));\n      }\n\n      const imageTransform = this.getImageTransform();\n      // for performance reasons, context.save / context.restore is not used\n      // to save and restore the transformation matrix and the opacity.\n      // see http://jsperf.com/context-save-restore-versus-variable\n      const alpha = context.globalAlpha;\n      context.globalAlpha = layerState.opacity;\n\n      // for performance reasons, context.setTransform is only used\n      // when the view is rotated. see http://jsperf.com/canvas-transform\n      const dx = imageTransform[4];\n      const dy = imageTransform[5];\n      const dw = image.width * imageTransform[0];\n      const dh = image.height * imageTransform[3];\n      if (dw >= 0.5 && dh >= 0.5) {\n        context.drawImage(image, 0, 0, +image.width, +image.height,\n          Math.round(dx), Math.round(dy), Math.round(dw), Math.round(dh));\n      }\n      context.globalAlpha = alpha;\n\n      if (clipped) {\n        context.restore();\n      }\n    }\n\n    this.postCompose(context, frameState, layerState);\n  }\n\n  /**\n   * @abstract\n   * @return {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} Canvas.\n   */\n  getImage() {\n    return abstract();\n  }\n\n  /**\n   * @abstract\n   * @return {!import(\"../../transform.js\").Transform} Image transform.\n   */\n  getImageTransform() {\n    return abstract();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  forEachLayerAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {\n    if (!this.getImage()) {\n      return undefined;\n    }\n\n    const pixel = applyTransform(this.coordinateToCanvasPixelTransform, coordinate.slice());\n    scaleCoordinate(pixel, frameState.viewState.resolution / this.renderedResolution);\n\n    if (!this.hitCanvasContext_) {\n      this.hitCanvasContext_ = createCanvasContext2D(1, 1);\n    }\n\n    this.hitCanvasContext_.clearRect(0, 0, 1, 1);\n    this.hitCanvasContext_.drawImage(this.getImage(), pixel[0], pixel[1], 1, 1, 0, 0, 1, 1);\n\n    const imageData = this.hitCanvasContext_.getImageData(0, 0, 1, 1).data;\n    if (imageData[3] > 0) {\n      return callback.call(thisArg, this.getLayer(), imageData);\n    } else {\n      return undefined;\n    }\n  }\n}\n\n\nexport default IntermediateCanvasRenderer;\n","/**\n * @module ol/renderer/canvas/ImageLayer\n */\nimport {ENABLE_RASTER_REPROJECTION} from '../../reproj/common.js';\nimport ImageCanvas from '../../ImageCanvas.js';\nimport LayerType from '../../LayerType.js';\nimport ViewHint from '../../ViewHint.js';\nimport {equals} from '../../array.js';\nimport {getHeight, getIntersection, getWidth, isEmpty} from '../../extent.js';\nimport VectorRenderType from '../../layer/VectorRenderType.js';\nimport {assign} from '../../obj.js';\nimport {layerRendererConstructors} from './Map.js';\nimport IntermediateCanvasRenderer from './IntermediateCanvas.js';\nimport {create as createTransform, compose as composeTransform} from '../../transform.js';\n\n/**\n * @classdesc\n * Canvas renderer for image layers.\n * @api\n */\nclass CanvasImageLayerRenderer extends IntermediateCanvasRenderer {\n\n  /**\n   * @param {import(\"../../layer/Image.js\").default|import(\"../../layer/Vector.js\").default} imageLayer Image or vector layer.\n   */\n  constructor(imageLayer) {\n\n    super(imageLayer);\n\n    /**\n     * @private\n     * @type {?import(\"../../ImageBase.js\").default}\n     */\n    this.image_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../../transform.js\").Transform}\n     */\n    this.imageTransform_ = createTransform();\n\n    /**\n     * @type {!Array<string>}\n     */\n    this.skippedFeatures_ = [];\n\n    /**\n     * @private\n     * @type {import(\"./VectorLayer.js\").default}\n     */\n    this.vectorRenderer_ = null;\n\n    if (imageLayer.getType() === LayerType.VECTOR) {\n      for (let i = 0, ii = layerRendererConstructors.length; i < ii; ++i) {\n        const ctor = layerRendererConstructors[i];\n        if (ctor !== CanvasImageLayerRenderer && ctor['handles'](imageLayer)) {\n          this.vectorRenderer_ = /** @type {import(\"./VectorLayer.js\").default} */ (new ctor(imageLayer));\n          break;\n        }\n      }\n    }\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    if (this.vectorRenderer_) {\n      this.vectorRenderer_.dispose();\n    }\n    super.disposeInternal();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImage() {\n    return !this.image_ ? null : this.image_.getImage();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImageTransform() {\n    return this.imageTransform_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  prepareFrame(frameState, layerState) {\n\n    const pixelRatio = frameState.pixelRatio;\n    const size = frameState.size;\n    const viewState = frameState.viewState;\n    const viewCenter = viewState.center;\n    const viewResolution = viewState.resolution;\n\n    let image;\n    const imageLayer = /** @type {import(\"../../layer/Image.js\").default} */ (this.getLayer());\n    const imageSource = /** @type {import(\"../../source/Image.js\").default} */ (imageLayer.getSource());\n\n    const hints = frameState.viewHints;\n\n    const vectorRenderer = this.vectorRenderer_;\n    let renderedExtent = frameState.extent;\n    if (!vectorRenderer && layerState.extent !== undefined) {\n      renderedExtent = getIntersection(renderedExtent, layerState.extent);\n    }\n\n    if (!hints[ViewHint.ANIMATING] && !hints[ViewHint.INTERACTING] &&\n        !isEmpty(renderedExtent)) {\n      let projection = viewState.projection;\n      if (!ENABLE_RASTER_REPROJECTION) {\n        const sourceProjection = imageSource.getProjection();\n        if (sourceProjection) {\n          projection = sourceProjection;\n        }\n      }\n      let skippedFeatures = this.skippedFeatures_;\n      if (vectorRenderer) {\n        const context = vectorRenderer.context;\n        const imageFrameState = /** @type {import(\"../../PluggableMap.js\").FrameState} */ (assign({}, frameState, {\n          size: [\n            getWidth(renderedExtent) / viewResolution,\n            getHeight(renderedExtent) / viewResolution\n          ],\n          viewState: /** @type {import(\"../../View.js\").State} */ (assign({}, frameState.viewState, {\n            rotation: 0\n          }))\n        }));\n        const newSkippedFeatures = Object.keys(imageFrameState.skippedFeatureUids).sort();\n        image = new ImageCanvas(renderedExtent, viewResolution, pixelRatio, context.canvas, function(callback) {\n          if (vectorRenderer.prepareFrame(imageFrameState, layerState) &&\n              (vectorRenderer.replayGroupChanged ||\n              !equals(skippedFeatures, newSkippedFeatures))) {\n            context.canvas.width = imageFrameState.size[0] * pixelRatio;\n            context.canvas.height = imageFrameState.size[1] * pixelRatio;\n            vectorRenderer.compose(context, imageFrameState, layerState);\n            skippedFeatures = newSkippedFeatures;\n            callback();\n          }\n        });\n      } else {\n        image = imageSource.getImage(\n          renderedExtent, viewResolution, pixelRatio, projection);\n      }\n      if (image && this.loadImage(image)) {\n        this.image_ = image;\n        this.skippedFeatures_ = skippedFeatures;\n      }\n    }\n\n    if (this.image_) {\n      image = this.image_;\n      const imageExtent = image.getExtent();\n      const imageResolution = image.getResolution();\n      const imagePixelRatio = image.getPixelRatio();\n      const scale = pixelRatio * imageResolution /\n          (viewResolution * imagePixelRatio);\n      const transform = composeTransform(this.imageTransform_,\n        pixelRatio * size[0] / 2, pixelRatio * size[1] / 2,\n        scale, scale,\n        0,\n        imagePixelRatio * (imageExtent[0] - viewCenter[0]) / imageResolution,\n        imagePixelRatio * (viewCenter[1] - imageExtent[3]) / imageResolution);\n      composeTransform(this.coordinateToCanvasPixelTransform,\n        pixelRatio * size[0] / 2 - transform[4], pixelRatio * size[1] / 2 - transform[5],\n        pixelRatio / viewResolution, -pixelRatio / viewResolution,\n        0,\n        -viewCenter[0], -viewCenter[1]);\n\n      this.renderedResolution = imageResolution * pixelRatio / imagePixelRatio;\n    }\n\n    return !!this.image_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback) {\n    if (this.vectorRenderer_) {\n      return this.vectorRenderer_.forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback);\n    } else {\n      return super.forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback);\n    }\n  }\n}\n\n\n/**\n * Determine if this renderer handles the provided layer.\n * @param {import(\"../../layer/Layer.js\").default} layer The candidate layer.\n * @return {boolean} The renderer can render the layer.\n */\nCanvasImageLayerRenderer['handles'] = function(layer) {\n  return layer.getType() === LayerType.IMAGE ||\n    layer.getType() === LayerType.VECTOR &&\n    /** @type {import(\"../../layer/Vector.js\").default} */ (layer).getRenderMode() === VectorRenderType.IMAGE;\n};\n\n\n/**\n * Create a layer renderer.\n * @param {import(\"../Map.js\").default} mapRenderer The map renderer.\n * @param {import(\"../../layer/Layer.js\").default} layer The layer to be rendererd.\n * @return {CanvasImageLayerRenderer} The layer renderer.\n */\nCanvasImageLayerRenderer['create'] = function(mapRenderer, layer) {\n  return new CanvasImageLayerRenderer(/** @type {import(\"../../layer/Image.js\").default} */ (layer));\n};\n\n\nexport default CanvasImageLayerRenderer;\n","/**\n * @module ol/TileRange\n */\n\n/**\n * A representation of a contiguous block of tiles.  A tile range is specified\n * by its min/max tile coordinates and is inclusive of coordinates.\n */\nclass TileRange {\n\n  /**\n   * @param {number} minX Minimum X.\n   * @param {number} maxX Maximum X.\n   * @param {number} minY Minimum Y.\n   * @param {number} maxY Maximum Y.\n   */\n  constructor(minX, maxX, minY, maxY) {\n\n    /**\n     * @type {number}\n     */\n    this.minX = minX;\n\n    /**\n     * @type {number}\n     */\n    this.maxX = maxX;\n\n    /**\n     * @type {number}\n     */\n    this.minY = minY;\n\n    /**\n     * @type {number}\n     */\n    this.maxY = maxY;\n\n  }\n\n  /**\n   * @param {import(\"./tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n   * @return {boolean} Contains tile coordinate.\n   */\n  contains(tileCoord) {\n    return this.containsXY(tileCoord[1], tileCoord[2]);\n  }\n\n  /**\n   * @param {TileRange} tileRange Tile range.\n   * @return {boolean} Contains.\n   */\n  containsTileRange(tileRange) {\n    return this.minX <= tileRange.minX && tileRange.maxX <= this.maxX &&\n       this.minY <= tileRange.minY && tileRange.maxY <= this.maxY;\n  }\n\n  /**\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @return {boolean} Contains coordinate.\n   */\n  containsXY(x, y) {\n    return this.minX <= x && x <= this.maxX && this.minY <= y && y <= this.maxY;\n  }\n\n  /**\n   * @param {TileRange} tileRange Tile range.\n   * @return {boolean} Equals.\n   */\n  equals(tileRange) {\n    return this.minX == tileRange.minX && this.minY == tileRange.minY &&\n       this.maxX == tileRange.maxX && this.maxY == tileRange.maxY;\n  }\n\n  /**\n   * @param {TileRange} tileRange Tile range.\n   */\n  extend(tileRange) {\n    if (tileRange.minX < this.minX) {\n      this.minX = tileRange.minX;\n    }\n    if (tileRange.maxX > this.maxX) {\n      this.maxX = tileRange.maxX;\n    }\n    if (tileRange.minY < this.minY) {\n      this.minY = tileRange.minY;\n    }\n    if (tileRange.maxY > this.maxY) {\n      this.maxY = tileRange.maxY;\n    }\n  }\n\n  /**\n   * @return {number} Height.\n   */\n  getHeight() {\n    return this.maxY - this.minY + 1;\n  }\n\n  /**\n   * @return {import(\"./size.js\").Size} Size.\n   */\n  getSize() {\n    return [this.getWidth(), this.getHeight()];\n  }\n\n  /**\n   * @return {number} Width.\n   */\n  getWidth() {\n    return this.maxX - this.minX + 1;\n  }\n\n  /**\n   * @param {TileRange} tileRange Tile range.\n   * @return {boolean} Intersects.\n   */\n  intersects(tileRange) {\n    return this.minX <= tileRange.maxX &&\n       this.maxX >= tileRange.minX &&\n       this.minY <= tileRange.maxY &&\n       this.maxY >= tileRange.minY;\n  }\n}\n\n\n/**\n * @param {number} minX Minimum X.\n * @param {number} maxX Maximum X.\n * @param {number} minY Minimum Y.\n * @param {number} maxY Maximum Y.\n * @param {TileRange=} tileRange TileRange.\n * @return {TileRange} Tile range.\n */\nexport function createOrUpdate(minX, maxX, minY, maxY, tileRange) {\n  if (tileRange !== undefined) {\n    tileRange.minX = minX;\n    tileRange.maxX = maxX;\n    tileRange.minY = minY;\n    tileRange.maxY = maxY;\n    return tileRange;\n  } else {\n    return new TileRange(minX, maxX, minY, maxY);\n  }\n}\n\n\nexport default TileRange;\n","/**\n * @module ol/renderer/canvas/TileLayer\n */\nimport {getUid} from '../../util.js';\nimport LayerType from '../../LayerType.js';\nimport TileRange from '../../TileRange.js';\nimport TileState from '../../TileState.js';\nimport ViewHint from '../../ViewHint.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {containsExtent, createEmpty, equals, getIntersection, isEmpty} from '../../extent.js';\nimport IntermediateCanvasRenderer from './IntermediateCanvas.js';\nimport {create as createTransform, compose as composeTransform} from '../../transform.js';\n\n/**\n * @classdesc\n * Canvas renderer for tile layers.\n * @api\n */\nclass CanvasTileLayerRenderer extends IntermediateCanvasRenderer {\n\n  /**\n   * @param {import(\"../../layer/Tile.js\").default|import(\"../../layer/VectorTile.js\").default} tileLayer Tile layer.\n   * @param {boolean=} opt_noContext Skip the context creation.\n   */\n  constructor(tileLayer, opt_noContext) {\n\n    super(tileLayer);\n\n    /**\n     * @protected\n     * @type {CanvasRenderingContext2D}\n     */\n    this.context = opt_noContext ? null : createCanvasContext2D();\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.oversampling_;\n\n    /**\n     * @private\n     * @type {import(\"../../extent.js\").Extent}\n     */\n    this.renderedExtent_ = null;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.renderedRevision;\n\n    /**\n     * @protected\n     * @type {!Array<import(\"../../Tile.js\").default>}\n     */\n    this.renderedTiles = [];\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.newTiles_ = false;\n\n    /**\n     * @protected\n     * @type {import(\"../../extent.js\").Extent}\n     */\n    this.tmpExtent = createEmpty();\n\n    /**\n     * @private\n     * @type {import(\"../../TileRange.js\").default}\n     */\n    this.tmpTileRange_ = new TileRange(0, 0, 0, 0);\n\n    /**\n     * @private\n     * @type {import(\"../../transform.js\").Transform}\n     */\n    this.imageTransform_ = createTransform();\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.zDirection = 0;\n\n  }\n\n  /**\n   * @private\n   * @param {import(\"../../Tile.js\").default} tile Tile.\n   * @return {boolean} Tile is drawable.\n   */\n  isDrawableTile_(tile) {\n    const tileLayer = /** @type {import(\"../../layer/Tile.js\").default} */ (this.getLayer());\n    const tileState = tile.getState();\n    const useInterimTilesOnError = tileLayer.getUseInterimTilesOnError();\n    return tileState == TileState.LOADED ||\n        tileState == TileState.EMPTY ||\n        tileState == TileState.ERROR && !useInterimTilesOnError;\n  }\n\n  /**\n   * @param {number} z Tile coordinate z.\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"../../proj/Projection.js\").default} projection Projection.\n   * @return {!import(\"../../Tile.js\").default} Tile.\n   */\n  getTile(z, x, y, pixelRatio, projection) {\n    const tileLayer = /** @type {import(\"../../layer/Tile.js\").default} */ (this.getLayer());\n    const tileSource = /** @type {import(\"../../source/Tile.js\").default} */ (tileLayer.getSource());\n    let tile = tileSource.getTile(z, x, y, pixelRatio, projection);\n    if (tile.getState() == TileState.ERROR) {\n      if (!tileLayer.getUseInterimTilesOnError()) {\n        // When useInterimTilesOnError is false, we consider the error tile as loaded.\n        tile.setState(TileState.LOADED);\n      } else if (tileLayer.getPreload() > 0) {\n        // Preloaded tiles for lower resolutions might have finished loading.\n        this.newTiles_ = true;\n      }\n    }\n    if (!this.isDrawableTile_(tile)) {\n      tile = tile.getInterimTile();\n    }\n    return tile;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  prepareFrame(frameState, layerState) {\n\n    const pixelRatio = frameState.pixelRatio;\n    const size = frameState.size;\n    const viewState = frameState.viewState;\n    const projection = viewState.projection;\n    const viewResolution = viewState.resolution;\n    const viewCenter = viewState.center;\n\n    const tileLayer = /** @type {import(\"../../layer/Tile.js\").default} */ (this.getLayer());\n    const tileSource = /** @type {import(\"../../source/Tile.js\").default} */ (tileLayer.getSource());\n    const sourceRevision = tileSource.getRevision();\n    const tileGrid = tileSource.getTileGridForProjection(projection);\n    const z = tileGrid.getZForResolution(viewResolution, this.zDirection);\n    const tileResolution = tileGrid.getResolution(z);\n    let oversampling = Math.round(viewResolution / tileResolution) || 1;\n    let extent = frameState.extent;\n\n    if (layerState.extent !== undefined) {\n      extent = getIntersection(extent, layerState.extent);\n    }\n    if (isEmpty(extent)) {\n      // Return false to prevent the rendering of the layer.\n      return false;\n    }\n\n    const tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);\n    const imageExtent = tileGrid.getTileRangeExtent(z, tileRange);\n\n    const tilePixelRatio = tileSource.getTilePixelRatio(pixelRatio);\n\n    /**\n     * @type {Object<number, Object<string, import(\"../../Tile.js\").default>>}\n     */\n    const tilesToDrawByZ = {};\n    tilesToDrawByZ[z] = {};\n\n    const findLoadedTiles = this.createLoadedTileFinder(\n      tileSource, projection, tilesToDrawByZ);\n\n    const hints = frameState.viewHints;\n    const animatingOrInteracting = hints[ViewHint.ANIMATING] || hints[ViewHint.INTERACTING];\n\n    const tmpExtent = this.tmpExtent;\n    const tmpTileRange = this.tmpTileRange_;\n    this.newTiles_ = false;\n    let tile, x, y;\n    for (x = tileRange.minX; x <= tileRange.maxX; ++x) {\n      for (y = tileRange.minY; y <= tileRange.maxY; ++y) {\n        if (Date.now() - frameState.time > 16 && animatingOrInteracting) {\n          continue;\n        }\n        tile = this.getTile(z, x, y, pixelRatio, projection);\n        if (this.isDrawableTile_(tile)) {\n          const uid = getUid(this);\n          if (tile.getState() == TileState.LOADED) {\n            tilesToDrawByZ[z][tile.tileCoord.toString()] = tile;\n            const inTransition = tile.inTransition(uid);\n            if (!this.newTiles_ && (inTransition || this.renderedTiles.indexOf(tile) === -1)) {\n              this.newTiles_ = true;\n            }\n          }\n          if (tile.getAlpha(uid, frameState.time) === 1) {\n            // don't look for alt tiles if alpha is 1\n            continue;\n          }\n        }\n\n        const childTileRange = tileGrid.getTileCoordChildTileRange(\n          tile.tileCoord, tmpTileRange, tmpExtent);\n        let covered = false;\n        if (childTileRange) {\n          covered = findLoadedTiles(z + 1, childTileRange);\n        }\n        if (!covered) {\n          tileGrid.forEachTileCoordParentTileRange(\n            tile.tileCoord, findLoadedTiles, null, tmpTileRange, tmpExtent);\n        }\n\n      }\n    }\n\n    const renderedResolution = tileResolution * pixelRatio / tilePixelRatio * oversampling;\n    if (!(this.renderedResolution && Date.now() - frameState.time > 16 && animatingOrInteracting) && (\n      this.newTiles_ ||\n          !(this.renderedExtent_ && containsExtent(this.renderedExtent_, extent)) ||\n          this.renderedRevision != sourceRevision ||\n          oversampling != this.oversampling_ ||\n          !animatingOrInteracting && renderedResolution != this.renderedResolution\n    )) {\n\n      const context = this.context;\n      if (context) {\n        const tilePixelSize = tileSource.getTilePixelSize(z, pixelRatio, projection);\n        const width = Math.round(tileRange.getWidth() * tilePixelSize[0] / oversampling);\n        const height = Math.round(tileRange.getHeight() * tilePixelSize[1] / oversampling);\n        const canvas = context.canvas;\n        if (canvas.width != width || canvas.height != height) {\n          this.oversampling_ = oversampling;\n          canvas.width = width;\n          canvas.height = height;\n        } else {\n          if ((this.renderedExtent_ && !equals(imageExtent, this.renderedExtent_)) ||\n              this.renderedRevision != sourceRevision) {\n            context.clearRect(0, 0, width, height);\n          }\n          oversampling = this.oversampling_;\n        }\n      }\n\n      this.renderedTiles.length = 0;\n      /** @type {Array<number>} */\n      const zs = Object.keys(tilesToDrawByZ).map(Number);\n      zs.sort(function(a, b) {\n        if (a === z) {\n          return 1;\n        } else if (b === z) {\n          return -1;\n        } else {\n          return a > b ? 1 : a < b ? -1 : 0;\n        }\n      });\n      let currentResolution, currentScale, currentTilePixelSize, currentZ, i, ii;\n      let tileExtent, tileGutter, tilesToDraw, w, h;\n      for (i = 0, ii = zs.length; i < ii; ++i) {\n        currentZ = zs[i];\n        currentTilePixelSize = tileSource.getTilePixelSize(currentZ, pixelRatio, projection);\n        currentResolution = tileGrid.getResolution(currentZ);\n        currentScale = currentResolution / tileResolution;\n        tileGutter = tilePixelRatio * tileSource.getGutterForProjection(projection);\n        tilesToDraw = tilesToDrawByZ[currentZ];\n        for (const tileCoordKey in tilesToDraw) {\n          tile = tilesToDraw[tileCoordKey];\n          tileExtent = tileGrid.getTileCoordExtent(tile.getTileCoord(), tmpExtent);\n          x = (tileExtent[0] - imageExtent[0]) / tileResolution * tilePixelRatio / oversampling;\n          y = (imageExtent[3] - tileExtent[3]) / tileResolution * tilePixelRatio / oversampling;\n          w = currentTilePixelSize[0] * currentScale / oversampling;\n          h = currentTilePixelSize[1] * currentScale / oversampling;\n          this.drawTileImage(tile, frameState, layerState, x, y, w, h, tileGutter, z === currentZ);\n          this.renderedTiles.push(tile);\n        }\n      }\n\n      this.renderedRevision = sourceRevision;\n      this.renderedResolution = tileResolution * pixelRatio / tilePixelRatio * oversampling;\n      this.renderedExtent_ = imageExtent;\n    }\n\n    const scale = this.renderedResolution / viewResolution;\n    const transform = composeTransform(this.imageTransform_,\n      pixelRatio * size[0] / 2, pixelRatio * size[1] / 2,\n      scale, scale,\n      0,\n      (this.renderedExtent_[0] - viewCenter[0]) / this.renderedResolution * pixelRatio,\n      (viewCenter[1] - this.renderedExtent_[3]) / this.renderedResolution * pixelRatio);\n    composeTransform(this.coordinateToCanvasPixelTransform,\n      pixelRatio * size[0] / 2 - transform[4], pixelRatio * size[1] / 2 - transform[5],\n      pixelRatio / viewResolution, -pixelRatio / viewResolution,\n      0,\n      -viewCenter[0], -viewCenter[1]);\n\n\n    this.updateUsedTiles(frameState.usedTiles, tileSource, z, tileRange);\n    this.manageTilePyramid(frameState, tileSource, tileGrid, pixelRatio,\n      projection, extent, z, tileLayer.getPreload());\n    this.scheduleExpireCache(frameState, tileSource);\n\n    return this.renderedTiles.length > 0;\n  }\n\n  /**\n   * @param {import(\"../../Tile.js\").default} tile Tile.\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../../layer/Layer.js\").State} layerState Layer state.\n   * @param {number} x Left of the tile.\n   * @param {number} y Top of the tile.\n   * @param {number} w Width of the tile.\n   * @param {number} h Height of the tile.\n   * @param {number} gutter Tile gutter.\n   * @param {boolean} transition Apply an alpha transition.\n   */\n  drawTileImage(tile, frameState, layerState, x, y, w, h, gutter, transition) {\n    const image = this.getTileImage(tile);\n    if (!image) {\n      return;\n    }\n    const uid = getUid(this);\n    const alpha = transition ? tile.getAlpha(uid, frameState.time) : 1;\n    const tileLayer = /** @type {import(\"../../layer/Tile.js\").default} */ (this.getLayer());\n    const tileSource = /** @type {import(\"../../source/Tile.js\").default} */ (tileLayer.getSource());\n    if (alpha === 1 && !tileSource.getOpaque(frameState.viewState.projection)) {\n      this.context.clearRect(x, y, w, h);\n    }\n    const alphaChanged = alpha !== this.context.globalAlpha;\n    if (alphaChanged) {\n      this.context.save();\n      this.context.globalAlpha = alpha;\n    }\n    this.context.drawImage(image, gutter, gutter,\n      image.width - 2 * gutter, image.height - 2 * gutter, x, y, w, h);\n\n    if (alphaChanged) {\n      this.context.restore();\n    }\n    if (alpha !== 1) {\n      frameState.animate = true;\n    } else if (transition) {\n      tile.endTransition(uid);\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImage() {\n    const context = this.context;\n    return context ? context.canvas : null;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getImageTransform() {\n    return this.imageTransform_;\n  }\n\n  /**\n   * Get the image from a tile.\n   * @param {import(\"../../Tile.js\").default} tile Tile.\n   * @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.\n   * @protected\n   */\n  getTileImage(tile) {\n    return /** @type {import(\"../../ImageTile.js\").default} */ (tile).getImage();\n  }\n}\n\n\n/**\n * Determine if this renderer handles the provided layer.\n * @param {import(\"../../layer/Layer.js\").default} layer The candidate layer.\n * @return {boolean} The renderer can render the layer.\n */\nCanvasTileLayerRenderer['handles'] = function(layer) {\n  return layer.getType() === LayerType.TILE;\n};\n\n\n/**\n * Create a layer renderer.\n * @param {import(\"../Map.js\").default} mapRenderer The map renderer.\n * @param {import(\"../../layer/Layer.js\").default} layer The layer to be rendererd.\n * @return {CanvasTileLayerRenderer} The layer renderer.\n */\nCanvasTileLayerRenderer['create'] = function(mapRenderer, layer) {\n  return new CanvasTileLayerRenderer(/** @type {import(\"../../layer/Tile.js\").default} */ (layer));\n};\n\n\n/**\n * @function\n * @return {import(\"../../layer/Tile.js\").default|import(\"../../layer/VectorTile.js\").default}\n */\nCanvasTileLayerRenderer.prototype.getLayer;\n\n\nexport default CanvasTileLayerRenderer;\n","/**\n * @module ol/render/ReplayGroup\n */\nimport {abstract} from '../util.js';\n\n/**\n * Base class for replay groups.\n */\nclass ReplayGroup {\n  /**\n   * @abstract\n   * @param {number|undefined} zIndex Z index.\n   * @param {import(\"./ReplayType.js\").default} replayType Replay type.\n   * @return {import(\"./VectorContext.js\").default} Replay.\n   */\n  getReplay(zIndex, replayType) {\n    return abstract();\n  }\n\n  /**\n   * @abstract\n   * @return {boolean} Is empty.\n   */\n  isEmpty() {\n    return abstract();\n  }\n\n  /**\n   * @abstract\n   * @param {boolean} group Group with previous replay\n   * @return {Array<*>} The resulting instruction group\n   */\n  addDeclutter(group) {\n    return abstract();\n  }\n}\n\nexport default ReplayGroup;\n","/**\n * @module ol/render/ReplayType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  CIRCLE: 'Circle',\n  DEFAULT: 'Default',\n  IMAGE: 'Image',\n  LINE_STRING: 'LineString',\n  POLYGON: 'Polygon',\n  TEXT: 'Text'\n};\n","/**\n * @module ol/geom/flat/textpath\n */\nimport {lerp} from '../../math.js';\n\n\n/**\n * @param {Array<number>} flatCoordinates Path to put text on.\n * @param {number} offset Start offset of the `flatCoordinates`.\n * @param {number} end End offset of the `flatCoordinates`.\n * @param {number} stride Stride.\n * @param {string} text Text to place on the path.\n * @param {function(string):number} measure Measure function returning the\n * width of the character passed as 1st argument.\n * @param {number} startM m along the path where the text starts.\n * @param {number} maxAngle Max angle between adjacent chars in radians.\n * @return {Array<Array<*>>} The result array of null if `maxAngle` was\n * exceeded. Entries of the array are x, y, anchorX, angle, chunk.\n */\nexport function drawTextOnPath(\n  flatCoordinates, offset, end, stride, text, measure, startM, maxAngle) {\n  const result = [];\n\n  // Keep text upright\n  const reverse = flatCoordinates[offset] > flatCoordinates[end - stride];\n\n  const numChars = text.length;\n\n  let x1 = flatCoordinates[offset];\n  let y1 = flatCoordinates[offset + 1];\n  offset += stride;\n  let x2 = flatCoordinates[offset];\n  let y2 = flatCoordinates[offset + 1];\n  let segmentM = 0;\n  let segmentLength = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));\n\n  let chunk = '';\n  let chunkLength = 0;\n  let data, index, previousAngle;\n  for (let i = 0; i < numChars; ++i) {\n    index = reverse ? numChars - i - 1 : i;\n    const char = text.charAt(index);\n    chunk = reverse ? char + chunk : chunk + char;\n    const charLength = measure(chunk) - chunkLength;\n    chunkLength += charLength;\n    const charM = startM + charLength / 2;\n    while (offset < end - stride && segmentM + segmentLength < charM) {\n      x1 = x2;\n      y1 = y2;\n      offset += stride;\n      x2 = flatCoordinates[offset];\n      y2 = flatCoordinates[offset + 1];\n      segmentM += segmentLength;\n      segmentLength = Math.sqrt(Math.pow(x2 - x1, 2) + Math.pow(y2 - y1, 2));\n    }\n    const segmentPos = charM - segmentM;\n    let angle = Math.atan2(y2 - y1, x2 - x1);\n    if (reverse) {\n      angle += angle > 0 ? -Math.PI : Math.PI;\n    }\n    if (previousAngle !== undefined) {\n      let delta = angle - previousAngle;\n      delta += (delta > Math.PI) ? -2 * Math.PI : (delta < -Math.PI) ? 2 * Math.PI : 0;\n      if (Math.abs(delta) > maxAngle) {\n        return null;\n      }\n    }\n    const interpolate = segmentPos / segmentLength;\n    const x = lerp(x1, x2, interpolate);\n    const y = lerp(y1, y2, interpolate);\n    if (previousAngle == angle) {\n      if (reverse) {\n        data[0] = x;\n        data[1] = y;\n        data[2] = charLength / 2;\n      }\n      data[4] = chunk;\n    } else {\n      chunk = char;\n      chunkLength = charLength;\n      data = [x, y, charLength / 2, angle, chunk];\n      if (reverse) {\n        result.unshift(data);\n      } else {\n        result.push(data);\n      }\n      previousAngle = angle;\n    }\n    startM += charLength;\n  }\n  return result;\n}\n","/**\n * @module ol/render/canvas/Instruction\n */\n\n/**\n * @enum {number}\n */\nconst Instruction = {\n  BEGIN_GEOMETRY: 0,\n  BEGIN_PATH: 1,\n  CIRCLE: 2,\n  CLOSE_PATH: 3,\n  CUSTOM: 4,\n  DRAW_CHARS: 5,\n  DRAW_IMAGE: 6,\n  END_GEOMETRY: 7,\n  FILL: 8,\n  MOVE_TO_LINE_TO: 9,\n  SET_FILL_STYLE: 10,\n  SET_STROKE_STYLE: 11,\n  STROKE: 12\n};\n\n\n/**\n * @type {Array<Instruction>}\n */\nexport const fillInstruction = [Instruction.FILL];\n\n\n/**\n * @type {Array<Instruction>}\n */\nexport const strokeInstruction = [Instruction.STROKE];\n\n\n/**\n * @type {Array<Instruction>}\n */\nexport const beginPathInstruction = [Instruction.BEGIN_PATH];\n\n\n/**\n * @type {Array<Instruction>}\n */\nexport const closePathInstruction = [Instruction.CLOSE_PATH];\n\n\nexport default Instruction;\n","/**\n * @module ol/render/replay\n */\nimport ReplayType from './ReplayType.js';\n\n\n/**\n * @const\n * @type {Array<ReplayType>}\n */\nexport const ORDER = [\n  ReplayType.POLYGON,\n  ReplayType.CIRCLE,\n  ReplayType.LINE_STRING,\n  ReplayType.IMAGE,\n  ReplayType.TEXT,\n  ReplayType.DEFAULT\n];\n\n/**\n * @const\n * @enum {number}\n */\nexport const TEXT_ALIGN = {};\nTEXT_ALIGN['left'] = 0;\nTEXT_ALIGN['end'] = 0;\nTEXT_ALIGN['center'] = 0.5;\nTEXT_ALIGN['right'] = 1;\nTEXT_ALIGN['start'] = 1;\nTEXT_ALIGN['top'] = 0;\nTEXT_ALIGN['middle'] = 0.5;\nTEXT_ALIGN['hanging'] = 0.2;\nTEXT_ALIGN['alphabetic'] = 0.8;\nTEXT_ALIGN['ideographic'] = 0.8;\nTEXT_ALIGN['bottom'] = 1;\n","/**\n * @module ol/render/canvas/Replay\n */\nimport {getUid} from '../../util.js';\nimport {equals, reverseSubArray} from '../../array.js';\nimport {asColorLike} from '../../colorlike.js';\nimport {buffer, clone, coordinateRelationship, createEmpty, createOrUpdate,\n  createOrUpdateEmpty, extend, extendCoordinate, intersects} from '../../extent.js';\nimport Relationship from '../../extent/Relationship.js';\nimport GeometryType from '../../geom/GeometryType.js';\nimport {inflateCoordinates, inflateCoordinatesArray, inflateMultiCoordinatesArray} from '../../geom/flat/inflate.js';\nimport {lineStringLength} from '../../geom/flat/length.js';\nimport {drawTextOnPath} from '../../geom/flat/textpath.js';\nimport {transform2D} from '../../geom/flat/transform.js';\nimport {CANVAS_LINE_DASH} from '../../has.js';\nimport {isEmpty} from '../../obj.js';\nimport VectorContext from '../VectorContext.js';\nimport {drawImage, resetTransform, defaultPadding, defaultFillStyle, defaultStrokeStyle,\n  defaultMiterLimit, defaultLineWidth, defaultLineJoin, defaultLineDashOffset,\n  defaultLineDash, defaultLineCap} from '../canvas.js';\nimport CanvasInstruction from './Instruction.js';\nimport {TEXT_ALIGN} from '../replay.js';\nimport {\n  create as createTransform,\n  compose as composeTransform,\n  apply as applyTransform,\n  setFromArray as transformSetFromArray\n} from '../../transform.js';\n\n\n/**\n * @type {import(\"../../extent.js\").Extent}\n */\nconst tmpExtent = createEmpty();\n\n\n/**\n * @type {!import(\"../../transform.js\").Transform}\n */\nconst tmpTransform = createTransform();\n\n\nclass CanvasReplay extends VectorContext {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {import(\"../../extent.js\").Extent} maxExtent Maximum extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree.\n   */\n  constructor(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree) {\n    super();\n\n    /**\n     * @type {?}\n     */\n    this.declutterTree = declutterTree;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.tolerance = tolerance;\n\n    /**\n     * @protected\n     * @const\n     * @type {import(\"../../extent.js\").Extent}\n     */\n    this.maxExtent = maxExtent;\n\n    /**\n     * @protected\n     * @type {boolean}\n     */\n    this.overlaps = overlaps;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.pixelRatio = pixelRatio;\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.maxLineWidth = 0;\n\n    /**\n     * @protected\n     * @const\n     * @type {number}\n     */\n    this.resolution = resolution;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.alignFill_;\n\n    /**\n     * @private\n     * @type {Array<*>}\n     */\n    this.beginGeometryInstruction1_ = null;\n\n    /**\n     * @private\n     * @type {Array<*>}\n     */\n    this.beginGeometryInstruction2_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../../extent.js\").Extent}\n     */\n    this.bufferedMaxExtent_ = null;\n\n    /**\n     * @protected\n     * @type {Array<*>}\n     */\n    this.instructions = [];\n\n    /**\n     * @protected\n     * @type {Array<number>}\n     */\n    this.coordinates = [];\n\n    /**\n     * @private\n     * @type {!Object<number,import(\"../../coordinate.js\").Coordinate|Array<import(\"../../coordinate.js\").Coordinate>|Array<Array<import(\"../../coordinate.js\").Coordinate>>>}\n     */\n    this.coordinateCache_ = {};\n\n    /**\n     * @private\n     * @type {!import(\"../../transform.js\").Transform}\n     */\n    this.renderedTransform_ = createTransform();\n\n    /**\n     * @protected\n     * @type {Array<*>}\n     */\n    this.hitDetectionInstructions = [];\n\n    /**\n     * @private\n     * @type {Array<number>}\n     */\n    this.pixelCoordinates_ = null;\n\n    /**\n     * @protected\n     * @type {import(\"../canvas.js\").FillStrokeState}\n     */\n    this.state = /** @type {import(\"../canvas.js\").FillStrokeState} */ ({});\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.viewRotation_ = 0;\n\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../coordinate.js\").Coordinate} p1 1st point of the background box.\n   * @param {import(\"../../coordinate.js\").Coordinate} p2 2nd point of the background box.\n   * @param {import(\"../../coordinate.js\").Coordinate} p3 3rd point of the background box.\n   * @param {import(\"../../coordinate.js\").Coordinate} p4 4th point of the background box.\n   * @param {Array<*>} fillInstruction Fill instruction.\n   * @param {Array<*>} strokeInstruction Stroke instruction.\n   */\n  replayTextBackground_(context, p1, p2, p3, p4, fillInstruction, strokeInstruction) {\n    context.beginPath();\n    context.moveTo.apply(context, p1);\n    context.lineTo.apply(context, p2);\n    context.lineTo.apply(context, p3);\n    context.lineTo.apply(context, p4);\n    context.lineTo.apply(context, p1);\n    if (fillInstruction) {\n      this.alignFill_ = /** @type {boolean} */ (fillInstruction[2]);\n      this.fill_(context);\n    }\n    if (strokeInstruction) {\n      this.setStrokeStyle_(context, /** @type {Array<*>} */ (strokeInstruction));\n      context.stroke();\n    }\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {number} x X.\n   * @param {number} y Y.\n   * @param {HTMLImageElement|HTMLCanvasElement|HTMLVideoElement} image Image.\n   * @param {number} anchorX Anchor X.\n   * @param {number} anchorY Anchor Y.\n   * @param {import(\"../canvas.js\").DeclutterGroup} declutterGroup Declutter group.\n   * @param {number} height Height.\n   * @param {number} opacity Opacity.\n   * @param {number} originX Origin X.\n   * @param {number} originY Origin Y.\n   * @param {number} rotation Rotation.\n   * @param {number} scale Scale.\n   * @param {boolean} snapToPixel Snap to pixel.\n   * @param {number} width Width.\n   * @param {Array<number>} padding Padding.\n   * @param {Array<*>} fillInstruction Fill instruction.\n   * @param {Array<*>} strokeInstruction Stroke instruction.\n   */\n  replayImage_(\n    context,\n    x,\n    y,\n    image,\n    anchorX,\n    anchorY,\n    declutterGroup,\n    height,\n    opacity,\n    originX,\n    originY,\n    rotation,\n    scale,\n    snapToPixel,\n    width,\n    padding,\n    fillInstruction,\n    strokeInstruction\n  ) {\n    const fillStroke = fillInstruction || strokeInstruction;\n    anchorX *= scale;\n    anchorY *= scale;\n    x -= anchorX;\n    y -= anchorY;\n\n    const w = (width + originX > image.width) ? image.width - originX : width;\n    const h = (height + originY > image.height) ? image.height - originY : height;\n    const boxW = padding[3] + w * scale + padding[1];\n    const boxH = padding[0] + h * scale + padding[2];\n    const boxX = x - padding[3];\n    const boxY = y - padding[0];\n\n    /** @type {import(\"../../coordinate.js\").Coordinate} */\n    let p1;\n    /** @type {import(\"../../coordinate.js\").Coordinate} */\n    let p2;\n    /** @type {import(\"../../coordinate.js\").Coordinate} */\n    let p3;\n    /** @type {import(\"../../coordinate.js\").Coordinate} */\n    let p4;\n    if (fillStroke || rotation !== 0) {\n      p1 = [boxX, boxY];\n      p2 = [boxX + boxW, boxY];\n      p3 = [boxX + boxW, boxY + boxH];\n      p4 = [boxX, boxY + boxH];\n    }\n\n    let transform = null;\n    if (rotation !== 0) {\n      const centerX = x + anchorX;\n      const centerY = y + anchorY;\n      transform = composeTransform(tmpTransform, centerX, centerY, 1, 1, rotation, -centerX, -centerY);\n\n      createOrUpdateEmpty(tmpExtent);\n      extendCoordinate(tmpExtent, applyTransform(tmpTransform, p1));\n      extendCoordinate(tmpExtent, applyTransform(tmpTransform, p2));\n      extendCoordinate(tmpExtent, applyTransform(tmpTransform, p3));\n      extendCoordinate(tmpExtent, applyTransform(tmpTransform, p4));\n    } else {\n      createOrUpdate(boxX, boxY, boxX + boxW, boxY + boxH, tmpExtent);\n    }\n    const canvas = context.canvas;\n    const strokePadding = strokeInstruction ? (strokeInstruction[2] * scale / 2) : 0;\n    const intersects =\n        tmpExtent[0] - strokePadding <= canvas.width && tmpExtent[2] + strokePadding >= 0 &&\n        tmpExtent[1] - strokePadding <= canvas.height && tmpExtent[3] + strokePadding >= 0;\n\n    if (snapToPixel) {\n      x = Math.round(x);\n      y = Math.round(y);\n    }\n\n    if (declutterGroup) {\n      if (!intersects && declutterGroup[4] == 1) {\n        return;\n      }\n      extend(declutterGroup, tmpExtent);\n      const declutterArgs = intersects ?\n        [context, transform ? transform.slice(0) : null, opacity, image, originX, originY, w, h, x, y, scale] :\n        null;\n      if (declutterArgs && fillStroke) {\n        declutterArgs.push(fillInstruction, strokeInstruction, p1, p2, p3, p4);\n      }\n      declutterGroup.push(declutterArgs);\n    } else if (intersects) {\n      if (fillStroke) {\n        this.replayTextBackground_(context, p1, p2, p3, p4,\n          /** @type {Array<*>} */ (fillInstruction),\n          /** @type {Array<*>} */ (strokeInstruction));\n      }\n      drawImage(context, transform, opacity, image, originX, originY, w, h, x, y, scale);\n    }\n  }\n\n  /**\n   * @protected\n   * @param {Array<number>} dashArray Dash array.\n   * @return {Array<number>} Dash array with pixel ratio applied\n   */\n  applyPixelRatio(dashArray) {\n    const pixelRatio = this.pixelRatio;\n    return pixelRatio == 1 ? dashArray : dashArray.map(function(dash) {\n      return dash * pixelRatio;\n    });\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @param {boolean} closed Last input coordinate equals first.\n   * @param {boolean} skipFirst Skip first coordinate.\n   * @protected\n   * @return {number} My end.\n   */\n  appendFlatCoordinates(flatCoordinates, offset, end, stride, closed, skipFirst) {\n\n    let myEnd = this.coordinates.length;\n    const extent = this.getBufferedMaxExtent();\n    if (skipFirst) {\n      offset += stride;\n    }\n    const lastCoord = [flatCoordinates[offset], flatCoordinates[offset + 1]];\n    const nextCoord = [NaN, NaN];\n    let skipped = true;\n\n    let i, lastRel, nextRel;\n    for (i = offset + stride; i < end; i += stride) {\n      nextCoord[0] = flatCoordinates[i];\n      nextCoord[1] = flatCoordinates[i + 1];\n      nextRel = coordinateRelationship(extent, nextCoord);\n      if (nextRel !== lastRel) {\n        if (skipped) {\n          this.coordinates[myEnd++] = lastCoord[0];\n          this.coordinates[myEnd++] = lastCoord[1];\n        }\n        this.coordinates[myEnd++] = nextCoord[0];\n        this.coordinates[myEnd++] = nextCoord[1];\n        skipped = false;\n      } else if (nextRel === Relationship.INTERSECTING) {\n        this.coordinates[myEnd++] = nextCoord[0];\n        this.coordinates[myEnd++] = nextCoord[1];\n        skipped = false;\n      } else {\n        skipped = true;\n      }\n      lastCoord[0] = nextCoord[0];\n      lastCoord[1] = nextCoord[1];\n      lastRel = nextRel;\n    }\n\n    // Last coordinate equals first or only one point to append:\n    if ((closed && skipped) || i === offset + stride) {\n      this.coordinates[myEnd++] = lastCoord[0];\n      this.coordinates[myEnd++] = lastCoord[1];\n    }\n    return myEnd;\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {Array<number>} ends Ends.\n   * @param {number} stride Stride.\n   * @param {Array<number>} replayEnds Replay ends.\n   * @return {number} Offset.\n   */\n  drawCustomCoordinates_(flatCoordinates, offset, ends, stride, replayEnds) {\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      const end = ends[i];\n      const replayEnd = this.appendFlatCoordinates(flatCoordinates, offset, end, stride, false, false);\n      replayEnds.push(replayEnd);\n      offset = end;\n    }\n    return offset;\n  }\n\n  /**\n   * @inheritDoc.\n   */\n  drawCustom(geometry, feature, renderer) {\n    this.beginGeometry(geometry, feature);\n    const type = geometry.getType();\n    const stride = geometry.getStride();\n    const replayBegin = this.coordinates.length;\n    let flatCoordinates, replayEnd, replayEnds, replayEndss;\n    let offset;\n    if (type == GeometryType.MULTI_POLYGON) {\n      geometry = /** @type {import(\"../../geom/MultiPolygon.js\").default} */ (geometry);\n      flatCoordinates = geometry.getOrientedFlatCoordinates();\n      replayEndss = [];\n      const endss = geometry.getEndss();\n      offset = 0;\n      for (let i = 0, ii = endss.length; i < ii; ++i) {\n        const myEnds = [];\n        offset = this.drawCustomCoordinates_(flatCoordinates, offset, endss[i], stride, myEnds);\n        replayEndss.push(myEnds);\n      }\n      this.instructions.push([CanvasInstruction.CUSTOM,\n        replayBegin, replayEndss, geometry, renderer, inflateMultiCoordinatesArray]);\n    } else if (type == GeometryType.POLYGON || type == GeometryType.MULTI_LINE_STRING) {\n      replayEnds = [];\n      flatCoordinates = (type == GeometryType.POLYGON) ?\n        /** @type {import(\"../../geom/Polygon.js\").default} */ (geometry).getOrientedFlatCoordinates() :\n        geometry.getFlatCoordinates();\n      offset = this.drawCustomCoordinates_(flatCoordinates, 0,\n        /** @type {import(\"../../geom/Polygon.js\").default|import(\"../../geom/MultiLineString.js\").default} */ (geometry).getEnds(),\n        stride, replayEnds);\n      this.instructions.push([CanvasInstruction.CUSTOM,\n        replayBegin, replayEnds, geometry, renderer, inflateCoordinatesArray]);\n    } else if (type == GeometryType.LINE_STRING || type == GeometryType.MULTI_POINT) {\n      flatCoordinates = geometry.getFlatCoordinates();\n      replayEnd = this.appendFlatCoordinates(\n        flatCoordinates, 0, flatCoordinates.length, stride, false, false);\n      this.instructions.push([CanvasInstruction.CUSTOM,\n        replayBegin, replayEnd, geometry, renderer, inflateCoordinates]);\n    } else if (type == GeometryType.POINT) {\n      flatCoordinates = geometry.getFlatCoordinates();\n      this.coordinates.push(flatCoordinates[0], flatCoordinates[1]);\n      replayEnd = this.coordinates.length;\n      this.instructions.push([CanvasInstruction.CUSTOM,\n        replayBegin, replayEnd, geometry, renderer]);\n    }\n    this.endGeometry(geometry, feature);\n  }\n\n  /**\n   * @protected\n   * @param {import(\"../../geom/Geometry.js\").default|import(\"../Feature.js\").default} geometry Geometry.\n   * @param {import(\"../../Feature.js\").default|import(\"../Feature.js\").default} feature Feature.\n   */\n  beginGeometry(geometry, feature) {\n    this.beginGeometryInstruction1_ = [CanvasInstruction.BEGIN_GEOMETRY, feature, 0];\n    this.instructions.push(this.beginGeometryInstruction1_);\n    this.beginGeometryInstruction2_ = [CanvasInstruction.BEGIN_GEOMETRY, feature, 0];\n    this.hitDetectionInstructions.push(this.beginGeometryInstruction2_);\n  }\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  finish() {}\n\n  /**\n   * @private\n   * @param {CanvasRenderingContext2D} context Context.\n   */\n  fill_(context) {\n    if (this.alignFill_) {\n      const origin = applyTransform(this.renderedTransform_, [0, 0]);\n      const repeatSize = 512 * this.pixelRatio;\n      context.translate(origin[0] % repeatSize, origin[1] % repeatSize);\n      context.rotate(this.viewRotation_);\n    }\n    context.fill();\n    if (this.alignFill_) {\n      context.setTransform.apply(context, resetTransform);\n    }\n  }\n\n  /**\n   * @private\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {Array<*>} instruction Instruction.\n   */\n  setStrokeStyle_(context, instruction) {\n    context.strokeStyle = /** @type {import(\"../../colorlike.js\").ColorLike} */ (instruction[1]);\n    context.lineWidth = /** @type {number} */ (instruction[2]);\n    context.lineCap = /** @type {CanvasLineCap} */ (instruction[3]);\n    context.lineJoin = /** @type {CanvasLineJoin} */ (instruction[4]);\n    context.miterLimit = /** @type {number} */ (instruction[5]);\n    if (CANVAS_LINE_DASH) {\n      context.lineDashOffset = /** @type {number} */ (instruction[7]);\n      context.setLineDash(/** @type {Array<number>} */ (instruction[6]));\n    }\n  }\n\n  /**\n   * @param {import(\"../canvas.js\").DeclutterGroup} declutterGroup Declutter group.\n   * @param {import(\"../../Feature.js\").default|import(\"../Feature.js\").default} feature Feature.\n   */\n  renderDeclutter_(declutterGroup, feature) {\n    if (declutterGroup && declutterGroup.length > 5) {\n      const groupCount = declutterGroup[4];\n      if (groupCount == 1 || groupCount == declutterGroup.length - 5) {\n        /** @type {import(\"../../structs/RBush.js\").Entry} */\n        const box = {\n          minX: /** @type {number} */ (declutterGroup[0]),\n          minY: /** @type {number} */ (declutterGroup[1]),\n          maxX: /** @type {number} */ (declutterGroup[2]),\n          maxY: /** @type {number} */ (declutterGroup[3]),\n          value: feature\n        };\n        if (!this.declutterTree.collides(box)) {\n          this.declutterTree.insert(box);\n          for (let j = 5, jj = declutterGroup.length; j < jj; ++j) {\n            const declutterData = /** @type {Array} */ (declutterGroup[j]);\n            if (declutterData) {\n              if (declutterData.length > 11) {\n                this.replayTextBackground_(declutterData[0],\n                  declutterData[13], declutterData[14], declutterData[15], declutterData[16],\n                  declutterData[11], declutterData[12]);\n              }\n              drawImage.apply(undefined, declutterData);\n            }\n          }\n        }\n        declutterGroup.length = 5;\n        createOrUpdateEmpty(declutterGroup);\n      }\n    }\n  }\n\n  /**\n   * @private\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../transform.js\").Transform} transform Transform.\n   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features\n   *     to skip.\n   * @param {Array<*>} instructions Instructions array.\n   * @param {boolean} snapToPixel Snap point symbols and text to integer pixels.\n   * @param {function((import(\"../../Feature.js\").default|import(\"../Feature.js\").default)): T|undefined} featureCallback Feature callback.\n   * @param {import(\"../../extent.js\").Extent=} opt_hitExtent Only check features that intersect this\n   *     extent.\n   * @return {T|undefined} Callback result.\n   * @template T\n   */\n  replay_(\n    context,\n    transform,\n    skippedFeaturesHash,\n    instructions,\n    snapToPixel,\n    featureCallback,\n    opt_hitExtent\n  ) {\n    /** @type {Array<number>} */\n    let pixelCoordinates;\n    if (this.pixelCoordinates_ && equals(transform, this.renderedTransform_)) {\n      pixelCoordinates = this.pixelCoordinates_;\n    } else {\n      if (!this.pixelCoordinates_) {\n        this.pixelCoordinates_ = [];\n      }\n      pixelCoordinates = transform2D(\n        this.coordinates, 0, this.coordinates.length, 2,\n        transform, this.pixelCoordinates_);\n      transformSetFromArray(this.renderedTransform_, transform);\n    }\n    const skipFeatures = !isEmpty(skippedFeaturesHash);\n    let i = 0; // instruction index\n    const ii = instructions.length; // end of instructions\n    let d = 0; // data index\n    let dd; // end of per-instruction data\n    let anchorX, anchorY, prevX, prevY, roundX, roundY, declutterGroup, image;\n    let pendingFill = 0;\n    let pendingStroke = 0;\n    let lastFillInstruction = null;\n    let lastStrokeInstruction = null;\n    const coordinateCache = this.coordinateCache_;\n    const viewRotation = this.viewRotation_;\n\n    const state = /** @type {import(\"../../render.js\").State} */ ({\n      context: context,\n      pixelRatio: this.pixelRatio,\n      resolution: this.resolution,\n      rotation: viewRotation\n    });\n\n    // When the batch size gets too big, performance decreases. 200 is a good\n    // balance between batch size and number of fill/stroke instructions.\n    const batchSize = this.instructions != instructions || this.overlaps ? 0 : 200;\n    let /** @type {import(\"../../Feature.js\").default|import(\"../Feature.js\").default} */ feature;\n    let x, y;\n    while (i < ii) {\n      const instruction = instructions[i];\n      const type = /** @type {CanvasInstruction} */ (instruction[0]);\n      switch (type) {\n        case CanvasInstruction.BEGIN_GEOMETRY:\n          feature = /** @type {import(\"../../Feature.js\").default|import(\"../Feature.js\").default} */ (instruction[1]);\n          if ((skipFeatures && skippedFeaturesHash[getUid(feature)]) || !feature.getGeometry()) {\n            i = /** @type {number} */ (instruction[2]);\n          } else if (opt_hitExtent !== undefined && !intersects(\n            opt_hitExtent, feature.getGeometry().getExtent())) {\n            i = /** @type {number} */ (instruction[2]) + 1;\n          } else {\n            ++i;\n          }\n          break;\n        case CanvasInstruction.BEGIN_PATH:\n          if (pendingFill > batchSize) {\n            this.fill_(context);\n            pendingFill = 0;\n          }\n          if (pendingStroke > batchSize) {\n            context.stroke();\n            pendingStroke = 0;\n          }\n          if (!pendingFill && !pendingStroke) {\n            context.beginPath();\n            prevX = prevY = NaN;\n          }\n          ++i;\n          break;\n        case CanvasInstruction.CIRCLE:\n          d = /** @type {number} */ (instruction[1]);\n          const x1 = pixelCoordinates[d];\n          const y1 = pixelCoordinates[d + 1];\n          const x2 = pixelCoordinates[d + 2];\n          const y2 = pixelCoordinates[d + 3];\n          const dx = x2 - x1;\n          const dy = y2 - y1;\n          const r = Math.sqrt(dx * dx + dy * dy);\n          context.moveTo(x1 + r, y1);\n          context.arc(x1, y1, r, 0, 2 * Math.PI, true);\n          ++i;\n          break;\n        case CanvasInstruction.CLOSE_PATH:\n          context.closePath();\n          ++i;\n          break;\n        case CanvasInstruction.CUSTOM:\n          d = /** @type {number} */ (instruction[1]);\n          dd = instruction[2];\n          const geometry = /** @type {import(\"../../geom/SimpleGeometry.js\").default} */ (instruction[3]);\n          const renderer = instruction[4];\n          const fn = instruction.length == 6 ? instruction[5] : undefined;\n          state.geometry = geometry;\n          state.feature = feature;\n          if (!(i in coordinateCache)) {\n            coordinateCache[i] = [];\n          }\n          const coords = coordinateCache[i];\n          if (fn) {\n            fn(pixelCoordinates, d, dd, 2, coords);\n          } else {\n            coords[0] = pixelCoordinates[d];\n            coords[1] = pixelCoordinates[d + 1];\n            coords.length = 2;\n          }\n          renderer(coords, state);\n          ++i;\n          break;\n        case CanvasInstruction.DRAW_IMAGE:\n          d = /** @type {number} */ (instruction[1]);\n          dd = /** @type {number} */ (instruction[2]);\n          image = /** @type {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement} */\n              (instruction[3]);\n          // Remaining arguments in DRAW_IMAGE are in alphabetical order\n          anchorX = /** @type {number} */ (instruction[4]);\n          anchorY = /** @type {number} */ (instruction[5]);\n          declutterGroup = featureCallback ? null : /** @type {import(\"../canvas.js\").DeclutterGroup} */ (instruction[6]);\n          const height = /** @type {number} */ (instruction[7]);\n          const opacity = /** @type {number} */ (instruction[8]);\n          const originX = /** @type {number} */ (instruction[9]);\n          const originY = /** @type {number} */ (instruction[10]);\n          const rotateWithView = /** @type {boolean} */ (instruction[11]);\n          let rotation = /** @type {number} */ (instruction[12]);\n          const scale = /** @type {number} */ (instruction[13]);\n          const width = /** @type {number} */ (instruction[14]);\n\n          let padding, backgroundFill, backgroundStroke;\n          if (instruction.length > 16) {\n            padding = /** @type {Array<number>} */ (instruction[15]);\n            backgroundFill = /** @type {boolean} */ (instruction[16]);\n            backgroundStroke = /** @type {boolean} */ (instruction[17]);\n          } else {\n            padding = defaultPadding;\n            backgroundFill = backgroundStroke = false;\n          }\n\n          if (rotateWithView) {\n            rotation += viewRotation;\n          }\n          for (; d < dd; d += 2) {\n            this.replayImage_(context,\n              pixelCoordinates[d], pixelCoordinates[d + 1], image, anchorX, anchorY,\n              declutterGroup, height, opacity, originX, originY, rotation, scale,\n              snapToPixel, width, padding,\n              backgroundFill ? /** @type {Array<*>} */ (lastFillInstruction) : null,\n              backgroundStroke ? /** @type {Array<*>} */ (lastStrokeInstruction) : null);\n          }\n          this.renderDeclutter_(declutterGroup, feature);\n          ++i;\n          break;\n        case CanvasInstruction.DRAW_CHARS:\n          const begin = /** @type {number} */ (instruction[1]);\n          const end = /** @type {number} */ (instruction[2]);\n          const baseline = /** @type {number} */ (instruction[3]);\n          declutterGroup = featureCallback ? null : /** @type {import(\"../canvas.js\").DeclutterGroup} */ (instruction[4]);\n          const overflow = /** @type {number} */ (instruction[5]);\n          const fillKey = /** @type {string} */ (instruction[6]);\n          const maxAngle = /** @type {number} */ (instruction[7]);\n          const measure = /** @type {function(string):number} */ (instruction[8]);\n          const offsetY = /** @type {number} */ (instruction[9]);\n          const strokeKey = /** @type {string} */ (instruction[10]);\n          const strokeWidth = /** @type {number} */ (instruction[11]);\n          const text = /** @type {string} */ (instruction[12]);\n          const textKey = /** @type {string} */ (instruction[13]);\n          const textScale = /** @type {number} */ (instruction[14]);\n\n          const pathLength = lineStringLength(pixelCoordinates, begin, end, 2);\n          const textLength = measure(text);\n          if (overflow || textLength <= pathLength) {\n            /** @type {import(\"./TextReplay.js\").default} */\n            const textReplay = /** @type {?} */ (this);\n            const textAlign = textReplay.textStates[textKey].textAlign;\n            const startM = (pathLength - textLength) * TEXT_ALIGN[textAlign];\n            const parts = drawTextOnPath(\n              pixelCoordinates, begin, end, 2, text, measure, startM, maxAngle);\n            if (parts) {\n              let c, cc, chars, label, part;\n              if (strokeKey) {\n                for (c = 0, cc = parts.length; c < cc; ++c) {\n                  part = parts[c]; // x, y, anchorX, rotation, chunk\n                  chars = /** @type {string} */ (part[4]);\n                  label = textReplay.getImage(chars, textKey, '', strokeKey);\n                  anchorX = /** @type {number} */ (part[2]) + strokeWidth;\n                  anchorY = baseline * label.height + (0.5 - baseline) * 2 * strokeWidth - offsetY;\n                  this.replayImage_(context,\n                    /** @type {number} */ (part[0]), /** @type {number} */ (part[1]), label,\n                    anchorX, anchorY, declutterGroup, label.height, 1, 0, 0,\n                    /** @type {number} */ (part[3]), textScale, false, label.width,\n                    defaultPadding, null, null);\n                }\n              }\n              if (fillKey) {\n                for (c = 0, cc = parts.length; c < cc; ++c) {\n                  part = parts[c]; // x, y, anchorX, rotation, chunk\n                  chars = /** @type {string} */ (part[4]);\n                  label = textReplay.getImage(chars, textKey, fillKey, '');\n                  anchorX = /** @type {number} */ (part[2]);\n                  anchorY = baseline * label.height - offsetY;\n                  this.replayImage_(context,\n                    /** @type {number} */ (part[0]), /** @type {number} */ (part[1]), label,\n                    anchorX, anchorY, declutterGroup, label.height, 1, 0, 0,\n                    /** @type {number} */ (part[3]), textScale, false, label.width,\n                    defaultPadding, null, null);\n                }\n              }\n            }\n          }\n          this.renderDeclutter_(declutterGroup, feature);\n          ++i;\n          break;\n        case CanvasInstruction.END_GEOMETRY:\n          if (featureCallback !== undefined) {\n            feature = /** @type {import(\"../../Feature.js\").default|import(\"../Feature.js\").default} */ (instruction[1]);\n            const result = featureCallback(feature);\n            if (result) {\n              return result;\n            }\n          }\n          ++i;\n          break;\n        case CanvasInstruction.FILL:\n          if (batchSize) {\n            pendingFill++;\n          } else {\n            this.fill_(context);\n          }\n          ++i;\n          break;\n        case CanvasInstruction.MOVE_TO_LINE_TO:\n          d = /** @type {number} */ (instruction[1]);\n          dd = /** @type {number} */ (instruction[2]);\n          x = pixelCoordinates[d];\n          y = pixelCoordinates[d + 1];\n          roundX = (x + 0.5) | 0;\n          roundY = (y + 0.5) | 0;\n          if (roundX !== prevX || roundY !== prevY) {\n            context.moveTo(x, y);\n            prevX = roundX;\n            prevY = roundY;\n          }\n          for (d += 2; d < dd; d += 2) {\n            x = pixelCoordinates[d];\n            y = pixelCoordinates[d + 1];\n            roundX = (x + 0.5) | 0;\n            roundY = (y + 0.5) | 0;\n            if (d == dd - 2 || roundX !== prevX || roundY !== prevY) {\n              context.lineTo(x, y);\n              prevX = roundX;\n              prevY = roundY;\n            }\n          }\n          ++i;\n          break;\n        case CanvasInstruction.SET_FILL_STYLE:\n          lastFillInstruction = instruction;\n          this.alignFill_ = instruction[2];\n\n          if (pendingFill) {\n            this.fill_(context);\n            pendingFill = 0;\n            if (pendingStroke) {\n              context.stroke();\n              pendingStroke = 0;\n            }\n          }\n\n          context.fillStyle = /** @type {import(\"../../colorlike.js\").ColorLike} */ (instruction[1]);\n          ++i;\n          break;\n        case CanvasInstruction.SET_STROKE_STYLE:\n          lastStrokeInstruction = instruction;\n          if (pendingStroke) {\n            context.stroke();\n            pendingStroke = 0;\n          }\n          this.setStrokeStyle_(context, /** @type {Array<*>} */ (instruction));\n          ++i;\n          break;\n        case CanvasInstruction.STROKE:\n          if (batchSize) {\n            pendingStroke++;\n          } else {\n            context.stroke();\n          }\n          ++i;\n          break;\n        default:\n          ++i; // consume the instruction anyway, to avoid an infinite loop\n          break;\n      }\n    }\n    if (pendingFill) {\n      this.fill_(context);\n    }\n    if (pendingStroke) {\n      context.stroke();\n    }\n    return undefined;\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../transform.js\").Transform} transform Transform.\n   * @param {number} viewRotation View rotation.\n   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features\n   *     to skip.\n   * @param {boolean} snapToPixel Snap point symbols and text to integer pixels.\n   */\n  replay(context, transform, viewRotation, skippedFeaturesHash, snapToPixel) {\n    this.viewRotation_ = viewRotation;\n    this.replay_(context, transform,\n      skippedFeaturesHash, this.instructions, snapToPixel, undefined, undefined);\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../transform.js\").Transform} transform Transform.\n   * @param {number} viewRotation View rotation.\n   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features\n   *     to skip.\n   * @param {function((import(\"../../Feature.js\").default|import(\"../Feature.js\").default)): T=} opt_featureCallback\n   *     Feature callback.\n   * @param {import(\"../../extent.js\").Extent=} opt_hitExtent Only check features that intersect this\n   *     extent.\n   * @return {T|undefined} Callback result.\n   * @template T\n   */\n  replayHitDetection(\n    context,\n    transform,\n    viewRotation,\n    skippedFeaturesHash,\n    opt_featureCallback,\n    opt_hitExtent\n  ) {\n    this.viewRotation_ = viewRotation;\n    return this.replay_(context, transform, skippedFeaturesHash,\n      this.hitDetectionInstructions, true, opt_featureCallback, opt_hitExtent);\n  }\n\n  /**\n   * Reverse the hit detection instructions.\n   */\n  reverseHitDetectionInstructions() {\n    const hitDetectionInstructions = this.hitDetectionInstructions;\n    // step 1 - reverse array\n    hitDetectionInstructions.reverse();\n    // step 2 - reverse instructions within geometry blocks\n    let i;\n    const n = hitDetectionInstructions.length;\n    let instruction;\n    let type;\n    let begin = -1;\n    for (i = 0; i < n; ++i) {\n      instruction = hitDetectionInstructions[i];\n      type = /** @type {CanvasInstruction} */ (instruction[0]);\n      if (type == CanvasInstruction.END_GEOMETRY) {\n        begin = i;\n      } else if (type == CanvasInstruction.BEGIN_GEOMETRY) {\n        instruction[2] = i;\n        reverseSubArray(this.hitDetectionInstructions, begin, i);\n        begin = -1;\n      }\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setFillStrokeStyle(fillStyle, strokeStyle) {\n    const state = this.state;\n    if (fillStyle) {\n      const fillStyleColor = fillStyle.getColor();\n      state.fillStyle = asColorLike(fillStyleColor ?\n        fillStyleColor : defaultFillStyle);\n    } else {\n      state.fillStyle = undefined;\n    }\n    if (strokeStyle) {\n      const strokeStyleColor = strokeStyle.getColor();\n      state.strokeStyle = asColorLike(strokeStyleColor ?\n        strokeStyleColor : defaultStrokeStyle);\n      const strokeStyleLineCap = strokeStyle.getLineCap();\n      state.lineCap = strokeStyleLineCap !== undefined ?\n        strokeStyleLineCap : defaultLineCap;\n      const strokeStyleLineDash = strokeStyle.getLineDash();\n      state.lineDash = strokeStyleLineDash ?\n        strokeStyleLineDash.slice() : defaultLineDash;\n      const strokeStyleLineDashOffset = strokeStyle.getLineDashOffset();\n      state.lineDashOffset = strokeStyleLineDashOffset ?\n        strokeStyleLineDashOffset : defaultLineDashOffset;\n      const strokeStyleLineJoin = strokeStyle.getLineJoin();\n      state.lineJoin = strokeStyleLineJoin !== undefined ?\n        strokeStyleLineJoin : defaultLineJoin;\n      const strokeStyleWidth = strokeStyle.getWidth();\n      state.lineWidth = strokeStyleWidth !== undefined ?\n        strokeStyleWidth : defaultLineWidth;\n      const strokeStyleMiterLimit = strokeStyle.getMiterLimit();\n      state.miterLimit = strokeStyleMiterLimit !== undefined ?\n        strokeStyleMiterLimit : defaultMiterLimit;\n\n      if (state.lineWidth > this.maxLineWidth) {\n        this.maxLineWidth = state.lineWidth;\n        // invalidate the buffered max extent cache\n        this.bufferedMaxExtent_ = null;\n      }\n    } else {\n      state.strokeStyle = undefined;\n      state.lineCap = undefined;\n      state.lineDash = null;\n      state.lineDashOffset = undefined;\n      state.lineJoin = undefined;\n      state.lineWidth = undefined;\n      state.miterLimit = undefined;\n    }\n  }\n\n  /**\n   * @param {import(\"../canvas.js\").FillStrokeState} state State.\n   * @param {import(\"../../geom/Geometry.js\").default|import(\"../Feature.js\").default} geometry Geometry.\n   * @return {Array<*>} Fill instruction.\n   */\n  createFill(state, geometry) {\n    const fillStyle = state.fillStyle;\n    /** @type {Array<*>} */\n    const fillInstruction = [CanvasInstruction.SET_FILL_STYLE, fillStyle];\n    if (typeof fillStyle !== 'string') {\n      // Fill is a pattern or gradient - align it!\n      fillInstruction.push(true);\n    }\n    return fillInstruction;\n  }\n\n  /**\n   * @param {import(\"../canvas.js\").FillStrokeState} state State.\n   */\n  applyStroke(state) {\n    this.instructions.push(this.createStroke(state));\n  }\n\n  /**\n   * @param {import(\"../canvas.js\").FillStrokeState} state State.\n   * @return {Array<*>} Stroke instruction.\n   */\n  createStroke(state) {\n    return [\n      CanvasInstruction.SET_STROKE_STYLE,\n      state.strokeStyle, state.lineWidth * this.pixelRatio, state.lineCap,\n      state.lineJoin, state.miterLimit,\n      this.applyPixelRatio(state.lineDash), state.lineDashOffset * this.pixelRatio\n    ];\n  }\n\n  /**\n   * @param {import(\"../canvas.js\").FillStrokeState} state State.\n   * @param {function(this:CanvasReplay, import(\"../canvas.js\").FillStrokeState, (import(\"../../geom/Geometry.js\").default|import(\"../Feature.js\").default)):Array<*>} createFill Create fill.\n   * @param {import(\"../../geom/Geometry.js\").default|import(\"../Feature.js\").default} geometry Geometry.\n   */\n  updateFillStyle(state, createFill, geometry) {\n    const fillStyle = state.fillStyle;\n    if (typeof fillStyle !== 'string' || state.currentFillStyle != fillStyle) {\n      if (fillStyle !== undefined) {\n        this.instructions.push(createFill.call(this, state, geometry));\n      }\n      state.currentFillStyle = fillStyle;\n    }\n  }\n\n  /**\n   * @param {import(\"../canvas.js\").FillStrokeState} state State.\n   * @param {function(this:CanvasReplay, import(\"../canvas.js\").FillStrokeState)} applyStroke Apply stroke.\n   */\n  updateStrokeStyle(state, applyStroke) {\n    const strokeStyle = state.strokeStyle;\n    const lineCap = state.lineCap;\n    const lineDash = state.lineDash;\n    const lineDashOffset = state.lineDashOffset;\n    const lineJoin = state.lineJoin;\n    const lineWidth = state.lineWidth;\n    const miterLimit = state.miterLimit;\n    if (state.currentStrokeStyle != strokeStyle ||\n        state.currentLineCap != lineCap ||\n        (lineDash != state.currentLineDash && !equals(state.currentLineDash, lineDash)) ||\n        state.currentLineDashOffset != lineDashOffset ||\n        state.currentLineJoin != lineJoin ||\n        state.currentLineWidth != lineWidth ||\n        state.currentMiterLimit != miterLimit) {\n      if (strokeStyle !== undefined) {\n        applyStroke.call(this, state);\n      }\n      state.currentStrokeStyle = strokeStyle;\n      state.currentLineCap = lineCap;\n      state.currentLineDash = lineDash;\n      state.currentLineDashOffset = lineDashOffset;\n      state.currentLineJoin = lineJoin;\n      state.currentLineWidth = lineWidth;\n      state.currentMiterLimit = miterLimit;\n    }\n  }\n\n  /**\n   * @param {import(\"../../geom/Geometry.js\").default|import(\"../Feature.js\").default} geometry Geometry.\n   * @param {import(\"../../Feature.js\").default|import(\"../Feature.js\").default} feature Feature.\n   */\n  endGeometry(geometry, feature) {\n    this.beginGeometryInstruction1_[2] = this.instructions.length;\n    this.beginGeometryInstruction1_ = null;\n    this.beginGeometryInstruction2_[2] = this.hitDetectionInstructions.length;\n    this.beginGeometryInstruction2_ = null;\n    const endGeometryInstruction = [CanvasInstruction.END_GEOMETRY, feature];\n    this.instructions.push(endGeometryInstruction);\n    this.hitDetectionInstructions.push(endGeometryInstruction);\n  }\n\n  /**\n   * Get the buffered rendering extent.  Rendering will be clipped to the extent\n   * provided to the constructor.  To account for symbolizers that may intersect\n   * this extent, we calculate a buffered extent (e.g. based on stroke width).\n   * @return {import(\"../../extent.js\").Extent} The buffered rendering extent.\n   * @protected\n   */\n  getBufferedMaxExtent() {\n    if (!this.bufferedMaxExtent_) {\n      this.bufferedMaxExtent_ = clone(this.maxExtent);\n      if (this.maxLineWidth > 0) {\n        const width = this.resolution * (this.maxLineWidth + 1) / 2;\n        buffer(this.bufferedMaxExtent_, width, this.bufferedMaxExtent_);\n      }\n    }\n    return this.bufferedMaxExtent_;\n  }\n}\n\n\nexport default CanvasReplay;\n","/**\n * @module ol/render/canvas/ImageReplay\n */\nimport CanvasInstruction from './Instruction.js';\nimport CanvasReplay from './Replay.js';\n\nclass CanvasImageReplay extends CanvasReplay {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {import(\"../../extent.js\").Extent} maxExtent Maximum extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree.\n   */\n  constructor(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree) {\n    super(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree);\n\n    /**\n     * @private\n     * @type {import(\"../canvas.js\").DeclutterGroup}\n     */\n    this.declutterGroup_ = null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement}\n     */\n    this.hitDetectionImage_ = null;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement|HTMLVideoElement|HTMLImageElement}\n     */\n    this.image_ = null;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.anchorX_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.anchorY_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.height_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.opacity_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.originX_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.originY_ = undefined;\n\n    /**\n     * @private\n     * @type {boolean|undefined}\n     */\n    this.rotateWithView_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.rotation_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.scale_ = undefined;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.width_ = undefined;\n\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @private\n   * @return {number} My end.\n   */\n  drawCoordinates_(flatCoordinates, offset, end, stride) {\n    return this.appendFlatCoordinates(flatCoordinates, offset, end, stride, false, false);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawPoint(pointGeometry, feature) {\n    if (!this.image_) {\n      return;\n    }\n    this.beginGeometry(pointGeometry, feature);\n    const flatCoordinates = pointGeometry.getFlatCoordinates();\n    const stride = pointGeometry.getStride();\n    const myBegin = this.coordinates.length;\n    const myEnd = this.drawCoordinates_(flatCoordinates, 0, flatCoordinates.length, stride);\n    this.instructions.push([\n      CanvasInstruction.DRAW_IMAGE, myBegin, myEnd, this.image_,\n      // Remaining arguments to DRAW_IMAGE are in alphabetical order\n      this.anchorX_, this.anchorY_, this.declutterGroup_, this.height_, this.opacity_,\n      this.originX_, this.originY_, this.rotateWithView_, this.rotation_,\n      this.scale_ * this.pixelRatio, this.width_\n    ]);\n    this.hitDetectionInstructions.push([\n      CanvasInstruction.DRAW_IMAGE, myBegin, myEnd, this.hitDetectionImage_,\n      // Remaining arguments to DRAW_IMAGE are in alphabetical order\n      this.anchorX_, this.anchorY_, this.declutterGroup_, this.height_, this.opacity_,\n      this.originX_, this.originY_, this.rotateWithView_, this.rotation_,\n      this.scale_, this.width_\n    ]);\n    this.endGeometry(pointGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawMultiPoint(multiPointGeometry, feature) {\n    if (!this.image_) {\n      return;\n    }\n    this.beginGeometry(multiPointGeometry, feature);\n    const flatCoordinates = multiPointGeometry.getFlatCoordinates();\n    const stride = multiPointGeometry.getStride();\n    const myBegin = this.coordinates.length;\n    const myEnd = this.drawCoordinates_(\n      flatCoordinates, 0, flatCoordinates.length, stride);\n    this.instructions.push([\n      CanvasInstruction.DRAW_IMAGE, myBegin, myEnd, this.image_,\n      // Remaining arguments to DRAW_IMAGE are in alphabetical order\n      this.anchorX_, this.anchorY_, this.declutterGroup_, this.height_, this.opacity_,\n      this.originX_, this.originY_, this.rotateWithView_, this.rotation_,\n      this.scale_ * this.pixelRatio, this.width_\n    ]);\n    this.hitDetectionInstructions.push([\n      CanvasInstruction.DRAW_IMAGE, myBegin, myEnd, this.hitDetectionImage_,\n      // Remaining arguments to DRAW_IMAGE are in alphabetical order\n      this.anchorX_, this.anchorY_, this.declutterGroup_, this.height_, this.opacity_,\n      this.originX_, this.originY_, this.rotateWithView_, this.rotation_,\n      this.scale_, this.width_\n    ]);\n    this.endGeometry(multiPointGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  finish() {\n    this.reverseHitDetectionInstructions();\n    // FIXME this doesn't really protect us against further calls to draw*Geometry\n    this.anchorX_ = undefined;\n    this.anchorY_ = undefined;\n    this.hitDetectionImage_ = null;\n    this.image_ = null;\n    this.height_ = undefined;\n    this.scale_ = undefined;\n    this.opacity_ = undefined;\n    this.originX_ = undefined;\n    this.originY_ = undefined;\n    this.rotateWithView_ = undefined;\n    this.rotation_ = undefined;\n    this.width_ = undefined;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setImageStyle(imageStyle, declutterGroup) {\n    const anchor = imageStyle.getAnchor();\n    const size = imageStyle.getSize();\n    const hitDetectionImage = imageStyle.getHitDetectionImage(1);\n    const image = imageStyle.getImage(1);\n    const origin = imageStyle.getOrigin();\n    this.anchorX_ = anchor[0];\n    this.anchorY_ = anchor[1];\n    this.declutterGroup_ = /** @type {import(\"../canvas.js\").DeclutterGroup} */ (declutterGroup);\n    this.hitDetectionImage_ = hitDetectionImage;\n    this.image_ = image;\n    this.height_ = size[1];\n    this.opacity_ = imageStyle.getOpacity();\n    this.originX_ = origin[0];\n    this.originY_ = origin[1];\n    this.rotateWithView_ = imageStyle.getRotateWithView();\n    this.rotation_ = imageStyle.getRotation();\n    this.scale_ = imageStyle.getScale();\n    this.width_ = size[0];\n  }\n}\n\n\nexport default CanvasImageReplay;\n","/**\n * @module ol/render/canvas/LineStringReplay\n */\nimport CanvasInstruction, {strokeInstruction, beginPathInstruction} from './Instruction.js';\nimport CanvasReplay from './Replay.js';\n\nclass CanvasLineStringReplay extends CanvasReplay {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {import(\"../../extent.js\").Extent} maxExtent Maximum extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree.\n   */\n  constructor(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree) {\n    super(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree);\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {number} end End.\n   * @param {number} stride Stride.\n   * @private\n   * @return {number} end.\n   */\n  drawFlatCoordinates_(flatCoordinates, offset, end, stride) {\n    const myBegin = this.coordinates.length;\n    const myEnd = this.appendFlatCoordinates(\n      flatCoordinates, offset, end, stride, false, false);\n    const moveToLineToInstruction = [CanvasInstruction.MOVE_TO_LINE_TO, myBegin, myEnd];\n    this.instructions.push(moveToLineToInstruction);\n    this.hitDetectionInstructions.push(moveToLineToInstruction);\n    return end;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawLineString(lineStringGeometry, feature) {\n    const state = this.state;\n    const strokeStyle = state.strokeStyle;\n    const lineWidth = state.lineWidth;\n    if (strokeStyle === undefined || lineWidth === undefined) {\n      return;\n    }\n    this.updateStrokeStyle(state, this.applyStroke);\n    this.beginGeometry(lineStringGeometry, feature);\n    this.hitDetectionInstructions.push([\n      CanvasInstruction.SET_STROKE_STYLE,\n      state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,\n      state.miterLimit, state.lineDash, state.lineDashOffset\n    ], beginPathInstruction);\n    const flatCoordinates = lineStringGeometry.getFlatCoordinates();\n    const stride = lineStringGeometry.getStride();\n    this.drawFlatCoordinates_(flatCoordinates, 0, flatCoordinates.length, stride);\n    this.hitDetectionInstructions.push(strokeInstruction);\n    this.endGeometry(lineStringGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawMultiLineString(multiLineStringGeometry, feature) {\n    const state = this.state;\n    const strokeStyle = state.strokeStyle;\n    const lineWidth = state.lineWidth;\n    if (strokeStyle === undefined || lineWidth === undefined) {\n      return;\n    }\n    this.updateStrokeStyle(state, this.applyStroke);\n    this.beginGeometry(multiLineStringGeometry, feature);\n    this.hitDetectionInstructions.push([\n      CanvasInstruction.SET_STROKE_STYLE,\n      state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,\n      state.miterLimit, state.lineDash, state.lineDashOffset\n    ], beginPathInstruction);\n    const ends = multiLineStringGeometry.getEnds();\n    const flatCoordinates = multiLineStringGeometry.getFlatCoordinates();\n    const stride = multiLineStringGeometry.getStride();\n    let offset = 0;\n    for (let i = 0, ii = ends.length; i < ii; ++i) {\n      offset = this.drawFlatCoordinates_(flatCoordinates, offset, ends[i], stride);\n    }\n    this.hitDetectionInstructions.push(strokeInstruction);\n    this.endGeometry(multiLineStringGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  finish() {\n    const state = this.state;\n    if (state.lastStroke != undefined && state.lastStroke != this.coordinates.length) {\n      this.instructions.push(strokeInstruction);\n    }\n    this.reverseHitDetectionInstructions();\n    this.state = null;\n  }\n\n  /**\n   * @inheritDoc.\n   */\n  applyStroke(state) {\n    if (state.lastStroke != undefined && state.lastStroke != this.coordinates.length) {\n      this.instructions.push(strokeInstruction);\n      state.lastStroke = this.coordinates.length;\n    }\n    state.lastStroke = 0;\n    super.applyStroke(state);\n    this.instructions.push(beginPathInstruction);\n  }\n}\n\n\nexport default CanvasLineStringReplay;\n","/**\n * @module ol/render/canvas/PolygonReplay\n */\nimport {asString} from '../../color.js';\nimport {snap} from '../../geom/flat/simplify.js';\nimport {defaultFillStyle} from '../canvas.js';\nimport CanvasInstruction, {\n  fillInstruction, strokeInstruction, beginPathInstruction, closePathInstruction\n} from './Instruction.js';\nimport CanvasReplay from './Replay.js';\n\n\nclass CanvasPolygonReplay extends CanvasReplay {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {import(\"../../extent.js\").Extent} maxExtent Maximum extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree.\n   */\n  constructor(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree) {\n    super(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree);\n  }\n\n  /**\n   * @param {Array<number>} flatCoordinates Flat coordinates.\n   * @param {number} offset Offset.\n   * @param {Array<number>} ends Ends.\n   * @param {number} stride Stride.\n   * @private\n   * @return {number} End.\n   */\n  drawFlatCoordinatess_(flatCoordinates, offset, ends, stride) {\n    const state = this.state;\n    const fill = state.fillStyle !== undefined;\n    const stroke = state.strokeStyle != undefined;\n    const numEnds = ends.length;\n    this.instructions.push(beginPathInstruction);\n    this.hitDetectionInstructions.push(beginPathInstruction);\n    for (let i = 0; i < numEnds; ++i) {\n      const end = ends[i];\n      const myBegin = this.coordinates.length;\n      const myEnd = this.appendFlatCoordinates(flatCoordinates, offset, end, stride, true, !stroke);\n      const moveToLineToInstruction = [CanvasInstruction.MOVE_TO_LINE_TO, myBegin, myEnd];\n      this.instructions.push(moveToLineToInstruction);\n      this.hitDetectionInstructions.push(moveToLineToInstruction);\n      if (stroke) {\n        // Performance optimization: only call closePath() when we have a stroke.\n        // Otherwise the ring is closed already (see appendFlatCoordinates above).\n        this.instructions.push(closePathInstruction);\n        this.hitDetectionInstructions.push(closePathInstruction);\n      }\n      offset = end;\n    }\n    if (fill) {\n      this.instructions.push(fillInstruction);\n      this.hitDetectionInstructions.push(fillInstruction);\n    }\n    if (stroke) {\n      this.instructions.push(strokeInstruction);\n      this.hitDetectionInstructions.push(strokeInstruction);\n    }\n    return offset;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawCircle(circleGeometry, feature) {\n    const state = this.state;\n    const fillStyle = state.fillStyle;\n    const strokeStyle = state.strokeStyle;\n    if (fillStyle === undefined && strokeStyle === undefined) {\n      return;\n    }\n    this.setFillStrokeStyles_(circleGeometry);\n    this.beginGeometry(circleGeometry, feature);\n    if (state.fillStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_FILL_STYLE,\n        asString(defaultFillStyle)\n      ]);\n    }\n    if (state.strokeStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_STROKE_STYLE,\n        state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,\n        state.miterLimit, state.lineDash, state.lineDashOffset\n      ]);\n    }\n    const flatCoordinates = circleGeometry.getFlatCoordinates();\n    const stride = circleGeometry.getStride();\n    const myBegin = this.coordinates.length;\n    this.appendFlatCoordinates(\n      flatCoordinates, 0, flatCoordinates.length, stride, false, false);\n    const circleInstruction = [CanvasInstruction.CIRCLE, myBegin];\n    this.instructions.push(beginPathInstruction, circleInstruction);\n    this.hitDetectionInstructions.push(beginPathInstruction, circleInstruction);\n    this.hitDetectionInstructions.push(fillInstruction);\n    if (state.fillStyle !== undefined) {\n      this.instructions.push(fillInstruction);\n    }\n    if (state.strokeStyle !== undefined) {\n      this.instructions.push(strokeInstruction);\n      this.hitDetectionInstructions.push(strokeInstruction);\n    }\n    this.endGeometry(circleGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawPolygon(polygonGeometry, feature) {\n    const state = this.state;\n    const fillStyle = state.fillStyle;\n    const strokeStyle = state.strokeStyle;\n    if (fillStyle === undefined && strokeStyle === undefined) {\n      return;\n    }\n    this.setFillStrokeStyles_(polygonGeometry);\n    this.beginGeometry(polygonGeometry, feature);\n    if (state.fillStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_FILL_STYLE,\n        asString(defaultFillStyle)\n      ]);\n    }\n    if (state.strokeStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_STROKE_STYLE,\n        state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,\n        state.miterLimit, state.lineDash, state.lineDashOffset\n      ]);\n    }\n    const ends = polygonGeometry.getEnds();\n    const flatCoordinates = polygonGeometry.getOrientedFlatCoordinates();\n    const stride = polygonGeometry.getStride();\n    this.drawFlatCoordinatess_(flatCoordinates, 0, ends, stride);\n    this.endGeometry(polygonGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawMultiPolygon(multiPolygonGeometry, feature) {\n    const state = this.state;\n    const fillStyle = state.fillStyle;\n    const strokeStyle = state.strokeStyle;\n    if (fillStyle === undefined && strokeStyle === undefined) {\n      return;\n    }\n    this.setFillStrokeStyles_(multiPolygonGeometry);\n    this.beginGeometry(multiPolygonGeometry, feature);\n    if (state.fillStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_FILL_STYLE,\n        asString(defaultFillStyle)\n      ]);\n    }\n    if (state.strokeStyle !== undefined) {\n      this.hitDetectionInstructions.push([\n        CanvasInstruction.SET_STROKE_STYLE,\n        state.strokeStyle, state.lineWidth, state.lineCap, state.lineJoin,\n        state.miterLimit, state.lineDash, state.lineDashOffset\n      ]);\n    }\n    const endss = multiPolygonGeometry.getEndss();\n    const flatCoordinates = multiPolygonGeometry.getOrientedFlatCoordinates();\n    const stride = multiPolygonGeometry.getStride();\n    let offset = 0;\n    for (let i = 0, ii = endss.length; i < ii; ++i) {\n      offset = this.drawFlatCoordinatess_(flatCoordinates, offset, endss[i], stride);\n    }\n    this.endGeometry(multiPolygonGeometry, feature);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  finish() {\n    this.reverseHitDetectionInstructions();\n    this.state = null;\n    // We want to preserve topology when drawing polygons.  Polygons are\n    // simplified using quantization and point elimination. However, we might\n    // have received a mix of quantized and non-quantized geometries, so ensure\n    // that all are quantized by quantizing all coordinates in the batch.\n    const tolerance = this.tolerance;\n    if (tolerance !== 0) {\n      const coordinates = this.coordinates;\n      for (let i = 0, ii = coordinates.length; i < ii; ++i) {\n        coordinates[i] = snap(coordinates[i], tolerance);\n      }\n    }\n  }\n\n  /**\n   * @private\n   * @param {import(\"../../geom/Geometry.js\").default|import(\"../Feature.js\").default} geometry Geometry.\n   */\n  setFillStrokeStyles_(geometry) {\n    const state = this.state;\n    const fillStyle = state.fillStyle;\n    if (fillStyle !== undefined) {\n      this.updateFillStyle(state, this.createFill, geometry);\n    }\n    if (state.strokeStyle !== undefined) {\n      this.updateStrokeStyle(state, this.applyStroke);\n    }\n  }\n}\n\n\nexport default CanvasPolygonReplay;\n","/**\n * @module ol/geom/flat/straightchunk\n */\n\n\n/**\n * @param {number} maxAngle Maximum acceptable angle delta between segments.\n * @param {Array<number>} flatCoordinates Flat coordinates.\n * @param {number} offset Offset.\n * @param {number} end End.\n * @param {number} stride Stride.\n * @return {Array<number>} Start and end of the first suitable chunk of the\n * given `flatCoordinates`.\n */\nexport function matchingChunk(maxAngle, flatCoordinates, offset, end, stride) {\n  let chunkStart = offset;\n  let chunkEnd = offset;\n  let chunkM = 0;\n  let m = 0;\n  let start = offset;\n  let acos, i, m12, m23, x1, y1, x12, y12, x23, y23;\n  for (i = offset; i < end; i += stride) {\n    const x2 = flatCoordinates[i];\n    const y2 = flatCoordinates[i + 1];\n    if (x1 !== undefined) {\n      x23 = x2 - x1;\n      y23 = y2 - y1;\n      m23 = Math.sqrt(x23 * x23 + y23 * y23);\n      if (x12 !== undefined) {\n        m += m12;\n        acos = Math.acos((x12 * x23 + y12 * y23) / (m12 * m23));\n        if (acos > maxAngle) {\n          if (m > chunkM) {\n            chunkM = m;\n            chunkStart = start;\n            chunkEnd = i;\n          }\n          m = 0;\n          start = i - stride;\n        }\n      }\n      m12 = m23;\n      x12 = x23;\n      y12 = y23;\n    }\n    x1 = x2;\n    y1 = y2;\n  }\n  m += m23;\n  return m > chunkM ? [start, i] : [chunkStart, chunkEnd];\n}\n","/**\n * @module ol/style/TextPlacement\n */\n\n/**\n * Text placement. One of `'point'`, `'line'`. Default is `'point'`. Note that\n * `'line'` requires the underlying geometry to be a {@link module:ol/geom/LineString~LineString},\n * {@link module:ol/geom/Polygon~Polygon}, {@link module:ol/geom/MultiLineString~MultiLineString} or\n * {@link module:ol/geom/MultiPolygon~MultiPolygon}.\n * @enum {string}\n */\nexport default {\n  POINT: 'point',\n  LINE: 'line'\n};\n","/**\n * @module ol/render/canvas/TextReplay\n */\nimport {getUid} from '../../util.js';\nimport {asColorLike} from '../../colorlike.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {intersects} from '../../extent.js';\nimport {matchingChunk} from '../../geom/flat/straightchunk.js';\nimport GeometryType from '../../geom/GeometryType.js';\nimport {CANVAS_LINE_DASH} from '../../has.js';\nimport {labelCache, measureTextWidth, defaultTextAlign, measureTextHeight, defaultPadding, defaultLineCap, defaultLineDashOffset, defaultLineDash, defaultLineJoin, defaultFillStyle, checkFont, defaultFont, defaultLineWidth, defaultMiterLimit, defaultStrokeStyle, defaultTextBaseline} from '../canvas.js';\nimport CanvasInstruction from './Instruction.js';\nimport CanvasReplay from './Replay.js';\nimport {TEXT_ALIGN} from '../replay.js';\nimport TextPlacement from '../../style/TextPlacement.js';\n\nclass CanvasTextReplay extends CanvasReplay {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {import(\"../../extent.js\").Extent} maxExtent Maximum extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree.\n   */\n  constructor(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree) {\n    super(tolerance, maxExtent, resolution, pixelRatio, overlaps, declutterTree);\n\n    /**\n     * @private\n     * @type {import(\"../canvas.js\").DeclutterGroup}\n     */\n    this.declutterGroup_;\n\n    /**\n     * @private\n     * @type {Array<HTMLCanvasElement>}\n     */\n    this.labels_ = null;\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.text_ = '';\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textOffsetX_ = 0;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textOffsetY_ = 0;\n\n    /**\n     * @private\n     * @type {boolean|undefined}\n     */\n    this.textRotateWithView_ = undefined;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.textRotation_ = 0;\n\n    /**\n     * @private\n     * @type {?import(\"../canvas.js\").FillState}\n     */\n    this.textFillState_ = null;\n\n    /**\n     * @type {!Object<string, import(\"../canvas.js\").FillState>}\n     */\n    this.fillStates = {};\n\n    /**\n     * @private\n     * @type {?import(\"../canvas.js\").StrokeState}\n     */\n    this.textStrokeState_ = null;\n\n    /**\n     * @type {!Object<string, import(\"../canvas.js\").StrokeState>}\n     */\n    this.strokeStates = {};\n\n    /**\n     * @private\n     * @type {import(\"../canvas.js\").TextState}\n     */\n    this.textState_ = /** @type {import(\"../canvas.js\").TextState} */ ({});\n\n    /**\n     * @type {!Object<string, import(\"../canvas.js\").TextState>}\n     */\n    this.textStates = {};\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.textKey_ = '';\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.fillKey_ = '';\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.strokeKey_ = '';\n\n    /**\n     * @private\n     * @type {Object<string, Object<string, number>>}\n     */\n    this.widths_ = {};\n\n    labelCache.prune();\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  drawText(geometry, feature) {\n    const fillState = this.textFillState_;\n    const strokeState = this.textStrokeState_;\n    const textState = this.textState_;\n    if (this.text_ === '' || !textState || (!fillState && !strokeState)) {\n      return;\n    }\n\n    let begin = this.coordinates.length;\n\n    const geometryType = geometry.getType();\n    let flatCoordinates = null;\n    let end = 2;\n    let stride = 2;\n    let i, ii;\n\n    if (textState.placement === TextPlacement.LINE) {\n      if (!intersects(this.getBufferedMaxExtent(), geometry.getExtent())) {\n        return;\n      }\n      let ends;\n      flatCoordinates = geometry.getFlatCoordinates();\n      stride = geometry.getStride();\n      if (geometryType == GeometryType.LINE_STRING) {\n        ends = [flatCoordinates.length];\n      } else if (geometryType == GeometryType.MULTI_LINE_STRING) {\n        ends = geometry.getEnds();\n      } else if (geometryType == GeometryType.POLYGON) {\n        ends = geometry.getEnds().slice(0, 1);\n      } else if (geometryType == GeometryType.MULTI_POLYGON) {\n        const endss = geometry.getEndss();\n        ends = [];\n        for (i = 0, ii = endss.length; i < ii; ++i) {\n          ends.push(endss[i][0]);\n        }\n      }\n      this.beginGeometry(geometry, feature);\n      const textAlign = textState.textAlign;\n      let flatOffset = 0;\n      let flatEnd;\n      for (let o = 0, oo = ends.length; o < oo; ++o) {\n        if (textAlign == undefined) {\n          const range = matchingChunk(textState.maxAngle, flatCoordinates, flatOffset, ends[o], stride);\n          flatOffset = range[0];\n          flatEnd = range[1];\n        } else {\n          flatEnd = ends[o];\n        }\n        for (i = flatOffset; i < flatEnd; i += stride) {\n          this.coordinates.push(flatCoordinates[i], flatCoordinates[i + 1]);\n        }\n        end = this.coordinates.length;\n        flatOffset = ends[o];\n        this.drawChars_(begin, end, this.declutterGroup_);\n        begin = end;\n      }\n      this.endGeometry(geometry, feature);\n\n    } else {\n      const label = this.getImage(this.text_, this.textKey_, this.fillKey_, this.strokeKey_);\n      const width = label.width / this.pixelRatio;\n      switch (geometryType) {\n        case GeometryType.POINT:\n        case GeometryType.MULTI_POINT:\n          flatCoordinates = geometry.getFlatCoordinates();\n          end = flatCoordinates.length;\n          break;\n        case GeometryType.LINE_STRING:\n          flatCoordinates = /** @type {import(\"../../geom/LineString.js\").default} */ (geometry).getFlatMidpoint();\n          break;\n        case GeometryType.CIRCLE:\n          flatCoordinates = /** @type {import(\"../../geom/Circle.js\").default} */ (geometry).getCenter();\n          break;\n        case GeometryType.MULTI_LINE_STRING:\n          flatCoordinates = /** @type {import(\"../../geom/MultiLineString.js\").default} */ (geometry).getFlatMidpoints();\n          end = flatCoordinates.length;\n          break;\n        case GeometryType.POLYGON:\n          flatCoordinates = /** @type {import(\"../../geom/Polygon.js\").default} */ (geometry).getFlatInteriorPoint();\n          if (!textState.overflow && flatCoordinates[2] / this.resolution < width) {\n            return;\n          }\n          stride = 3;\n          break;\n        case GeometryType.MULTI_POLYGON:\n          const interiorPoints = /** @type {import(\"../../geom/MultiPolygon.js\").default} */ (geometry).getFlatInteriorPoints();\n          flatCoordinates = [];\n          for (i = 0, ii = interiorPoints.length; i < ii; i += 3) {\n            if (textState.overflow || interiorPoints[i + 2] / this.resolution >= width) {\n              flatCoordinates.push(interiorPoints[i], interiorPoints[i + 1]);\n            }\n          }\n          end = flatCoordinates.length;\n          if (end == 0) {\n            return;\n          }\n          break;\n        default:\n      }\n      end = this.appendFlatCoordinates(flatCoordinates, 0, end, stride, false, false);\n      if (textState.backgroundFill || textState.backgroundStroke) {\n        this.setFillStrokeStyle(textState.backgroundFill, textState.backgroundStroke);\n        if (textState.backgroundFill) {\n          this.updateFillStyle(this.state, this.createFill, geometry);\n          this.hitDetectionInstructions.push(this.createFill(this.state, geometry));\n        }\n        if (textState.backgroundStroke) {\n          this.updateStrokeStyle(this.state, this.applyStroke);\n          this.hitDetectionInstructions.push(this.createStroke(this.state));\n        }\n      }\n      this.beginGeometry(geometry, feature);\n      this.drawTextImage_(label, begin, end);\n      this.endGeometry(geometry, feature);\n    }\n  }\n\n  /**\n   * @param {string} text Text.\n   * @param {string} textKey Text style key.\n   * @param {string} fillKey Fill style key.\n   * @param {string} strokeKey Stroke style key.\n   * @return {HTMLCanvasElement} Image.\n   */\n  getImage(text, textKey, fillKey, strokeKey) {\n    let label;\n    const key = strokeKey + textKey + text + fillKey + this.pixelRatio;\n\n    if (!labelCache.containsKey(key)) {\n      const strokeState = strokeKey ? this.strokeStates[strokeKey] || this.textStrokeState_ : null;\n      const fillState = fillKey ? this.fillStates[fillKey] || this.textFillState_ : null;\n      const textState = this.textStates[textKey] || this.textState_;\n      const pixelRatio = this.pixelRatio;\n      const scale = textState.scale * pixelRatio;\n      const align = TEXT_ALIGN[textState.textAlign || defaultTextAlign];\n      const strokeWidth = strokeKey && strokeState.lineWidth ? strokeState.lineWidth : 0;\n\n      const lines = text.split('\\n');\n      const numLines = lines.length;\n      const widths = [];\n      const width = measureTextWidths(textState.font, lines, widths);\n      const lineHeight = measureTextHeight(textState.font);\n      const height = lineHeight * numLines;\n      const renderWidth = (width + strokeWidth);\n      const context = createCanvasContext2D(\n        Math.ceil(renderWidth * scale),\n        Math.ceil((height + strokeWidth) * scale));\n      label = context.canvas;\n      labelCache.set(key, label);\n      if (scale != 1) {\n        context.scale(scale, scale);\n      }\n      context.font = textState.font;\n      if (strokeKey) {\n        context.strokeStyle = strokeState.strokeStyle;\n        context.lineWidth = strokeWidth;\n        context.lineCap = /** @type {CanvasLineCap} */ (strokeState.lineCap);\n        context.lineJoin = /** @type {CanvasLineJoin} */ (strokeState.lineJoin);\n        context.miterLimit = strokeState.miterLimit;\n        if (CANVAS_LINE_DASH && strokeState.lineDash.length) {\n          context.setLineDash(strokeState.lineDash);\n          context.lineDashOffset = strokeState.lineDashOffset;\n        }\n      }\n      if (fillKey) {\n        context.fillStyle = fillState.fillStyle;\n      }\n      context.textBaseline = 'middle';\n      context.textAlign = 'center';\n      const leftRight = (0.5 - align);\n      const x = align * label.width / scale + leftRight * strokeWidth;\n      let i;\n      if (strokeKey) {\n        for (i = 0; i < numLines; ++i) {\n          context.strokeText(lines[i], x + leftRight * widths[i], 0.5 * (strokeWidth + lineHeight) + i * lineHeight);\n        }\n      }\n      if (fillKey) {\n        for (i = 0; i < numLines; ++i) {\n          context.fillText(lines[i], x + leftRight * widths[i], 0.5 * (strokeWidth + lineHeight) + i * lineHeight);\n        }\n      }\n    }\n    return labelCache.get(key);\n  }\n\n  /**\n   * @private\n   * @param {HTMLCanvasElement} label Label.\n   * @param {number} begin Begin.\n   * @param {number} end End.\n   */\n  drawTextImage_(label, begin, end) {\n    const textState = this.textState_;\n    const strokeState = this.textStrokeState_;\n    const pixelRatio = this.pixelRatio;\n    const align = TEXT_ALIGN[textState.textAlign || defaultTextAlign];\n    const baseline = TEXT_ALIGN[textState.textBaseline];\n    const strokeWidth = strokeState && strokeState.lineWidth ? strokeState.lineWidth : 0;\n\n    const anchorX = align * label.width / pixelRatio + 2 * (0.5 - align) * strokeWidth;\n    const anchorY = baseline * label.height / pixelRatio + 2 * (0.5 - baseline) * strokeWidth;\n    this.instructions.push([CanvasInstruction.DRAW_IMAGE, begin, end,\n      label, (anchorX - this.textOffsetX_) * pixelRatio, (anchorY - this.textOffsetY_) * pixelRatio,\n      this.declutterGroup_, label.height, 1, 0, 0, this.textRotateWithView_, this.textRotation_,\n      1, label.width,\n      textState.padding == defaultPadding ?\n        defaultPadding : textState.padding.map(function(p) {\n          return p * pixelRatio;\n        }),\n      !!textState.backgroundFill, !!textState.backgroundStroke\n    ]);\n    this.hitDetectionInstructions.push([CanvasInstruction.DRAW_IMAGE, begin, end,\n      label, (anchorX - this.textOffsetX_) * pixelRatio, (anchorY - this.textOffsetY_) * pixelRatio,\n      this.declutterGroup_, label.height, 1, 0, 0, this.textRotateWithView_, this.textRotation_,\n      1 / pixelRatio, label.width, textState.padding,\n      !!textState.backgroundFill, !!textState.backgroundStroke\n    ]);\n  }\n\n  /**\n   * @private\n   * @param {number} begin Begin.\n   * @param {number} end End.\n   * @param {import(\"../canvas.js\").DeclutterGroup} declutterGroup Declutter group.\n   */\n  drawChars_(begin, end, declutterGroup) {\n    const strokeState = this.textStrokeState_;\n    const textState = this.textState_;\n    const fillState = this.textFillState_;\n\n    const strokeKey = this.strokeKey_;\n    if (strokeState) {\n      if (!(strokeKey in this.strokeStates)) {\n        this.strokeStates[strokeKey] = /** @type {import(\"../canvas.js\").StrokeState} */ ({\n          strokeStyle: strokeState.strokeStyle,\n          lineCap: strokeState.lineCap,\n          lineDashOffset: strokeState.lineDashOffset,\n          lineWidth: strokeState.lineWidth,\n          lineJoin: strokeState.lineJoin,\n          miterLimit: strokeState.miterLimit,\n          lineDash: strokeState.lineDash\n        });\n      }\n    }\n    const textKey = this.textKey_;\n    if (!(this.textKey_ in this.textStates)) {\n      this.textStates[this.textKey_] = /** @type {import(\"../canvas.js\").TextState} */ ({\n        font: textState.font,\n        textAlign: textState.textAlign || defaultTextAlign,\n        scale: textState.scale\n      });\n    }\n    const fillKey = this.fillKey_;\n    if (fillState) {\n      if (!(fillKey in this.fillStates)) {\n        this.fillStates[fillKey] = /** @type {import(\"../canvas.js\").FillState} */ ({\n          fillStyle: fillState.fillStyle\n        });\n      }\n    }\n\n    const pixelRatio = this.pixelRatio;\n    const baseline = TEXT_ALIGN[textState.textBaseline];\n\n    const offsetY = this.textOffsetY_ * pixelRatio;\n    const text = this.text_;\n    const font = textState.font;\n    const textScale = textState.scale;\n    const strokeWidth = strokeState ? strokeState.lineWidth * textScale / 2 : 0;\n    let widths = this.widths_[font];\n    if (!widths) {\n      this.widths_[font] = widths = {};\n    }\n    this.instructions.push([CanvasInstruction.DRAW_CHARS,\n      begin, end, baseline, declutterGroup,\n      textState.overflow, fillKey, textState.maxAngle,\n      function(text) {\n        let width = widths[text];\n        if (!width) {\n          width = widths[text] = measureTextWidth(font, text);\n        }\n        return width * textScale * pixelRatio;\n      },\n      offsetY, strokeKey, strokeWidth * pixelRatio, text, textKey, 1\n    ]);\n    this.hitDetectionInstructions.push([CanvasInstruction.DRAW_CHARS,\n      begin, end, baseline, declutterGroup,\n      textState.overflow, fillKey, textState.maxAngle,\n      function(text) {\n        let width = widths[text];\n        if (!width) {\n          width = widths[text] = measureTextWidth(font, text);\n        }\n        return width * textScale;\n      },\n      offsetY, strokeKey, strokeWidth, text, textKey, 1 / pixelRatio\n    ]);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  setTextStyle(textStyle, declutterGroup) {\n    let textState, fillState, strokeState;\n    if (!textStyle) {\n      this.text_ = '';\n    } else {\n      this.declutterGroup_ = /** @type {import(\"../canvas.js\").DeclutterGroup} */ (declutterGroup);\n\n      const textFillStyle = textStyle.getFill();\n      if (!textFillStyle) {\n        fillState = this.textFillState_ = null;\n      } else {\n        fillState = this.textFillState_;\n        if (!fillState) {\n          fillState = this.textFillState_ = /** @type {import(\"../canvas.js\").FillState} */ ({});\n        }\n        fillState.fillStyle = asColorLike(\n          textFillStyle.getColor() || defaultFillStyle);\n      }\n\n      const textStrokeStyle = textStyle.getStroke();\n      if (!textStrokeStyle) {\n        strokeState = this.textStrokeState_ = null;\n      } else {\n        strokeState = this.textStrokeState_;\n        if (!strokeState) {\n          strokeState = this.textStrokeState_ = /** @type {import(\"../canvas.js\").StrokeState} */ ({});\n        }\n        const lineDash = textStrokeStyle.getLineDash();\n        const lineDashOffset = textStrokeStyle.getLineDashOffset();\n        const lineWidth = textStrokeStyle.getWidth();\n        const miterLimit = textStrokeStyle.getMiterLimit();\n        strokeState.lineCap = textStrokeStyle.getLineCap() || defaultLineCap;\n        strokeState.lineDash = lineDash ? lineDash.slice() : defaultLineDash;\n        strokeState.lineDashOffset =\n            lineDashOffset === undefined ? defaultLineDashOffset : lineDashOffset;\n        strokeState.lineJoin = textStrokeStyle.getLineJoin() || defaultLineJoin;\n        strokeState.lineWidth =\n            lineWidth === undefined ? defaultLineWidth : lineWidth;\n        strokeState.miterLimit =\n            miterLimit === undefined ? defaultMiterLimit : miterLimit;\n        strokeState.strokeStyle = asColorLike(\n          textStrokeStyle.getColor() || defaultStrokeStyle);\n      }\n\n      textState = this.textState_;\n      const font = textStyle.getFont() || defaultFont;\n      checkFont(font);\n      const textScale = textStyle.getScale();\n      textState.overflow = textStyle.getOverflow();\n      textState.font = font;\n      textState.maxAngle = textStyle.getMaxAngle();\n      textState.placement = textStyle.getPlacement();\n      textState.textAlign = textStyle.getTextAlign();\n      textState.textBaseline = textStyle.getTextBaseline() || defaultTextBaseline;\n      textState.backgroundFill = textStyle.getBackgroundFill();\n      textState.backgroundStroke = textStyle.getBackgroundStroke();\n      textState.padding = textStyle.getPadding() || defaultPadding;\n      textState.scale = textScale === undefined ? 1 : textScale;\n\n      const textOffsetX = textStyle.getOffsetX();\n      const textOffsetY = textStyle.getOffsetY();\n      const textRotateWithView = textStyle.getRotateWithView();\n      const textRotation = textStyle.getRotation();\n      this.text_ = textStyle.getText() || '';\n      this.textOffsetX_ = textOffsetX === undefined ? 0 : textOffsetX;\n      this.textOffsetY_ = textOffsetY === undefined ? 0 : textOffsetY;\n      this.textRotateWithView_ = textRotateWithView === undefined ? false : textRotateWithView;\n      this.textRotation_ = textRotation === undefined ? 0 : textRotation;\n\n      this.strokeKey_ = strokeState ?\n        (typeof strokeState.strokeStyle == 'string' ? strokeState.strokeStyle : getUid(strokeState.strokeStyle)) +\n        strokeState.lineCap + strokeState.lineDashOffset + '|' + strokeState.lineWidth +\n        strokeState.lineJoin + strokeState.miterLimit + '[' + strokeState.lineDash.join() + ']' :\n        '';\n      this.textKey_ = textState.font + textState.scale + (textState.textAlign || '?');\n      this.fillKey_ = fillState ?\n        (typeof fillState.fillStyle == 'string' ? fillState.fillStyle : ('|' + getUid(fillState.fillStyle))) :\n        '';\n    }\n  }\n}\n\n\n/**\n * @param {string} font Font to use for measuring.\n * @param {Array<string>} lines Lines to measure.\n * @param {Array<number>} widths Array will be populated with the widths of\n * each line.\n * @return {number} Width of the whole text.\n */\nexport function measureTextWidths(font, lines, widths) {\n  const numLines = lines.length;\n  let width = 0;\n  for (let i = 0; i < numLines; ++i) {\n    const currentWidth = measureTextWidth(font, lines[i]);\n    width = Math.max(width, currentWidth);\n    widths.push(currentWidth);\n  }\n  return width;\n}\n\n\nexport default CanvasTextReplay;\n","/**\n * @module ol/render/canvas/ReplayGroup\n */\n\nimport {numberSafeCompareFunction} from '../../array.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {buffer, createEmpty, extendCoordinate} from '../../extent.js';\nimport {transform2D} from '../../geom/flat/transform.js';\nimport {isEmpty} from '../../obj.js';\nimport ReplayGroup from '../ReplayGroup.js';\nimport ReplayType from '../ReplayType.js';\nimport CanvasReplay from './Replay.js';\nimport CanvasImageReplay from './ImageReplay.js';\nimport CanvasLineStringReplay from './LineStringReplay.js';\nimport CanvasPolygonReplay from './PolygonReplay.js';\nimport CanvasTextReplay from './TextReplay.js';\nimport {ORDER} from '../replay.js';\nimport {create as createTransform, compose as composeTransform} from '../../transform.js';\n\n\n/**\n * @type {Object<ReplayType, typeof CanvasReplay>}\n */\nconst BATCH_CONSTRUCTORS = {\n  'Circle': CanvasPolygonReplay,\n  'Default': CanvasReplay,\n  'Image': CanvasImageReplay,\n  'LineString': CanvasLineStringReplay,\n  'Polygon': CanvasPolygonReplay,\n  'Text': CanvasTextReplay\n};\n\n\nclass CanvasReplayGroup extends ReplayGroup {\n  /**\n   * @param {number} tolerance Tolerance.\n   * @param {import(\"../../extent.js\").Extent} maxExtent Max extent.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {boolean} overlaps The replay group can have overlapping geometries.\n   * @param {?} declutterTree Declutter tree for declutter processing in postrender.\n   * @param {number=} opt_renderBuffer Optional rendering buffer.\n   */\n  constructor(\n    tolerance,\n    maxExtent,\n    resolution,\n    pixelRatio,\n    overlaps,\n    declutterTree,\n    opt_renderBuffer\n  ) {\n    super();\n\n    /**\n     * Declutter tree.\n     * @private\n     */\n    this.declutterTree_ = declutterTree;\n\n    /**\n     * @type {import(\"../canvas.js\").DeclutterGroup}\n     * @private\n     */\n    this.declutterGroup_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.tolerance_ = tolerance;\n\n    /**\n     * @private\n     * @type {import(\"../../extent.js\").Extent}\n     */\n    this.maxExtent_ = maxExtent;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.overlaps_ = overlaps;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelRatio_ = pixelRatio;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.resolution_ = resolution;\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.renderBuffer_ = opt_renderBuffer;\n\n    /**\n     * @private\n     * @type {!Object<string, !Object<ReplayType, CanvasReplay>>}\n     */\n    this.replaysByZIndex_ = {};\n\n    /**\n     * @private\n     * @type {CanvasRenderingContext2D}\n     */\n    this.hitDetectionContext_ = createCanvasContext2D(1, 1);\n\n    /**\n     * @private\n     * @type {import(\"../../transform.js\").Transform}\n     */\n    this.hitDetectionTransform_ = createTransform();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  addDeclutter(group) {\n    let declutter = null;\n    if (this.declutterTree_) {\n      if (group) {\n        declutter = this.declutterGroup_;\n        /** @type {number} */ (declutter[4])++;\n      } else {\n        declutter = this.declutterGroup_ = createEmpty();\n        declutter.push(1);\n      }\n    }\n    return declutter;\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../transform.js\").Transform} transform Transform.\n   */\n  clip(context, transform) {\n    const flatClipCoords = this.getClipCoords(transform);\n    context.beginPath();\n    context.moveTo(flatClipCoords[0], flatClipCoords[1]);\n    context.lineTo(flatClipCoords[2], flatClipCoords[3]);\n    context.lineTo(flatClipCoords[4], flatClipCoords[5]);\n    context.lineTo(flatClipCoords[6], flatClipCoords[7]);\n    context.clip();\n  }\n\n  /**\n   * @param {Array<ReplayType>} replays Replays.\n   * @return {boolean} Has replays of the provided types.\n   */\n  hasReplays(replays) {\n    for (const zIndex in this.replaysByZIndex_) {\n      const candidates = this.replaysByZIndex_[zIndex];\n      for (let i = 0, ii = replays.length; i < ii; ++i) {\n        if (replays[i] in candidates) {\n          return true;\n        }\n      }\n    }\n    return false;\n  }\n\n  /**\n   * FIXME empty description for jsdoc\n   */\n  finish() {\n    for (const zKey in this.replaysByZIndex_) {\n      const replays = this.replaysByZIndex_[zKey];\n      for (const replayKey in replays) {\n        replays[replayKey].finish();\n      }\n    }\n  }\n\n  /**\n   * @param {import(\"../../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {number} resolution Resolution.\n   * @param {number} rotation Rotation.\n   * @param {number} hitTolerance Hit tolerance in pixels.\n   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features to skip.\n   * @param {function((import(\"../../Feature.js\").default|import(\"../Feature.js\").default)): T} callback Feature callback.\n   * @param {Object<string, import(\"../canvas.js\").DeclutterGroup>} declutterReplays Declutter replays.\n   * @return {T|undefined} Callback result.\n   * @template T\n   */\n  forEachFeatureAtCoordinate(\n    coordinate,\n    resolution,\n    rotation,\n    hitTolerance,\n    skippedFeaturesHash,\n    callback,\n    declutterReplays\n  ) {\n\n    hitTolerance = Math.round(hitTolerance);\n    const contextSize = hitTolerance * 2 + 1;\n    const transform = composeTransform(this.hitDetectionTransform_,\n      hitTolerance + 0.5, hitTolerance + 0.5,\n      1 / resolution, -1 / resolution,\n      -rotation,\n      -coordinate[0], -coordinate[1]);\n    const context = this.hitDetectionContext_;\n\n    if (context.canvas.width !== contextSize || context.canvas.height !== contextSize) {\n      context.canvas.width = contextSize;\n      context.canvas.height = contextSize;\n    } else {\n      context.clearRect(0, 0, contextSize, contextSize);\n    }\n\n    /**\n     * @type {import(\"../../extent.js\").Extent}\n     */\n    let hitExtent;\n    if (this.renderBuffer_ !== undefined) {\n      hitExtent = createEmpty();\n      extendCoordinate(hitExtent, coordinate);\n      buffer(hitExtent, resolution * (this.renderBuffer_ + hitTolerance), hitExtent);\n    }\n\n    const mask = getCircleArray(hitTolerance);\n    let declutteredFeatures;\n    if (this.declutterTree_) {\n      declutteredFeatures = this.declutterTree_.all().map(function(entry) {\n        return entry.value;\n      });\n    }\n\n    let replayType;\n\n    /**\n     * @param {import(\"../../Feature.js\").default|import(\"../Feature.js\").default} feature Feature.\n     * @return {?} Callback result.\n     */\n    function featureCallback(feature) {\n      const imageData = context.getImageData(0, 0, contextSize, contextSize).data;\n      for (let i = 0; i < contextSize; i++) {\n        for (let j = 0; j < contextSize; j++) {\n          if (mask[i][j]) {\n            if (imageData[(j * contextSize + i) * 4 + 3] > 0) {\n              let result;\n              if (!(declutteredFeatures && (replayType == ReplayType.IMAGE || replayType == ReplayType.TEXT)) ||\n                  declutteredFeatures.indexOf(feature) !== -1) {\n                result = callback(feature);\n              }\n              if (result) {\n                return result;\n              } else {\n                context.clearRect(0, 0, contextSize, contextSize);\n                return undefined;\n              }\n            }\n          }\n        }\n      }\n    }\n\n    /** @type {Array<number>} */\n    const zs = Object.keys(this.replaysByZIndex_).map(Number);\n    zs.sort(numberSafeCompareFunction);\n\n    let i, j, replays, replay, result;\n    for (i = zs.length - 1; i >= 0; --i) {\n      const zIndexKey = zs[i].toString();\n      replays = this.replaysByZIndex_[zIndexKey];\n      for (j = ORDER.length - 1; j >= 0; --j) {\n        replayType = ORDER[j];\n        replay = replays[replayType];\n        if (replay !== undefined) {\n          if (declutterReplays &&\n              (replayType == ReplayType.IMAGE || replayType == ReplayType.TEXT)) {\n            const declutter = declutterReplays[zIndexKey];\n            if (!declutter) {\n              declutterReplays[zIndexKey] = [replay, transform.slice(0)];\n            } else {\n              declutter.push(replay, transform.slice(0));\n            }\n          } else {\n            result = replay.replayHitDetection(context, transform, rotation,\n              skippedFeaturesHash, featureCallback, hitExtent);\n            if (result) {\n              return result;\n            }\n          }\n        }\n      }\n    }\n    return undefined;\n  }\n\n  /**\n   * @param {import(\"../../transform.js\").Transform} transform Transform.\n   * @return {Array<number>} Clip coordinates.\n   */\n  getClipCoords(transform) {\n    const maxExtent = this.maxExtent_;\n    const minX = maxExtent[0];\n    const minY = maxExtent[1];\n    const maxX = maxExtent[2];\n    const maxY = maxExtent[3];\n    const flatClipCoords = [minX, minY, minX, maxY, maxX, maxY, maxX, minY];\n    transform2D(\n      flatClipCoords, 0, 8, 2, transform, flatClipCoords);\n    return flatClipCoords;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getReplay(zIndex, replayType) {\n    const zIndexKey = zIndex !== undefined ? zIndex.toString() : '0';\n    let replays = this.replaysByZIndex_[zIndexKey];\n    if (replays === undefined) {\n      replays = {};\n      this.replaysByZIndex_[zIndexKey] = replays;\n    }\n    let replay = replays[replayType];\n    if (replay === undefined) {\n      const Constructor = BATCH_CONSTRUCTORS[replayType];\n      replay = new Constructor(this.tolerance_, this.maxExtent_,\n        this.resolution_, this.pixelRatio_, this.overlaps_, this.declutterTree_);\n      replays[replayType] = replay;\n    }\n    return replay;\n  }\n\n  /**\n   * @return {Object<string, Object<ReplayType, CanvasReplay>>} Replays.\n   */\n  getReplays() {\n    return this.replaysByZIndex_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  isEmpty() {\n    return isEmpty(this.replaysByZIndex_);\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../transform.js\").Transform} transform Transform.\n   * @param {number} viewRotation View rotation.\n   * @param {Object<string, boolean>} skippedFeaturesHash Ids of features to skip.\n   * @param {boolean} snapToPixel Snap point symbols and test to integer pixel.\n   * @param {Array<ReplayType>=} opt_replayTypes Ordered replay types to replay.\n   *     Default is {@link module:ol/render/replay~ORDER}\n   * @param {Object<string, import(\"../canvas.js\").DeclutterGroup>=} opt_declutterReplays Declutter replays.\n   */\n  replay(\n    context,\n    transform,\n    viewRotation,\n    skippedFeaturesHash,\n    snapToPixel,\n    opt_replayTypes,\n    opt_declutterReplays\n  ) {\n\n    /** @type {Array<number>} */\n    const zs = Object.keys(this.replaysByZIndex_).map(Number);\n    zs.sort(numberSafeCompareFunction);\n\n    // setup clipping so that the parts of over-simplified geometries are not\n    // visible outside the current extent when panning\n    context.save();\n    this.clip(context, transform);\n\n    const replayTypes = opt_replayTypes ? opt_replayTypes : ORDER;\n    let i, ii, j, jj, replays, replay;\n    for (i = 0, ii = zs.length; i < ii; ++i) {\n      const zIndexKey = zs[i].toString();\n      replays = this.replaysByZIndex_[zIndexKey];\n      for (j = 0, jj = replayTypes.length; j < jj; ++j) {\n        const replayType = replayTypes[j];\n        replay = replays[replayType];\n        if (replay !== undefined) {\n          if (opt_declutterReplays &&\n              (replayType == ReplayType.IMAGE || replayType == ReplayType.TEXT)) {\n            const declutter = opt_declutterReplays[zIndexKey];\n            if (!declutter) {\n              opt_declutterReplays[zIndexKey] = [replay, transform.slice(0)];\n            } else {\n              declutter.push(replay, transform.slice(0));\n            }\n          } else {\n            replay.replay(context, transform, viewRotation, skippedFeaturesHash, snapToPixel);\n          }\n        }\n      }\n    }\n\n    context.restore();\n  }\n}\n\n\n/**\n * This cache is used for storing calculated pixel circles for increasing performance.\n * It is a static property to allow each Replaygroup to access it.\n * @type {Object<number, Array<Array<(boolean|undefined)>>>}\n */\nconst circleArrayCache = {\n  0: [[true]]\n};\n\n\n/**\n * This method fills a row in the array from the given coordinate to the\n * middle with `true`.\n * @param {Array<Array<(boolean|undefined)>>} array The array that will be altered.\n * @param {number} x X coordinate.\n * @param {number} y Y coordinate.\n */\nfunction fillCircleArrayRowToMiddle(array, x, y) {\n  let i;\n  const radius = Math.floor(array.length / 2);\n  if (x >= radius) {\n    for (i = radius; i < x; i++) {\n      array[i][y] = true;\n    }\n  } else if (x < radius) {\n    for (i = x + 1; i < radius; i++) {\n      array[i][y] = true;\n    }\n  }\n}\n\n\n/**\n * This methods creates a circle inside a fitting array. Points inside the\n * circle are marked by true, points on the outside are undefined.\n * It uses the midpoint circle algorithm.\n * A cache is used to increase performance.\n * @param {number} radius Radius.\n * @returns {Array<Array<(boolean|undefined)>>} An array with marked circle points.\n */\nexport function getCircleArray(radius) {\n  if (circleArrayCache[radius] !== undefined) {\n    return circleArrayCache[radius];\n  }\n\n  const arraySize = radius * 2 + 1;\n  const arr = new Array(arraySize);\n  for (let i = 0; i < arraySize; i++) {\n    arr[i] = new Array(arraySize);\n  }\n\n  let x = radius;\n  let y = 0;\n  let error = 0;\n\n  while (x >= y) {\n    fillCircleArrayRowToMiddle(arr, radius + x, radius + y);\n    fillCircleArrayRowToMiddle(arr, radius + y, radius + x);\n    fillCircleArrayRowToMiddle(arr, radius - y, radius + x);\n    fillCircleArrayRowToMiddle(arr, radius - x, radius + y);\n    fillCircleArrayRowToMiddle(arr, radius - x, radius - y);\n    fillCircleArrayRowToMiddle(arr, radius - y, radius - x);\n    fillCircleArrayRowToMiddle(arr, radius + y, radius - x);\n    fillCircleArrayRowToMiddle(arr, radius + x, radius - y);\n\n    y++;\n    error += 1 + 2 * y;\n    if (2 * (error - x) + 1 > 0) {\n      x -= 1;\n      error += 1 - 2 * x;\n    }\n  }\n\n  circleArrayCache[radius] = arr;\n  return arr;\n}\n\n\n/**\n * @param {!Object<string, Array<*>>} declutterReplays Declutter replays.\n * @param {CanvasRenderingContext2D} context Context.\n * @param {number} rotation Rotation.\n * @param {boolean} snapToPixel Snap point symbols and text to integer pixels.\n */\nexport function replayDeclutter(declutterReplays, context, rotation, snapToPixel) {\n  const zs = Object.keys(declutterReplays).map(Number).sort(numberSafeCompareFunction);\n  const skippedFeatureUids = {};\n  for (let z = 0, zz = zs.length; z < zz; ++z) {\n    const replayData = declutterReplays[zs[z].toString()];\n    for (let i = 0, ii = replayData.length; i < ii;) {\n      const replay = replayData[i++];\n      const transform = replayData[i++];\n      replay.replay(context, transform, rotation, skippedFeatureUids, snapToPixel);\n    }\n  }\n}\n\n\nexport default CanvasReplayGroup;\n","/**\n * @module ol/renderer/vector\n */\nimport {getUid} from '../util.js';\nimport ImageState from '../ImageState.js';\nimport GeometryType from '../geom/GeometryType.js';\nimport ReplayType from '../render/ReplayType.js';\n\n\n/**\n * Tolerance for geometry simplification in device pixels.\n * @type {number}\n */\nconst SIMPLIFY_TOLERANCE = 0.5;\n\n\n/**\n * @const\n * @type {Object<import(\"../geom/GeometryType.js\").default,\n *                function(import(\"../render/ReplayGroup.js\").default, import(\"../geom/Geometry.js\").default,\n *                         import(\"../style/Style.js\").default, Object)>}\n */\nconst GEOMETRY_RENDERERS = {\n  'Point': renderPointGeometry,\n  'LineString': renderLineStringGeometry,\n  'Polygon': renderPolygonGeometry,\n  'MultiPoint': renderMultiPointGeometry,\n  'MultiLineString': renderMultiLineStringGeometry,\n  'MultiPolygon': renderMultiPolygonGeometry,\n  'GeometryCollection': renderGeometryCollectionGeometry,\n  'Circle': renderCircleGeometry\n};\n\n\n/**\n * @param {import(\"../Feature.js\").FeatureLike} feature1 Feature 1.\n * @param {import(\"../Feature.js\").FeatureLike} feature2 Feature 2.\n * @return {number} Order.\n */\nexport function defaultOrder(feature1, feature2) {\n  return parseInt(getUid(feature1), 10) - parseInt(getUid(feature2), 10);\n}\n\n\n/**\n * @param {number} resolution Resolution.\n * @param {number} pixelRatio Pixel ratio.\n * @return {number} Squared pixel tolerance.\n */\nexport function getSquaredTolerance(resolution, pixelRatio) {\n  const tolerance = getTolerance(resolution, pixelRatio);\n  return tolerance * tolerance;\n}\n\n\n/**\n * @param {number} resolution Resolution.\n * @param {number} pixelRatio Pixel ratio.\n * @return {number} Pixel tolerance.\n */\nexport function getTolerance(resolution, pixelRatio) {\n  return SIMPLIFY_TOLERANCE * resolution / pixelRatio;\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../geom/Circle.js\").default} geometry Geometry.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {import(\"../Feature.js\").default} feature Feature.\n */\nfunction renderCircleGeometry(replayGroup, geometry, style, feature) {\n  const fillStyle = style.getFill();\n  const strokeStyle = style.getStroke();\n  if (fillStyle || strokeStyle) {\n    const circleReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.CIRCLE);\n    circleReplay.setFillStrokeStyle(fillStyle, strokeStyle);\n    circleReplay.drawCircle(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(false));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {number} squaredTolerance Squared tolerance.\n * @param {function(this: T, import(\"../events/Event.js\").default)} listener Listener function.\n * @param {T} thisArg Value to use as `this` when executing `listener`.\n * @return {boolean} `true` if style is loading.\n * @template T\n */\nexport function renderFeature(replayGroup, feature, style, squaredTolerance, listener, thisArg) {\n  let loading = false;\n  const imageStyle = style.getImage();\n  if (imageStyle) {\n    let imageState = imageStyle.getImageState();\n    if (imageState == ImageState.LOADED || imageState == ImageState.ERROR) {\n      imageStyle.unlistenImageChange(listener, thisArg);\n    } else {\n      if (imageState == ImageState.IDLE) {\n        imageStyle.load();\n      }\n      imageState = imageStyle.getImageState();\n      imageStyle.listenImageChange(listener, thisArg);\n      loading = true;\n    }\n  }\n  renderFeatureInternal(replayGroup, feature, style, squaredTolerance);\n\n  return loading;\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {number} squaredTolerance Squared tolerance.\n */\nfunction renderFeatureInternal(replayGroup, feature, style, squaredTolerance) {\n  const geometry = style.getGeometryFunction()(feature);\n  if (!geometry) {\n    return;\n  }\n  const simplifiedGeometry = geometry.getSimplifiedGeometry(squaredTolerance);\n  const renderer = style.getRenderer();\n  if (renderer) {\n    renderGeometry(replayGroup, simplifiedGeometry, style, feature);\n  } else {\n    const geometryRenderer = GEOMETRY_RENDERERS[simplifiedGeometry.getType()];\n    geometryRenderer(replayGroup, simplifiedGeometry, style, feature);\n  }\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../geom/Geometry.js\").default|import(\"../render/Feature.js\").default} geometry Geometry.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n */\nfunction renderGeometry(replayGroup, geometry, style, feature) {\n  if (geometry.getType() == GeometryType.GEOMETRY_COLLECTION) {\n    const geometries = /** @type {import(\"../geom/GeometryCollection.js\").default} */ (geometry).getGeometries();\n    for (let i = 0, ii = geometries.length; i < ii; ++i) {\n      renderGeometry(replayGroup, geometries[i], style, feature);\n    }\n    return;\n  }\n  const replay = replayGroup.getReplay(style.getZIndex(), ReplayType.DEFAULT);\n  replay.drawCustom(/** @type {import(\"../geom/SimpleGeometry.js\").default} */ (geometry), feature, style.getRenderer());\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../geom/GeometryCollection.js\").default} geometry Geometry.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {import(\"../Feature.js\").default} feature Feature.\n */\nfunction renderGeometryCollectionGeometry(replayGroup, geometry, style, feature) {\n  const geometries = geometry.getGeometriesArray();\n  let i, ii;\n  for (i = 0, ii = geometries.length; i < ii; ++i) {\n    const geometryRenderer =\n        GEOMETRY_RENDERERS[geometries[i].getType()];\n    geometryRenderer(replayGroup, geometries[i], style, feature);\n  }\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../geom/LineString.js\").default|import(\"../render/Feature.js\").default} geometry Geometry.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n */\nfunction renderLineStringGeometry(replayGroup, geometry, style, feature) {\n  const strokeStyle = style.getStroke();\n  if (strokeStyle) {\n    const lineStringReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.LINE_STRING);\n    lineStringReplay.setFillStrokeStyle(null, strokeStyle);\n    lineStringReplay.drawLineString(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(false));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../geom/MultiLineString.js\").default|import(\"../render/Feature.js\").default} geometry Geometry.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n */\nfunction renderMultiLineStringGeometry(replayGroup, geometry, style, feature) {\n  const strokeStyle = style.getStroke();\n  if (strokeStyle) {\n    const lineStringReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.LINE_STRING);\n    lineStringReplay.setFillStrokeStyle(null, strokeStyle);\n    lineStringReplay.drawMultiLineString(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(false));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../geom/MultiPolygon.js\").default} geometry Geometry.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {import(\"../Feature.js\").default} feature Feature.\n */\nfunction renderMultiPolygonGeometry(replayGroup, geometry, style, feature) {\n  const fillStyle = style.getFill();\n  const strokeStyle = style.getStroke();\n  if (strokeStyle || fillStyle) {\n    const polygonReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.POLYGON);\n    polygonReplay.setFillStrokeStyle(fillStyle, strokeStyle);\n    polygonReplay.drawMultiPolygon(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(false));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../geom/Point.js\").default|import(\"../render/Feature.js\").default} geometry Geometry.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n */\nfunction renderPointGeometry(replayGroup, geometry, style, feature) {\n  const imageStyle = style.getImage();\n  if (imageStyle) {\n    if (imageStyle.getImageState() != ImageState.LOADED) {\n      return;\n    }\n    const imageReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.IMAGE);\n    imageReplay.setImageStyle(imageStyle, replayGroup.addDeclutter(false));\n    imageReplay.drawPoint(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(!!imageStyle));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../geom/MultiPoint.js\").default|import(\"../render/Feature.js\").default} geometry Geometry.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n */\nfunction renderMultiPointGeometry(replayGroup, geometry, style, feature) {\n  const imageStyle = style.getImage();\n  if (imageStyle) {\n    if (imageStyle.getImageState() != ImageState.LOADED) {\n      return;\n    }\n    const imageReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.IMAGE);\n    imageReplay.setImageStyle(imageStyle, replayGroup.addDeclutter(false));\n    imageReplay.drawMultiPoint(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(!!imageStyle));\n    textReplay.drawText(geometry, feature);\n  }\n}\n\n\n/**\n * @param {import(\"../render/ReplayGroup.js\").default} replayGroup Replay group.\n * @param {import(\"../geom/Polygon.js\").default|import(\"../render/Feature.js\").default} geometry Geometry.\n * @param {import(\"../style/Style.js\").default} style Style.\n * @param {import(\"../Feature.js\").FeatureLike} feature Feature.\n */\nfunction renderPolygonGeometry(replayGroup, geometry, style, feature) {\n  const fillStyle = style.getFill();\n  const strokeStyle = style.getStroke();\n  if (fillStyle || strokeStyle) {\n    const polygonReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.POLYGON);\n    polygonReplay.setFillStrokeStyle(fillStyle, strokeStyle);\n    polygonReplay.drawPolygon(geometry, feature);\n  }\n  const textStyle = style.getText();\n  if (textStyle) {\n    const textReplay = replayGroup.getReplay(style.getZIndex(), ReplayType.TEXT);\n    textReplay.setTextStyle(textStyle, replayGroup.addDeclutter(false));\n    textReplay.drawText(geometry, feature);\n  }\n}\n","/**\n * @module ol/renderer/canvas/VectorLayer\n */\nimport {getUid} from '../../util.js';\nimport LayerType from '../../LayerType.js';\nimport ViewHint from '../../ViewHint.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {listen, unlisten} from '../../events.js';\nimport EventType from '../../events/EventType.js';\nimport rbush from 'rbush';\nimport {buffer, createEmpty, containsExtent, getWidth} from '../../extent.js';\nimport RenderEventType from '../../render/EventType.js';\nimport {labelCache, rotateAtOffset} from '../../render/canvas.js';\nimport CanvasReplayGroup from '../../render/canvas/ReplayGroup.js';\nimport CanvasLayerRenderer from './Layer.js';\nimport {defaultOrder as defaultRenderOrder, getTolerance as getRenderTolerance, getSquaredTolerance as getSquaredRenderTolerance, renderFeature} from '../vector.js';\n\n/**\n * @classdesc\n * Canvas renderer for vector layers.\n * @api\n */\nclass CanvasVectorLayerRenderer extends CanvasLayerRenderer {\n\n  /**\n   * @param {import(\"../../layer/Vector.js\").default} vectorLayer Vector layer.\n   */\n  constructor(vectorLayer) {\n\n    super(vectorLayer);\n\n    /**\n     * Declutter tree.\n     * @private\n     */\n    this.declutterTree_ = vectorLayer.getDeclutter() ? rbush(9, undefined) : null;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.dirty_ = false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.renderedRevision_ = -1;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.renderedResolution_ = NaN;\n\n    /**\n     * @private\n     * @type {import(\"../../extent.js\").Extent}\n     */\n    this.renderedExtent_ = createEmpty();\n\n    /**\n     * @private\n     * @type {function(import(\"../../Feature.js\").default, import(\"../../Feature.js\").default): number|null}\n     */\n    this.renderedRenderOrder_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../../render/canvas/ReplayGroup.js\").default}\n     */\n    this.replayGroup_ = null;\n\n    /**\n     * A new replay group had to be created by `prepareFrame()`\n     * @type {boolean}\n     */\n    this.replayGroupChanged = true;\n\n    /**\n     * @type {CanvasRenderingContext2D}\n     */\n    this.context = createCanvasContext2D();\n\n    listen(labelCache, EventType.CLEAR, this.handleFontsChanged_, this);\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    unlisten(labelCache, EventType.CLEAR, this.handleFontsChanged_, this);\n    super.disposeInternal();\n  }\n\n  /**\n   * @param {CanvasRenderingContext2D} context Context.\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @param {import(\"../../layer/Layer.js\").State} layerState Layer state.\n   */\n  compose(context, frameState, layerState) {\n    const extent = frameState.extent;\n    const pixelRatio = frameState.pixelRatio;\n    const skippedFeatureUids = layerState.managed ?\n      frameState.skippedFeatureUids : {};\n    const viewState = frameState.viewState;\n    const projection = viewState.projection;\n    const rotation = viewState.rotation;\n    const projectionExtent = projection.getExtent();\n    const vectorSource = /** @type {import(\"../../source/Vector.js\").default} */ (this.getLayer().getSource());\n\n    let transform = this.getTransform(frameState, 0);\n\n    // clipped rendering if layer extent is set\n    const clipExtent = layerState.extent;\n    const clipped = clipExtent !== undefined;\n    if (clipped) {\n      this.clip(context, frameState, /** @type {import(\"../../extent.js\").Extent} */ (clipExtent));\n    }\n    const replayGroup = this.replayGroup_;\n    if (replayGroup && !replayGroup.isEmpty()) {\n      if (this.declutterTree_) {\n        this.declutterTree_.clear();\n      }\n      const layer = /** @type {import(\"../../layer/Vector.js\").default} */ (this.getLayer());\n      let drawOffsetX = 0;\n      let drawOffsetY = 0;\n      let replayContext;\n      const transparentLayer = layerState.opacity !== 1;\n      const hasRenderListeners = layer.hasListener(RenderEventType.RENDER);\n      if (transparentLayer || hasRenderListeners) {\n        let drawWidth = context.canvas.width;\n        let drawHeight = context.canvas.height;\n        if (rotation) {\n          const drawSize = Math.round(Math.sqrt(drawWidth * drawWidth + drawHeight * drawHeight));\n          drawOffsetX = (drawSize - drawWidth) / 2;\n          drawOffsetY = (drawSize - drawHeight) / 2;\n          drawWidth = drawHeight = drawSize;\n        }\n        // resize and clear\n        this.context.canvas.width = drawWidth;\n        this.context.canvas.height = drawHeight;\n        replayContext = this.context;\n      } else {\n        replayContext = context;\n      }\n\n      const alpha = replayContext.globalAlpha;\n      if (!transparentLayer) {\n        // for performance reasons, context.save / context.restore is not used\n        // to save and restore the transformation matrix and the opacity.\n        // see http://jsperf.com/context-save-restore-versus-variable\n        replayContext.globalAlpha = layerState.opacity;\n      }\n\n      if (replayContext != context) {\n        replayContext.translate(drawOffsetX, drawOffsetY);\n      }\n\n      const viewHints = frameState.viewHints;\n      const snapToPixel = !(viewHints[ViewHint.ANIMATING] || viewHints[ViewHint.INTERACTING]);\n      const width = frameState.size[0] * pixelRatio;\n      const height = frameState.size[1] * pixelRatio;\n      rotateAtOffset(replayContext, -rotation,\n        width / 2, height / 2);\n      replayGroup.replay(replayContext, transform, rotation, skippedFeatureUids, snapToPixel);\n      if (vectorSource.getWrapX() && projection.canWrapX() &&\n          !containsExtent(projectionExtent, extent)) {\n        let startX = extent[0];\n        const worldWidth = getWidth(projectionExtent);\n        let world = 0;\n        let offsetX;\n        while (startX < projectionExtent[0]) {\n          --world;\n          offsetX = worldWidth * world;\n          transform = this.getTransform(frameState, offsetX);\n          replayGroup.replay(replayContext, transform, rotation, skippedFeatureUids, snapToPixel);\n          startX += worldWidth;\n        }\n        world = 0;\n        startX = extent[2];\n        while (startX > projectionExtent[2]) {\n          ++world;\n          offsetX = worldWidth * world;\n          transform = this.getTransform(frameState, offsetX);\n          replayGroup.replay(replayContext, transform, rotation, skippedFeatureUids, snapToPixel);\n          startX -= worldWidth;\n        }\n      }\n      rotateAtOffset(replayContext, rotation,\n        width / 2, height / 2);\n\n      if (hasRenderListeners) {\n        this.dispatchRenderEvent(replayContext, frameState, transform);\n      }\n      if (replayContext != context) {\n        if (transparentLayer) {\n          const mainContextAlpha = context.globalAlpha;\n          context.globalAlpha = layerState.opacity;\n          context.drawImage(replayContext.canvas, -drawOffsetX, -drawOffsetY);\n          context.globalAlpha = mainContextAlpha;\n        } else {\n          context.drawImage(replayContext.canvas, -drawOffsetX, -drawOffsetY);\n        }\n        replayContext.translate(-drawOffsetX, -drawOffsetY);\n      }\n\n      if (!transparentLayer) {\n        replayContext.globalAlpha = alpha;\n      }\n    }\n\n    if (clipped) {\n      context.restore();\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  composeFrame(frameState, layerState, context) {\n    const transform = this.getTransform(frameState, 0);\n    this.preCompose(context, frameState, transform);\n    this.compose(context, frameState, layerState);\n    this.postCompose(context, frameState, layerState, transform);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {\n    if (!this.replayGroup_) {\n      return undefined;\n    } else {\n      const resolution = frameState.viewState.resolution;\n      const rotation = frameState.viewState.rotation;\n      const layer = /** @type {import(\"../../layer/Vector.js\").default} */ (this.getLayer());\n      /** @type {!Object<string, boolean>} */\n      const features = {};\n      const result = this.replayGroup_.forEachFeatureAtCoordinate(coordinate, resolution, rotation, hitTolerance, {},\n        /**\n         * @param {import(\"../../Feature.js\").FeatureLike} feature Feature.\n         * @return {?} Callback result.\n         */\n        function(feature) {\n          const key = getUid(feature);\n          if (!(key in features)) {\n            features[key] = true;\n            return callback.call(thisArg, feature, layer);\n          }\n        }, null);\n      return result;\n    }\n  }\n\n  /**\n   * @param {import(\"../../events/Event.js\").default} event Event.\n   */\n  handleFontsChanged_(event) {\n    const layer = this.getLayer();\n    if (layer.getVisible() && this.replayGroup_) {\n      layer.changed();\n    }\n  }\n\n  /**\n   * Handle changes in image style state.\n   * @param {import(\"../../events/Event.js\").default} event Image style change event.\n   * @private\n   */\n  handleStyleImageChange_(event) {\n    this.renderIfReadyAndVisible();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  prepareFrame(frameState, layerState) {\n    const vectorLayer = /** @type {import(\"../../layer/Vector.js\").default} */ (this.getLayer());\n    const vectorSource = /** @type {import(\"../../source/Vector.js\").default} */ (vectorLayer.getSource());\n\n    const animating = frameState.viewHints[ViewHint.ANIMATING];\n    const interacting = frameState.viewHints[ViewHint.INTERACTING];\n    const updateWhileAnimating = vectorLayer.getUpdateWhileAnimating();\n    const updateWhileInteracting = vectorLayer.getUpdateWhileInteracting();\n\n    if (!this.dirty_ && (!updateWhileAnimating && animating) ||\n        (!updateWhileInteracting && interacting)) {\n      return true;\n    }\n\n    const frameStateExtent = frameState.extent;\n    const viewState = frameState.viewState;\n    const projection = viewState.projection;\n    const resolution = viewState.resolution;\n    const pixelRatio = frameState.pixelRatio;\n    const vectorLayerRevision = vectorLayer.getRevision();\n    const vectorLayerRenderBuffer = vectorLayer.getRenderBuffer();\n    let vectorLayerRenderOrder = vectorLayer.getRenderOrder();\n\n    if (vectorLayerRenderOrder === undefined) {\n      vectorLayerRenderOrder = defaultRenderOrder;\n    }\n\n    const extent = buffer(frameStateExtent,\n      vectorLayerRenderBuffer * resolution);\n    const projectionExtent = viewState.projection.getExtent();\n\n    if (vectorSource.getWrapX() && viewState.projection.canWrapX() &&\n        !containsExtent(projectionExtent, frameState.extent)) {\n      // For the replay group, we need an extent that intersects the real world\n      // (-180° to +180°). To support geometries in a coordinate range from -540°\n      // to +540°, we add at least 1 world width on each side of the projection\n      // extent. If the viewport is wider than the world, we need to add half of\n      // the viewport width to make sure we cover the whole viewport.\n      const worldWidth = getWidth(projectionExtent);\n      const gutter = Math.max(getWidth(extent) / 2, worldWidth);\n      extent[0] = projectionExtent[0] - gutter;\n      extent[2] = projectionExtent[2] + gutter;\n    }\n\n    if (!this.dirty_ &&\n        this.renderedResolution_ == resolution &&\n        this.renderedRevision_ == vectorLayerRevision &&\n        this.renderedRenderOrder_ == vectorLayerRenderOrder &&\n        containsExtent(this.renderedExtent_, extent)) {\n      this.replayGroupChanged = false;\n      return true;\n    }\n\n    this.replayGroup_ = null;\n\n    this.dirty_ = false;\n\n    const replayGroup = new CanvasReplayGroup(\n      getRenderTolerance(resolution, pixelRatio), extent, resolution,\n      pixelRatio, vectorSource.getOverlaps(), this.declutterTree_, vectorLayer.getRenderBuffer());\n    vectorSource.loadFeatures(extent, resolution, projection);\n    /**\n     * @param {import(\"../../Feature.js\").default} feature Feature.\n     * @this {CanvasVectorLayerRenderer}\n     */\n    const render = function(feature) {\n      let styles;\n      const styleFunction = feature.getStyleFunction() || vectorLayer.getStyleFunction();\n      if (styleFunction) {\n        styles = styleFunction(feature, resolution);\n      }\n      if (styles) {\n        const dirty = this.renderFeature(\n          feature, resolution, pixelRatio, styles, replayGroup);\n        this.dirty_ = this.dirty_ || dirty;\n      }\n    }.bind(this);\n    if (vectorLayerRenderOrder) {\n      /** @type {Array<import(\"../../Feature.js\").default>} */\n      const features = [];\n      vectorSource.forEachFeatureInExtent(extent,\n        /**\n         * @param {import(\"../../Feature.js\").default} feature Feature.\n         */\n        function(feature) {\n          features.push(feature);\n        });\n      features.sort(vectorLayerRenderOrder);\n      for (let i = 0, ii = features.length; i < ii; ++i) {\n        render(features[i]);\n      }\n    } else {\n      vectorSource.forEachFeatureInExtent(extent, render);\n    }\n    replayGroup.finish();\n\n    this.renderedResolution_ = resolution;\n    this.renderedRevision_ = vectorLayerRevision;\n    this.renderedRenderOrder_ = vectorLayerRenderOrder;\n    this.renderedExtent_ = extent;\n    this.replayGroup_ = replayGroup;\n\n    this.replayGroupChanged = true;\n    return true;\n  }\n\n  /**\n   * @param {import(\"../../Feature.js\").default} feature Feature.\n   * @param {number} resolution Resolution.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"../../style/Style.js\").default|Array<import(\"../../style/Style.js\").default>} styles The style or array of styles.\n   * @param {import(\"../../render/canvas/ReplayGroup.js\").default} replayGroup Replay group.\n   * @return {boolean} `true` if an image is loading.\n   */\n  renderFeature(feature, resolution, pixelRatio, styles, replayGroup) {\n    if (!styles) {\n      return false;\n    }\n    let loading = false;\n    if (Array.isArray(styles)) {\n      for (let i = 0, ii = styles.length; i < ii; ++i) {\n        loading = renderFeature(\n          replayGroup, feature, styles[i],\n          getSquaredRenderTolerance(resolution, pixelRatio),\n          this.handleStyleImageChange_, this) || loading;\n      }\n    } else {\n      loading = renderFeature(\n        replayGroup, feature, styles,\n        getSquaredRenderTolerance(resolution, pixelRatio),\n        this.handleStyleImageChange_, this);\n    }\n    return loading;\n  }\n}\n\n\n/**\n * Determine if this renderer handles the provided layer.\n * @param {import(\"../../layer/Layer.js\").default} layer The candidate layer.\n * @return {boolean} The renderer can render the layer.\n */\nCanvasVectorLayerRenderer['handles'] = function(layer) {\n  return layer.getType() === LayerType.VECTOR;\n};\n\n\n/**\n * Create a layer renderer.\n * @param {import(\"../Map.js\").default} mapRenderer The map renderer.\n * @param {import(\"../../layer/Layer.js\").default} layer The layer to be rendererd.\n * @return {CanvasVectorLayerRenderer} The layer renderer.\n */\nCanvasVectorLayerRenderer['create'] = function(mapRenderer, layer) {\n  return new CanvasVectorLayerRenderer(/** @type {import(\"../../layer/Vector.js\").default} */ (layer));\n};\n\n\nexport default CanvasVectorLayerRenderer;\n","/**\n * @module ol/layer/VectorTileRenderType\n */\n\n/**\n * @enum {string}\n * Render mode for vector tiles:\n *  * `'image'`: Vector tiles are rendered as images. Great performance, but\n *    point symbols and texts are always rotated with the view and pixels are\n *    scaled during zoom animations.\n *  * `'hybrid'`: Polygon and line elements are rendered as images, so pixels\n *    are scaled during zoom animations. Point symbols and texts are accurately\n *    rendered as vectors and can stay upright on rotated views.\n *  * `'vector'`: Vector tiles are rendered as vectors. Most accurate rendering\n *    even during animations, but slower performance than the other options.\n * @api\n */\nexport default {\n  IMAGE: 'image',\n  HYBRID: 'hybrid',\n  VECTOR: 'vector'\n};\n","/**\n * @module ol/renderer/canvas/VectorTileLayer\n */\nimport {getUid} from '../../util.js';\nimport LayerType from '../../LayerType.js';\nimport TileState from '../../TileState.js';\nimport ViewHint from '../../ViewHint.js';\nimport {createCanvasContext2D} from '../../dom.js';\nimport {listen, unlisten} from '../../events.js';\nimport EventType from '../../events/EventType.js';\nimport rbush from 'rbush';\nimport {buffer, containsCoordinate, equals, getIntersection, getTopLeft, intersects} from '../../extent.js';\nimport VectorTileRenderType from '../../layer/VectorTileRenderType.js';\nimport {equivalent as equivalentProjection} from '../../proj.js';\nimport Units from '../../proj/Units.js';\nimport ReplayType from '../../render/ReplayType.js';\nimport {labelCache, rotateAtOffset} from '../../render/canvas.js';\nimport CanvasReplayGroup, {replayDeclutter} from '../../render/canvas/ReplayGroup.js';\nimport {ORDER} from '../../render/replay.js';\nimport CanvasTileLayerRenderer from './TileLayer.js';\nimport {getSquaredTolerance as getSquaredRenderTolerance, renderFeature} from '../vector.js';\nimport {\n  create as createTransform,\n  compose as composeTransform,\n  reset as resetTransform,\n  scale as scaleTransform,\n  translate as translateTransform\n} from '../../transform.js';\n\n\n/**\n * @type {!Object<string, Array<import(\"../../render/ReplayType.js\").default>>}\n */\nconst IMAGE_REPLAYS = {\n  'image': [ReplayType.POLYGON, ReplayType.CIRCLE,\n    ReplayType.LINE_STRING, ReplayType.IMAGE, ReplayType.TEXT],\n  'hybrid': [ReplayType.POLYGON, ReplayType.LINE_STRING]\n};\n\n\n/**\n * @type {!Object<string, Array<import(\"../../render/ReplayType.js\").default>>}\n */\nconst VECTOR_REPLAYS = {\n  'image': [ReplayType.DEFAULT],\n  'hybrid': [ReplayType.IMAGE, ReplayType.TEXT, ReplayType.DEFAULT],\n  'vector': ORDER\n};\n\n\n/**\n * @classdesc\n * Canvas renderer for vector tile layers.\n * @api\n */\nclass CanvasVectorTileLayerRenderer extends CanvasTileLayerRenderer {\n\n  /**\n   * @param {import(\"../../layer/VectorTile.js\").default} layer VectorTile layer.\n   */\n  constructor(layer) {\n\n    super(layer, true);\n\n    /**\n     * Declutter tree.\n     * @private\n     */\n    this.declutterTree_ = layer.getDeclutter() ? rbush(9, undefined) : null;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.dirty_ = false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.renderedLayerRevision_;\n\n    /**\n     * @private\n     * @type {import(\"../../transform.js\").Transform}\n     */\n    this.tmpTransform_ = createTransform();\n\n    const renderMode = layer.getRenderMode();\n\n    // Use lower resolution for pure vector rendering. Closest resolution otherwise.\n    this.zDirection = renderMode === VectorTileRenderType.VECTOR ? 1 : 0;\n\n    if (renderMode !== VectorTileRenderType.VECTOR) {\n      this.context = createCanvasContext2D();\n    }\n\n\n    listen(labelCache, EventType.CLEAR, this.handleFontsChanged_, this);\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    unlisten(labelCache, EventType.CLEAR, this.handleFontsChanged_, this);\n    super.disposeInternal();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTile(z, x, y, pixelRatio, projection) {\n    const tile = super.getTile(z, x, y, pixelRatio, projection);\n    if (tile.getState() === TileState.LOADED) {\n      this.createReplayGroup_(/** @type {import(\"../../VectorImageTile.js\").default} */ (tile), pixelRatio, projection);\n      if (this.context) {\n        this.renderTileImage_(/** @type {import(\"../../VectorImageTile.js\").default} */ (tile), pixelRatio, projection);\n      }\n    }\n    return tile;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTileImage(tile) {\n    const tileLayer = /** @type {import(\"../../layer/Tile.js\").default} */ (this.getLayer());\n    return /** @type {import(\"../../VectorImageTile.js\").default} */ (tile).getImage(tileLayer);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  prepareFrame(frameState, layerState) {\n    const layer = /** @type {import(\"../../layer/Vector.js\").default} */ (this.getLayer());\n    const layerRevision = layer.getRevision();\n    if (this.renderedLayerRevision_ != layerRevision) {\n      this.renderedTiles.length = 0;\n    }\n    this.renderedLayerRevision_ = layerRevision;\n    return super.prepareFrame(frameState, layerState);\n  }\n\n  /**\n   * @param {import(\"../../VectorImageTile.js\").default} tile Tile.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"../../proj/Projection.js\").default} projection Projection.\n   * @private\n   */\n  createReplayGroup_(tile, pixelRatio, projection) {\n    const layer = /** @type {import(\"../../layer/Vector.js\").default} */ (this.getLayer());\n    const revision = layer.getRevision();\n    const renderOrder = /** @type {import(\"../../render.js\").OrderFunction} */ (layer.getRenderOrder()) || null;\n\n    const replayState = tile.getReplayState(layer);\n    if (!replayState.dirty && replayState.renderedRevision == revision &&\n        replayState.renderedRenderOrder == renderOrder) {\n      return;\n    }\n\n    const source = /** @type {import(\"../../source/VectorTile.js\").default} */ (layer.getSource());\n    const sourceTileGrid = source.getTileGrid();\n    const tileGrid = source.getTileGridForProjection(projection);\n    const resolution = tileGrid.getResolution(tile.tileCoord[0]);\n    const tileExtent = tile.extent;\n\n    for (let t = 0, tt = tile.tileKeys.length; t < tt; ++t) {\n      const sourceTile = tile.getTile(tile.tileKeys[t]);\n      if (sourceTile.getState() != TileState.LOADED) {\n        continue;\n      }\n\n      const sourceTileCoord = sourceTile.tileCoord;\n      const sourceTileExtent = sourceTileGrid.getTileCoordExtent(sourceTileCoord);\n      const sharedExtent = getIntersection(tileExtent, sourceTileExtent);\n      const bufferedExtent = equals(sourceTileExtent, sharedExtent) ? null :\n        buffer(sharedExtent, layer.getRenderBuffer() * resolution, this.tmpExtent);\n      const tileProjection = sourceTile.getProjection();\n      let reproject = false;\n      if (!equivalentProjection(projection, tileProjection)) {\n        reproject = true;\n        sourceTile.setProjection(projection);\n      }\n      replayState.dirty = false;\n      const replayGroup = new CanvasReplayGroup(0, sharedExtent, resolution,\n        pixelRatio, source.getOverlaps(), this.declutterTree_, layer.getRenderBuffer());\n      const squaredTolerance = getSquaredRenderTolerance(resolution, pixelRatio);\n\n      /**\n       * @param {import(\"../../Feature.js\").FeatureLike} feature Feature.\n       * @this {CanvasVectorTileLayerRenderer}\n       */\n      const render = function(feature) {\n        let styles;\n        const styleFunction = feature.getStyleFunction() || layer.getStyleFunction();\n        if (styleFunction) {\n          styles = styleFunction(feature, resolution);\n        }\n        if (styles) {\n          const dirty = this.renderFeature(feature, squaredTolerance, styles, replayGroup);\n          this.dirty_ = this.dirty_ || dirty;\n          replayState.dirty = replayState.dirty || dirty;\n        }\n      };\n\n      const features = sourceTile.getFeatures();\n      if (renderOrder && renderOrder !== replayState.renderedRenderOrder) {\n        features.sort(renderOrder);\n      }\n      for (let i = 0, ii = features.length; i < ii; ++i) {\n        const feature = features[i];\n        if (reproject) {\n          if (tileProjection.getUnits() == Units.TILE_PIXELS) {\n            // projected tile extent\n            tileProjection.setWorldExtent(sourceTileExtent);\n            // tile extent in tile pixel space\n            tileProjection.setExtent(sourceTile.getExtent());\n          }\n          feature.getGeometry().transform(tileProjection, projection);\n        }\n        if (!bufferedExtent || intersects(bufferedExtent, feature.getGeometry().getExtent())) {\n          render.call(this, feature);\n        }\n      }\n      replayGroup.finish();\n      sourceTile.setReplayGroup(layer, tile.tileCoord.toString(), replayGroup);\n    }\n    replayState.renderedRevision = revision;\n    replayState.renderedRenderOrder = renderOrder;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  forEachFeatureAtCoordinate(coordinate, frameState, hitTolerance, callback, thisArg) {\n    const resolution = frameState.viewState.resolution;\n    const rotation = frameState.viewState.rotation;\n    hitTolerance = hitTolerance == undefined ? 0 : hitTolerance;\n    const layer = this.getLayer();\n    /** @type {!Object<string, boolean>} */\n    const features = {};\n\n    const renderedTiles = /** @type {Array<import(\"../../VectorImageTile.js\").default>} */ (this.renderedTiles);\n\n    let bufferedExtent, found;\n    let i, ii;\n    for (i = 0, ii = renderedTiles.length; i < ii; ++i) {\n      const tile = renderedTiles[i];\n      bufferedExtent = buffer(tile.extent, hitTolerance * resolution, bufferedExtent);\n      if (!containsCoordinate(bufferedExtent, coordinate)) {\n        continue;\n      }\n      for (let t = 0, tt = tile.tileKeys.length; t < tt; ++t) {\n        const sourceTile = tile.getTile(tile.tileKeys[t]);\n        if (sourceTile.getState() != TileState.LOADED) {\n          continue;\n        }\n        const replayGroup = /** @type {CanvasReplayGroup} */ (sourceTile.getReplayGroup(layer,\n          tile.tileCoord.toString()));\n        found = found || replayGroup.forEachFeatureAtCoordinate(coordinate, resolution, rotation, hitTolerance, {},\n          /**\n           * @param {import(\"../../Feature.js\").FeatureLike} feature Feature.\n           * @return {?} Callback result.\n           */\n          function(feature) {\n            const key = getUid(feature);\n            if (!(key in features)) {\n              features[key] = true;\n              return callback.call(thisArg, feature, layer);\n            }\n          }, null);\n      }\n    }\n    return found;\n  }\n\n  /**\n   * @param {import(\"../../VectorTile.js\").default} tile Tile.\n   * @param {import(\"../../PluggableMap.js\").FrameState} frameState Frame state.\n   * @return {import(\"../../transform.js\").Transform} transform Transform.\n   * @private\n   */\n  getReplayTransform_(tile, frameState) {\n    const layer = this.getLayer();\n    const source = /** @type {import(\"../../source/VectorTile.js\").default} */ (layer.getSource());\n    const tileGrid = source.getTileGrid();\n    const tileCoord = tile.tileCoord;\n    const tileResolution = tileGrid.getResolution(tileCoord[0]);\n    const viewState = frameState.viewState;\n    const pixelRatio = frameState.pixelRatio;\n    const renderResolution = viewState.resolution / pixelRatio;\n    const tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent);\n    const center = viewState.center;\n    const origin = getTopLeft(tileExtent);\n    const size = frameState.size;\n    const offsetX = Math.round(pixelRatio * size[0] / 2);\n    const offsetY = Math.round(pixelRatio * size[1] / 2);\n    return composeTransform(this.tmpTransform_,\n      offsetX, offsetY,\n      tileResolution / renderResolution, tileResolution / renderResolution,\n      viewState.rotation,\n      (origin[0] - center[0]) / tileResolution,\n      (center[1] - origin[1]) / tileResolution);\n  }\n\n  /**\n   * @param {import(\"../../events/Event.js\").default} event Event.\n   */\n  handleFontsChanged_(event) {\n    const layer = this.getLayer();\n    if (layer.getVisible() && this.renderedLayerRevision_ !== undefined) {\n      layer.changed();\n    }\n  }\n\n  /**\n   * Handle changes in image style state.\n   * @param {import(\"../../events/Event.js\").default} event Image style change event.\n   * @private\n   */\n  handleStyleImageChange_(event) {\n    this.renderIfReadyAndVisible();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  postCompose(context, frameState, layerState) {\n    const layer = /** @type {import(\"../../layer/Vector.js\").default} */ (this.getLayer());\n    const renderMode = layer.getRenderMode();\n    if (renderMode != VectorTileRenderType.IMAGE) {\n      const declutterReplays = layer.getDeclutter() ? {} : null;\n      const source = /** @type {import(\"../../source/VectorTile.js\").default} */ (layer.getSource());\n      const replayTypes = VECTOR_REPLAYS[renderMode];\n      const pixelRatio = frameState.pixelRatio;\n      const rotation = frameState.viewState.rotation;\n      const size = frameState.size;\n      let offsetX, offsetY;\n      if (rotation) {\n        offsetX = Math.round(pixelRatio * size[0] / 2);\n        offsetY = Math.round(pixelRatio * size[1] / 2);\n        rotateAtOffset(context, -rotation, offsetX, offsetY);\n      }\n      if (declutterReplays) {\n        this.declutterTree_.clear();\n      }\n      const viewHints = frameState.viewHints;\n      const snapToPixel = !(viewHints[ViewHint.ANIMATING] || viewHints[ViewHint.INTERACTING]);\n      const tiles = this.renderedTiles;\n      const tileGrid = source.getTileGridForProjection(frameState.viewState.projection);\n      const clips = [];\n      const zs = [];\n      for (let i = tiles.length - 1; i >= 0; --i) {\n        const tile = /** @type {import(\"../../VectorImageTile.js\").default} */ (tiles[i]);\n        if (tile.getState() == TileState.ABORT) {\n          continue;\n        }\n        const tileCoord = tile.tileCoord;\n        const worldOffset = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent)[0] - tile.extent[0];\n        let transform = undefined;\n        for (let t = 0, tt = tile.tileKeys.length; t < tt; ++t) {\n          const sourceTile = tile.getTile(tile.tileKeys[t]);\n          if (sourceTile.getState() != TileState.LOADED) {\n            continue;\n          }\n          const replayGroup = /** @type {CanvasReplayGroup} */ (sourceTile.getReplayGroup(layer, tileCoord.toString()));\n          if (!replayGroup || !replayGroup.hasReplays(replayTypes)) {\n            // sourceTile was not yet loaded when this.createReplayGroup_() was\n            // called, or it has no replays of the types we want to render\n            continue;\n          }\n          if (!transform) {\n            transform = this.getTransform(frameState, worldOffset);\n          }\n          const currentZ = sourceTile.tileCoord[0];\n          const currentClip = replayGroup.getClipCoords(transform);\n          context.save();\n          context.globalAlpha = layerState.opacity;\n          // Create a clip mask for regions in this low resolution tile that are\n          // already filled by a higher resolution tile\n          for (let j = 0, jj = clips.length; j < jj; ++j) {\n            const clip = clips[j];\n            if (currentZ < zs[j]) {\n              context.beginPath();\n              // counter-clockwise (outer ring) for current tile\n              context.moveTo(currentClip[0], currentClip[1]);\n              context.lineTo(currentClip[2], currentClip[3]);\n              context.lineTo(currentClip[4], currentClip[5]);\n              context.lineTo(currentClip[6], currentClip[7]);\n              // clockwise (inner ring) for higher resolution tile\n              context.moveTo(clip[6], clip[7]);\n              context.lineTo(clip[4], clip[5]);\n              context.lineTo(clip[2], clip[3]);\n              context.lineTo(clip[0], clip[1]);\n              context.clip();\n            }\n          }\n          replayGroup.replay(context, transform, rotation, {}, snapToPixel, replayTypes, declutterReplays);\n          context.restore();\n          clips.push(currentClip);\n          zs.push(currentZ);\n        }\n      }\n      if (declutterReplays) {\n        replayDeclutter(declutterReplays, context, rotation, snapToPixel);\n      }\n      if (rotation) {\n        rotateAtOffset(context, rotation,\n          /** @type {number} */ (offsetX), /** @type {number} */ (offsetY));\n      }\n    }\n    super.postCompose(context, frameState, layerState);\n  }\n\n  /**\n   * @param {import(\"../../Feature.js\").FeatureLike} feature Feature.\n   * @param {number} squaredTolerance Squared tolerance.\n   * @param {import(\"../../style/Style.js\").default|Array<import(\"../../style/Style.js\").default>} styles The style or array of styles.\n   * @param {import(\"../../render/canvas/ReplayGroup.js\").default} replayGroup Replay group.\n   * @return {boolean} `true` if an image is loading.\n   */\n  renderFeature(feature, squaredTolerance, styles, replayGroup) {\n    if (!styles) {\n      return false;\n    }\n    let loading = false;\n    if (Array.isArray(styles)) {\n      for (let i = 0, ii = styles.length; i < ii; ++i) {\n        loading = renderFeature(\n          replayGroup, feature, styles[i], squaredTolerance,\n          this.handleStyleImageChange_, this) || loading;\n      }\n    } else {\n      loading = renderFeature(\n        replayGroup, feature, styles, squaredTolerance,\n        this.handleStyleImageChange_, this);\n    }\n    return loading;\n  }\n\n  /**\n   * @param {import(\"../../VectorImageTile.js\").default} tile Tile.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"../../proj/Projection.js\").default} projection Projection.\n   * @private\n   */\n  renderTileImage_(tile, pixelRatio, projection) {\n    const layer = /** @type {import(\"../../layer/Vector.js\").default} */ (this.getLayer());\n    const replayState = tile.getReplayState(layer);\n    const revision = layer.getRevision();\n    const replays = IMAGE_REPLAYS[layer.getRenderMode()];\n    if (replays && replayState.renderedTileRevision !== revision) {\n      replayState.renderedTileRevision = revision;\n      const tileCoord = tile.wrappedTileCoord;\n      const z = tileCoord[0];\n      const source = /** @type {import(\"../../source/VectorTile.js\").default} */ (layer.getSource());\n      const tileGrid = source.getTileGridForProjection(projection);\n      const resolution = tileGrid.getResolution(z);\n      const context = tile.getContext(layer);\n      const size = source.getTilePixelSize(z, pixelRatio, projection);\n      context.canvas.width = size[0];\n      context.canvas.height = size[1];\n      const tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent);\n      for (let i = 0, ii = tile.tileKeys.length; i < ii; ++i) {\n        const sourceTile = tile.getTile(tile.tileKeys[i]);\n        if (sourceTile.getState() != TileState.LOADED) {\n          continue;\n        }\n        const pixelScale = pixelRatio / resolution;\n        const transform = resetTransform(this.tmpTransform_);\n        scaleTransform(transform, pixelScale, -pixelScale);\n        translateTransform(transform, -tileExtent[0], -tileExtent[3]);\n        const replayGroup = /** @type {CanvasReplayGroup} */ (sourceTile.getReplayGroup(layer,\n          tile.tileCoord.toString()));\n        replayGroup.replay(context, transform, 0, {}, true, replays);\n      }\n    }\n  }\n}\n\n\n/**\n * Determine if this renderer handles the provided layer.\n * @param {import(\"../../layer/Layer.js\").default} layer The candidate layer.\n * @return {boolean} The renderer can render the layer.\n */\nCanvasVectorTileLayerRenderer['handles'] = function(layer) {\n  return layer.getType() === LayerType.VECTOR_TILE;\n};\n\n\n/**\n * Create a layer renderer.\n * @param {import(\"../Map.js\").default} mapRenderer The map renderer.\n * @param {import(\"../../layer/Layer.js\").default} layer The layer to be rendererd.\n * @return {CanvasVectorTileLayerRenderer} The layer renderer.\n */\nCanvasVectorTileLayerRenderer['create'] = function(mapRenderer, layer) {\n  return new CanvasVectorTileLayerRenderer(/** @type {import(\"../../layer/VectorTile.js\").default} */ (layer));\n};\n\n\nexport default CanvasVectorTileLayerRenderer;\n","/**\n * @module ol/Map\n */\nimport PluggableMap from './PluggableMap.js';\nimport {defaults as defaultControls} from './control/util.js';\nimport {defaults as defaultInteractions} from './interaction.js';\nimport {assign} from './obj.js';\nimport CanvasImageLayerRenderer from './renderer/canvas/ImageLayer.js';\nimport CanvasMapRenderer from './renderer/canvas/Map.js';\nimport CanvasTileLayerRenderer from './renderer/canvas/TileLayer.js';\nimport CanvasVectorLayerRenderer from './renderer/canvas/VectorLayer.js';\nimport CanvasVectorTileLayerRenderer from './renderer/canvas/VectorTileLayer.js';\n\n/**\n * @classdesc\n * The map is the core component of OpenLayers. For a map to render, a view,\n * one or more layers, and a target container are needed:\n *\n *     import Map from 'ol/Map';\n *     import View from 'ol/View';\n *     import TileLayer from 'ol/layer/Tile';\n *     import OSM from 'ol/source/OSM';\n *\n *     var map = new Map({\n *       view: new View({\n *         center: [0, 0],\n *         zoom: 1\n *       }),\n *       layers: [\n *         new TileLayer({\n *           source: new OSM()\n *         })\n *       ],\n *       target: 'map'\n *     });\n *\n * The above snippet creates a map using a {@link module:ol/layer/Tile} to\n * display {@link module:ol/source/OSM~OSM} OSM data and render it to a DOM\n * element with the id `map`.\n *\n * The constructor places a viewport container (with CSS class name\n * `ol-viewport`) in the target element (see `getViewport()`), and then two\n * further elements within the viewport: one with CSS class name\n * `ol-overlaycontainer-stopevent` for controls and some overlays, and one with\n * CSS class name `ol-overlaycontainer` for other overlays (see the `stopEvent`\n * option of {@link module:ol/Overlay~Overlay} for the difference). The map\n * itself is placed in a further element within the viewport.\n *\n * Layers are stored as a {@link module:ol/Collection~Collection} in\n * layerGroups. A top-level group is provided by the library. This is what is\n * accessed by `getLayerGroup` and `setLayerGroup`. Layers entered in the\n * options are added to this group, and `addLayer` and `removeLayer` change the\n * layer collection in the group. `getLayers` is a convenience function for\n * `getLayerGroup().getLayers()`. Note that {@link module:ol/layer/Group~Group}\n * is a subclass of {@link module:ol/layer/Base}, so layers entered in the\n * options or added with `addLayer` can be groups, which can contain further\n * groups, and so on.\n *\n * @fires import(\"./MapBrowserEvent.js\").MapBrowserEvent\n * @fires import(\"./MapEvent.js\").MapEvent\n * @fires module:ol/render/Event~RenderEvent#postcompose\n * @fires module:ol/render/Event~RenderEvent#precompose\n * @api\n */\nclass Map extends PluggableMap {\n\n  /**\n   * @param {import(\"./PluggableMap.js\").MapOptions} options Map options.\n   */\n  constructor(options) {\n    options = assign({}, options);\n    if (!options.controls) {\n      options.controls = defaultControls();\n    }\n    if (!options.interactions) {\n      options.interactions = defaultInteractions();\n    }\n\n    super(options);\n  }\n\n  createRenderer() {\n    const renderer = new CanvasMapRenderer(this);\n    renderer.registerLayerRenderers([\n      CanvasImageLayerRenderer,\n      CanvasTileLayerRenderer,\n      CanvasVectorLayerRenderer,\n      CanvasVectorTileLayerRenderer\n    ]);\n    return renderer;\n  }\n}\n\n\nexport default Map;\n","/**\n * @module ol/format/XLink\n */\n\n\n/**\n * @const\n * @type {string}\n */\nconst NAMESPACE_URI = 'http://www.w3.org/1999/xlink';\n\n\n/**\n * @param {Element} node Node.\n * @return {string|undefined} href.\n */\nexport function readHref(node) {\n  return node.getAttributeNS(NAMESPACE_URI, 'href');\n}\n","/**\n * @module ol/xml\n */\nimport {extend} from './array.js';\n\n\n/**\n * When using {@link module:ol/xml~makeChildAppender} or\n * {@link module:ol/xml~makeSimpleNodeFactory}, the top `objectStack` item needs\n * to have this structure.\n * @typedef {Object} NodeStackItem\n * @property {Node} node\n */\n\n\n/**\n * @typedef {function(Element, Array<*>)} Parser\n */\n\n\n/**\n * @typedef {function(Element, *, Array<*>)} Serializer\n */\n\n\n/**\n * This document should be used when creating nodes for XML serializations. This\n * document is also used by {@link module:ol/xml~createElementNS}\n * @const\n * @type {Document}\n */\nexport const DOCUMENT = document.implementation.createDocument('', '', null);\n\n\n/**\n * @type {string}\n */\nexport const XML_SCHEMA_INSTANCE_URI = 'http://www.w3.org/2001/XMLSchema-instance';\n\n\n/**\n * @param {string} namespaceURI Namespace URI.\n * @param {string} qualifiedName Qualified name.\n * @return {Element} Node.\n */\nexport function createElementNS(namespaceURI, qualifiedName) {\n  return DOCUMENT.createElementNS(namespaceURI, qualifiedName);\n}\n\n\n/**\n * Recursively grab all text content of child nodes into a single string.\n * @param {Node} node Node.\n * @param {boolean} normalizeWhitespace Normalize whitespace: remove all line\n * breaks.\n * @return {string} All text content.\n * @api\n */\nexport function getAllTextContent(node, normalizeWhitespace) {\n  return getAllTextContent_(node, normalizeWhitespace, []).join('');\n}\n\n\n/**\n * Recursively grab all text content of child nodes into a single string.\n * @param {Node} node Node.\n * @param {boolean} normalizeWhitespace Normalize whitespace: remove all line\n * breaks.\n * @param {Array<string>} accumulator Accumulator.\n * @private\n * @return {Array<string>} Accumulator.\n */\nexport function getAllTextContent_(node, normalizeWhitespace, accumulator) {\n  if (node.nodeType == Node.CDATA_SECTION_NODE ||\n      node.nodeType == Node.TEXT_NODE) {\n    if (normalizeWhitespace) {\n      accumulator.push(String(node.nodeValue).replace(/(\\r\\n|\\r|\\n)/g, ''));\n    } else {\n      accumulator.push(node.nodeValue);\n    }\n  } else {\n    let n;\n    for (n = node.firstChild; n; n = n.nextSibling) {\n      getAllTextContent_(n, normalizeWhitespace, accumulator);\n    }\n  }\n  return accumulator;\n}\n\n\n/**\n * @param {Object} object Object.\n * @return {boolean} Is a document.\n */\nexport function isDocument(object) {\n  return 'documentElement' in object;\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {?string} namespaceURI Namespace URI.\n * @param {string} name Attribute name.\n * @return {string} Value\n */\nexport function getAttributeNS(node, namespaceURI, name) {\n  return node.getAttributeNS(namespaceURI, name) || '';\n}\n\n\n/**\n * Parse an XML string to an XML Document.\n * @param {string} xml XML.\n * @return {Document} Document.\n * @api\n */\nexport function parse(xml) {\n  return new DOMParser().parseFromString(xml, 'application/xml');\n}\n\n\n/**\n * Make an array extender function for extending the array at the top of the\n * object stack.\n * @param {function(this: T, Node, Array<*>): (Array<*>|undefined)} valueReader Value reader.\n * @param {T=} opt_this The object to use as `this` in `valueReader`.\n * @return {Parser} Parser.\n * @template T\n */\nexport function makeArrayExtender(valueReader, opt_this) {\n  return (\n    /**\n     * @param {Node} node Node.\n     * @param {Array<*>} objectStack Object stack.\n     */\n    function(node, objectStack) {\n      const value = valueReader.call(opt_this !== undefined ? opt_this : this, node, objectStack);\n      if (value !== undefined) {\n        const array = /** @type {Array<*>} */ (objectStack[objectStack.length - 1]);\n        extend(array, value);\n      }\n    }\n  );\n}\n\n\n/**\n * Make an array pusher function for pushing to the array at the top of the\n * object stack.\n * @param {function(this: T, Element, Array<*>): *} valueReader Value reader.\n * @param {T=} opt_this The object to use as `this` in `valueReader`.\n * @return {Parser} Parser.\n * @template T\n */\nexport function makeArrayPusher(valueReader, opt_this) {\n  return (\n    /**\n     * @param {Element} node Node.\n     * @param {Array<*>} objectStack Object stack.\n     */\n    function(node, objectStack) {\n      const value = valueReader.call(opt_this !== undefined ? opt_this : this, node, objectStack);\n      if (value !== undefined) {\n        const array = /** @type {Array<*>} */ (objectStack[objectStack.length - 1]);\n        array.push(value);\n      }\n    });\n}\n\n\n/**\n * Make an object stack replacer function for replacing the object at the\n * top of the stack.\n * @param {function(this: T, Node, Array<*>): *} valueReader Value reader.\n * @param {T=} opt_this The object to use as `this` in `valueReader`.\n * @return {Parser} Parser.\n * @template T\n */\nexport function makeReplacer(valueReader, opt_this) {\n  return (\n    /**\n     * @param {Node} node Node.\n     * @param {Array<*>} objectStack Object stack.\n     */\n    function(node, objectStack) {\n      const value = valueReader.call(opt_this !== undefined ? opt_this : this, node, objectStack);\n      if (value !== undefined) {\n        objectStack[objectStack.length - 1] = value;\n      }\n    });\n}\n\n\n/**\n * Make an object property pusher function for adding a property to the\n * object at the top of the stack.\n * @param {function(this: T, Element, Array<*>): *} valueReader Value reader.\n * @param {string=} opt_property Property.\n * @param {T=} opt_this The object to use as `this` in `valueReader`.\n * @return {Parser} Parser.\n * @template T\n */\nexport function makeObjectPropertyPusher(valueReader, opt_property, opt_this) {\n  return (\n    /**\n     * @param {Element} node Node.\n     * @param {Array<*>} objectStack Object stack.\n     */\n    function(node, objectStack) {\n      const value = valueReader.call(opt_this !== undefined ? opt_this : this, node, objectStack);\n      if (value !== undefined) {\n        const object = /** @type {!Object} */ (objectStack[objectStack.length - 1]);\n        const property = opt_property !== undefined ? opt_property : node.localName;\n        let array;\n        if (property in object) {\n          array = object[property];\n        } else {\n          array = object[property] = [];\n        }\n        array.push(value);\n      }\n    });\n}\n\n\n/**\n * Make an object property setter function.\n * @param {function(this: T, Element, Array<*>): *} valueReader Value reader.\n * @param {string=} opt_property Property.\n * @param {T=} opt_this The object to use as `this` in `valueReader`.\n * @return {Parser} Parser.\n * @template T\n */\nexport function makeObjectPropertySetter(valueReader, opt_property, opt_this) {\n  return (\n    /**\n     * @param {Element} node Node.\n     * @param {Array<*>} objectStack Object stack.\n     */\n    function(node, objectStack) {\n      const value = valueReader.call(opt_this !== undefined ? opt_this : this, node, objectStack);\n      if (value !== undefined) {\n        const object = /** @type {!Object} */ (objectStack[objectStack.length - 1]);\n        const property = opt_property !== undefined ? opt_property : node.localName;\n        object[property] = value;\n      }\n    });\n}\n\n\n/**\n * Create a serializer that appends nodes written by its `nodeWriter` to its\n * designated parent. The parent is the `node` of the\n * {@link module:ol/xml~NodeStackItem} at the top of the `objectStack`.\n * @param {function(this: T, Node, V, Array<*>)} nodeWriter Node writer.\n * @param {T=} opt_this The object to use as `this` in `nodeWriter`.\n * @return {Serializer} Serializer.\n * @template T, V\n */\nexport function makeChildAppender(nodeWriter, opt_this) {\n  return function(node, value, objectStack) {\n    nodeWriter.call(opt_this !== undefined ? opt_this : this, node, value, objectStack);\n    const parent = /** @type {NodeStackItem} */ (objectStack[objectStack.length - 1]);\n    const parentNode = parent.node;\n    parentNode.appendChild(node);\n  };\n}\n\n\n/**\n * Create a serializer that calls the provided `nodeWriter` from\n * {@link module:ol/xml~serialize}. This can be used by the parent writer to have the\n * 'nodeWriter' called with an array of values when the `nodeWriter` was\n * designed to serialize a single item. An example would be a LineString\n * geometry writer, which could be reused for writing MultiLineString\n * geometries.\n * @param {function(this: T, Element, V, Array<*>)} nodeWriter Node writer.\n * @param {T=} opt_this The object to use as `this` in `nodeWriter`.\n * @return {Serializer} Serializer.\n * @template T, V\n */\nexport function makeArraySerializer(nodeWriter, opt_this) {\n  let serializersNS, nodeFactory;\n  return function(node, value, objectStack) {\n    if (serializersNS === undefined) {\n      serializersNS = {};\n      const serializers = {};\n      serializers[node.localName] = nodeWriter;\n      serializersNS[node.namespaceURI] = serializers;\n      nodeFactory = makeSimpleNodeFactory(node.localName);\n    }\n    serialize(serializersNS, nodeFactory, value, objectStack);\n  };\n}\n\n\n/**\n * Create a node factory which can use the `opt_keys` passed to\n * {@link module:ol/xml~serialize} or {@link module:ol/xml~pushSerializeAndPop} as node names,\n * or a fixed node name. The namespace of the created nodes can either be fixed,\n * or the parent namespace will be used.\n * @param {string=} opt_nodeName Fixed node name which will be used for all\n *     created nodes. If not provided, the 3rd argument to the resulting node\n *     factory needs to be provided and will be the nodeName.\n * @param {string=} opt_namespaceURI Fixed namespace URI which will be used for\n *     all created nodes. If not provided, the namespace of the parent node will\n *     be used.\n * @return {function(*, Array<*>, string=): (Node|undefined)} Node factory.\n */\nexport function makeSimpleNodeFactory(opt_nodeName, opt_namespaceURI) {\n  const fixedNodeName = opt_nodeName;\n  return (\n    /**\n     * @param {*} value Value.\n     * @param {Array<*>} objectStack Object stack.\n     * @param {string=} opt_nodeName Node name.\n     * @return {Node} Node.\n     */\n    function(value, objectStack, opt_nodeName) {\n      const context = /** @type {NodeStackItem} */ (objectStack[objectStack.length - 1]);\n      const node = context.node;\n      let nodeName = fixedNodeName;\n      if (nodeName === undefined) {\n        nodeName = opt_nodeName;\n      }\n\n      const namespaceURI = opt_namespaceURI !== undefined ? opt_namespaceURI : node.namespaceURI;\n      return createElementNS(namespaceURI, /** @type {string} */ (nodeName));\n    }\n  );\n}\n\n\n/**\n * A node factory that creates a node using the parent's `namespaceURI` and the\n * `nodeName` passed by {@link module:ol/xml~serialize} or\n * {@link module:ol/xml~pushSerializeAndPop} to the node factory.\n * @const\n * @type {function(*, Array<*>, string=): (Node|undefined)}\n */\nexport const OBJECT_PROPERTY_NODE_FACTORY = makeSimpleNodeFactory();\n\n\n/**\n * Create an array of `values` to be used with {@link module:ol/xml~serialize} or\n * {@link module:ol/xml~pushSerializeAndPop}, where `orderedKeys` has to be provided as\n * `opt_key` argument.\n * @param {Object<string, V>} object Key-value pairs for the sequence. Keys can\n *     be a subset of the `orderedKeys`.\n * @param {Array<string>} orderedKeys Keys in the order of the sequence.\n * @return {Array<V>} Values in the order of the sequence. The resulting array\n *     has the same length as the `orderedKeys` array. Values that are not\n *     present in `object` will be `undefined` in the resulting array.\n * @template V\n */\nexport function makeSequence(object, orderedKeys) {\n  const length = orderedKeys.length;\n  const sequence = new Array(length);\n  for (let i = 0; i < length; ++i) {\n    sequence[i] = object[orderedKeys[i]];\n  }\n  return sequence;\n}\n\n\n/**\n * Create a namespaced structure, using the same values for each namespace.\n * This can be used as a starting point for versioned parsers, when only a few\n * values are version specific.\n * @param {Array<string>} namespaceURIs Namespace URIs.\n * @param {T} structure Structure.\n * @param {Object<string, T>=} opt_structureNS Namespaced structure to add to.\n * @return {Object<string, T>} Namespaced structure.\n * @template T\n */\nexport function makeStructureNS(namespaceURIs, structure, opt_structureNS) {\n  /**\n   * @type {Object<string, T>}\n   */\n  const structureNS = opt_structureNS !== undefined ? opt_structureNS : {};\n  let i, ii;\n  for (i = 0, ii = namespaceURIs.length; i < ii; ++i) {\n    structureNS[namespaceURIs[i]] = structure;\n  }\n  return structureNS;\n}\n\n\n/**\n * Parse a node using the parsers and object stack.\n * @param {Object<string, Object<string, Parser>>} parsersNS\n *     Parsers by namespace.\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @param {*=} opt_this The object to use as `this`.\n */\nexport function parseNode(parsersNS, node, objectStack, opt_this) {\n  let n;\n  for (n = node.firstElementChild; n; n = n.nextElementSibling) {\n    const parsers = parsersNS[n.namespaceURI];\n    if (parsers !== undefined) {\n      const parser = parsers[n.localName];\n      if (parser !== undefined) {\n        parser.call(opt_this, n, objectStack);\n      }\n    }\n  }\n}\n\n\n/**\n * Push an object on top of the stack, parse and return the popped object.\n * @param {T} object Object.\n * @param {Object<string, Object<string, Parser>>} parsersNS\n *     Parsers by namespace.\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @param {*=} opt_this The object to use as `this`.\n * @return {T} Object.\n * @template T\n */\nexport function pushParseAndPop(object, parsersNS, node, objectStack, opt_this) {\n  objectStack.push(object);\n  parseNode(parsersNS, node, objectStack, opt_this);\n  return /** @type {T} */ (objectStack.pop());\n}\n\n\n/**\n * Walk through an array of `values` and call a serializer for each value.\n * @param {Object<string, Object<string, Serializer>>} serializersNS\n *     Namespaced serializers.\n * @param {function(this: T, *, Array<*>, (string|undefined)): (Node|undefined)} nodeFactory\n *     Node factory. The `nodeFactory` creates the node whose namespace and name\n *     will be used to choose a node writer from `serializersNS`. This\n *     separation allows us to decide what kind of node to create, depending on\n *     the value we want to serialize. An example for this would be different\n *     geometry writers based on the geometry type.\n * @param {Array<*>} values Values to serialize. An example would be an array\n *     of {@link module:ol/Feature~Feature} instances.\n * @param {Array<*>} objectStack Node stack.\n * @param {Array<string>=} opt_keys Keys of the `values`. Will be passed to the\n *     `nodeFactory`. This is used for serializing object literals where the\n *     node name relates to the property key. The array length of `opt_keys` has\n *     to match the length of `values`. For serializing a sequence, `opt_keys`\n *     determines the order of the sequence.\n * @param {T=} opt_this The object to use as `this` for the node factory and\n *     serializers.\n * @template T\n */\nexport function serialize(\n  serializersNS, nodeFactory, values, objectStack, opt_keys, opt_this) {\n  const length = (opt_keys !== undefined ? opt_keys : values).length;\n  let value, node;\n  for (let i = 0; i < length; ++i) {\n    value = values[i];\n    if (value !== undefined) {\n      node = nodeFactory.call(opt_this !== undefined ? opt_this : this, value, objectStack,\n        opt_keys !== undefined ? opt_keys[i] : undefined);\n      if (node !== undefined) {\n        serializersNS[node.namespaceURI][node.localName]\n          .call(opt_this, node, value, objectStack);\n      }\n    }\n  }\n}\n\n\n/**\n * @param {O} object Object.\n * @param {Object<string, Object<string, Serializer>>} serializersNS\n *     Namespaced serializers.\n * @param {function(this: T, *, Array<*>, (string|undefined)): (Node|undefined)} nodeFactory\n *     Node factory. The `nodeFactory` creates the node whose namespace and name\n *     will be used to choose a node writer from `serializersNS`. This\n *     separation allows us to decide what kind of node to create, depending on\n *     the value we want to serialize. An example for this would be different\n *     geometry writers based on the geometry type.\n * @param {Array<*>} values Values to serialize. An example would be an array\n *     of {@link module:ol/Feature~Feature} instances.\n * @param {Array<*>} objectStack Node stack.\n * @param {Array<string>=} opt_keys Keys of the `values`. Will be passed to the\n *     `nodeFactory`. This is used for serializing object literals where the\n *     node name relates to the property key. The array length of `opt_keys` has\n *     to match the length of `values`. For serializing a sequence, `opt_keys`\n *     determines the order of the sequence.\n * @param {T=} opt_this The object to use as `this` for the node factory and\n *     serializers.\n * @return {O|undefined} Object.\n * @template O, T\n */\nexport function pushSerializeAndPop(object, serializersNS, nodeFactory, values, objectStack, opt_keys, opt_this) {\n  objectStack.push(object);\n  serialize(serializersNS, nodeFactory, values, objectStack, opt_keys, opt_this);\n  return /** @type {O|undefined} */ (objectStack.pop());\n}\n","/**\n * @module ol/format/XML\n */\nimport {isDocument, parse} from '../xml.js';\n\n/**\n * @classdesc\n * Generic format for reading non-feature XML data\n *\n * @abstract\n */\nclass XML {\n  /**\n   * Read the source document.\n   *\n   * @param {Document|Element|string} source The XML source.\n   * @return {Object} An object representing the source.\n   * @api\n   */\n  read(source) {\n    if (!source) {\n      return null;\n    } else if (typeof source === 'string') {\n      const doc = parse(source);\n      return this.readFromDocument(doc);\n    } else if (isDocument(source)) {\n      return this.readFromDocument(/** @type {Document} */ (source));\n    } else {\n      return this.readFromNode(/** @type {Element} */ (source));\n    }\n  }\n\n  /**\n   * @abstract\n   * @param {Document} doc Document.\n   * @return {Object} Object\n   */\n  readFromDocument(doc) {}\n\n  /**\n   * @abstract\n   * @param {Element} node Node.\n   * @return {Object} Object\n   */\n  readFromNode(node) {}\n}\n\nexport default XML;\n","/**\n * @module ol/format/xsd\n */\nimport {getAllTextContent, DOCUMENT} from '../xml.js';\nimport {padNumber} from '../string.js';\n\n\n/**\n * @param {Node} node Node.\n * @return {boolean|undefined} Boolean.\n */\nexport function readBoolean(node) {\n  const s = getAllTextContent(node, false);\n  return readBooleanString(s);\n}\n\n\n/**\n * @param {string} string String.\n * @return {boolean|undefined} Boolean.\n */\nexport function readBooleanString(string) {\n  const m = /^\\s*(true|1)|(false|0)\\s*$/.exec(string);\n  if (m) {\n    return m[1] !== undefined || false;\n  } else {\n    return undefined;\n  }\n}\n\n\n/**\n * @param {Node} node Node.\n * @return {number|undefined} DateTime in seconds.\n */\nexport function readDateTime(node) {\n  const s = getAllTextContent(node, false);\n  const dateTime = Date.parse(s);\n  return isNaN(dateTime) ? undefined : dateTime / 1000;\n}\n\n\n/**\n * @param {Node} node Node.\n * @return {number|undefined} Decimal.\n */\nexport function readDecimal(node) {\n  const s = getAllTextContent(node, false);\n  return readDecimalString(s);\n}\n\n\n/**\n * @param {string} string String.\n * @return {number|undefined} Decimal.\n */\nexport function readDecimalString(string) {\n  // FIXME check spec\n  const m = /^\\s*([+\\-]?\\d*\\.?\\d+(?:e[+\\-]?\\d+)?)\\s*$/i.exec(string);\n  if (m) {\n    return parseFloat(m[1]);\n  } else {\n    return undefined;\n  }\n}\n\n\n/**\n * @param {Node} node Node.\n * @return {number|undefined} Non negative integer.\n */\nexport function readNonNegativeInteger(node) {\n  const s = getAllTextContent(node, false);\n  return readNonNegativeIntegerString(s);\n}\n\n\n/**\n * @param {string} string String.\n * @return {number|undefined} Non negative integer.\n */\nexport function readNonNegativeIntegerString(string) {\n  const m = /^\\s*(\\d+)\\s*$/.exec(string);\n  if (m) {\n    return parseInt(m[1], 10);\n  } else {\n    return undefined;\n  }\n}\n\n\n/**\n * @param {Node} node Node.\n * @return {string|undefined} String.\n */\nexport function readString(node) {\n  return getAllTextContent(node, false).trim();\n}\n\n\n/**\n * @param {Node} node Node to append a TextNode with the boolean to.\n * @param {boolean} bool Boolean.\n */\nexport function writeBooleanTextNode(node, bool) {\n  writeStringTextNode(node, (bool) ? '1' : '0');\n}\n\n\n/**\n * @param {Node} node Node to append a CDATA Section with the string to.\n * @param {string} string String.\n */\nexport function writeCDATASection(node, string) {\n  node.appendChild(DOCUMENT.createCDATASection(string));\n}\n\n\n/**\n * @param {Node} node Node to append a TextNode with the dateTime to.\n * @param {number} dateTime DateTime in seconds.\n */\nexport function writeDateTimeTextNode(node, dateTime) {\n  const date = new Date(dateTime * 1000);\n  const string = date.getUTCFullYear() + '-' +\n      padNumber(date.getUTCMonth() + 1, 2) + '-' +\n      padNumber(date.getUTCDate(), 2) + 'T' +\n      padNumber(date.getUTCHours(), 2) + ':' +\n      padNumber(date.getUTCMinutes(), 2) + ':' +\n      padNumber(date.getUTCSeconds(), 2) + 'Z';\n  node.appendChild(DOCUMENT.createTextNode(string));\n}\n\n\n/**\n * @param {Node} node Node to append a TextNode with the decimal to.\n * @param {number} decimal Decimal.\n */\nexport function writeDecimalTextNode(node, decimal) {\n  const string = decimal.toPrecision();\n  node.appendChild(DOCUMENT.createTextNode(string));\n}\n\n\n/**\n * @param {Node} node Node to append a TextNode with the decimal to.\n * @param {number} nonNegativeInteger Non negative integer.\n */\nexport function writeNonNegativeIntegerTextNode(node, nonNegativeInteger) {\n  const string = nonNegativeInteger.toString();\n  node.appendChild(DOCUMENT.createTextNode(string));\n}\n\n\n/**\n * @param {Node} node Node to append a TextNode with the string to.\n * @param {string} string String.\n */\nexport function writeStringTextNode(node, string) {\n  node.appendChild(DOCUMENT.createTextNode(string));\n}\n","/**\n * @module ol/format/OWS\n */\nimport {readHref} from './XLink.js';\nimport XML from './XML.js';\nimport {readString} from './xsd.js';\nimport {makeObjectPropertyPusher, makeObjectPropertySetter, makeStructureNS, pushParseAndPop} from '../xml.js';\n\n\n/**\n * @const\n * @type {Array<null|string>}\n */\nconst NAMESPACE_URIS = [null, 'http://www.opengis.net/ows/1.1'];\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'ServiceIdentification': makeObjectPropertySetter(readServiceIdentification),\n    'ServiceProvider': makeObjectPropertySetter(readServiceProvider),\n    'OperationsMetadata': makeObjectPropertySetter(readOperationsMetadata)\n  });\n\n\nclass OWS extends XML {\n  constructor() {\n    super();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  readFromDocument(doc) {\n    for (let n = doc.firstChild; n; n = n.nextSibling) {\n      if (n.nodeType == Node.ELEMENT_NODE) {\n        return this.readFromNode(n);\n      }\n    }\n    return null;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  readFromNode(node) {\n    const owsObject = pushParseAndPop({},\n      PARSERS, node, []);\n    return owsObject ? owsObject : null;\n  }\n}\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst ADDRESS_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'DeliveryPoint': makeObjectPropertySetter(readString),\n    'City': makeObjectPropertySetter(readString),\n    'AdministrativeArea': makeObjectPropertySetter(readString),\n    'PostalCode': makeObjectPropertySetter(readString),\n    'Country': makeObjectPropertySetter(readString),\n    'ElectronicMailAddress': makeObjectPropertySetter(readString)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst ALLOWED_VALUES_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'Value': makeObjectPropertyPusher(readValue)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst CONSTRAINT_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'AllowedValues': makeObjectPropertySetter(readAllowedValues)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst CONTACT_INFO_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'Phone': makeObjectPropertySetter(readPhone),\n    'Address': makeObjectPropertySetter(readAddress)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst DCP_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'HTTP': makeObjectPropertySetter(readHttp)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst HTTP_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'Get': makeObjectPropertyPusher(readGet),\n    'Post': undefined // TODO\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst OPERATION_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'DCP': makeObjectPropertySetter(readDcp)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst OPERATIONS_METADATA_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'Operation': readOperation\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst PHONE_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'Voice': makeObjectPropertySetter(readString),\n    'Facsimile': makeObjectPropertySetter(readString)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst REQUEST_METHOD_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'Constraint': makeObjectPropertyPusher(readConstraint)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst SERVICE_CONTACT_PARSERS =\n    makeStructureNS(\n      NAMESPACE_URIS, {\n        'IndividualName': makeObjectPropertySetter(readString),\n        'PositionName': makeObjectPropertySetter(readString),\n        'ContactInfo': makeObjectPropertySetter(readContactInfo)\n      });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst SERVICE_IDENTIFICATION_PARSERS =\n    makeStructureNS(\n      NAMESPACE_URIS, {\n        'Abstract': makeObjectPropertySetter(readString),\n        'AccessConstraints': makeObjectPropertySetter(readString),\n        'Fees': makeObjectPropertySetter(readString),\n        'Title': makeObjectPropertySetter(readString),\n        'ServiceTypeVersion': makeObjectPropertySetter(readString),\n        'ServiceType': makeObjectPropertySetter(readString)\n      });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst SERVICE_PROVIDER_PARSERS =\n    makeStructureNS(\n      NAMESPACE_URIS, {\n        'ProviderName': makeObjectPropertySetter(readString),\n        'ProviderSite': makeObjectPropertySetter(readHref),\n        'ServiceContact': makeObjectPropertySetter(readServiceContact)\n      });\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The address.\n */\nfunction readAddress(node, objectStack) {\n  return pushParseAndPop({},\n    ADDRESS_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The values.\n */\nfunction readAllowedValues(node, objectStack) {\n  return pushParseAndPop({},\n    ALLOWED_VALUES_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The constraint.\n */\nfunction readConstraint(node, objectStack) {\n  const name = node.getAttribute('name');\n  if (!name) {\n    return undefined;\n  }\n  return pushParseAndPop({'name': name},\n    CONSTRAINT_PARSERS, node,\n    objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The contact info.\n */\nfunction readContactInfo(node, objectStack) {\n  return pushParseAndPop({},\n    CONTACT_INFO_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The DCP.\n */\nfunction readDcp(node, objectStack) {\n  return pushParseAndPop({},\n    DCP_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The GET object.\n */\nfunction readGet(node, objectStack) {\n  const href = readHref(node);\n  if (!href) {\n    return undefined;\n  }\n  return pushParseAndPop({'href': href},\n    REQUEST_METHOD_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The HTTP object.\n */\nfunction readHttp(node, objectStack) {\n  return pushParseAndPop({}, HTTP_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The operation.\n */\nfunction readOperation(node, objectStack) {\n  const name = node.getAttribute('name');\n  const value = pushParseAndPop({},\n    OPERATION_PARSERS, node, objectStack);\n  if (!value) {\n    return undefined;\n  }\n  const object = /** @type {Object} */\n      (objectStack[objectStack.length - 1]);\n  object[name] = value;\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The operations metadata.\n */\nfunction readOperationsMetadata(node, objectStack) {\n  return pushParseAndPop({},\n    OPERATIONS_METADATA_PARSERS, node,\n    objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The phone.\n */\nfunction readPhone(node, objectStack) {\n  return pushParseAndPop({},\n    PHONE_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The service identification.\n */\nfunction readServiceIdentification(node, objectStack) {\n  return pushParseAndPop(\n    {}, SERVICE_IDENTIFICATION_PARSERS, node,\n    objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The service contact.\n */\nfunction readServiceContact(node, objectStack) {\n  return pushParseAndPop(\n    {}, SERVICE_CONTACT_PARSERS, node,\n    objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} The service provider.\n */\nfunction readServiceProvider(node, objectStack) {\n  return pushParseAndPop(\n    {}, SERVICE_PROVIDER_PARSERS, node,\n    objectStack);\n}\n\n\n/**\n * @param {Node} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {string|undefined} The value.\n */\nfunction readValue(node, objectStack) {\n  return readString(node);\n}\n\n\nexport default OWS;\n","/**\n * @module ol/format/WMTSCapabilities\n */\nimport {boundingExtent} from '../extent.js';\nimport OWS from './OWS.js';\nimport {readHref} from './XLink.js';\nimport XML from './XML.js';\nimport {readString, readNonNegativeInteger, readDecimal} from './xsd.js';\nimport {pushParseAndPop, makeStructureNS,\n  makeObjectPropertySetter, makeObjectPropertyPusher, makeArrayPusher} from '../xml.js';\n\n\n/**\n * @const\n * @type {Array<null|string>}\n */\nconst NAMESPACE_URIS = [\n  null,\n  'http://www.opengis.net/wmts/1.0'\n];\n\n\n/**\n * @const\n * @type {Array<null|string>}\n */\nconst OWS_NAMESPACE_URIS = [\n  null,\n  'http://www.opengis.net/ows/1.1'\n];\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'Contents': makeObjectPropertySetter(readContents)\n  });\n\n\n/**\n * @classdesc\n * Format for reading WMTS capabilities data.\n *\n * @api\n */\nclass WMTSCapabilities extends XML {\n  constructor() {\n    super();\n\n    /**\n     * @type {OWS}\n     * @private\n     */\n    this.owsParser_ = new OWS();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  readFromDocument(doc) {\n    for (let n = doc.firstChild; n; n = n.nextSibling) {\n      if (n.nodeType == Node.ELEMENT_NODE) {\n        return this.readFromNode(n);\n      }\n    }\n    return null;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  readFromNode(node) {\n    const version = node.getAttribute('version').trim();\n    let WMTSCapabilityObject = this.owsParser_.readFromNode(node);\n    if (!WMTSCapabilityObject) {\n      return null;\n    }\n    WMTSCapabilityObject['version'] = version;\n    WMTSCapabilityObject = pushParseAndPop(WMTSCapabilityObject, PARSERS, node, []);\n    return WMTSCapabilityObject ? WMTSCapabilityObject : null;\n  }\n}\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst CONTENTS_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'Layer': makeObjectPropertyPusher(readLayer),\n    'TileMatrixSet': makeObjectPropertyPusher(readTileMatrixSet)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst LAYER_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'Style': makeObjectPropertyPusher(readStyle),\n    'Format': makeObjectPropertyPusher(readString),\n    'TileMatrixSetLink': makeObjectPropertyPusher(readTileMatrixSetLink),\n    'Dimension': makeObjectPropertyPusher(readDimensions),\n    'ResourceURL': makeObjectPropertyPusher(readResourceUrl)\n  }, makeStructureNS(OWS_NAMESPACE_URIS, {\n    'Title': makeObjectPropertySetter(readString),\n    'Abstract': makeObjectPropertySetter(readString),\n    'WGS84BoundingBox': makeObjectPropertySetter(readWgs84BoundingBox),\n    'Identifier': makeObjectPropertySetter(readString)\n  }));\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst STYLE_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'LegendURL': makeObjectPropertyPusher(readLegendUrl)\n  }, makeStructureNS(OWS_NAMESPACE_URIS, {\n    'Title': makeObjectPropertySetter(readString),\n    'Identifier': makeObjectPropertySetter(readString)\n  }));\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst TMS_LINKS_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'TileMatrixSet': makeObjectPropertySetter(readString),\n    'TileMatrixSetLimits': makeObjectPropertySetter(readTileMatrixLimitsList)\n  });\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst TMS_LIMITS_LIST_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'TileMatrixLimits': makeArrayPusher(readTileMatrixLimits)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst TMS_LIMITS_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'TileMatrix': makeObjectPropertySetter(readString),\n    'MinTileRow': makeObjectPropertySetter(readNonNegativeInteger),\n    'MaxTileRow': makeObjectPropertySetter(readNonNegativeInteger),\n    'MinTileCol': makeObjectPropertySetter(readNonNegativeInteger),\n    'MaxTileCol': makeObjectPropertySetter(readNonNegativeInteger)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst DIMENSION_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'Default': makeObjectPropertySetter(readString),\n    'Value': makeObjectPropertyPusher(readString)\n  }, makeStructureNS(OWS_NAMESPACE_URIS, {\n    'Identifier': makeObjectPropertySetter(readString)\n  }));\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst WGS84_BBOX_READERS = makeStructureNS(\n  OWS_NAMESPACE_URIS, {\n    'LowerCorner': makeArrayPusher(readCoordinates),\n    'UpperCorner': makeArrayPusher(readCoordinates)\n  });\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst TMS_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'WellKnownScaleSet': makeObjectPropertySetter(readString),\n    'TileMatrix': makeObjectPropertyPusher(readTileMatrix)\n  }, makeStructureNS(OWS_NAMESPACE_URIS, {\n    'SupportedCRS': makeObjectPropertySetter(readString),\n    'Identifier': makeObjectPropertySetter(readString)\n  }));\n\n\n/**\n * @const\n * @type {Object<string, Object<string, import(\"../xml.js\").Parser>>}\n */\nconst TM_PARSERS = makeStructureNS(\n  NAMESPACE_URIS, {\n    'TopLeftCorner': makeObjectPropertySetter(readCoordinates),\n    'ScaleDenominator': makeObjectPropertySetter(readDecimal),\n    'TileWidth': makeObjectPropertySetter(readNonNegativeInteger),\n    'TileHeight': makeObjectPropertySetter(readNonNegativeInteger),\n    'MatrixWidth': makeObjectPropertySetter(readNonNegativeInteger),\n    'MatrixHeight': makeObjectPropertySetter(readNonNegativeInteger)\n  }, makeStructureNS(OWS_NAMESPACE_URIS, {\n    'Identifier': makeObjectPropertySetter(readString)\n  }));\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} Attribution object.\n */\nfunction readContents(node, objectStack) {\n  return pushParseAndPop({}, CONTENTS_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} Layers object.\n */\nfunction readLayer(node, objectStack) {\n  return pushParseAndPop({}, LAYER_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} Tile Matrix Set object.\n */\nfunction readTileMatrixSet(node, objectStack) {\n  return pushParseAndPop({}, TMS_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} Style object.\n */\nfunction readStyle(node, objectStack) {\n  const style = pushParseAndPop({}, STYLE_PARSERS, node, objectStack);\n  if (!style) {\n    return undefined;\n  }\n  const isDefault = node.getAttribute('isDefault') === 'true';\n  style['isDefault'] = isDefault;\n  return style;\n\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} Tile Matrix Set Link object.\n */\nfunction readTileMatrixSetLink(node, objectStack) {\n  return pushParseAndPop({}, TMS_LINKS_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} Dimension object.\n */\nfunction readDimensions(node, objectStack) {\n  return pushParseAndPop({}, DIMENSION_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} Resource URL object.\n */\nfunction readResourceUrl(node, objectStack) {\n  const format = node.getAttribute('format');\n  const template = node.getAttribute('template');\n  const resourceType = node.getAttribute('resourceType');\n  const resource = {};\n  if (format) {\n    resource['format'] = format;\n  }\n  if (template) {\n    resource['template'] = template;\n  }\n  if (resourceType) {\n    resource['resourceType'] = resourceType;\n  }\n  return resource;\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} WGS84 BBox object.\n */\nfunction readWgs84BoundingBox(node, objectStack) {\n  const coordinates = pushParseAndPop([], WGS84_BBOX_READERS, node, objectStack);\n  if (coordinates.length != 2) {\n    return undefined;\n  }\n  return boundingExtent(coordinates);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} Legend object.\n */\nfunction readLegendUrl(node, objectStack) {\n  const legend = {};\n  legend['format'] = node.getAttribute('format');\n  legend['href'] = readHref(node);\n  return legend;\n}\n\n\n/**\n * @param {Node} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} Coordinates object.\n */\nfunction readCoordinates(node, objectStack) {\n  const coordinates = readString(node).split(/\\s+/);\n  if (!coordinates || coordinates.length != 2) {\n    return undefined;\n  }\n  const x = +coordinates[0];\n  const y = +coordinates[1];\n  if (isNaN(x) || isNaN(y)) {\n    return undefined;\n  }\n  return [x, y];\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} TileMatrix object.\n */\nfunction readTileMatrix(node, objectStack) {\n  return pushParseAndPop({}, TM_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} TileMatrixSetLimits Object.\n */\nfunction readTileMatrixLimitsList(node, objectStack) {\n  return pushParseAndPop([], TMS_LIMITS_LIST_PARSERS, node, objectStack);\n}\n\n\n/**\n * @param {Element} node Node.\n * @param {Array<*>} objectStack Object stack.\n * @return {Object|undefined} TileMatrixLimits Array.\n */\nfunction readTileMatrixLimits(node, objectStack) {\n  return pushParseAndPop({}, TMS_LIMITS_PARSERS, node, objectStack);\n}\n\n\nexport default WMTSCapabilities;\n","/**\n * @module ol/layer/TileProperty\n */\n\n/**\n * @enum {string}\n */\nexport default {\n  PRELOAD: 'preload',\n  USE_INTERIM_TILES_ON_ERROR: 'useInterimTilesOnError'\n};\n","/**\n * @module ol/layer/Tile\n */\nimport LayerType from '../LayerType.js';\nimport Layer from './Layer.js';\nimport TileProperty from './TileProperty.js';\nimport {assign} from '../obj.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [opacity=1] Opacity (0, 1).\n * @property {boolean} [visible=true] Visibility.\n * @property {import(\"../extent.js\").Extent} [extent] The bounding extent for layer rendering.  The layer will not be\n * rendered outside of this extent.\n * @property {number} [zIndex] The z-index for layer rendering.  At rendering time, the layers\n * will be ordered, first by Z-index and then by position. When `undefined`, a `zIndex` of 0 is assumed\n * for layers that are added to the map's `layers` collection, or `Infinity` when the layer's `setMap()`\n * method was used.\n * @property {number} [minResolution] The minimum resolution (inclusive) at which this layer will be\n * visible.\n * @property {number} [maxResolution] The maximum resolution (exclusive) below which this layer will\n * be visible.\n * @property {number} [preload=0] Preload. Load low-resolution tiles up to `preload` levels. `0`\n * means no preloading.\n * @property {import(\"../source/Tile.js\").default} [source] Source for this layer.\n * @property {import(\"../PluggableMap.js\").default} [map] Sets the layer as overlay on a map. The map will not manage\n * this layer in its layers collection, and the layer will be rendered on top. This is useful for\n * temporary layers. The standard way to add a layer to a map and have it managed by the map is to\n * use {@link module:ol/Map#addLayer}.\n * @property {boolean} [useInterimTilesOnError=true] Use interim tiles on error.\n */\n\n/**\n * @classdesc\n * For layer sources that provide pre-rendered, tiled images in grids that are\n * organized by zoom levels for specific resolutions.\n * Note that any property set in the options is set as a {@link module:ol/Object~BaseObject}\n * property on the layer object; for example, setting `title: 'My Title'` in the\n * options means that `title` is observable, and has get/set accessors.\n *\n * @api\n */\nclass TileLayer extends Layer {\n  /**\n   * @param {Options=} opt_options Tile layer options.\n   */\n  constructor(opt_options) {\n    const options = opt_options ? opt_options : {};\n\n    const baseOptions = assign({}, options);\n\n    delete baseOptions.preload;\n    delete baseOptions.useInterimTilesOnError;\n    super(baseOptions);\n\n    this.setPreload(options.preload !== undefined ? options.preload : 0);\n    this.setUseInterimTilesOnError(options.useInterimTilesOnError !== undefined ?\n      options.useInterimTilesOnError : true);\n\n    /**\n    * The layer type.\n    * @protected\n    * @type {import(\"../LayerType.js\").default}\n    */\n    this.type = LayerType.TILE;\n\n  }\n\n  /**\n  * Return the level as number to which we will preload tiles up to.\n  * @return {number} The level to preload tiles up to.\n  * @observable\n  * @api\n  */\n  getPreload() {\n    return /** @type {number} */ (this.get(TileProperty.PRELOAD));\n  }\n\n  /**\n  * Set the level as number to which we will preload tiles up to.\n  * @param {number} preload The level to preload tiles up to.\n  * @observable\n  * @api\n  */\n  setPreload(preload) {\n    this.set(TileProperty.PRELOAD, preload);\n  }\n\n  /**\n  * Whether we use interim tiles on error.\n  * @return {boolean} Use interim tiles on error.\n  * @observable\n  * @api\n  */\n  getUseInterimTilesOnError() {\n    return /** @type {boolean} */ (this.get(TileProperty.USE_INTERIM_TILES_ON_ERROR));\n  }\n\n  /**\n  * Set whether we use interim tiles on error.\n  * @param {boolean} useInterimTilesOnError Use interim tiles on error.\n  * @observable\n  * @api\n  */\n  setUseInterimTilesOnError(useInterimTilesOnError) {\n    this.set(TileProperty.USE_INTERIM_TILES_ON_ERROR, useInterimTilesOnError);\n  }\n}\n\n\n/**\n * Return the associated {@link module:ol/source/Tile tilesource} of the layer.\n * @function\n * @return {import(\"../source/Tile.js\").default} Source.\n * @api\n */\nTileLayer.prototype.getSource;\n\n\nexport default TileLayer;\n","/**\n * @module ol/tilecoord\n */\n\n\n/**\n * An array of three numbers representing the location of a tile in a tile\n * grid. The order is `z`, `x`, and `y`. `z` is the zoom level.\n * @typedef {Array<number>} TileCoord\n * @api\n */\n\n\n/**\n * @param {number} z Z.\n * @param {number} x X.\n * @param {number} y Y.\n * @param {TileCoord=} opt_tileCoord Tile coordinate.\n * @return {TileCoord} Tile coordinate.\n */\nexport function createOrUpdate(z, x, y, opt_tileCoord) {\n  if (opt_tileCoord !== undefined) {\n    opt_tileCoord[0] = z;\n    opt_tileCoord[1] = x;\n    opt_tileCoord[2] = y;\n    return opt_tileCoord;\n  } else {\n    return [z, x, y];\n  }\n}\n\n\n/**\n * @param {number} z Z.\n * @param {number} x X.\n * @param {number} y Y.\n * @return {string} Key.\n */\nexport function getKeyZXY(z, x, y) {\n  return z + '/' + x + '/' + y;\n}\n\n\n/**\n * Get the key for a tile coord.\n * @param {TileCoord} tileCoord The tile coord.\n * @return {string} Key.\n */\nexport function getKey(tileCoord) {\n  return getKeyZXY(tileCoord[0], tileCoord[1], tileCoord[2]);\n}\n\n\n/**\n * Get a tile coord given a key.\n * @param {string} key The tile coord key.\n * @return {TileCoord} The tile coord.\n */\nexport function fromKey(key) {\n  return key.split('/').map(Number);\n}\n\n\n/**\n * @param {TileCoord} tileCoord Tile coord.\n * @return {number} Hash.\n */\nexport function hash(tileCoord) {\n  return (tileCoord[1] << tileCoord[0]) + tileCoord[2];\n}\n\n\n/**\n * @param {TileCoord} tileCoord Tile coord.\n * @return {string} Quad key.\n */\nexport function quadKey(tileCoord) {\n  const z = tileCoord[0];\n  const digits = new Array(z);\n  let mask = 1 << (z - 1);\n  let i, charCode;\n  for (i = 0; i < z; ++i) {\n    // 48 is charCode for 0 - '0'.charCodeAt(0)\n    charCode = 48;\n    if (tileCoord[1] & mask) {\n      charCode += 1;\n    }\n    if (tileCoord[2] & mask) {\n      charCode += 2;\n    }\n    digits[i] = String.fromCharCode(charCode);\n    mask >>= 1;\n  }\n  return digits.join('');\n}\n\n\n/**\n * @param {TileCoord} tileCoord Tile coordinate.\n * @param {!import(\"./tilegrid/TileGrid.js\").default} tileGrid Tile grid.\n * @return {boolean} Tile coordinate is within extent and zoom level range.\n */\nexport function withinExtentAndZ(tileCoord, tileGrid) {\n  const z = tileCoord[0];\n  const x = tileCoord[1];\n  const y = tileCoord[2];\n\n  if (tileGrid.getMinZoom() > z || z > tileGrid.getMaxZoom()) {\n    return false;\n  }\n  const extent = tileGrid.getExtent();\n  let tileRange;\n  if (!extent) {\n    tileRange = tileGrid.getFullTileRange(z);\n  } else {\n    tileRange = tileGrid.getTileRangeForExtentAndZ(extent, z);\n  }\n  if (!tileRange) {\n    return true;\n  } else {\n    return tileRange.containsXY(x, y);\n  }\n}\n","/**\n * @module ol/tileurlfunction\n */\nimport {assert} from './asserts.js';\nimport {modulo} from './math.js';\nimport {hash as tileCoordHash} from './tilecoord.js';\n\n\n/**\n * @param {string} template Template.\n * @param {import(\"./tilegrid/TileGrid.js\").default} tileGrid Tile grid.\n * @return {import(\"./Tile.js\").UrlFunction} Tile URL function.\n */\nexport function createFromTemplate(template, tileGrid) {\n  const zRegEx = /\\{z\\}/g;\n  const xRegEx = /\\{x\\}/g;\n  const yRegEx = /\\{y\\}/g;\n  const dashYRegEx = /\\{-y\\}/g;\n  return (\n    /**\n     * @param {import(\"./tilecoord.js\").TileCoord} tileCoord Tile Coordinate.\n     * @param {number} pixelRatio Pixel ratio.\n     * @param {import(\"./proj/Projection.js\").default} projection Projection.\n     * @return {string|undefined} Tile URL.\n     */\n    function(tileCoord, pixelRatio, projection) {\n      if (!tileCoord) {\n        return undefined;\n      } else {\n        return template.replace(zRegEx, tileCoord[0].toString())\n          .replace(xRegEx, tileCoord[1].toString())\n          .replace(yRegEx, function() {\n            const y = -tileCoord[2] - 1;\n            return y.toString();\n          })\n          .replace(dashYRegEx, function() {\n            const z = tileCoord[0];\n            const range = tileGrid.getFullTileRange(z);\n            assert(range, 55); // The {-y} placeholder requires a tile grid with extent\n            const y = range.getHeight() + tileCoord[2];\n            return y.toString();\n          });\n      }\n    }\n  );\n}\n\n\n/**\n * @param {Array<string>} templates Templates.\n * @param {import(\"./tilegrid/TileGrid.js\").default} tileGrid Tile grid.\n * @return {import(\"./Tile.js\").UrlFunction} Tile URL function.\n */\nexport function createFromTemplates(templates, tileGrid) {\n  const len = templates.length;\n  const tileUrlFunctions = new Array(len);\n  for (let i = 0; i < len; ++i) {\n    tileUrlFunctions[i] = createFromTemplate(templates[i], tileGrid);\n  }\n  return createFromTileUrlFunctions(tileUrlFunctions);\n}\n\n\n/**\n * @param {Array<import(\"./Tile.js\").UrlFunction>} tileUrlFunctions Tile URL Functions.\n * @return {import(\"./Tile.js\").UrlFunction} Tile URL function.\n */\nexport function createFromTileUrlFunctions(tileUrlFunctions) {\n  if (tileUrlFunctions.length === 1) {\n    return tileUrlFunctions[0];\n  }\n  return (\n    /**\n     * @param {import(\"./tilecoord.js\").TileCoord} tileCoord Tile Coordinate.\n     * @param {number} pixelRatio Pixel ratio.\n     * @param {import(\"./proj/Projection.js\").default} projection Projection.\n     * @return {string|undefined} Tile URL.\n     */\n    function(tileCoord, pixelRatio, projection) {\n      if (!tileCoord) {\n        return undefined;\n      } else {\n        const h = tileCoordHash(tileCoord);\n        const index = modulo(h, tileUrlFunctions.length);\n        return tileUrlFunctions[index](tileCoord, pixelRatio, projection);\n      }\n    }\n  );\n}\n\n\n/**\n * @param {import(\"./tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n * @param {number} pixelRatio Pixel ratio.\n * @param {import(\"./proj/Projection.js\").default} projection Projection.\n * @return {string|undefined} Tile URL.\n */\nexport function nullTileUrlFunction(tileCoord, pixelRatio, projection) {\n  return undefined;\n}\n\n\n/**\n * @param {string} url URL.\n * @return {Array<string>} Array of urls.\n */\nexport function expandUrl(url) {\n  const urls = [];\n  let match = /\\{([a-z])-([a-z])\\}/.exec(url);\n  if (match) {\n    // char range\n    const startCharCode = match[1].charCodeAt(0);\n    const stopCharCode = match[2].charCodeAt(0);\n    let charCode;\n    for (charCode = startCharCode; charCode <= stopCharCode; ++charCode) {\n      urls.push(url.replace(match[0], String.fromCharCode(charCode)));\n    }\n    return urls;\n  }\n  match = match = /\\{(\\d+)-(\\d+)\\}/.exec(url);\n  if (match) {\n    // number range\n    const stop = parseInt(match[2], 10);\n    for (let i = parseInt(match[1], 10); i <= stop; i++) {\n      urls.push(url.replace(match[0], i.toString()));\n    }\n    return urls;\n  }\n  urls.push(url);\n  return urls;\n}\n","/**\n * @module ol/Tile\n */\nimport TileState from './TileState.js';\nimport {easeIn} from './easing.js';\nimport EventTarget from './events/Target.js';\nimport EventType from './events/EventType.js';\n\n\n/**\n * A function that takes an {@link module:ol/Tile} for the tile and a\n * `{string}` for the url as arguments. The default is\n * ```js\n * source.setTileLoadFunction(function(tile, src) {\n *   tile.getImage().src = src;\n * });\n * ```\n * For more fine grained control, the load function can use fetch or XMLHttpRequest and involve\n * error handling:\n *\n * ```js\n * import TileState from 'ol/TileState';\n *\n * source.setTileLoadFunction(function(tile, src) {\n *   var xhr = new XMLHttpRequest();\n *   xhr.responseType = 'blob';\n *   xhr.addEventListener('loadend', function (evt) {\n *     var data = this.response;\n *     if (data !== undefined) {\n *       tile.getImage().src = URL.createObjectURL(data);\n *     } else {\n *       tile.setState(TileState.ERROR);\n *     }\n *   });\n *   xhr.addEventListener('error', function () {\n *     tile.setState(TileState.ERROR);\n *   });\n *   xhr.open('GET', src);\n *   xhr.send();\n * });\n * ```\n *\n * @typedef {function(Tile, string)} LoadFunction\n * @api\n */\n\n/**\n * {@link module:ol/source/Tile~Tile} sources use a function of this type to get\n * the url that provides a tile for a given tile coordinate.\n *\n * This function takes an {@link module:ol/tilecoord~TileCoord} for the tile\n * coordinate, a `{number}` representing the pixel ratio and a\n * {@link module:ol/proj/Projection} for the projection  as arguments\n * and returns a `{string}` representing the tile URL, or undefined if no tile\n * should be requested for the passed tile coordinate.\n *\n * @typedef {function(import(\"./tilecoord.js\").TileCoord, number,\n *           import(\"./proj/Projection.js\").default): (string|undefined)} UrlFunction\n * @api\n */\n\n\n/**\n * @typedef {Object} Options\n * @property {number} [transition=250] A duration for tile opacity\n * transitions in milliseconds. A duration of 0 disables the opacity transition.\n * @api\n */\n\n\n/**\n * @classdesc\n * Base class for tiles.\n *\n * @abstract\n */\nclass Tile extends EventTarget {\n\n  /**\n   * @param {import(\"./tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n   * @param {TileState} state State.\n   * @param {Options=} opt_options Tile options.\n   */\n  constructor(tileCoord, state, opt_options) {\n    super();\n\n    const options = opt_options ? opt_options : {};\n\n    /**\n     * @type {import(\"./tilecoord.js\").TileCoord}\n     */\n    this.tileCoord = tileCoord;\n\n    /**\n     * @protected\n     * @type {TileState}\n     */\n    this.state = state;\n\n    /**\n     * An \"interim\" tile for this tile. The interim tile may be used while this\n     * one is loading, for \"smooth\" transitions when changing params/dimensions\n     * on the source.\n     * @type {Tile}\n     */\n    this.interimTile = null;\n\n    /**\n     * A key assigned to the tile. This is used by the tile source to determine\n     * if this tile can effectively be used, or if a new tile should be created\n     * and this one be used as an interim tile for this new tile.\n     * @type {string}\n     */\n    this.key = '';\n\n    /**\n     * The duration for the opacity transition.\n     * @type {number}\n     */\n    this.transition_ = options.transition === undefined ? 250 : options.transition;\n\n    /**\n     * Lookup of start times for rendering transitions.  If the start time is\n     * equal to -1, the transition is complete.\n     * @type {Object<string, number>}\n     */\n    this.transitionStarts_ = {};\n\n  }\n\n  /**\n   * @protected\n   */\n  changed() {\n    this.dispatchEvent(EventType.CHANGE);\n  }\n\n  /**\n   * @return {string} Key.\n   */\n  getKey() {\n    return this.key + '/' + this.tileCoord;\n  }\n\n  /**\n   * Get the interim tile most suitable for rendering using the chain of interim\n   * tiles. This corresponds to the  most recent tile that has been loaded, if no\n   * such tile exists, the original tile is returned.\n   * @return {!Tile} Best tile for rendering.\n   */\n  getInterimTile() {\n    if (!this.interimTile) {\n      //empty chain\n      return this;\n    }\n    let tile = this.interimTile;\n\n    // find the first loaded tile and return it. Since the chain is sorted in\n    // decreasing order of creation time, there is no need to search the remainder\n    // of the list (all those tiles correspond to older requests and will be\n    // cleaned up by refreshInterimChain)\n    do {\n      if (tile.getState() == TileState.LOADED) {\n        return tile;\n      }\n      tile = tile.interimTile;\n    } while (tile);\n\n    // we can not find a better tile\n    return this;\n  }\n\n  /**\n   * Goes through the chain of interim tiles and discards sections of the chain\n   * that are no longer relevant.\n   */\n  refreshInterimChain() {\n    if (!this.interimTile) {\n      return;\n    }\n\n    let tile = this.interimTile;\n    let prev = /** @type {Tile} */ (this);\n\n    do {\n      if (tile.getState() == TileState.LOADED) {\n        //we have a loaded tile, we can discard the rest of the list\n        //we would could abort any LOADING tile request\n        //older than this tile (i.e. any LOADING tile following this entry in the chain)\n        tile.interimTile = null;\n        break;\n      } else if (tile.getState() == TileState.LOADING) {\n        //keep this LOADING tile any loaded tiles later in the chain are\n        //older than this tile, so we're still interested in the request\n        prev = tile;\n      } else if (tile.getState() == TileState.IDLE) {\n        //the head of the list is the most current tile, we don't need\n        //to start any other requests for this chain\n        prev.interimTile = tile.interimTile;\n      } else {\n        prev = tile;\n      }\n      tile = prev.interimTile;\n    } while (tile);\n  }\n\n  /**\n   * Get the tile coordinate for this tile.\n   * @return {import(\"./tilecoord.js\").TileCoord} The tile coordinate.\n   * @api\n   */\n  getTileCoord() {\n    return this.tileCoord;\n  }\n\n  /**\n   * @return {TileState} State.\n   */\n  getState() {\n    return this.state;\n  }\n\n  /**\n   * Sets the state of this tile. If you write your own {@link module:ol/Tile~LoadFunction tileLoadFunction} ,\n   * it is important to set the state correctly to {@link module:ol/TileState~ERROR}\n   * when the tile cannot be loaded. Otherwise the tile cannot be removed from\n   * the tile queue and will block other requests.\n   * @param {TileState} state State.\n   * @api\n   */\n  setState(state) {\n    this.state = state;\n    this.changed();\n  }\n\n  /**\n   * Load the image or retry if loading previously failed.\n   * Loading is taken care of by the tile queue, and calling this method is\n   * only needed for preloading or for reloading in case of an error.\n   * @abstract\n   * @api\n   */\n  load() {}\n\n  /**\n   * Get the alpha value for rendering.\n   * @param {string} id An id for the renderer.\n   * @param {number} time The render frame time.\n   * @return {number} A number between 0 and 1.\n   */\n  getAlpha(id, time) {\n    if (!this.transition_) {\n      return 1;\n    }\n\n    let start = this.transitionStarts_[id];\n    if (!start) {\n      start = time;\n      this.transitionStarts_[id] = start;\n    } else if (start === -1) {\n      return 1;\n    }\n\n    const delta = time - start + (1000 / 60); // avoid rendering at 0\n    if (delta >= this.transition_) {\n      return 1;\n    }\n    return easeIn(delta / this.transition_);\n  }\n\n  /**\n   * Determine if a tile is in an alpha transition.  A tile is considered in\n   * transition if tile.getAlpha() has not yet been called or has been called\n   * and returned 1.\n   * @param {string} id An id for the renderer.\n   * @return {boolean} The tile is in transition.\n   */\n  inTransition(id) {\n    if (!this.transition_) {\n      return false;\n    }\n    return this.transitionStarts_[id] !== -1;\n  }\n\n  /**\n   * Mark a transition as complete.\n   * @param {string} id An id for the renderer.\n   */\n  endTransition(id) {\n    if (this.transition_) {\n      this.transitionStarts_[id] = -1;\n    }\n  }\n}\n\n\nexport default Tile;\n","/**\n * @module ol/ImageTile\n */\nimport Tile from './Tile.js';\nimport TileState from './TileState.js';\nimport {createCanvasContext2D} from './dom.js';\nimport {listenOnce, unlistenByKey} from './events.js';\nimport EventType from './events/EventType.js';\n\n\nclass ImageTile extends Tile {\n\n  /**\n   * @param {import(\"./tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n   * @param {TileState} state State.\n   * @param {string} src Image source URI.\n   * @param {?string} crossOrigin Cross origin.\n   * @param {import(\"./Tile.js\").LoadFunction} tileLoadFunction Tile load function.\n   * @param {import(\"./Tile.js\").Options=} opt_options Tile options.\n   */\n  constructor(tileCoord, state, src, crossOrigin, tileLoadFunction, opt_options) {\n\n    super(tileCoord, state, opt_options);\n\n    /**\n     * @private\n     * @type {?string}\n     */\n    this.crossOrigin_ = crossOrigin;\n\n    /**\n     * Image URI\n     *\n     * @private\n     * @type {string}\n     */\n    this.src_ = src;\n\n    /**\n     * @private\n     * @type {HTMLImageElement|HTMLCanvasElement}\n     */\n    this.image_ = new Image();\n    if (crossOrigin !== null) {\n      this.image_.crossOrigin = crossOrigin;\n    }\n\n    /**\n     * @private\n     * @type {Array<import(\"./events.js\").EventsKey>}\n     */\n    this.imageListenerKeys_ = null;\n\n    /**\n     * @private\n     * @type {import(\"./Tile.js\").LoadFunction}\n     */\n    this.tileLoadFunction_ = tileLoadFunction;\n\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    if (this.state == TileState.LOADING) {\n      this.unlistenImage_();\n      this.image_ = getBlankImage();\n    }\n    if (this.interimTile) {\n      this.interimTile.dispose();\n    }\n    this.state = TileState.ABORT;\n    this.changed();\n    super.disposeInternal();\n  }\n\n  /**\n   * Get the HTML image element for this tile (may be a Canvas, Image, or Video).\n   * @return {HTMLCanvasElement|HTMLImageElement|HTMLVideoElement} Image.\n   * @api\n   */\n  getImage() {\n    return this.image_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getKey() {\n    return this.src_;\n  }\n\n  /**\n   * Tracks loading or read errors.\n   *\n   * @private\n   */\n  handleImageError_() {\n    this.state = TileState.ERROR;\n    this.unlistenImage_();\n    this.image_ = getBlankImage();\n    this.changed();\n  }\n\n  /**\n   * Tracks successful image load.\n   *\n   * @private\n   */\n  handleImageLoad_() {\n    const image = /** @type {HTMLImageElement} */ (this.image_);\n    if (image.naturalWidth && image.naturalHeight) {\n      this.state = TileState.LOADED;\n    } else {\n      this.state = TileState.EMPTY;\n    }\n    this.unlistenImage_();\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   * @api\n   */\n  load() {\n    if (this.state == TileState.ERROR) {\n      this.state = TileState.IDLE;\n      this.image_ = new Image();\n      if (this.crossOrigin_ !== null) {\n        this.image_.crossOrigin = this.crossOrigin_;\n      }\n    }\n    if (this.state == TileState.IDLE) {\n      this.state = TileState.LOADING;\n      this.changed();\n      this.imageListenerKeys_ = [\n        listenOnce(this.image_, EventType.ERROR,\n          this.handleImageError_, this),\n        listenOnce(this.image_, EventType.LOAD,\n          this.handleImageLoad_, this)\n      ];\n      this.tileLoadFunction_(this, this.src_);\n    }\n  }\n\n  /**\n   * Discards event handlers which listen for load completion or errors.\n   *\n   * @private\n   */\n  unlistenImage_() {\n    this.imageListenerKeys_.forEach(unlistenByKey);\n    this.imageListenerKeys_ = null;\n  }\n}\n\n\n/**\n * Get a 1-pixel blank image.\n * @return {HTMLCanvasElement} Blank image.\n */\nfunction getBlankImage() {\n  const ctx = createCanvasContext2D(1, 1);\n  ctx.fillStyle = 'rgba(0,0,0,0)';\n  ctx.fillRect(0, 0, 1, 1);\n  return ctx.canvas;\n}\n\nexport default ImageTile;\n","/**\n * @module ol/TileCache\n */\nimport LRUCache from './structs/LRUCache.js';\nimport {fromKey, getKey} from './tilecoord.js';\n\nclass TileCache extends LRUCache {\n\n  /**\n   * @param {number=} opt_highWaterMark High water mark.\n   */\n  constructor(opt_highWaterMark) {\n\n    super(opt_highWaterMark);\n\n  }\n\n  /**\n   * @param {!Object<string, import(\"./TileRange.js\").default>} usedTiles Used tiles.\n   */\n  expireCache(usedTiles) {\n    while (this.canExpireCache()) {\n      const tile = this.peekLast();\n      const zKey = tile.tileCoord[0].toString();\n      if (zKey in usedTiles && usedTiles[zKey].contains(tile.tileCoord)) {\n        break;\n      } else {\n        this.pop().dispose();\n      }\n    }\n  }\n\n  /**\n   * Prune all tiles from the cache that don't have the same z as the newest tile.\n   */\n  pruneExceptNewestZ() {\n    if (this.getCount() === 0) {\n      return;\n    }\n    const key = this.peekFirstKey();\n    const tileCoord = fromKey(key);\n    const z = tileCoord[0];\n    this.forEach(function(tile) {\n      if (tile.tileCoord[0] !== z) {\n        this.remove(getKey(tile.tileCoord));\n        tile.dispose();\n      }\n    }, this);\n  }\n}\n\n\nexport default TileCache;\n","/**\n * @module ol/reproj\n */\nimport {createCanvasContext2D} from './dom.js';\nimport {containsCoordinate, createEmpty, extend, getHeight, getTopLeft, getWidth} from './extent.js';\nimport {solveLinearSystem} from './math.js';\nimport {getPointResolution, transform} from './proj.js';\n\n\n/**\n * Calculates ideal resolution to use from the source in order to achieve\n * pixel mapping as close as possible to 1:1 during reprojection.\n * The resolution is calculated regardless of what resolutions\n * are actually available in the dataset (TileGrid, Image, ...).\n *\n * @param {import(\"./proj/Projection.js\").default} sourceProj Source projection.\n * @param {import(\"./proj/Projection.js\").default} targetProj Target projection.\n * @param {import(\"./coordinate.js\").Coordinate} targetCenter Target center.\n * @param {number} targetResolution Target resolution.\n * @return {number} The best resolution to use. Can be +-Infinity, NaN or 0.\n */\nexport function calculateSourceResolution(sourceProj, targetProj,\n  targetCenter, targetResolution) {\n\n  const sourceCenter = transform(targetCenter, targetProj, sourceProj);\n\n  // calculate the ideal resolution of the source data\n  let sourceResolution = getPointResolution(targetProj, targetResolution, targetCenter);\n\n  const targetMetersPerUnit = targetProj.getMetersPerUnit();\n  if (targetMetersPerUnit !== undefined) {\n    sourceResolution *= targetMetersPerUnit;\n  }\n  const sourceMetersPerUnit = sourceProj.getMetersPerUnit();\n  if (sourceMetersPerUnit !== undefined) {\n    sourceResolution /= sourceMetersPerUnit;\n  }\n\n  // Based on the projection properties, the point resolution at the specified\n  // coordinates may be slightly different. We need to reverse-compensate this\n  // in order to achieve optimal results.\n\n  const sourceExtent = sourceProj.getExtent();\n  if (!sourceExtent || containsCoordinate(sourceExtent, sourceCenter)) {\n    const compensationFactor = getPointResolution(sourceProj, sourceResolution, sourceCenter) /\n        sourceResolution;\n    if (isFinite(compensationFactor) && compensationFactor > 0) {\n      sourceResolution /= compensationFactor;\n    }\n  }\n\n  return sourceResolution;\n}\n\n\n/**\n * Enlarge the clipping triangle point by 1 pixel to ensure the edges overlap\n * in order to mask gaps caused by antialiasing.\n *\n * @param {number} centroidX Centroid of the triangle (x coordinate in pixels).\n * @param {number} centroidY Centroid of the triangle (y coordinate in pixels).\n * @param {number} x X coordinate of the point (in pixels).\n * @param {number} y Y coordinate of the point (in pixels).\n * @return {import(\"./coordinate.js\").Coordinate} New point 1 px farther from the centroid.\n */\nfunction enlargeClipPoint(centroidX, centroidY, x, y) {\n  const dX = x - centroidX;\n  const dY = y - centroidY;\n  const distance = Math.sqrt(dX * dX + dY * dY);\n  return [Math.round(x + dX / distance), Math.round(y + dY / distance)];\n}\n\n\n/**\n * Renders the source data into new canvas based on the triangulation.\n *\n * @param {number} width Width of the canvas.\n * @param {number} height Height of the canvas.\n * @param {number} pixelRatio Pixel ratio.\n * @param {number} sourceResolution Source resolution.\n * @param {import(\"./extent.js\").Extent} sourceExtent Extent of the data source.\n * @param {number} targetResolution Target resolution.\n * @param {import(\"./extent.js\").Extent} targetExtent Target extent.\n * @param {import(\"./reproj/Triangulation.js\").default} triangulation\n * Calculated triangulation.\n * @param {Array<{extent: import(\"./extent.js\").Extent,\n *                 image: (HTMLCanvasElement|HTMLImageElement|HTMLVideoElement)}>} sources\n * Array of sources.\n * @param {number} gutter Gutter of the sources.\n * @param {boolean=} opt_renderEdges Render reprojection edges.\n * @return {HTMLCanvasElement} Canvas with reprojected data.\n */\nexport function render(width, height, pixelRatio,\n  sourceResolution, sourceExtent, targetResolution, targetExtent,\n  triangulation, sources, gutter, opt_renderEdges) {\n\n  const context = createCanvasContext2D(Math.round(pixelRatio * width),\n    Math.round(pixelRatio * height));\n\n  if (sources.length === 0) {\n    return context.canvas;\n  }\n\n  context.scale(pixelRatio, pixelRatio);\n\n  const sourceDataExtent = createEmpty();\n  sources.forEach(function(src, i, arr) {\n    extend(sourceDataExtent, src.extent);\n  });\n\n  const canvasWidthInUnits = getWidth(sourceDataExtent);\n  const canvasHeightInUnits = getHeight(sourceDataExtent);\n  const stitchContext = createCanvasContext2D(\n    Math.round(pixelRatio * canvasWidthInUnits / sourceResolution),\n    Math.round(pixelRatio * canvasHeightInUnits / sourceResolution));\n\n  const stitchScale = pixelRatio / sourceResolution;\n\n  sources.forEach(function(src, i, arr) {\n    const xPos = src.extent[0] - sourceDataExtent[0];\n    const yPos = -(src.extent[3] - sourceDataExtent[3]);\n    const srcWidth = getWidth(src.extent);\n    const srcHeight = getHeight(src.extent);\n\n    stitchContext.drawImage(\n      src.image,\n      gutter, gutter,\n      src.image.width - 2 * gutter, src.image.height - 2 * gutter,\n      xPos * stitchScale, yPos * stitchScale,\n      srcWidth * stitchScale, srcHeight * stitchScale);\n  });\n\n  const targetTopLeft = getTopLeft(targetExtent);\n\n  triangulation.getTriangles().forEach(function(triangle, i, arr) {\n    /* Calculate affine transform (src -> dst)\n     * Resulting matrix can be used to transform coordinate\n     * from `sourceProjection` to destination pixels.\n     *\n     * To optimize number of context calls and increase numerical stability,\n     * we also do the following operations:\n     * trans(-topLeftExtentCorner), scale(1 / targetResolution), scale(1, -1)\n     * here before solving the linear system so [ui, vi] are pixel coordinates.\n     *\n     * Src points: xi, yi\n     * Dst points: ui, vi\n     * Affine coefficients: aij\n     *\n     * | x0 y0 1  0  0 0 |   |a00|   |u0|\n     * | x1 y1 1  0  0 0 |   |a01|   |u1|\n     * | x2 y2 1  0  0 0 | x |a02| = |u2|\n     * |  0  0 0 x0 y0 1 |   |a10|   |v0|\n     * |  0  0 0 x1 y1 1 |   |a11|   |v1|\n     * |  0  0 0 x2 y2 1 |   |a12|   |v2|\n     */\n    const source = triangle.source;\n    const target = triangle.target;\n    let x0 = source[0][0], y0 = source[0][1];\n    let x1 = source[1][0], y1 = source[1][1];\n    let x2 = source[2][0], y2 = source[2][1];\n    const u0 = (target[0][0] - targetTopLeft[0]) / targetResolution;\n    const v0 = -(target[0][1] - targetTopLeft[1]) / targetResolution;\n    const u1 = (target[1][0] - targetTopLeft[0]) / targetResolution;\n    const v1 = -(target[1][1] - targetTopLeft[1]) / targetResolution;\n    const u2 = (target[2][0] - targetTopLeft[0]) / targetResolution;\n    const v2 = -(target[2][1] - targetTopLeft[1]) / targetResolution;\n\n    // Shift all the source points to improve numerical stability\n    // of all the subsequent calculations. The [x0, y0] is used here.\n    // This is also used to simplify the linear system.\n    const sourceNumericalShiftX = x0;\n    const sourceNumericalShiftY = y0;\n    x0 = 0;\n    y0 = 0;\n    x1 -= sourceNumericalShiftX;\n    y1 -= sourceNumericalShiftY;\n    x2 -= sourceNumericalShiftX;\n    y2 -= sourceNumericalShiftY;\n\n    const augmentedMatrix = [\n      [x1, y1, 0, 0, u1 - u0],\n      [x2, y2, 0, 0, u2 - u0],\n      [0, 0, x1, y1, v1 - v0],\n      [0, 0, x2, y2, v2 - v0]\n    ];\n    const affineCoefs = solveLinearSystem(augmentedMatrix);\n    if (!affineCoefs) {\n      return;\n    }\n\n    context.save();\n    context.beginPath();\n    const centroidX = (u0 + u1 + u2) / 3;\n    const centroidY = (v0 + v1 + v2) / 3;\n    const p0 = enlargeClipPoint(centroidX, centroidY, u0, v0);\n    const p1 = enlargeClipPoint(centroidX, centroidY, u1, v1);\n    const p2 = enlargeClipPoint(centroidX, centroidY, u2, v2);\n\n    context.moveTo(p1[0], p1[1]);\n    context.lineTo(p0[0], p0[1]);\n    context.lineTo(p2[0], p2[1]);\n    context.clip();\n\n    context.transform(\n      affineCoefs[0], affineCoefs[2], affineCoefs[1], affineCoefs[3], u0, v0);\n\n    context.translate(sourceDataExtent[0] - sourceNumericalShiftX,\n      sourceDataExtent[3] - sourceNumericalShiftY);\n\n    context.scale(sourceResolution / pixelRatio,\n      -sourceResolution / pixelRatio);\n\n    context.drawImage(stitchContext.canvas, 0, 0);\n    context.restore();\n  });\n\n  if (opt_renderEdges) {\n    context.save();\n\n    context.strokeStyle = 'black';\n    context.lineWidth = 1;\n\n    triangulation.getTriangles().forEach(function(triangle, i, arr) {\n      const target = triangle.target;\n      const u0 = (target[0][0] - targetTopLeft[0]) / targetResolution;\n      const v0 = -(target[0][1] - targetTopLeft[1]) / targetResolution;\n      const u1 = (target[1][0] - targetTopLeft[0]) / targetResolution;\n      const v1 = -(target[1][1] - targetTopLeft[1]) / targetResolution;\n      const u2 = (target[2][0] - targetTopLeft[0]) / targetResolution;\n      const v2 = -(target[2][1] - targetTopLeft[1]) / targetResolution;\n\n      context.beginPath();\n      context.moveTo(u1, v1);\n      context.lineTo(u0, v0);\n      context.lineTo(u2, v2);\n      context.closePath();\n      context.stroke();\n    });\n\n    context.restore();\n  }\n  return context.canvas;\n}\n","/**\n * @module ol/reproj/Triangulation\n */\nimport {boundingExtent, createEmpty, extendCoordinate, getBottomLeft, getBottomRight,\n  getTopLeft, getTopRight, getWidth, intersects} from '../extent.js';\nimport {modulo} from '../math.js';\nimport {getTransform} from '../proj.js';\n\n\n/**\n * Single triangle; consists of 3 source points and 3 target points.\n * @typedef {Object} Triangle\n * @property {Array<import(\"../coordinate.js\").Coordinate>} source\n * @property {Array<import(\"../coordinate.js\").Coordinate>} target\n */\n\n\n/**\n * Maximum number of subdivision steps during raster reprojection triangulation.\n * Prevents high memory usage and large number of proj4 calls (for certain\n * transformations and areas). At most `2*(2^this)` triangles are created for\n * each triangulated extent (tile/image).\n * @type {number}\n */\nconst MAX_SUBDIVISION = 10;\n\n\n/**\n * Maximum allowed size of triangle relative to world width. When transforming\n * corners of world extent between certain projections, the resulting\n * triangulation seems to have zero error and no subdivision is performed. If\n * the triangle width is more than this (relative to world width; 0-1),\n * subdivison is forced (up to `MAX_SUBDIVISION`). Default is `0.25`.\n * @type {number}\n */\nconst MAX_TRIANGLE_WIDTH = 0.25;\n\n\n/**\n * @classdesc\n * Class containing triangulation of the given target extent.\n * Used for determining source data and the reprojection itself.\n */\nclass Triangulation {\n\n  /**\n   * @param {import(\"../proj/Projection.js\").default} sourceProj Source projection.\n   * @param {import(\"../proj/Projection.js\").default} targetProj Target projection.\n   * @param {import(\"../extent.js\").Extent} targetExtent Target extent to triangulate.\n   * @param {import(\"../extent.js\").Extent} maxSourceExtent Maximal source extent that can be used.\n   * @param {number} errorThreshold Acceptable error (in source units).\n   */\n  constructor(sourceProj, targetProj, targetExtent, maxSourceExtent, errorThreshold) {\n\n    /**\n     * @type {import(\"../proj/Projection.js\").default}\n     * @private\n     */\n    this.sourceProj_ = sourceProj;\n\n    /**\n     * @type {import(\"../proj/Projection.js\").default}\n     * @private\n     */\n    this.targetProj_ = targetProj;\n\n    /** @type {!Object<string, import(\"../coordinate.js\").Coordinate>} */\n    let transformInvCache = {};\n    const transformInv = getTransform(this.targetProj_, this.sourceProj_);\n\n    /**\n     * @param {import(\"../coordinate.js\").Coordinate} c A coordinate.\n     * @return {import(\"../coordinate.js\").Coordinate} Transformed coordinate.\n     * @private\n     */\n    this.transformInv_ = function(c) {\n      const key = c[0] + '/' + c[1];\n      if (!transformInvCache[key]) {\n        transformInvCache[key] = transformInv(c);\n      }\n      return transformInvCache[key];\n    };\n\n    /**\n     * @type {import(\"../extent.js\").Extent}\n     * @private\n     */\n    this.maxSourceExtent_ = maxSourceExtent;\n\n    /**\n     * @type {number}\n     * @private\n     */\n    this.errorThresholdSquared_ = errorThreshold * errorThreshold;\n\n    /**\n     * @type {Array<Triangle>}\n     * @private\n     */\n    this.triangles_ = [];\n\n    /**\n     * Indicates that the triangulation crosses edge of the source projection.\n     * @type {boolean}\n     * @private\n     */\n    this.wrapsXInSource_ = false;\n\n    /**\n     * @type {boolean}\n     * @private\n     */\n    this.canWrapXInSource_ = this.sourceProj_.canWrapX() &&\n        !!maxSourceExtent &&\n        !!this.sourceProj_.getExtent() &&\n        (getWidth(maxSourceExtent) == getWidth(this.sourceProj_.getExtent()));\n\n    /**\n     * @type {?number}\n     * @private\n     */\n    this.sourceWorldWidth_ = this.sourceProj_.getExtent() ?\n      getWidth(this.sourceProj_.getExtent()) : null;\n\n    /**\n     * @type {?number}\n     * @private\n     */\n    this.targetWorldWidth_ = this.targetProj_.getExtent() ?\n      getWidth(this.targetProj_.getExtent()) : null;\n\n    const destinationTopLeft = getTopLeft(targetExtent);\n    const destinationTopRight = getTopRight(targetExtent);\n    const destinationBottomRight = getBottomRight(targetExtent);\n    const destinationBottomLeft = getBottomLeft(targetExtent);\n    const sourceTopLeft = this.transformInv_(destinationTopLeft);\n    const sourceTopRight = this.transformInv_(destinationTopRight);\n    const sourceBottomRight = this.transformInv_(destinationBottomRight);\n    const sourceBottomLeft = this.transformInv_(destinationBottomLeft);\n\n    this.addQuad_(\n      destinationTopLeft, destinationTopRight,\n      destinationBottomRight, destinationBottomLeft,\n      sourceTopLeft, sourceTopRight, sourceBottomRight, sourceBottomLeft,\n      MAX_SUBDIVISION);\n\n    if (this.wrapsXInSource_) {\n      let leftBound = Infinity;\n      this.triangles_.forEach(function(triangle, i, arr) {\n        leftBound = Math.min(leftBound,\n          triangle.source[0][0], triangle.source[1][0], triangle.source[2][0]);\n      });\n\n      // Shift triangles to be as close to `leftBound` as possible\n      // (if the distance is more than `worldWidth / 2` it can be closer.\n      this.triangles_.forEach(function(triangle) {\n        if (Math.max(triangle.source[0][0], triangle.source[1][0],\n          triangle.source[2][0]) - leftBound > this.sourceWorldWidth_ / 2) {\n          const newTriangle = [[triangle.source[0][0], triangle.source[0][1]],\n            [triangle.source[1][0], triangle.source[1][1]],\n            [triangle.source[2][0], triangle.source[2][1]]];\n          if ((newTriangle[0][0] - leftBound) > this.sourceWorldWidth_ / 2) {\n            newTriangle[0][0] -= this.sourceWorldWidth_;\n          }\n          if ((newTriangle[1][0] - leftBound) > this.sourceWorldWidth_ / 2) {\n            newTriangle[1][0] -= this.sourceWorldWidth_;\n          }\n          if ((newTriangle[2][0] - leftBound) > this.sourceWorldWidth_ / 2) {\n            newTriangle[2][0] -= this.sourceWorldWidth_;\n          }\n\n          // Rarely (if the extent contains both the dateline and prime meridian)\n          // the shift can in turn break some triangles.\n          // Detect this here and don't shift in such cases.\n          const minX = Math.min(\n            newTriangle[0][0], newTriangle[1][0], newTriangle[2][0]);\n          const maxX = Math.max(\n            newTriangle[0][0], newTriangle[1][0], newTriangle[2][0]);\n          if ((maxX - minX) < this.sourceWorldWidth_ / 2) {\n            triangle.source = newTriangle;\n          }\n        }\n      }.bind(this));\n    }\n\n    transformInvCache = {};\n  }\n\n  /**\n   * Adds triangle to the triangulation.\n   * @param {import(\"../coordinate.js\").Coordinate} a The target a coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} b The target b coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} c The target c coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} aSrc The source a coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} bSrc The source b coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} cSrc The source c coordinate.\n   * @private\n   */\n  addTriangle_(a, b, c, aSrc, bSrc, cSrc) {\n    this.triangles_.push({\n      source: [aSrc, bSrc, cSrc],\n      target: [a, b, c]\n    });\n  }\n\n  /**\n   * Adds quad (points in clock-wise order) to the triangulation\n   * (and reprojects the vertices) if valid.\n   * Performs quad subdivision if needed to increase precision.\n   *\n   * @param {import(\"../coordinate.js\").Coordinate} a The target a coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} b The target b coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} c The target c coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} d The target d coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} aSrc The source a coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} bSrc The source b coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} cSrc The source c coordinate.\n   * @param {import(\"../coordinate.js\").Coordinate} dSrc The source d coordinate.\n   * @param {number} maxSubdivision Maximal allowed subdivision of the quad.\n   * @private\n   */\n  addQuad_(a, b, c, d, aSrc, bSrc, cSrc, dSrc, maxSubdivision) {\n\n    const sourceQuadExtent = boundingExtent([aSrc, bSrc, cSrc, dSrc]);\n    const sourceCoverageX = this.sourceWorldWidth_ ?\n      getWidth(sourceQuadExtent) / this.sourceWorldWidth_ : null;\n    const sourceWorldWidth = /** @type {number} */ (this.sourceWorldWidth_);\n\n    // when the quad is wrapped in the source projection\n    // it covers most of the projection extent, but not fully\n    const wrapsX = this.sourceProj_.canWrapX() &&\n                 sourceCoverageX > 0.5 && sourceCoverageX < 1;\n\n    let needsSubdivision = false;\n\n    if (maxSubdivision > 0) {\n      if (this.targetProj_.isGlobal() && this.targetWorldWidth_) {\n        const targetQuadExtent = boundingExtent([a, b, c, d]);\n        const targetCoverageX = getWidth(targetQuadExtent) / this.targetWorldWidth_;\n        needsSubdivision = targetCoverageX > MAX_TRIANGLE_WIDTH ||\n          needsSubdivision;\n      }\n      if (!wrapsX && this.sourceProj_.isGlobal() && sourceCoverageX) {\n        needsSubdivision = sourceCoverageX > MAX_TRIANGLE_WIDTH ||\n            needsSubdivision;\n      }\n    }\n\n    if (!needsSubdivision && this.maxSourceExtent_) {\n      if (!intersects(sourceQuadExtent, this.maxSourceExtent_)) {\n        // whole quad outside source projection extent -> ignore\n        return;\n      }\n    }\n\n    if (!needsSubdivision) {\n      if (!isFinite(aSrc[0]) || !isFinite(aSrc[1]) ||\n          !isFinite(bSrc[0]) || !isFinite(bSrc[1]) ||\n          !isFinite(cSrc[0]) || !isFinite(cSrc[1]) ||\n          !isFinite(dSrc[0]) || !isFinite(dSrc[1])) {\n        if (maxSubdivision > 0) {\n          needsSubdivision = true;\n        } else {\n          return;\n        }\n      }\n    }\n\n    if (maxSubdivision > 0) {\n      if (!needsSubdivision) {\n        const center = [(a[0] + c[0]) / 2, (a[1] + c[1]) / 2];\n        const centerSrc = this.transformInv_(center);\n\n        let dx;\n        if (wrapsX) {\n          const centerSrcEstimX =\n              (modulo(aSrc[0], sourceWorldWidth) +\n               modulo(cSrc[0], sourceWorldWidth)) / 2;\n          dx = centerSrcEstimX -\n              modulo(centerSrc[0], sourceWorldWidth);\n        } else {\n          dx = (aSrc[0] + cSrc[0]) / 2 - centerSrc[0];\n        }\n        const dy = (aSrc[1] + cSrc[1]) / 2 - centerSrc[1];\n        const centerSrcErrorSquared = dx * dx + dy * dy;\n        needsSubdivision = centerSrcErrorSquared > this.errorThresholdSquared_;\n      }\n      if (needsSubdivision) {\n        if (Math.abs(a[0] - c[0]) <= Math.abs(a[1] - c[1])) {\n          // split horizontally (top & bottom)\n          const bc = [(b[0] + c[0]) / 2, (b[1] + c[1]) / 2];\n          const bcSrc = this.transformInv_(bc);\n          const da = [(d[0] + a[0]) / 2, (d[1] + a[1]) / 2];\n          const daSrc = this.transformInv_(da);\n\n          this.addQuad_(\n            a, b, bc, da, aSrc, bSrc, bcSrc, daSrc, maxSubdivision - 1);\n          this.addQuad_(\n            da, bc, c, d, daSrc, bcSrc, cSrc, dSrc, maxSubdivision - 1);\n        } else {\n          // split vertically (left & right)\n          const ab = [(a[0] + b[0]) / 2, (a[1] + b[1]) / 2];\n          const abSrc = this.transformInv_(ab);\n          const cd = [(c[0] + d[0]) / 2, (c[1] + d[1]) / 2];\n          const cdSrc = this.transformInv_(cd);\n\n          this.addQuad_(\n            a, ab, cd, d, aSrc, abSrc, cdSrc, dSrc, maxSubdivision - 1);\n          this.addQuad_(\n            ab, b, c, cd, abSrc, bSrc, cSrc, cdSrc, maxSubdivision - 1);\n        }\n        return;\n      }\n    }\n\n    if (wrapsX) {\n      if (!this.canWrapXInSource_) {\n        return;\n      }\n      this.wrapsXInSource_ = true;\n    }\n\n    this.addTriangle_(a, c, d, aSrc, cSrc, dSrc);\n    this.addTriangle_(a, b, c, aSrc, bSrc, cSrc);\n  }\n\n  /**\n   * Calculates extent of the 'source' coordinates from all the triangles.\n   *\n   * @return {import(\"../extent.js\").Extent} Calculated extent.\n   */\n  calculateSourceExtent() {\n    const extent = createEmpty();\n\n    this.triangles_.forEach(function(triangle, i, arr) {\n      const src = triangle.source;\n      extendCoordinate(extent, src[0]);\n      extendCoordinate(extent, src[1]);\n      extendCoordinate(extent, src[2]);\n    });\n\n    return extent;\n  }\n\n  /**\n   * @return {Array<Triangle>} Array of the calculated triangles.\n   */\n  getTriangles() {\n    return this.triangles_;\n  }\n}\n\nexport default Triangulation;\n","/**\n * @module ol/reproj/Tile\n */\nimport {ERROR_THRESHOLD} from './common.js';\n\nimport Tile from '../Tile.js';\nimport TileState from '../TileState.js';\nimport {listen, unlistenByKey} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {getArea, getCenter, getIntersection} from '../extent.js';\nimport {clamp} from '../math.js';\nimport {calculateSourceResolution, render as renderReprojected} from '../reproj.js';\nimport Triangulation from './Triangulation.js';\n\n\n/**\n * @typedef {function(number, number, number, number) : import(\"../Tile.js\").default} FunctionType\n */\n\n\n/**\n * @classdesc\n * Class encapsulating single reprojected tile.\n * See {@link module:ol/source/TileImage~TileImage}.\n *\n */\nclass ReprojTile extends Tile {\n  /**\n   * @param {import(\"../proj/Projection.js\").default} sourceProj Source projection.\n   * @param {import(\"../tilegrid/TileGrid.js\").default} sourceTileGrid Source tile grid.\n   * @param {import(\"../proj/Projection.js\").default} targetProj Target projection.\n   * @param {import(\"../tilegrid/TileGrid.js\").default} targetTileGrid Target tile grid.\n   * @param {import(\"../tilecoord.js\").TileCoord} tileCoord Coordinate of the tile.\n   * @param {import(\"../tilecoord.js\").TileCoord} wrappedTileCoord Coordinate of the tile wrapped in X.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {number} gutter Gutter of the source tiles.\n   * @param {FunctionType} getTileFunction\n   *     Function returning source tiles (z, x, y, pixelRatio).\n   * @param {number=} opt_errorThreshold Acceptable reprojection error (in px).\n   * @param {boolean=} opt_renderEdges Render reprojection edges.\n   */\n  constructor(\n    sourceProj,\n    sourceTileGrid,\n    targetProj,\n    targetTileGrid,\n    tileCoord,\n    wrappedTileCoord,\n    pixelRatio,\n    gutter,\n    getTileFunction,\n    opt_errorThreshold,\n    opt_renderEdges\n  ) {\n    super(tileCoord, TileState.IDLE);\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.renderEdges_ = opt_renderEdges !== undefined ? opt_renderEdges : false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.pixelRatio_ = pixelRatio;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.gutter_ = gutter;\n\n    /**\n     * @private\n     * @type {HTMLCanvasElement}\n     */\n    this.canvas_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../tilegrid/TileGrid.js\").default}\n     */\n    this.sourceTileGrid_ = sourceTileGrid;\n\n    /**\n     * @private\n     * @type {import(\"../tilegrid/TileGrid.js\").default}\n     */\n    this.targetTileGrid_ = targetTileGrid;\n\n    /**\n     * @private\n     * @type {import(\"../tilecoord.js\").TileCoord}\n     */\n    this.wrappedTileCoord_ = wrappedTileCoord ? wrappedTileCoord : tileCoord;\n\n    /**\n     * @private\n     * @type {!Array<import(\"../Tile.js\").default>}\n     */\n    this.sourceTiles_ = [];\n\n    /**\n     * @private\n     * @type {Array<import(\"../events.js\").EventsKey>}\n     */\n    this.sourcesListenerKeys_ = null;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.sourceZ_ = 0;\n\n    const targetExtent = targetTileGrid.getTileCoordExtent(this.wrappedTileCoord_);\n    const maxTargetExtent = this.targetTileGrid_.getExtent();\n    let maxSourceExtent = this.sourceTileGrid_.getExtent();\n\n    const limitedTargetExtent = maxTargetExtent ?\n      getIntersection(targetExtent, maxTargetExtent) : targetExtent;\n\n    if (getArea(limitedTargetExtent) === 0) {\n      // Tile is completely outside range -> EMPTY\n      // TODO: is it actually correct that the source even creates the tile ?\n      this.state = TileState.EMPTY;\n      return;\n    }\n\n    const sourceProjExtent = sourceProj.getExtent();\n    if (sourceProjExtent) {\n      if (!maxSourceExtent) {\n        maxSourceExtent = sourceProjExtent;\n      } else {\n        maxSourceExtent = getIntersection(maxSourceExtent, sourceProjExtent);\n      }\n    }\n\n    const targetResolution = targetTileGrid.getResolution(\n      this.wrappedTileCoord_[0]);\n\n    const targetCenter = getCenter(limitedTargetExtent);\n    const sourceResolution = calculateSourceResolution(\n      sourceProj, targetProj, targetCenter, targetResolution);\n\n    if (!isFinite(sourceResolution) || sourceResolution <= 0) {\n      // invalid sourceResolution -> EMPTY\n      // probably edges of the projections when no extent is defined\n      this.state = TileState.EMPTY;\n      return;\n    }\n\n    const errorThresholdInPixels = opt_errorThreshold !== undefined ?\n      opt_errorThreshold : ERROR_THRESHOLD;\n\n    /**\n     * @private\n     * @type {!import(\"./Triangulation.js\").default}\n     */\n    this.triangulation_ = new Triangulation(\n      sourceProj, targetProj, limitedTargetExtent, maxSourceExtent,\n      sourceResolution * errorThresholdInPixels);\n\n    if (this.triangulation_.getTriangles().length === 0) {\n      // no valid triangles -> EMPTY\n      this.state = TileState.EMPTY;\n      return;\n    }\n\n    this.sourceZ_ = sourceTileGrid.getZForResolution(sourceResolution);\n    let sourceExtent = this.triangulation_.calculateSourceExtent();\n\n    if (maxSourceExtent) {\n      if (sourceProj.canWrapX()) {\n        sourceExtent[1] = clamp(\n          sourceExtent[1], maxSourceExtent[1], maxSourceExtent[3]);\n        sourceExtent[3] = clamp(\n          sourceExtent[3], maxSourceExtent[1], maxSourceExtent[3]);\n      } else {\n        sourceExtent = getIntersection(sourceExtent, maxSourceExtent);\n      }\n    }\n\n    if (!getArea(sourceExtent)) {\n      this.state = TileState.EMPTY;\n    } else {\n      const sourceRange = sourceTileGrid.getTileRangeForExtentAndZ(\n        sourceExtent, this.sourceZ_);\n\n      for (let srcX = sourceRange.minX; srcX <= sourceRange.maxX; srcX++) {\n        for (let srcY = sourceRange.minY; srcY <= sourceRange.maxY; srcY++) {\n          const tile = getTileFunction(this.sourceZ_, srcX, srcY, pixelRatio);\n          if (tile) {\n            this.sourceTiles_.push(tile);\n          }\n        }\n      }\n\n      if (this.sourceTiles_.length === 0) {\n        this.state = TileState.EMPTY;\n      }\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  disposeInternal() {\n    if (this.state == TileState.LOADING) {\n      this.unlistenSources_();\n    }\n    super.disposeInternal();\n  }\n\n  /**\n   * Get the HTML Canvas element for this tile.\n   * @return {HTMLCanvasElement} Canvas.\n   */\n  getImage() {\n    return this.canvas_;\n  }\n\n  /**\n   * @private\n   */\n  reproject_() {\n    const sources = [];\n    this.sourceTiles_.forEach(function(tile, i, arr) {\n      if (tile && tile.getState() == TileState.LOADED) {\n        sources.push({\n          extent: this.sourceTileGrid_.getTileCoordExtent(tile.tileCoord),\n          image: tile.getImage()\n        });\n      }\n    }.bind(this));\n    this.sourceTiles_.length = 0;\n\n    if (sources.length === 0) {\n      this.state = TileState.ERROR;\n    } else {\n      const z = this.wrappedTileCoord_[0];\n      const size = this.targetTileGrid_.getTileSize(z);\n      const width = typeof size === 'number' ? size : size[0];\n      const height = typeof size === 'number' ? size : size[1];\n      const targetResolution = this.targetTileGrid_.getResolution(z);\n      const sourceResolution = this.sourceTileGrid_.getResolution(this.sourceZ_);\n\n      const targetExtent = this.targetTileGrid_.getTileCoordExtent(\n        this.wrappedTileCoord_);\n      this.canvas_ = renderReprojected(width, height, this.pixelRatio_,\n        sourceResolution, this.sourceTileGrid_.getExtent(),\n        targetResolution, targetExtent, this.triangulation_, sources,\n        this.gutter_, this.renderEdges_);\n\n      this.state = TileState.LOADED;\n    }\n    this.changed();\n  }\n\n  /**\n   * @inheritDoc\n   */\n  load() {\n    if (this.state == TileState.IDLE) {\n      this.state = TileState.LOADING;\n      this.changed();\n\n      let leftToLoad = 0;\n\n      this.sourcesListenerKeys_ = [];\n      this.sourceTiles_.forEach(function(tile, i, arr) {\n        const state = tile.getState();\n        if (state == TileState.IDLE || state == TileState.LOADING) {\n          leftToLoad++;\n\n          const sourceListenKey = listen(tile, EventType.CHANGE,\n            function(e) {\n              const state = tile.getState();\n              if (state == TileState.LOADED ||\n                    state == TileState.ERROR ||\n                    state == TileState.EMPTY) {\n                unlistenByKey(sourceListenKey);\n                leftToLoad--;\n                if (leftToLoad === 0) {\n                  this.unlistenSources_();\n                  this.reproject_();\n                }\n              }\n            }, this);\n          this.sourcesListenerKeys_.push(sourceListenKey);\n        }\n      }.bind(this));\n\n      this.sourceTiles_.forEach(function(tile, i, arr) {\n        const state = tile.getState();\n        if (state == TileState.IDLE) {\n          tile.load();\n        }\n      });\n\n      if (leftToLoad === 0) {\n        setTimeout(this.reproject_.bind(this), 0);\n      }\n    }\n  }\n\n  /**\n   * @private\n   */\n  unlistenSources_() {\n    this.sourcesListenerKeys_.forEach(unlistenByKey);\n    this.sourcesListenerKeys_ = null;\n  }\n}\n\n\nexport default ReprojTile;\n","/**\n * @module ol/tilegrid/TileGrid\n */\nimport {DEFAULT_TILE_SIZE} from './common.js';\nimport {assert} from '../asserts.js';\nimport TileRange, {createOrUpdate as createOrUpdateTileRange} from '../TileRange.js';\nimport {isSorted, linearFindNearest} from '../array.js';\nimport {createOrUpdate, getTopLeft} from '../extent.js';\nimport {clamp} from '../math.js';\nimport {toSize} from '../size.js';\nimport {createOrUpdate as createOrUpdateTileCoord} from '../tilecoord.js';\n\n\n/**\n * @private\n * @type {import(\"../tilecoord.js\").TileCoord}\n */\nconst tmpTileCoord = [0, 0, 0];\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../extent.js\").Extent} [extent] Extent for the tile grid. No tiles outside this\n * extent will be requested by {@link module:ol/source/Tile} sources. When no `origin` or\n * `origins` are configured, the `origin` will be set to the top-left corner of the extent.\n * @property {number} [minZoom=0] Minimum zoom.\n * @property {import(\"../coordinate.js\").Coordinate} [origin] The tile grid origin, i.e. where the `x`\n * and `y` axes meet (`[z, 0, 0]`). Tile coordinates increase left to right and upwards. If not\n * specified, `extent` or `origins` must be provided.\n * @property {Array<import(\"../coordinate.js\").Coordinate>} [origins] Tile grid origins, i.e. where\n * the `x` and `y` axes meet (`[z, 0, 0]`), for each zoom level. If given, the array length\n * should match the length of the `resolutions` array, i.e. each resolution can have a different\n * origin. Tile coordinates increase left to right and upwards. If not specified, `extent` or\n * `origin` must be provided.\n * @property {!Array<number>} resolutions Resolutions. The array index of each resolution needs\n * to match the zoom level. This means that even if a `minZoom` is configured, the resolutions\n * array will have a length of `maxZoom + 1`.\n * @property {Array<import(\"../size.js\").Size>} [sizes] Sizes.\n * @property {number|import(\"../size.js\").Size} [tileSize] Tile size.\n * Default is `[256, 256]`.\n * @property {Array<import(\"../size.js\").Size>} [tileSizes] Tile sizes. If given, the array length\n * should match the length of the `resolutions` array, i.e. each resolution can have a different\n * tile size.\n */\n\n\n/**\n * @classdesc\n * Base class for setting the grid pattern for sources accessing tiled-image\n * servers.\n * @api\n */\nclass TileGrid {\n  /**\n   * @param {Options} options Tile grid options.\n   */\n  constructor(options) {\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.minZoom = options.minZoom !== undefined ? options.minZoom : 0;\n\n    /**\n     * @private\n     * @type {!Array<number>}\n     */\n    this.resolutions_ = options.resolutions;\n    assert(isSorted(this.resolutions_, function(a, b) {\n      return b - a;\n    }, true), 17); // `resolutions` must be sorted in descending order\n\n\n    // check if we've got a consistent zoom factor and origin\n    let zoomFactor;\n    if (!options.origins) {\n      for (let i = 0, ii = this.resolutions_.length - 1; i < ii; ++i) {\n        if (!zoomFactor) {\n          zoomFactor = this.resolutions_[i] / this.resolutions_[i + 1];\n        } else {\n          if (this.resolutions_[i] / this.resolutions_[i + 1] !== zoomFactor) {\n            zoomFactor = undefined;\n            break;\n          }\n        }\n      }\n    }\n\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.zoomFactor_ = zoomFactor;\n\n\n    /**\n     * @protected\n     * @type {number}\n     */\n    this.maxZoom = this.resolutions_.length - 1;\n\n    /**\n     * @private\n     * @type {import(\"../coordinate.js\").Coordinate}\n     */\n    this.origin_ = options.origin !== undefined ? options.origin : null;\n\n    /**\n     * @private\n     * @type {Array<import(\"../coordinate.js\").Coordinate>}\n     */\n    this.origins_ = null;\n    if (options.origins !== undefined) {\n      this.origins_ = options.origins;\n      assert(this.origins_.length == this.resolutions_.length,\n        20); // Number of `origins` and `resolutions` must be equal\n    }\n\n    const extent = options.extent;\n\n    if (extent !== undefined &&\n        !this.origin_ && !this.origins_) {\n      this.origin_ = getTopLeft(extent);\n    }\n\n    assert(\n      (!this.origin_ && this.origins_) || (this.origin_ && !this.origins_),\n      18); // Either `origin` or `origins` must be configured, never both\n\n    /**\n     * @private\n     * @type {Array<number|import(\"../size.js\").Size>}\n     */\n    this.tileSizes_ = null;\n    if (options.tileSizes !== undefined) {\n      this.tileSizes_ = options.tileSizes;\n      assert(this.tileSizes_.length == this.resolutions_.length,\n        19); // Number of `tileSizes` and `resolutions` must be equal\n    }\n\n    /**\n     * @private\n     * @type {number|import(\"../size.js\").Size}\n     */\n    this.tileSize_ = options.tileSize !== undefined ?\n      options.tileSize :\n      !this.tileSizes_ ? DEFAULT_TILE_SIZE : null;\n    assert(\n      (!this.tileSize_ && this.tileSizes_) ||\n        (this.tileSize_ && !this.tileSizes_),\n      22); // Either `tileSize` or `tileSizes` must be configured, never both\n\n    /**\n     * @private\n     * @type {import(\"../extent.js\").Extent}\n     */\n    this.extent_ = extent !== undefined ? extent : null;\n\n\n    /**\n     * @private\n     * @type {Array<import(\"../TileRange.js\").default>}\n     */\n    this.fullTileRanges_ = null;\n\n    /**\n     * @private\n     * @type {import(\"../size.js\").Size}\n     */\n    this.tmpSize_ = [0, 0];\n\n    if (options.sizes !== undefined) {\n      this.fullTileRanges_ = options.sizes.map(function(size, z) {\n        const tileRange = new TileRange(\n          Math.min(0, size[0]), Math.max(size[0] - 1, -1),\n          Math.min(0, size[1]), Math.max(size[1] - 1, -1));\n        return tileRange;\n      }, this);\n    } else if (extent) {\n      this.calculateTileRanges_(extent);\n    }\n\n  }\n\n  /**\n   * Call a function with each tile coordinate for a given extent and zoom level.\n   *\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @param {number} zoom Integer zoom level.\n   * @param {function(import(\"../tilecoord.js\").TileCoord)} callback Function called with each tile coordinate.\n   * @api\n   */\n  forEachTileCoord(extent, zoom, callback) {\n    const tileRange = this.getTileRangeForExtentAndZ(extent, zoom);\n    for (let i = tileRange.minX, ii = tileRange.maxX; i <= ii; ++i) {\n      for (let j = tileRange.minY, jj = tileRange.maxY; j <= jj; ++j) {\n        callback([zoom, i, j]);\n      }\n    }\n  }\n\n  /**\n   * @param {import(\"../tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n   * @param {function(this: T, number, import(\"../TileRange.js\").default): boolean} callback Callback.\n   * @param {T=} opt_this The object to use as `this` in `callback`.\n   * @param {import(\"../TileRange.js\").default=} opt_tileRange Temporary import(\"../TileRange.js\").default object.\n   * @param {import(\"../extent.js\").Extent=} opt_extent Temporary import(\"../extent.js\").Extent object.\n   * @return {boolean} Callback succeeded.\n   * @template T\n   */\n  forEachTileCoordParentTileRange(tileCoord, callback, opt_this, opt_tileRange, opt_extent) {\n    let tileRange, x, y;\n    let tileCoordExtent = null;\n    let z = tileCoord[0] - 1;\n    if (this.zoomFactor_ === 2) {\n      x = tileCoord[1];\n      y = tileCoord[2];\n    } else {\n      tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);\n    }\n    while (z >= this.minZoom) {\n      if (this.zoomFactor_ === 2) {\n        x = Math.floor(x / 2);\n        y = Math.floor(y / 2);\n        tileRange = createOrUpdateTileRange(x, x, y, y, opt_tileRange);\n      } else {\n        tileRange = this.getTileRangeForExtentAndZ(tileCoordExtent, z, opt_tileRange);\n      }\n      if (callback.call(opt_this, z, tileRange)) {\n        return true;\n      }\n      --z;\n    }\n    return false;\n  }\n\n  /**\n   * Get the extent for this tile grid, if it was configured.\n   * @return {import(\"../extent.js\").Extent} Extent.\n   */\n  getExtent() {\n    return this.extent_;\n  }\n\n  /**\n   * Get the maximum zoom level for the grid.\n   * @return {number} Max zoom.\n   * @api\n   */\n  getMaxZoom() {\n    return this.maxZoom;\n  }\n\n  /**\n   * Get the minimum zoom level for the grid.\n   * @return {number} Min zoom.\n   * @api\n   */\n  getMinZoom() {\n    return this.minZoom;\n  }\n\n  /**\n   * Get the origin for the grid at the given zoom level.\n   * @param {number} z Integer zoom level.\n   * @return {import(\"../coordinate.js\").Coordinate} Origin.\n   * @api\n   */\n  getOrigin(z) {\n    if (this.origin_) {\n      return this.origin_;\n    } else {\n      return this.origins_[z];\n    }\n  }\n\n  /**\n   * Get the resolution for the given zoom level.\n   * @param {number} z Integer zoom level.\n   * @return {number} Resolution.\n   * @api\n   */\n  getResolution(z) {\n    return this.resolutions_[z];\n  }\n\n  /**\n   * Get the list of resolutions for the tile grid.\n   * @return {Array<number>} Resolutions.\n   * @api\n   */\n  getResolutions() {\n    return this.resolutions_;\n  }\n\n  /**\n   * @param {import(\"../tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n   * @param {import(\"../TileRange.js\").default=} opt_tileRange Temporary import(\"../TileRange.js\").default object.\n   * @param {import(\"../extent.js\").Extent=} opt_extent Temporary import(\"../extent.js\").Extent object.\n   * @return {import(\"../TileRange.js\").default} Tile range.\n   */\n  getTileCoordChildTileRange(tileCoord, opt_tileRange, opt_extent) {\n    if (tileCoord[0] < this.maxZoom) {\n      if (this.zoomFactor_ === 2) {\n        const minX = tileCoord[1] * 2;\n        const minY = tileCoord[2] * 2;\n        return createOrUpdateTileRange(minX, minX + 1, minY, minY + 1, opt_tileRange);\n      }\n      const tileCoordExtent = this.getTileCoordExtent(tileCoord, opt_extent);\n      return this.getTileRangeForExtentAndZ(\n        tileCoordExtent, tileCoord[0] + 1, opt_tileRange);\n    }\n    return null;\n  }\n\n  /**\n   * Get the extent for a tile range.\n   * @param {number} z Integer zoom level.\n   * @param {import(\"../TileRange.js\").default} tileRange Tile range.\n   * @param {import(\"../extent.js\").Extent=} opt_extent Temporary import(\"../extent.js\").Extent object.\n   * @return {import(\"../extent.js\").Extent} Extent.\n   */\n  getTileRangeExtent(z, tileRange, opt_extent) {\n    const origin = this.getOrigin(z);\n    const resolution = this.getResolution(z);\n    const tileSize = toSize(this.getTileSize(z), this.tmpSize_);\n    const minX = origin[0] + tileRange.minX * tileSize[0] * resolution;\n    const maxX = origin[0] + (tileRange.maxX + 1) * tileSize[0] * resolution;\n    const minY = origin[1] + tileRange.minY * tileSize[1] * resolution;\n    const maxY = origin[1] + (tileRange.maxY + 1) * tileSize[1] * resolution;\n    return createOrUpdate(minX, minY, maxX, maxY, opt_extent);\n  }\n\n  /**\n   * Get a tile range for the given extent and integer zoom level.\n   * @param {import(\"../extent.js\").Extent} extent Extent.\n   * @param {number} z Integer zoom level.\n   * @param {import(\"../TileRange.js\").default=} opt_tileRange Temporary tile range object.\n   * @return {import(\"../TileRange.js\").default} Tile range.\n   */\n  getTileRangeForExtentAndZ(extent, z, opt_tileRange) {\n    const tileCoord = tmpTileCoord;\n    this.getTileCoordForXYAndZ_(extent[0], extent[1], z, false, tileCoord);\n    const minX = tileCoord[1];\n    const minY = tileCoord[2];\n    this.getTileCoordForXYAndZ_(extent[2], extent[3], z, true, tileCoord);\n    return createOrUpdateTileRange(minX, tileCoord[1], minY, tileCoord[2], opt_tileRange);\n  }\n\n  /**\n   * @param {import(\"../tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n   * @return {import(\"../coordinate.js\").Coordinate} Tile center.\n   */\n  getTileCoordCenter(tileCoord) {\n    const origin = this.getOrigin(tileCoord[0]);\n    const resolution = this.getResolution(tileCoord[0]);\n    const tileSize = toSize(this.getTileSize(tileCoord[0]), this.tmpSize_);\n    return [\n      origin[0] + (tileCoord[1] + 0.5) * tileSize[0] * resolution,\n      origin[1] + (tileCoord[2] + 0.5) * tileSize[1] * resolution\n    ];\n  }\n\n  /**\n   * Get the extent of a tile coordinate.\n   *\n   * @param {import(\"../tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n   * @param {import(\"../extent.js\").Extent=} opt_extent Temporary extent object.\n   * @return {import(\"../extent.js\").Extent} Extent.\n   * @api\n   */\n  getTileCoordExtent(tileCoord, opt_extent) {\n    const origin = this.getOrigin(tileCoord[0]);\n    const resolution = this.getResolution(tileCoord[0]);\n    const tileSize = toSize(this.getTileSize(tileCoord[0]), this.tmpSize_);\n    const minX = origin[0] + tileCoord[1] * tileSize[0] * resolution;\n    const minY = origin[1] + tileCoord[2] * tileSize[1] * resolution;\n    const maxX = minX + tileSize[0] * resolution;\n    const maxY = minY + tileSize[1] * resolution;\n    return createOrUpdate(minX, minY, maxX, maxY, opt_extent);\n  }\n\n  /**\n   * Get the tile coordinate for the given map coordinate and resolution.  This\n   * method considers that coordinates that intersect tile boundaries should be\n   * assigned the higher tile coordinate.\n   *\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {number} resolution Resolution.\n   * @param {import(\"../tilecoord.js\").TileCoord=} opt_tileCoord Destination import(\"../tilecoord.js\").TileCoord object.\n   * @return {import(\"../tilecoord.js\").TileCoord} Tile coordinate.\n   * @api\n   */\n  getTileCoordForCoordAndResolution(coordinate, resolution, opt_tileCoord) {\n    return this.getTileCoordForXYAndResolution_(\n      coordinate[0], coordinate[1], resolution, false, opt_tileCoord);\n  }\n\n  /**\n   * Note that this method should not be called for resolutions that correspond\n   * to an integer zoom level.  Instead call the `getTileCoordForXYAndZ_` method.\n   * @param {number} x X.\n   * @param {number} y Y.\n   * @param {number} resolution Resolution (for a non-integer zoom level).\n   * @param {boolean} reverseIntersectionPolicy Instead of letting edge\n   *     intersections go to the higher tile coordinate, let edge intersections\n   *     go to the lower tile coordinate.\n   * @param {import(\"../tilecoord.js\").TileCoord=} opt_tileCoord Temporary import(\"../tilecoord.js\").TileCoord object.\n   * @return {import(\"../tilecoord.js\").TileCoord} Tile coordinate.\n   * @private\n   */\n  getTileCoordForXYAndResolution_(x, y, resolution, reverseIntersectionPolicy, opt_tileCoord) {\n    const z = this.getZForResolution(resolution);\n    const scale = resolution / this.getResolution(z);\n    const origin = this.getOrigin(z);\n    const tileSize = toSize(this.getTileSize(z), this.tmpSize_);\n\n    const adjustX = reverseIntersectionPolicy ? 0.5 : 0;\n    const adjustY = reverseIntersectionPolicy ? 0 : 0.5;\n    const xFromOrigin = Math.floor((x - origin[0]) / resolution + adjustX);\n    const yFromOrigin = Math.floor((y - origin[1]) / resolution + adjustY);\n    let tileCoordX = scale * xFromOrigin / tileSize[0];\n    let tileCoordY = scale * yFromOrigin / tileSize[1];\n\n    if (reverseIntersectionPolicy) {\n      tileCoordX = Math.ceil(tileCoordX) - 1;\n      tileCoordY = Math.ceil(tileCoordY) - 1;\n    } else {\n      tileCoordX = Math.floor(tileCoordX);\n      tileCoordY = Math.floor(tileCoordY);\n    }\n\n    return createOrUpdateTileCoord(z, tileCoordX, tileCoordY, opt_tileCoord);\n  }\n\n  /**\n   * Although there is repetition between this method and `getTileCoordForXYAndResolution_`,\n   * they should have separate implementations.  This method is for integer zoom\n   * levels.  The other method should only be called for resolutions corresponding\n   * to non-integer zoom levels.\n   * @param {number} x Map x coordinate.\n   * @param {number} y Map y coordinate.\n   * @param {number} z Integer zoom level.\n   * @param {boolean} reverseIntersectionPolicy Instead of letting edge\n   *     intersections go to the higher tile coordinate, let edge intersections\n   *     go to the lower tile coordinate.\n   * @param {import(\"../tilecoord.js\").TileCoord=} opt_tileCoord Temporary import(\"../tilecoord.js\").TileCoord object.\n   * @return {import(\"../tilecoord.js\").TileCoord} Tile coordinate.\n   * @private\n   */\n  getTileCoordForXYAndZ_(x, y, z, reverseIntersectionPolicy, opt_tileCoord) {\n    const origin = this.getOrigin(z);\n    const resolution = this.getResolution(z);\n    const tileSize = toSize(this.getTileSize(z), this.tmpSize_);\n\n    const adjustX = reverseIntersectionPolicy ? 0.5 : 0;\n    const adjustY = reverseIntersectionPolicy ? 0 : 0.5;\n    const xFromOrigin = Math.floor((x - origin[0]) / resolution + adjustX);\n    const yFromOrigin = Math.floor((y - origin[1]) / resolution + adjustY);\n    let tileCoordX = xFromOrigin / tileSize[0];\n    let tileCoordY = yFromOrigin / tileSize[1];\n\n    if (reverseIntersectionPolicy) {\n      tileCoordX = Math.ceil(tileCoordX) - 1;\n      tileCoordY = Math.ceil(tileCoordY) - 1;\n    } else {\n      tileCoordX = Math.floor(tileCoordX);\n      tileCoordY = Math.floor(tileCoordY);\n    }\n\n    return createOrUpdateTileCoord(z, tileCoordX, tileCoordY, opt_tileCoord);\n  }\n\n  /**\n   * Get a tile coordinate given a map coordinate and zoom level.\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {number} z Zoom level.\n   * @param {import(\"../tilecoord.js\").TileCoord=} opt_tileCoord Destination import(\"../tilecoord.js\").TileCoord object.\n   * @return {import(\"../tilecoord.js\").TileCoord} Tile coordinate.\n   * @api\n   */\n  getTileCoordForCoordAndZ(coordinate, z, opt_tileCoord) {\n    return this.getTileCoordForXYAndZ_(\n      coordinate[0], coordinate[1], z, false, opt_tileCoord);\n  }\n\n  /**\n   * @param {import(\"../tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n   * @return {number} Tile resolution.\n   */\n  getTileCoordResolution(tileCoord) {\n    return this.resolutions_[tileCoord[0]];\n  }\n\n  /**\n   * Get the tile size for a zoom level. The type of the return value matches the\n   * `tileSize` or `tileSizes` that the tile grid was configured with. To always\n   * get an `import(\"../size.js\").Size`, run the result through `import(\"../size.js\").Size.toSize()`.\n   * @param {number} z Z.\n   * @return {number|import(\"../size.js\").Size} Tile size.\n   * @api\n   */\n  getTileSize(z) {\n    if (this.tileSize_) {\n      return this.tileSize_;\n    } else {\n      return this.tileSizes_[z];\n    }\n  }\n\n  /**\n   * @param {number} z Zoom level.\n   * @return {import(\"../TileRange.js\").default} Extent tile range for the specified zoom level.\n   */\n  getFullTileRange(z) {\n    if (!this.fullTileRanges_) {\n      return null;\n    } else {\n      return this.fullTileRanges_[z];\n    }\n  }\n\n  /**\n   * @param {number} resolution Resolution.\n   * @param {number=} opt_direction If 0, the nearest resolution will be used.\n   *     If 1, the nearest lower resolution will be used. If -1, the nearest\n   *     higher resolution will be used. Default is 0.\n   * @return {number} Z.\n   * @api\n   */\n  getZForResolution(resolution, opt_direction) {\n    const z = linearFindNearest(this.resolutions_, resolution, opt_direction || 0);\n    return clamp(z, this.minZoom, this.maxZoom);\n  }\n\n  /**\n   * @param {!import(\"../extent.js\").Extent} extent Extent for this tile grid.\n   * @private\n   */\n  calculateTileRanges_(extent) {\n    const length = this.resolutions_.length;\n    const fullTileRanges = new Array(length);\n    for (let z = this.minZoom; z < length; ++z) {\n      fullTileRanges[z] = this.getTileRangeForExtentAndZ(extent, z);\n    }\n    this.fullTileRanges_ = fullTileRanges;\n  }\n}\n\n\nexport default TileGrid;\n","/**\n * @module ol/tilegrid\n */\nimport {DEFAULT_MAX_ZOOM, DEFAULT_TILE_SIZE} from './tilegrid/common.js';\nimport {toSize} from './size.js';\nimport {containsCoordinate, createOrUpdate, getCorner, getHeight, getWidth} from './extent.js';\nimport Corner from './extent/Corner.js';\nimport {get as getProjection, METERS_PER_UNIT} from './proj.js';\nimport Units from './proj/Units.js';\nimport TileGrid from './tilegrid/TileGrid.js';\n\n\n/**\n * @param {import(\"./proj/Projection.js\").default} projection Projection.\n * @return {!TileGrid} Default tile grid for the\n * passed projection.\n */\nexport function getForProjection(projection) {\n  let tileGrid = projection.getDefaultTileGrid();\n  if (!tileGrid) {\n    tileGrid = createForProjection(projection);\n    projection.setDefaultTileGrid(tileGrid);\n  }\n  return tileGrid;\n}\n\n\n/**\n * @param {TileGrid} tileGrid Tile grid.\n * @param {import(\"./tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n * @param {import(\"./proj/Projection.js\").default} projection Projection.\n * @return {import(\"./tilecoord.js\").TileCoord} Tile coordinate.\n */\nexport function wrapX(tileGrid, tileCoord, projection) {\n  const z = tileCoord[0];\n  const center = tileGrid.getTileCoordCenter(tileCoord);\n  const projectionExtent = extentFromProjection(projection);\n  if (!containsCoordinate(projectionExtent, center)) {\n    const worldWidth = getWidth(projectionExtent);\n    const worldsAway = Math.ceil((projectionExtent[0] - center[0]) / worldWidth);\n    center[0] += worldWidth * worldsAway;\n    return tileGrid.getTileCoordForCoordAndZ(center, z);\n  } else {\n    return tileCoord;\n  }\n}\n\n\n/**\n * @param {import(\"./extent.js\").Extent} extent Extent.\n * @param {number=} opt_maxZoom Maximum zoom level (default is\n *     DEFAULT_MAX_ZOOM).\n * @param {number|import(\"./size.js\").Size=} opt_tileSize Tile size (default uses\n *     DEFAULT_TILE_SIZE).\n * @param {Corner=} opt_corner Extent corner (default is `'top-left'`).\n * @return {!TileGrid} TileGrid instance.\n */\nexport function createForExtent(extent, opt_maxZoom, opt_tileSize, opt_corner) {\n  const corner = opt_corner !== undefined ? opt_corner : Corner.TOP_LEFT;\n\n  const resolutions = resolutionsFromExtent(extent, opt_maxZoom, opt_tileSize);\n\n  return new TileGrid({\n    extent: extent,\n    origin: getCorner(extent, corner),\n    resolutions: resolutions,\n    tileSize: opt_tileSize\n  });\n}\n\n\n/**\n * @typedef {Object} XYZOptions\n * @property {import(\"./extent.js\").Extent} [extent] Extent for the tile grid. The origin for an XYZ tile grid is the\n * top-left corner of the extent. The zero level of the grid is defined by the resolution at which one tile fits in the\n * provided extent. If not provided, the extent of the EPSG:3857 projection is used.\n * @property {number} [maxZoom] Maximum zoom. The default is `42`. This determines the number of levels\n * in the grid set. For example, a `maxZoom` of 21 means there are 22 levels in the grid set.\n * @property {number} [minZoom=0] Minimum zoom.\n * @property {number|import(\"./size.js\").Size} [tileSize=[256, 256]] Tile size in pixels.\n */\n\n\n/**\n * Creates a tile grid with a standard XYZ tiling scheme.\n * @param {XYZOptions=} opt_options Tile grid options.\n * @return {!TileGrid} Tile grid instance.\n * @api\n */\nexport function createXYZ(opt_options) {\n  /** @type {XYZOptions} */\n  const xyzOptions = opt_options || {};\n\n  const extent = xyzOptions.extent || getProjection('EPSG:3857').getExtent();\n\n  /** @type {import(\"./tilegrid/TileGrid.js\").Options} */\n  const gridOptions = {\n    extent: extent,\n    minZoom: xyzOptions.minZoom,\n    tileSize: xyzOptions.tileSize,\n    resolutions: resolutionsFromExtent(\n      extent,\n      xyzOptions.maxZoom,\n      xyzOptions.tileSize\n    )\n  };\n  return new TileGrid(gridOptions);\n}\n\n\n/**\n * Create a resolutions array from an extent.  A zoom factor of 2 is assumed.\n * @param {import(\"./extent.js\").Extent} extent Extent.\n * @param {number=} opt_maxZoom Maximum zoom level (default is\n *     DEFAULT_MAX_ZOOM).\n * @param {number|import(\"./size.js\").Size=} opt_tileSize Tile size (default uses\n *     DEFAULT_TILE_SIZE).\n * @return {!Array<number>} Resolutions array.\n */\nfunction resolutionsFromExtent(extent, opt_maxZoom, opt_tileSize) {\n  const maxZoom = opt_maxZoom !== undefined ?\n    opt_maxZoom : DEFAULT_MAX_ZOOM;\n\n  const height = getHeight(extent);\n  const width = getWidth(extent);\n\n  const tileSize = toSize(opt_tileSize !== undefined ?\n    opt_tileSize : DEFAULT_TILE_SIZE);\n  const maxResolution = Math.max(\n    width / tileSize[0], height / tileSize[1]);\n\n  const length = maxZoom + 1;\n  const resolutions = new Array(length);\n  for (let z = 0; z < length; ++z) {\n    resolutions[z] = maxResolution / Math.pow(2, z);\n  }\n  return resolutions;\n}\n\n\n/**\n * @param {import(\"./proj.js\").ProjectionLike} projection Projection.\n * @param {number=} opt_maxZoom Maximum zoom level (default is\n *     DEFAULT_MAX_ZOOM).\n * @param {number|import(\"./size.js\").Size=} opt_tileSize Tile size (default uses\n *     DEFAULT_TILE_SIZE).\n * @param {Corner=} opt_corner Extent corner (default is `'top-left'`).\n * @return {!TileGrid} TileGrid instance.\n */\nexport function createForProjection(projection, opt_maxZoom, opt_tileSize, opt_corner) {\n  const extent = extentFromProjection(projection);\n  return createForExtent(extent, opt_maxZoom, opt_tileSize, opt_corner);\n}\n\n\n/**\n * Generate a tile grid extent from a projection.  If the projection has an\n * extent, it is used.  If not, a global extent is assumed.\n * @param {import(\"./proj.js\").ProjectionLike} projection Projection.\n * @return {import(\"./extent.js\").Extent} Extent.\n */\nexport function extentFromProjection(projection) {\n  projection = getProjection(projection);\n  let extent = projection.getExtent();\n  if (!extent) {\n    const half = 180 * METERS_PER_UNIT[Units.DEGREES] / projection.getMetersPerUnit();\n    extent = createOrUpdate(-half, -half, half, half);\n  }\n  return extent;\n}\n","/**\n * @module ol/source/Tile\n */\nimport {abstract} from '../util.js';\nimport TileCache from '../TileCache.js';\nimport TileState from '../TileState.js';\nimport Event from '../events/Event.js';\nimport {equivalent} from '../proj.js';\nimport {toSize, scale as scaleSize} from '../size.js';\nimport Source from './Source.js';\nimport {getKeyZXY, withinExtentAndZ} from '../tilecoord.js';\nimport {wrapX, getForProjection as getTileGridForProjection} from '../tilegrid.js';\n\n/**\n * @typedef {Object} Options\n * @property {import(\"./Source.js\").AttributionLike} [attributions]\n * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.\n * @property {number} [cacheSize]\n * @property {boolean} [opaque]\n * @property {number} [tilePixelRatio]\n * @property {import(\"../proj.js\").ProjectionLike} [projection]\n * @property {import(\"./State.js\").default} [state]\n * @property {import(\"../tilegrid/TileGrid.js\").default} [tileGrid]\n * @property {boolean} [wrapX=true]\n * @property {number} [transition]\n * @property {string} [key]\n */\n\n\n/**\n * @classdesc\n * Abstract base class; normally only used for creating subclasses and not\n * instantiated in apps.\n * Base class for sources providing images divided into a tile grid.\n * @abstract\n * @api\n */\nclass TileSource extends Source {\n  /**\n   * @param {Options} options SourceTile source options.\n   */\n  constructor(options) {\n\n    super({\n      attributions: options.attributions,\n      attributionsCollapsible: options.attributionsCollapsible,\n      projection: options.projection,\n      state: options.state,\n      wrapX: options.wrapX\n    });\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.opaque_ = options.opaque !== undefined ? options.opaque : false;\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.tilePixelRatio_ = options.tilePixelRatio !== undefined ?\n      options.tilePixelRatio : 1;\n\n    /**\n     * @protected\n     * @type {import(\"../tilegrid/TileGrid.js\").default}\n     */\n    this.tileGrid = options.tileGrid !== undefined ? options.tileGrid : null;\n\n    /**\n     * @protected\n     * @type {import(\"../TileCache.js\").default}\n     */\n    this.tileCache = new TileCache(options.cacheSize);\n\n    /**\n     * @protected\n     * @type {import(\"../size.js\").Size}\n     */\n    this.tmpSize = [0, 0];\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.key_ = options.key || '';\n\n    /**\n     * @protected\n     * @type {import(\"../Tile.js\").Options}\n     */\n    this.tileOptions = {transition: options.transition};\n\n  }\n\n  /**\n   * @return {boolean} Can expire cache.\n   */\n  canExpireCache() {\n    return this.tileCache.canExpireCache();\n  }\n\n  /**\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @param {!Object<string, import(\"../TileRange.js\").default>} usedTiles Used tiles.\n   */\n  expireCache(projection, usedTiles) {\n    const tileCache = this.getTileCacheForProjection(projection);\n    if (tileCache) {\n      tileCache.expireCache(usedTiles);\n    }\n  }\n\n  /**\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @param {number} z Zoom level.\n   * @param {import(\"../TileRange.js\").default} tileRange Tile range.\n   * @param {function(import(\"../Tile.js\").default):(boolean|void)} callback Called with each\n   *     loaded tile.  If the callback returns `false`, the tile will not be\n   *     considered loaded.\n   * @return {boolean} The tile range is fully covered with loaded tiles.\n   */\n  forEachLoadedTile(projection, z, tileRange, callback) {\n    const tileCache = this.getTileCacheForProjection(projection);\n    if (!tileCache) {\n      return false;\n    }\n\n    let covered = true;\n    let tile, tileCoordKey, loaded;\n    for (let x = tileRange.minX; x <= tileRange.maxX; ++x) {\n      for (let y = tileRange.minY; y <= tileRange.maxY; ++y) {\n        tileCoordKey = getKeyZXY(z, x, y);\n        loaded = false;\n        if (tileCache.containsKey(tileCoordKey)) {\n          tile = /** @type {!import(\"../Tile.js\").default} */ (tileCache.get(tileCoordKey));\n          loaded = tile.getState() === TileState.LOADED;\n          if (loaded) {\n            loaded = (callback(tile) !== false);\n          }\n        }\n        if (!loaded) {\n          covered = false;\n        }\n      }\n    }\n    return covered;\n  }\n\n  /**\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @return {number} Gutter.\n   */\n  getGutterForProjection(projection) {\n    return 0;\n  }\n\n  /**\n   * Return the key to be used for all tiles in the source.\n   * @return {string} The key for all tiles.\n   * @protected\n   */\n  getKey() {\n    return this.key_;\n  }\n\n  /**\n   * Set the value to be used as the key for all tiles in the source.\n   * @param {string} key The key for tiles.\n   * @protected\n   */\n  setKey(key) {\n    if (this.key_ !== key) {\n      this.key_ = key;\n      this.changed();\n    }\n  }\n\n  /**\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @return {boolean} Opaque.\n   */\n  getOpaque(projection) {\n    return this.opaque_;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getResolutions() {\n    return this.tileGrid.getResolutions();\n  }\n\n  /**\n   * @abstract\n   * @param {number} z Tile coordinate z.\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @return {!import(\"../Tile.js\").default} Tile.\n   */\n  getTile(z, x, y, pixelRatio, projection) {\n    return abstract();\n  }\n\n  /**\n   * Return the tile grid of the tile source.\n   * @return {import(\"../tilegrid/TileGrid.js\").default} Tile grid.\n   * @api\n   */\n  getTileGrid() {\n    return this.tileGrid;\n  }\n\n  /**\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @return {!import(\"../tilegrid/TileGrid.js\").default} Tile grid.\n   */\n  getTileGridForProjection(projection) {\n    if (!this.tileGrid) {\n      return getTileGridForProjection(projection);\n    } else {\n      return this.tileGrid;\n    }\n  }\n\n  /**\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @return {import(\"../TileCache.js\").default} Tile cache.\n   * @protected\n   */\n  getTileCacheForProjection(projection) {\n    const thisProj = this.getProjection();\n    if (thisProj && !equivalent(thisProj, projection)) {\n      return null;\n    } else {\n      return this.tileCache;\n    }\n  }\n\n  /**\n   * Get the tile pixel ratio for this source. Subclasses may override this\n   * method, which is meant to return a supported pixel ratio that matches the\n   * provided `pixelRatio` as close as possible.\n   * @param {number} pixelRatio Pixel ratio.\n   * @return {number} Tile pixel ratio.\n   */\n  getTilePixelRatio(pixelRatio) {\n    return this.tilePixelRatio_;\n  }\n\n  /**\n   * @param {number} z Z.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @return {import(\"../size.js\").Size} Tile size.\n   */\n  getTilePixelSize(z, pixelRatio, projection) {\n    const tileGrid = this.getTileGridForProjection(projection);\n    const tilePixelRatio = this.getTilePixelRatio(pixelRatio);\n    const tileSize = toSize(tileGrid.getTileSize(z), this.tmpSize);\n    if (tilePixelRatio == 1) {\n      return tileSize;\n    } else {\n      return scaleSize(tileSize, tilePixelRatio, this.tmpSize);\n    }\n  }\n\n  /**\n   * Returns a tile coordinate wrapped around the x-axis. When the tile coordinate\n   * is outside the resolution and extent range of the tile grid, `null` will be\n   * returned.\n   * @param {import(\"../tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n   * @param {import(\"../proj/Projection.js\").default=} opt_projection Projection.\n   * @return {import(\"../tilecoord.js\").TileCoord} Tile coordinate to be passed to the tileUrlFunction or\n   *     null if no tile URL should be created for the passed `tileCoord`.\n   */\n  getTileCoordForTileUrlFunction(tileCoord, opt_projection) {\n    const projection = opt_projection !== undefined ?\n      opt_projection : this.getProjection();\n    const tileGrid = this.getTileGridForProjection(projection);\n    if (this.getWrapX() && projection.isGlobal()) {\n      tileCoord = wrapX(tileGrid, tileCoord, projection);\n    }\n    return withinExtentAndZ(tileCoord, tileGrid) ? tileCoord : null;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  refresh() {\n    this.tileCache.clear();\n    this.changed();\n  }\n\n  /**\n   * Marks a tile coord as being used, without triggering a load.\n   * @abstract\n   * @param {number} z Tile coordinate z.\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   */\n  useTile(z, x, y, projection) {}\n\n}\n\n\n/**\n * @classdesc\n * Events emitted by {@link module:ol/source/Tile~TileSource} instances are instances of this\n * type.\n */\nexport class TileSourceEvent extends Event {\n  /**\n   * @param {string} type Type.\n   * @param {import(\"../Tile.js\").default} tile The tile.\n   */\n  constructor(type, tile) {\n\n    super(type);\n\n    /**\n     * The tile related to the event.\n     * @type {import(\"../Tile.js\").default}\n     * @api\n     */\n    this.tile = tile;\n\n  }\n\n}\n\nexport default TileSource;\n","/**\n * @module ol/source/TileEventType\n */\n\n/**\n * @enum {string}\n */\nexport default {\n\n  /**\n   * Triggered when a tile starts loading.\n   * @event module:ol/source/Tile.TileSourceEvent#tileloadstart\n   * @api\n   */\n  TILELOADSTART: 'tileloadstart',\n\n  /**\n   * Triggered when a tile finishes loading, either when its data is loaded,\n   * or when loading was aborted because the tile is no longer needed.\n   * @event module:ol/source/Tile.TileSourceEvent#tileloadend\n   * @api\n   */\n  TILELOADEND: 'tileloadend',\n\n  /**\n   * Triggered if tile loading results in an error.\n   * @event module:ol/source/Tile.TileSourceEvent#tileloaderror\n   * @api\n   */\n  TILELOADERROR: 'tileloaderror'\n\n};\n","/**\n * @module ol/source/UrlTile\n */\nimport {getUid} from '../util.js';\nimport TileState from '../TileState.js';\nimport {expandUrl, createFromTemplates, nullTileUrlFunction} from '../tileurlfunction.js';\nimport TileSource, {TileSourceEvent} from './Tile.js';\nimport TileEventType from './TileEventType.js';\nimport {getKeyZXY} from '../tilecoord.js';\n\n/**\n * @typedef {Object} Options\n * @property {import(\"./Source.js\").AttributionLike} [attributions]\n * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.\n * @property {number} [cacheSize]\n * @property {boolean} [opaque]\n * @property {import(\"../proj.js\").ProjectionLike} [projection]\n * @property {import(\"./State.js\").default} [state]\n * @property {import(\"../tilegrid/TileGrid.js\").default} [tileGrid]\n * @property {import(\"../Tile.js\").LoadFunction} tileLoadFunction\n * @property {number} [tilePixelRatio]\n * @property {import(\"../Tile.js\").UrlFunction} [tileUrlFunction]\n * @property {string} [url]\n * @property {Array<string>} [urls]\n * @property {boolean} [wrapX=true]\n * @property {number} [transition]\n * @property {string} [key]\n */\n\n\n/**\n * @classdesc\n * Base class for sources providing tiles divided into a tile grid over http.\n *\n * @fires import(\"./Tile.js\").TileSourceEvent\n */\nclass UrlTile extends TileSource {\n  /**\n   * @param {Options} options Image tile options.\n   */\n  constructor(options) {\n\n    super({\n      attributions: options.attributions,\n      cacheSize: options.cacheSize,\n      opaque: options.opaque,\n      projection: options.projection,\n      state: options.state,\n      tileGrid: options.tileGrid,\n      tilePixelRatio: options.tilePixelRatio,\n      wrapX: options.wrapX,\n      transition: options.transition,\n      key: options.key,\n      attributionsCollapsible: options.attributionsCollapsible\n    });\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.generateTileUrlFunction_ = !options.tileUrlFunction;\n\n    /**\n     * @protected\n     * @type {import(\"../Tile.js\").LoadFunction}\n     */\n    this.tileLoadFunction = options.tileLoadFunction;\n\n    /**\n     * @protected\n     * @type {import(\"../Tile.js\").UrlFunction}\n     */\n    this.tileUrlFunction = options.tileUrlFunction ? options.tileUrlFunction.bind(this) : nullTileUrlFunction;\n\n    /**\n     * @protected\n     * @type {!Array<string>|null}\n     */\n    this.urls = null;\n\n    if (options.urls) {\n      this.setUrls(options.urls);\n    } else if (options.url) {\n      this.setUrl(options.url);\n    }\n\n    if (options.tileUrlFunction) {\n      this.setTileUrlFunction(options.tileUrlFunction, this.key_);\n    }\n\n    /**\n     * @private\n     * @type {!Object<string, boolean>}\n     */\n    this.tileLoadingKeys_ = {};\n\n  }\n\n  /**\n   * Return the tile load function of the source.\n   * @return {import(\"../Tile.js\").LoadFunction} TileLoadFunction\n   * @api\n   */\n  getTileLoadFunction() {\n    return this.tileLoadFunction;\n  }\n\n  /**\n   * Return the tile URL function of the source.\n   * @return {import(\"../Tile.js\").UrlFunction} TileUrlFunction\n   * @api\n   */\n  getTileUrlFunction() {\n    return this.tileUrlFunction;\n  }\n\n  /**\n   * Return the URLs used for this source.\n   * When a tileUrlFunction is used instead of url or urls,\n   * null will be returned.\n   * @return {!Array<string>|null} URLs.\n   * @api\n   */\n  getUrls() {\n    return this.urls;\n  }\n\n  /**\n   * Handle tile change events.\n   * @param {import(\"../events/Event.js\").default} event Event.\n   * @protected\n   */\n  handleTileChange(event) {\n    const tile = /** @type {import(\"../Tile.js\").default} */ (event.target);\n    const uid = getUid(tile);\n    const tileState = tile.getState();\n    let type;\n    if (tileState == TileState.LOADING) {\n      this.tileLoadingKeys_[uid] = true;\n      type = TileEventType.TILELOADSTART;\n    } else if (uid in this.tileLoadingKeys_) {\n      delete this.tileLoadingKeys_[uid];\n      type = tileState == TileState.ERROR ? TileEventType.TILELOADERROR :\n        (tileState == TileState.LOADED || tileState == TileState.ABORT) ?\n          TileEventType.TILELOADEND : undefined;\n    }\n    if (type != undefined) {\n      this.dispatchEvent(new TileSourceEvent(type, tile));\n    }\n  }\n\n  /**\n   * Set the tile load function of the source.\n   * @param {import(\"../Tile.js\").LoadFunction} tileLoadFunction Tile load function.\n   * @api\n   */\n  setTileLoadFunction(tileLoadFunction) {\n    this.tileCache.clear();\n    this.tileLoadFunction = tileLoadFunction;\n    this.changed();\n  }\n\n  /**\n   * Set the tile URL function of the source.\n   * @param {import(\"../Tile.js\").UrlFunction} tileUrlFunction Tile URL function.\n   * @param {string=} key Optional new tile key for the source.\n   * @api\n   */\n  setTileUrlFunction(tileUrlFunction, key) {\n    this.tileUrlFunction = tileUrlFunction;\n    this.tileCache.pruneExceptNewestZ();\n    if (typeof key !== 'undefined') {\n      this.setKey(key);\n    } else {\n      this.changed();\n    }\n  }\n\n  /**\n   * Set the URL to use for requests.\n   * @param {string} url URL.\n   * @api\n   */\n  setUrl(url) {\n    const urls = this.urls = expandUrl(url);\n    this.setUrls(urls);\n  }\n\n  /**\n   * Set the URLs to use for requests.\n   * @param {Array<string>} urls URLs.\n   * @api\n   */\n  setUrls(urls) {\n    this.urls = urls;\n    const key = urls.join('\\n');\n    if (this.generateTileUrlFunction_) {\n      this.setTileUrlFunction(createFromTemplates(urls, this.tileGrid), key);\n    } else {\n      this.setKey(key);\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  useTile(z, x, y) {\n    const tileCoordKey = getKeyZXY(z, x, y);\n    if (this.tileCache.containsKey(tileCoordKey)) {\n      this.tileCache.get(tileCoordKey);\n    }\n  }\n}\n\n\nexport default UrlTile;\n","/**\n * @module ol/source/TileImage\n */\nimport {ENABLE_RASTER_REPROJECTION} from '../reproj/common.js';\nimport {getUid} from '../util.js';\nimport ImageTile from '../ImageTile.js';\nimport TileCache from '../TileCache.js';\nimport TileState from '../TileState.js';\nimport {listen} from '../events.js';\nimport EventType from '../events/EventType.js';\nimport {equivalent, get as getProjection} from '../proj.js';\nimport ReprojTile from '../reproj/Tile.js';\nimport UrlTile from './UrlTile.js';\nimport {getKey, getKeyZXY} from '../tilecoord.js';\nimport {getForProjection as getTileGridForProjection} from '../tilegrid.js';\n\n/**\n * @typedef {Object} Options\n * @property {import(\"./Source.js\").AttributionLike} [attributions] Attributions.\n * @property {boolean} [attributionsCollapsible=true] Attributions are collapsible.\n * @property {number} [cacheSize=2048] Cache size.\n * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that\n * you must provide a `crossOrigin` value if you are using the WebGL renderer or if you want to\n * access pixel data with the Canvas renderer.  See\n * https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.\n * @property {boolean} [opaque=true] Whether the layer is opaque.\n * @property {import(\"../proj.js\").ProjectionLike} projection Projection.\n * @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).\n * Higher values can increase reprojection performance, but decrease precision.\n * @property {import(\"./State.js\").default} [state] Source state.\n * @property {typeof import(\"../ImageTile.js\").default} [tileClass] Class used to instantiate image tiles.\n * Default is {@link module:ol/ImageTile~ImageTile}.\n * @property {import(\"../tilegrid/TileGrid.js\").default} [tileGrid] Tile grid.\n * @property {import(\"../Tile.js\").LoadFunction} [tileLoadFunction] Optional function to load a tile given a URL. The default is\n * ```js\n * function(imageTile, src) {\n *   imageTile.getImage().src = src;\n * };\n * ```\n * @property {number} [tilePixelRatio=1] The pixel ratio used by the tile service. For example, if the tile\n * service advertizes 256px by 256px tiles but actually sends 512px\n * by 512px images (for retina/hidpi devices) then `tilePixelRatio`\n * should be set to `2`.\n * @property {import(\"../Tile.js\").UrlFunction} [tileUrlFunction] Optional function to get tile URL given a tile coordinate and the projection.\n * @property {string} [url] URL template. Must include `{x}`, `{y}` or `{-y}`, and `{z}` placeholders.\n * A `{?-?}` template pattern, for example `subdomain{a-f}.domain.com`, may be\n * used instead of defining each one separately in the `urls` option.\n * @property {Array<string>} [urls] An array of URL templates.\n * @property {boolean} [wrapX] Whether to wrap the world horizontally. The default, is to\n * request out-of-bounds tiles from the server. When set to `false`, only one\n * world will be rendered. When set to `true`, tiles will be requested for one\n * world only, but they will be wrapped horizontally to render multiple worlds.\n * @property {number} [transition] Duration of the opacity transition for rendering.\n * To disable the opacity transition, pass `transition: 0`.\n * @property {string} [key] Optional tile key for proper cache fetching\n */\n\n\n/**\n * @classdesc\n * Base class for sources providing images divided into a tile grid.\n *\n * @fires import(\"./Tile.js\").TileSourceEvent\n * @api\n */\nclass TileImage extends UrlTile {\n  /**\n   * @param {!Options} options Image tile options.\n   */\n  constructor(options) {\n\n    super({\n      attributions: options.attributions,\n      cacheSize: options.cacheSize,\n      opaque: options.opaque,\n      projection: options.projection,\n      state: options.state,\n      tileGrid: options.tileGrid,\n      tileLoadFunction: options.tileLoadFunction ?\n        options.tileLoadFunction : defaultTileLoadFunction,\n      tilePixelRatio: options.tilePixelRatio,\n      tileUrlFunction: options.tileUrlFunction,\n      url: options.url,\n      urls: options.urls,\n      wrapX: options.wrapX,\n      transition: options.transition,\n      key: options.key,\n      attributionsCollapsible: options.attributionsCollapsible\n    });\n\n    /**\n     * @protected\n     * @type {?string}\n     */\n    this.crossOrigin =\n        options.crossOrigin !== undefined ? options.crossOrigin : null;\n\n    /**\n     * @protected\n     * @type {typeof ImageTile}\n     */\n    this.tileClass = options.tileClass !== undefined ?\n      options.tileClass : ImageTile;\n\n    /**\n     * @protected\n     * @type {!Object<string, TileCache>}\n     */\n    this.tileCacheForProjection = {};\n\n    /**\n     * @protected\n     * @type {!Object<string, import(\"../tilegrid/TileGrid.js\").default>}\n     */\n    this.tileGridForProjection = {};\n\n    /**\n     * @private\n     * @type {number|undefined}\n     */\n    this.reprojectionErrorThreshold_ = options.reprojectionErrorThreshold;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.renderReprojectionEdges_ = false;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  canExpireCache() {\n    if (!ENABLE_RASTER_REPROJECTION) {\n      return super.canExpireCache();\n    }\n    if (this.tileCache.canExpireCache()) {\n      return true;\n    } else {\n      for (const key in this.tileCacheForProjection) {\n        if (this.tileCacheForProjection[key].canExpireCache()) {\n          return true;\n        }\n      }\n    }\n    return false;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  expireCache(projection, usedTiles) {\n    if (!ENABLE_RASTER_REPROJECTION) {\n      super.expireCache(projection, usedTiles);\n      return;\n    }\n    const usedTileCache = this.getTileCacheForProjection(projection);\n\n    this.tileCache.expireCache(this.tileCache == usedTileCache ? usedTiles : {});\n    for (const id in this.tileCacheForProjection) {\n      const tileCache = this.tileCacheForProjection[id];\n      tileCache.expireCache(tileCache == usedTileCache ? usedTiles : {});\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getGutterForProjection(projection) {\n    if (ENABLE_RASTER_REPROJECTION &&\n        this.getProjection() && projection && !equivalent(this.getProjection(), projection)) {\n      return 0;\n    } else {\n      return this.getGutter();\n    }\n  }\n\n  /**\n   * @return {number} Gutter.\n   */\n  getGutter() {\n    return 0;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getOpaque(projection) {\n    if (ENABLE_RASTER_REPROJECTION &&\n        this.getProjection() && projection && !equivalent(this.getProjection(), projection)) {\n      return false;\n    } else {\n      return super.getOpaque(projection);\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTileGridForProjection(projection) {\n    if (!ENABLE_RASTER_REPROJECTION) {\n      return super.getTileGridForProjection(projection);\n    }\n    const thisProj = this.getProjection();\n    if (this.tileGrid && (!thisProj || equivalent(thisProj, projection))) {\n      return this.tileGrid;\n    } else {\n      const projKey = getUid(projection);\n      if (!(projKey in this.tileGridForProjection)) {\n        this.tileGridForProjection[projKey] = getTileGridForProjection(projection);\n      }\n      return (\n        /** @type {!import(\"../tilegrid/TileGrid.js\").default} */ (this.tileGridForProjection[projKey])\n      );\n    }\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTileCacheForProjection(projection) {\n    if (!ENABLE_RASTER_REPROJECTION) {\n      return super.getTileCacheForProjection(projection);\n    }\n    const thisProj = this.getProjection(); if (!thisProj || equivalent(thisProj, projection)) {\n      return this.tileCache;\n    } else {\n      const projKey = getUid(projection);\n      if (!(projKey in this.tileCacheForProjection)) {\n        this.tileCacheForProjection[projKey] = new TileCache(this.tileCache.highWaterMark);\n      }\n      return this.tileCacheForProjection[projKey];\n    }\n  }\n\n  /**\n   * @param {number} z Tile coordinate z.\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @param {string} key The key set on the tile.\n   * @return {!import(\"../Tile.js\").default} Tile.\n   * @private\n   */\n  createTile_(z, x, y, pixelRatio, projection, key) {\n    const tileCoord = [z, x, y];\n    const urlTileCoord = this.getTileCoordForTileUrlFunction(\n      tileCoord, projection);\n    const tileUrl = urlTileCoord ?\n      this.tileUrlFunction(urlTileCoord, pixelRatio, projection) : undefined;\n    const tile = new this.tileClass(\n      tileCoord,\n      tileUrl !== undefined ? TileState.IDLE : TileState.EMPTY,\n      tileUrl !== undefined ? tileUrl : '',\n      this.crossOrigin,\n      this.tileLoadFunction,\n      this.tileOptions);\n    tile.key = key;\n    listen(tile, EventType.CHANGE,\n      this.handleTileChange, this);\n    return tile;\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTile(z, x, y, pixelRatio, projection) {\n    const sourceProjection = /** @type {!import(\"../proj/Projection.js\").default} */ (this.getProjection());\n    if (!ENABLE_RASTER_REPROJECTION ||\n        !sourceProjection || !projection || equivalent(sourceProjection, projection)) {\n      return this.getTileInternal(z, x, y, pixelRatio, sourceProjection || projection);\n    } else {\n      const cache = this.getTileCacheForProjection(projection);\n      const tileCoord = [z, x, y];\n      let tile;\n      const tileCoordKey = getKey(tileCoord);\n      if (cache.containsKey(tileCoordKey)) {\n        tile = /** @type {!import(\"../Tile.js\").default} */ (cache.get(tileCoordKey));\n      }\n      const key = this.getKey();\n      if (tile && tile.key == key) {\n        return tile;\n      } else {\n        const sourceTileGrid = this.getTileGridForProjection(sourceProjection);\n        const targetTileGrid = this.getTileGridForProjection(projection);\n        const wrappedTileCoord =\n            this.getTileCoordForTileUrlFunction(tileCoord, projection);\n        const newTile = new ReprojTile(\n          sourceProjection, sourceTileGrid,\n          projection, targetTileGrid,\n          tileCoord, wrappedTileCoord, this.getTilePixelRatio(pixelRatio),\n          this.getGutter(),\n          function(z, x, y, pixelRatio) {\n            return this.getTileInternal(z, x, y, pixelRatio, sourceProjection);\n          }.bind(this), this.reprojectionErrorThreshold_,\n          this.renderReprojectionEdges_);\n        newTile.key = key;\n\n        if (tile) {\n          newTile.interimTile = tile;\n          newTile.refreshInterimChain();\n          cache.replace(tileCoordKey, newTile);\n        } else {\n          cache.set(tileCoordKey, newTile);\n        }\n        return newTile;\n      }\n    }\n  }\n\n  /**\n   * @param {number} z Tile coordinate z.\n   * @param {number} x Tile coordinate x.\n   * @param {number} y Tile coordinate y.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {!import(\"../proj/Projection.js\").default} projection Projection.\n   * @return {!import(\"../Tile.js\").default} Tile.\n   * @protected\n   */\n  getTileInternal(z, x, y, pixelRatio, projection) {\n    let tile = null;\n    const tileCoordKey = getKeyZXY(z, x, y);\n    const key = this.getKey();\n    if (!this.tileCache.containsKey(tileCoordKey)) {\n      tile = this.createTile_(z, x, y, pixelRatio, projection, key);\n      this.tileCache.set(tileCoordKey, tile);\n    } else {\n      tile = this.tileCache.get(tileCoordKey);\n      if (tile.key != key) {\n        // The source's params changed. If the tile has an interim tile and if we\n        // can use it then we use it. Otherwise we create a new tile.  In both\n        // cases we attempt to assign an interim tile to the new tile.\n        const interimTile = tile;\n        tile = this.createTile_(z, x, y, pixelRatio, projection, key);\n\n        //make the new tile the head of the list,\n        if (interimTile.getState() == TileState.IDLE) {\n          //the old tile hasn't begun loading yet, and is now outdated, so we can simply discard it\n          tile.interimTile = interimTile.interimTile;\n        } else {\n          tile.interimTile = interimTile;\n        }\n        tile.refreshInterimChain();\n        this.tileCache.replace(tileCoordKey, tile);\n      }\n    }\n    return tile;\n  }\n\n  /**\n   * Sets whether to render reprojection edges or not (usually for debugging).\n   * @param {boolean} render Render the edges.\n   * @api\n   */\n  setRenderReprojectionEdges(render) {\n    if (!ENABLE_RASTER_REPROJECTION ||\n        this.renderReprojectionEdges_ == render) {\n      return;\n    }\n    this.renderReprojectionEdges_ = render;\n    for (const id in this.tileCacheForProjection) {\n      this.tileCacheForProjection[id].clear();\n    }\n    this.changed();\n  }\n\n  /**\n   * Sets the tile grid to use when reprojecting the tiles to the given\n   * projection instead of the default tile grid for the projection.\n   *\n   * This can be useful when the default tile grid cannot be created\n   * (e.g. projection has no extent defined) or\n   * for optimization reasons (custom tile size, resolutions, ...).\n   *\n   * @param {import(\"../proj.js\").ProjectionLike} projection Projection.\n   * @param {import(\"../tilegrid/TileGrid.js\").default} tilegrid Tile grid to use for the projection.\n   * @api\n   */\n  setTileGridForProjection(projection, tilegrid) {\n    if (ENABLE_RASTER_REPROJECTION) {\n      const proj = getProjection(projection);\n      if (proj) {\n        const projKey = getUid(proj);\n        if (!(projKey in this.tileGridForProjection)) {\n          this.tileGridForProjection[projKey] = tilegrid;\n        }\n      }\n    }\n  }\n}\n\n\n/**\n * @param {ImageTile} imageTile Image tile.\n * @param {string} src Source.\n */\nfunction defaultTileLoadFunction(imageTile, src) {\n  /** @type {HTMLImageElement|HTMLVideoElement} */ (imageTile.getImage()).src = src;\n}\n\nexport default TileImage;\n","/**\n * @module ol/source/WMTSRequestEncoding\n */\n\n/**\n * Request encoding. One of 'KVP', 'REST'.\n * @enum {string}\n */\nexport default {\n  KVP: 'KVP', // see spec §8\n  REST: 'REST' // see spec §10\n};\n","/**\n * @module ol/tilegrid/WMTS\n */\n\nimport {find} from '../array.js';\nimport {get as getProjection} from '../proj.js';\nimport TileGrid from './TileGrid.js';\n\n\n/**\n * @typedef {Object} Options\n * @property {import(\"../extent.js\").Extent} [extent] Extent for the tile grid. No tiles\n * outside this extent will be requested by {@link module:ol/source/Tile} sources.\n * When no `origin` or `origins` are configured, the `origin` will be set to the\n * top-left corner of the extent.\n * @property {import(\"../coordinate.js\").Coordinate} [origin] The tile grid origin, i.e.\n * where the `x` and `y` axes meet (`[z, 0, 0]`). Tile coordinates increase left\n * to right and upwards. If not specified, `extent` or `origins` must be provided.\n * @property {Array<import(\"../coordinate.js\").Coordinate>} [origins] Tile grid origins,\n * i.e. where the `x` and `y` axes meet (`[z, 0, 0]`), for each zoom level. If\n * given, the array length should match the length of the `resolutions` array, i.e.\n * each resolution can have a different origin. Tile coordinates increase left to\n * right and upwards. If not specified, `extent` or `origin` must be provided.\n * @property {!Array<number>} resolutions Resolutions. The array index of each\n * resolution needs to match the zoom level. This means that even if a `minZoom`\n * is configured, the resolutions array will have a length of `maxZoom + 1`\n * @property {!Array<string>} matrixIds matrix IDs. The length of this array needs\n * to match the length of the `resolutions` array.\n * @property {Array<import(\"../size.js\").Size>} [sizes] Number of tile rows and columns\n * of the grid for each zoom level. The values here are the `TileMatrixWidth` and\n * `TileMatrixHeight` advertised in the GetCapabilities response of the WMTS, and\n * define the grid's extent together with the `origin`.\n * An `extent` can be configured in addition, and will further limit the extent for\n * which tile requests are made by sources. Note that when the top-left corner of\n * the `extent` is used as `origin` or `origins`, then the `y` value must be\n * negative because OpenLayers tile coordinates increase upwards.\n * @property {number|import(\"../size.js\").Size} [tileSize] Tile size.\n * @property {Array<import(\"../size.js\").Size>} [tileSizes] Tile sizes. The length of\n * this array needs to match the length of the `resolutions` array.\n * @property {Array<number>} [widths] Number of tile columns that cover the grid's\n * extent for each zoom level. Only required when used with a source that has `wrapX`\n * set to `true`, and only when the grid's origin differs from the one of the\n * projection's extent. The array length has to match the length of the `resolutions`\n * array, i.e. each resolution will have a matching entry here.\n */\n\n\n/**\n * @classdesc\n * Set the grid pattern for sources accessing WMTS tiled-image servers.\n * @api\n */\nclass WMTSTileGrid extends TileGrid {\n  /**\n   * @param {Options} options WMTS options.\n   */\n  constructor(options) {\n    super({\n      extent: options.extent,\n      origin: options.origin,\n      origins: options.origins,\n      resolutions: options.resolutions,\n      tileSize: options.tileSize,\n      tileSizes: options.tileSizes,\n      sizes: options.sizes\n    });\n\n    /**\n     * @private\n     * @type {!Array<string>}\n     */\n    this.matrixIds_ = options.matrixIds;\n  }\n\n  /**\n   * @param {number} z Z.\n   * @return {string} MatrixId..\n   */\n  getMatrixId(z) {\n    return this.matrixIds_[z];\n  }\n\n  /**\n   * Get the list of matrix identifiers.\n   * @return {Array<string>} MatrixIds.\n   * @api\n   */\n  getMatrixIds() {\n    return this.matrixIds_;\n  }\n}\n\n\nexport default WMTSTileGrid;\n\n/**\n * Create a tile grid from a WMTS capabilities matrix set and an\n * optional TileMatrixSetLimits.\n * @param {Object} matrixSet An object representing a matrixSet in the\n *     capabilities document.\n * @param {import(\"../extent.js\").Extent=} opt_extent An optional extent to restrict the tile\n *     ranges the server provides.\n * @param {Array<Object>=} opt_matrixLimits An optional object representing\n *     the available matrices for tileGrid.\n * @return {WMTSTileGrid} WMTS tileGrid instance.\n * @api\n */\nexport function createFromCapabilitiesMatrixSet(matrixSet, opt_extent, opt_matrixLimits) {\n\n  /** @type {!Array<number>} */\n  const resolutions = [];\n  /** @type {!Array<string>} */\n  const matrixIds = [];\n  /** @type {!Array<import(\"../coordinate.js\").Coordinate>} */\n  const origins = [];\n  /** @type {!Array<import(\"../size.js\").Size>} */\n  const tileSizes = [];\n  /** @type {!Array<import(\"../size.js\").Size>} */\n  const sizes = [];\n\n  const matrixLimits = opt_matrixLimits !== undefined ? opt_matrixLimits : [];\n\n  const supportedCRSPropName = 'SupportedCRS';\n  const matrixIdsPropName = 'TileMatrix';\n  const identifierPropName = 'Identifier';\n  const scaleDenominatorPropName = 'ScaleDenominator';\n  const topLeftCornerPropName = 'TopLeftCorner';\n  const tileWidthPropName = 'TileWidth';\n  const tileHeightPropName = 'TileHeight';\n\n  const code = matrixSet[supportedCRSPropName];\n  const projection = getProjection(code.replace(/urn:ogc:def:crs:(\\w+):(.*:)?(\\w+)$/, '$1:$3')) ||\n      getProjection(code);\n  const metersPerUnit = projection.getMetersPerUnit();\n  // swap origin x and y coordinates if axis orientation is lat/long\n  const switchOriginXY = projection.getAxisOrientation().substr(0, 2) == 'ne';\n\n  matrixSet[matrixIdsPropName].sort(function(a, b) {\n    return b[scaleDenominatorPropName] - a[scaleDenominatorPropName];\n  });\n\n  matrixSet[matrixIdsPropName].forEach(function(elt) {\n\n    let matrixAvailable;\n    // use of matrixLimits to filter TileMatrices from GetCapabilities\n    // TileMatrixSet from unavailable matrix levels.\n    if (matrixLimits.length > 0) {\n      matrixAvailable = find(matrixLimits, function(elt_ml) {\n        if (elt[identifierPropName] == elt_ml[matrixIdsPropName]) {\n          return true;\n        }\n        // Fallback for tileMatrix identifiers that don't get prefixed\n        // by their tileMatrixSet identifiers.\n        if (elt[identifierPropName].indexOf(':') === -1) {\n          return matrixSet[identifierPropName] + ':' + elt[identifierPropName] === elt_ml[matrixIdsPropName];\n        }\n        return false;\n      });\n    } else {\n      matrixAvailable = true;\n    }\n\n    if (matrixAvailable) {\n      matrixIds.push(elt[identifierPropName]);\n      const resolution = elt[scaleDenominatorPropName] * 0.28E-3 / metersPerUnit;\n      const tileWidth = elt[tileWidthPropName];\n      const tileHeight = elt[tileHeightPropName];\n      if (switchOriginXY) {\n        origins.push([elt[topLeftCornerPropName][1],\n          elt[topLeftCornerPropName][0]]);\n      } else {\n        origins.push(elt[topLeftCornerPropName]);\n      }\n      resolutions.push(resolution);\n      tileSizes.push(tileWidth == tileHeight ?\n        tileWidth : [tileWidth, tileHeight]);\n      // top-left origin, so height is negative\n      sizes.push([elt['MatrixWidth'], -elt['MatrixHeight']]);\n    }\n  });\n\n  return new WMTSTileGrid({\n    extent: opt_extent,\n    origins: origins,\n    resolutions: resolutions,\n    matrixIds: matrixIds,\n    tileSizes: tileSizes,\n    sizes: sizes\n  });\n}\n","/**\n * @module ol/uri\n */\n\n\n/**\n * Appends query parameters to a URI.\n *\n * @param {string} uri The original URI, which may already have query data.\n * @param {!Object} params An object where keys are URI-encoded parameter keys,\n *     and the values are arbitrary types or arrays.\n * @return {string} The new URI.\n */\nexport function appendParams(uri, params) {\n  const keyParams = [];\n  // Skip any null or undefined parameter values\n  Object.keys(params).forEach(function(k) {\n    if (params[k] !== null && params[k] !== undefined) {\n      keyParams.push(k + '=' + encodeURIComponent(params[k]));\n    }\n  });\n  const qs = keyParams.join('&');\n  // remove any trailing ? or &\n  uri = uri.replace(/[?&]$/, '');\n  // append ? or & depending on whether uri has existing parameters\n  uri = uri.indexOf('?') === -1 ? uri + '?' : uri + '&';\n  return uri + qs;\n}\n","/**\n * @module ol/source/WMTS\n */\n\nimport {expandUrl, createFromTileUrlFunctions, nullTileUrlFunction} from '../tileurlfunction.js';\nimport {find, findIndex, includes} from '../array.js';\nimport {containsExtent} from '../extent.js';\nimport {assign} from '../obj.js';\nimport {get as getProjection, equivalent, transformExtent} from '../proj.js';\nimport TileImage from './TileImage.js';\nimport WMTSRequestEncoding from './WMTSRequestEncoding.js';\nimport {createFromCapabilitiesMatrixSet} from '../tilegrid/WMTS.js';\nimport {appendParams} from '../uri.js';\n\n/**\n * @typedef {Object} Options\n * @property {import(\"./Source.js\").AttributionLike} [attributions] Attributions.\n * @property {number} [cacheSize=2048] Cache size.\n * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that\n * you must provide a `crossOrigin` value if you are using the WebGL renderer or if you want to\n * access pixel data with the Canvas renderer.  See\n * https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.\n * @property {import(\"../tilegrid/WMTS.js\").default} tileGrid Tile grid.\n * @property {import(\"../proj.js\").ProjectionLike} projection Projection.\n * @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).\n * Higher values can increase reprojection performance, but decrease precision.\n * @property {import(\"./WMTSRequestEncoding.js\").default|string} [requestEncoding='KVP'] Request encoding.\n * @property {string} layer Layer name as advertised in the WMTS capabilities.\n * @property {string} style Style name as advertised in the WMTS capabilities.\n * @property {typeof import(\"../ImageTile.js\").default} [tileClass]  Class used to instantiate image tiles. Default is {@link module:ol/ImageTile~ImageTile}.\n * @property {number} [tilePixelRatio=1] The pixel ratio used by the tile service.\n * For example, if the tile service advertizes 256px by 256px tiles but actually sends 512px\n * by 512px images (for retina/hidpi devices) then `tilePixelRatio`\n * should be set to `2`.\n * @property {string} [format='image/jpeg'] Image format. Only used when `requestEncoding` is `'KVP'`.\n * @property {string} [version='1.0.0'] WMTS version.\n * @property {string} matrixSet Matrix set.\n * @property {!Object} [dimensions] Additional \"dimensions\" for tile requests.\n * This is an object with properties named like the advertised WMTS dimensions.\n * @property {string} [url]  A URL for the service.\n * For the RESTful request encoding, this is a URL\n * template.  For KVP encoding, it is normal URL. A `{?-?}` template pattern,\n * for example `subdomain{a-f}.domain.com`, may be used instead of defining\n * each one separately in the `urls` option.\n * @property {import(\"../Tile.js\").LoadFunction} [tileLoadFunction] Optional function to load a tile given a URL. The default is\n * ```js\n * function(imageTile, src) {\n *   imageTile.getImage().src = src;\n * };\n * ```\n * @property {Array<string>} [urls] An array of URLs.\n * Requests will be distributed among the URLs in this array.\n * @property {boolean} [wrapX=false] Whether to wrap the world horizontally.\n * @property {number} [transition] Duration of the opacity transition for rendering.\n * To disable the opacity transition, pass `transition: 0`.\n */\n\n\n/**\n * @classdesc\n * Layer source for tile data from WMTS servers.\n * @api\n */\nclass WMTS extends TileImage {\n  /**\n   * @param {Options} options WMTS options.\n   */\n  constructor(options) {\n\n    // TODO: add support for TileMatrixLimits\n\n    const requestEncoding = options.requestEncoding !== undefined ?\n      /** @type {import(\"./WMTSRequestEncoding.js\").default} */ (options.requestEncoding) :\n      WMTSRequestEncoding.KVP;\n\n    // FIXME: should we create a default tileGrid?\n    // we could issue a getCapabilities xhr to retrieve missing configuration\n    const tileGrid = options.tileGrid;\n\n    let urls = options.urls;\n    if (urls === undefined && options.url !== undefined) {\n      urls = expandUrl(options.url);\n    }\n\n    super({\n      attributions: options.attributions,\n      cacheSize: options.cacheSize,\n      crossOrigin: options.crossOrigin,\n      projection: options.projection,\n      reprojectionErrorThreshold: options.reprojectionErrorThreshold,\n      tileClass: options.tileClass,\n      tileGrid: tileGrid,\n      tileLoadFunction: options.tileLoadFunction,\n      tilePixelRatio: options.tilePixelRatio,\n      tileUrlFunction: nullTileUrlFunction,\n      urls: urls,\n      wrapX: options.wrapX !== undefined ? options.wrapX : false,\n      transition: options.transition\n    });\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.version_ = options.version !== undefined ? options.version : '1.0.0';\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.format_ = options.format !== undefined ? options.format : 'image/jpeg';\n\n    /**\n     * @private\n     * @type {!Object}\n     */\n    this.dimensions_ = options.dimensions !== undefined ? options.dimensions : {};\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.layer_ = options.layer;\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.matrixSet_ = options.matrixSet;\n\n    /**\n     * @private\n     * @type {string}\n     */\n    this.style_ = options.style;\n\n    // FIXME: should we guess this requestEncoding from options.url(s)\n    //        structure? that would mean KVP only if a template is not provided.\n\n    /**\n     * @private\n     * @type {import(\"./WMTSRequestEncoding.js\").default}\n     */\n    this.requestEncoding_ = requestEncoding;\n\n    this.setKey(this.getKeyForDimensions_());\n\n    if (urls && urls.length > 0) {\n      this.tileUrlFunction = createFromTileUrlFunctions(urls.map(createFromWMTSTemplate.bind(this)));\n    }\n\n  }\n\n  /**\n   * Set the URLs to use for requests.\n   * URLs may contain OCG conform URL Template Variables: {TileMatrix}, {TileRow}, {TileCol}.\n   * @override\n   */\n  setUrls(urls) {\n    this.urls = urls;\n    const key = urls.join('\\n');\n    this.setTileUrlFunction(createFromTileUrlFunctions(urls.map(createFromWMTSTemplate.bind(this))), key);\n  }\n\n  /**\n   * Get the dimensions, i.e. those passed to the constructor through the\n   * \"dimensions\" option, and possibly updated using the updateDimensions\n   * method.\n   * @return {!Object} Dimensions.\n   * @api\n   */\n  getDimensions() {\n    return this.dimensions_;\n  }\n\n\n  /**\n   * Return the image format of the WMTS source.\n   * @return {string} Format.\n   * @api\n   */\n  getFormat() {\n    return this.format_;\n  }\n\n\n  /**\n   * Return the layer of the WMTS source.\n   * @return {string} Layer.\n   * @api\n   */\n  getLayer() {\n    return this.layer_;\n  }\n\n\n  /**\n   * Return the matrix set of the WMTS source.\n   * @return {string} MatrixSet.\n   * @api\n   */\n  getMatrixSet() {\n    return this.matrixSet_;\n  }\n\n\n  /**\n   * Return the request encoding, either \"KVP\" or \"REST\".\n   * @return {import(\"./WMTSRequestEncoding.js\").default} Request encoding.\n   * @api\n   */\n  getRequestEncoding() {\n    return this.requestEncoding_;\n  }\n\n\n  /**\n   * Return the style of the WMTS source.\n   * @return {string} Style.\n   * @api\n   */\n  getStyle() {\n    return this.style_;\n  }\n\n\n  /**\n   * Return the version of the WMTS source.\n   * @return {string} Version.\n   * @api\n   */\n  getVersion() {\n    return this.version_;\n  }\n\n\n  /**\n   * @private\n   * @return {string} The key for the current dimensions.\n   */\n  getKeyForDimensions_() {\n    let i = 0;\n    const res = [];\n    for (const key in this.dimensions_) {\n      res[i++] = key + '-' + this.dimensions_[key];\n    }\n    return res.join('/');\n  }\n\n\n  /**\n   * Update the dimensions.\n   * @param {Object} dimensions Dimensions.\n   * @api\n   */\n  updateDimensions(dimensions) {\n    assign(this.dimensions_, dimensions);\n    this.setKey(this.getKeyForDimensions_());\n  }\n\n}\n\nexport default WMTS;\n\n/**\n * Generate source options from a capabilities object.\n * @param {Object} wmtsCap An object representing the capabilities document.\n * @param {!Object} config Configuration properties for the layer.  Defaults for\n *                  the layer will apply if not provided.\n *\n * Required config properties:\n *  - layer - {string} The layer identifier.\n *\n * Optional config properties:\n *  - matrixSet - {string} The matrix set identifier, required if there is\n *       more than one matrix set in the layer capabilities.\n *  - projection - {string} The desired CRS when no matrixSet is specified.\n *       eg: \"EPSG:3857\". If the desired projection is not available,\n *       an error is thrown.\n *  - requestEncoding - {string} url encoding format for the layer. Default is\n *       the first tile url format found in the GetCapabilities response.\n *  - style - {string} The name of the style\n *  - format - {string} Image format for the layer. Default is the first\n *       format returned in the GetCapabilities response.\n *  - crossOrigin - {string|null|undefined} Cross origin. Default is `undefined`.\n * @return {?Options} WMTS source options object or `null` if the layer was not found.\n * @api\n */\nexport function optionsFromCapabilities(wmtsCap, config) {\n  const layers = wmtsCap['Contents']['Layer'];\n  const l = find(layers, function(elt, index, array) {\n    return elt['Identifier'] == config['layer'];\n  });\n  if (l === null) {\n    return null;\n  }\n  const tileMatrixSets = wmtsCap['Contents']['TileMatrixSet'];\n  let idx;\n  if (l['TileMatrixSetLink'].length > 1) {\n    if ('projection' in config) {\n      idx = findIndex(l['TileMatrixSetLink'],\n        function(elt, index, array) {\n          const tileMatrixSet = find(tileMatrixSets, function(el) {\n            return el['Identifier'] == elt['TileMatrixSet'];\n          });\n          const supportedCRS = tileMatrixSet['SupportedCRS'];\n          const proj1 = getProjection(supportedCRS.replace(/urn:ogc:def:crs:(\\w+):(.*:)?(\\w+)$/, '$1:$3')) ||\n                getProjection(supportedCRS);\n          const proj2 = getProjection(config['projection']);\n          if (proj1 && proj2) {\n            return equivalent(proj1, proj2);\n          } else {\n            return supportedCRS == config['projection'];\n          }\n        });\n    } else {\n      idx = findIndex(l['TileMatrixSetLink'],\n        function(elt, index, array) {\n          return elt['TileMatrixSet'] == config['matrixSet'];\n        });\n    }\n  } else {\n    idx = 0;\n  }\n  if (idx < 0) {\n    idx = 0;\n  }\n  const matrixSet = /** @type {string} */\n    (l['TileMatrixSetLink'][idx]['TileMatrixSet']);\n  const matrixLimits = /** @type {Array<Object>} */\n    (l['TileMatrixSetLink'][idx]['TileMatrixSetLimits']);\n\n  let format = /** @type {string} */ (l['Format'][0]);\n  if ('format' in config) {\n    format = config['format'];\n  }\n  idx = findIndex(l['Style'], function(elt, index, array) {\n    if ('style' in config) {\n      return elt['Title'] == config['style'];\n    } else {\n      return elt['isDefault'];\n    }\n  });\n  if (idx < 0) {\n    idx = 0;\n  }\n  const style = /** @type {string} */ (l['Style'][idx]['Identifier']);\n\n  const dimensions = {};\n  if ('Dimension' in l) {\n    l['Dimension'].forEach(function(elt, index, array) {\n      const key = elt['Identifier'];\n      let value = elt['Default'];\n      if (value === undefined) {\n        value = elt['Value'][0];\n      }\n      dimensions[key] = value;\n    });\n  }\n\n  const matrixSets = wmtsCap['Contents']['TileMatrixSet'];\n  const matrixSetObj = find(matrixSets, function(elt, index, array) {\n    return elt['Identifier'] == matrixSet;\n  });\n\n  let projection;\n  const code = matrixSetObj['SupportedCRS'];\n  if (code) {\n    projection = getProjection(code.replace(/urn:ogc:def:crs:(\\w+):(.*:)?(\\w+)$/, '$1:$3')) ||\n        getProjection(code);\n  }\n  if ('projection' in config) {\n    const projConfig = getProjection(config['projection']);\n    if (projConfig) {\n      if (!projection || equivalent(projConfig, projection)) {\n        projection = projConfig;\n      }\n    }\n  }\n\n  const wgs84BoundingBox = l['WGS84BoundingBox'];\n  let extent, wrapX;\n  if (wgs84BoundingBox !== undefined) {\n    const wgs84ProjectionExtent = getProjection('EPSG:4326').getExtent();\n    wrapX = (wgs84BoundingBox[0] == wgs84ProjectionExtent[0] &&\n        wgs84BoundingBox[2] == wgs84ProjectionExtent[2]);\n    extent = transformExtent(\n      wgs84BoundingBox, 'EPSG:4326', projection);\n    const projectionExtent = projection.getExtent();\n    if (projectionExtent) {\n      // If possible, do a sanity check on the extent - it should never be\n      // bigger than the validity extent of the projection of a matrix set.\n      if (!containsExtent(projectionExtent, extent)) {\n        extent = undefined;\n      }\n    }\n  }\n\n  const tileGrid = createFromCapabilitiesMatrixSet(matrixSetObj, extent, matrixLimits);\n\n  /** @type {!Array<string>} */\n  const urls = [];\n  let requestEncoding = config['requestEncoding'];\n  requestEncoding = requestEncoding !== undefined ? requestEncoding : '';\n\n  if ('OperationsMetadata' in wmtsCap && 'GetTile' in wmtsCap['OperationsMetadata']) {\n    const gets = wmtsCap['OperationsMetadata']['GetTile']['DCP']['HTTP']['Get'];\n\n    for (let i = 0, ii = gets.length; i < ii; ++i) {\n      if (gets[i]['Constraint']) {\n        const constraint = find(gets[i]['Constraint'], function(element) {\n          return element['name'] == 'GetEncoding';\n        });\n        const encodings = constraint['AllowedValues']['Value'];\n\n        if (requestEncoding === '') {\n          // requestEncoding not provided, use the first encoding from the list\n          requestEncoding = encodings[0];\n        }\n        if (requestEncoding === WMTSRequestEncoding.KVP) {\n          if (includes(encodings, WMTSRequestEncoding.KVP)) {\n            urls.push(/** @type {string} */ (gets[i]['href']));\n          }\n        } else {\n          break;\n        }\n      } else if (gets[i]['href']) {\n        requestEncoding = WMTSRequestEncoding.KVP;\n        urls.push(/** @type {string} */ (gets[i]['href']));\n      }\n    }\n  }\n  if (urls.length === 0) {\n    requestEncoding = WMTSRequestEncoding.REST;\n    l['ResourceURL'].forEach(function(element) {\n      if (element['resourceType'] === 'tile') {\n        format = element['format'];\n        urls.push(/** @type {string} */ (element['template']));\n      }\n    });\n  }\n\n  return {\n    urls: urls,\n    layer: config['layer'],\n    matrixSet: matrixSet,\n    format: format,\n    projection: projection,\n    requestEncoding: requestEncoding,\n    tileGrid: tileGrid,\n    style: style,\n    dimensions: dimensions,\n    wrapX: wrapX,\n    crossOrigin: config['crossOrigin']\n  };\n}\n\n/**\n * @param {string} template Template.\n * @return {import(\"../Tile.js\").UrlFunction} Tile URL function.\n * @this {WMTS}\n */\nfunction createFromWMTSTemplate(template) {\n  const requestEncoding = this.requestEncoding_;\n\n  // context property names are lower case to allow for a case insensitive\n  // replacement as some services use different naming conventions\n  const context = {\n    'layer': this.layer_,\n    'style': this.style_,\n    'tilematrixset': this.matrixSet_\n  };\n\n  if (requestEncoding == WMTSRequestEncoding.KVP) {\n    assign(context, {\n      'Service': 'WMTS',\n      'Request': 'GetTile',\n      'Version': this.version_,\n      'Format': this.format_\n    });\n  }\n\n  // TODO: we may want to create our own appendParams function so that params\n  // order conforms to wmts spec guidance, and so that we can avoid to escape\n  // special template params\n\n  template = (requestEncoding == WMTSRequestEncoding.KVP) ?\n    appendParams(template, context) :\n    template.replace(/\\{(\\w+?)\\}/g, function(m, p) {\n      return (p.toLowerCase() in context) ? context[p.toLowerCase()] : m;\n    });\n\n  const tileGrid = /** @type {import(\"../tilegrid/WMTS.js\").default} */ (\n    this.tileGrid);\n  const dimensions = this.dimensions_;\n\n  return (\n    /**\n     * @param {import(\"../tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n     * @param {number} pixelRatio Pixel ratio.\n     * @param {import(\"../proj/Projection.js\").default} projection Projection.\n     * @return {string|undefined} Tile URL.\n     */\n    function(tileCoord, pixelRatio, projection) {\n      if (!tileCoord) {\n        return undefined;\n      } else {\n        const localContext = {\n          'TileMatrix': tileGrid.getMatrixId(tileCoord[0]),\n          'TileCol': tileCoord[1],\n          'TileRow': -tileCoord[2] - 1\n        };\n        assign(localContext, dimensions);\n        let url = template;\n        if (requestEncoding == WMTSRequestEncoding.KVP) {\n          url = appendParams(url, localContext);\n        } else {\n          url = url.replace(/\\{(\\w+?)\\}/g, function(m, p) {\n            return localContext[p];\n          });\n        }\n        return url;\n      }\n    }\n  );\n}\n","/**\n * @module ol/source/common\n */\n\n/**\n * Default WMS version.\n * @type {string}\n */\nexport const DEFAULT_WMS_VERSION = '1.3.0';\n","/**\n * @module ol/source/WMSServerType\n */\n\n/**\n * Available server types: `'carmentaserver'`, `'geoserver'`, `'mapserver'`,\n *     `'qgis'`. These are servers that have vendor parameters beyond the WMS\n *     specification that OpenLayers can make use of.\n * @enum {string}\n */\nexport default {\n  CARMENTA_SERVER: 'carmentaserver',\n  GEOSERVER: 'geoserver',\n  MAPSERVER: 'mapserver',\n  QGIS: 'qgis'\n};\n","/**\n * @module ol/source/TileWMS\n */\n\nimport {DEFAULT_WMS_VERSION} from './common.js';\n\nimport {assert} from '../asserts.js';\nimport {buffer, createEmpty} from '../extent.js';\nimport {assign} from '../obj.js';\nimport {modulo} from '../math.js';\nimport {get as getProjection, transform, transformExtent} from '../proj.js';\nimport {calculateSourceResolution} from '../reproj.js';\nimport {toSize, buffer as bufferSize, scale as scaleSize} from '../size.js';\nimport TileImage from './TileImage.js';\nimport WMSServerType from './WMSServerType.js';\nimport {hash as tileCoordHash} from '../tilecoord.js';\nimport {compareVersions} from '../string.js';\nimport {appendParams} from '../uri.js';\n\n/**\n * @typedef {Object} Options\n * @property {import(\"./Source.js\").AttributionLike} [attributions] Attributions.\n * @property {number} [cacheSize=2048] Cache size.\n * @property {null|string} [crossOrigin] The `crossOrigin` attribute for loaded images.  Note that\n * you must provide a `crossOrigin` value if you are using the WebGL renderer or if you want to\n * access pixel data with the Canvas renderer.  See\n * https://developer.mozilla.org/en-US/docs/Web/HTML/CORS_enabled_image for more detail.\n * @property {Object<string,*>} params WMS request parameters.\n * At least a `LAYERS` param is required. `STYLES` is\n * `''` by default. `VERSION` is `1.3.0` by default. `WIDTH`, `HEIGHT`, `BBOX`\n * and `CRS` (`SRS` for WMS version < 1.3.0) will be set dynamically.\n * @property {number} [gutter=0]\n * The size in pixels of the gutter around image tiles to ignore. By setting\n * this property to a non-zero value, images will be requested that are wider\n * and taller than the tile size by a value of `2 x gutter`.\n * Using a non-zero value allows artifacts of rendering at tile edges to be\n * ignored. If you control the WMS service it is recommended to address\n * \"artifacts at tile edges\" issues by properly configuring the WMS service. For\n * example, MapServer has a `tile_map_edge_buffer` configuration parameter for\n * this. See http://mapserver.org/output/tile_mode.html.\n * @property {boolean} [hidpi=true] Use the `ol/Map#pixelRatio` value when requesting\n * the image from the remote server.\n * @property {import(\"../proj.js\").ProjectionLike} projection Projection.\n * @property {number} [reprojectionErrorThreshold=0.5] Maximum allowed reprojection error (in pixels).\n * Higher values can increase reprojection performance, but decrease precision.\n * @property {typeof import(\"../ImageTile.js\").default} [tileClass] Class used to instantiate image tiles.\n * Default is {@link module:ol/ImageTile~ImageTile}.\n * @property {import(\"../tilegrid/TileGrid.js\").default} [tileGrid] Tile grid. Base this on the resolutions,\n * tilesize and extent supported by the server.\n * If this is not defined, a default grid will be used: if there is a projection\n * extent, the grid will be based on that; if not, a grid based on a global\n * extent with origin at 0,0 will be used..\n * @property {import(\"./WMSServerType.js\").default|string} [serverType]\n * The type of the remote WMS server. Currently only used when `hidpi` is\n * `true`.\n * @property {import(\"../Tile.js\").LoadFunction} [tileLoadFunction] Optional function to load a tile given a URL. The default is\n * ```js\n * function(imageTile, src) {\n *   imageTile.getImage().src = src;\n * };\n * ```\n * @property {string} [url] WMS service URL.\n * @property {Array<string>} [urls] WMS service urls.\n * Use this instead of `url` when the WMS supports multiple urls for GetMap requests.\n * @property {boolean} [wrapX=true] Whether to wrap the world horizontally.\n * When set to `false`, only one world\n * will be rendered. When `true`, tiles will be requested for one world only,\n * but they will be wrapped horizontally to render multiple worlds.\n * @property {number} [transition] Duration of the opacity transition for rendering.\n * To disable the opacity transition, pass `transition: 0`.\n */\n\n\n/**\n * @classdesc\n * Layer source for tile data from WMS servers.\n * @api\n */\nclass TileWMS extends TileImage {\n  /**\n   * @param {Options=} [opt_options] Tile WMS options.\n   */\n  constructor(opt_options) {\n\n    const options = opt_options || /** @type {Options} */ ({});\n\n    const params = options.params || {};\n\n    const transparent = 'TRANSPARENT' in params ? params['TRANSPARENT'] : true;\n\n    super({\n      attributions: options.attributions,\n      cacheSize: options.cacheSize,\n      crossOrigin: options.crossOrigin,\n      opaque: !transparent,\n      projection: options.projection,\n      reprojectionErrorThreshold: options.reprojectionErrorThreshold,\n      tileClass: options.tileClass,\n      tileGrid: options.tileGrid,\n      tileLoadFunction: options.tileLoadFunction,\n      tileUrlFunction: tileUrlFunction,\n      url: options.url,\n      urls: options.urls,\n      wrapX: options.wrapX !== undefined ? options.wrapX : true,\n      transition: options.transition\n    });\n\n    /**\n     * @private\n     * @type {number}\n     */\n    this.gutter_ = options.gutter !== undefined ? options.gutter : 0;\n\n    /**\n     * @private\n     * @type {!Object}\n     */\n    this.params_ = params;\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.v13_ = true;\n\n    /**\n     * @private\n     * @type {import(\"./WMSServerType.js\").default|undefined}\n     */\n    this.serverType_ = /** @type {import(\"./WMSServerType.js\").default|undefined} */ (options.serverType);\n\n    /**\n     * @private\n     * @type {boolean}\n     */\n    this.hidpi_ = options.hidpi !== undefined ? options.hidpi : true;\n\n    /**\n     * @private\n     * @type {import(\"../extent.js\").Extent}\n     */\n    this.tmpExtent_ = createEmpty();\n\n    this.updateV13_();\n    this.setKey(this.getKeyForParams_());\n\n  }\n\n  /**\n   * Return the GetFeatureInfo URL for the passed coordinate, resolution, and\n   * projection. Return `undefined` if the GetFeatureInfo URL cannot be\n   * constructed.\n   * @param {import(\"../coordinate.js\").Coordinate} coordinate Coordinate.\n   * @param {number} resolution Resolution.\n   * @param {import(\"../proj.js\").ProjectionLike} projection Projection.\n   * @param {!Object} params GetFeatureInfo params. `INFO_FORMAT` at least should\n   *     be provided. If `QUERY_LAYERS` is not provided then the layers specified\n   *     in the `LAYERS` parameter will be used. `VERSION` should not be\n   *     specified here.\n   * @return {string|undefined} GetFeatureInfo URL.\n   * @api\n   */\n  getGetFeatureInfoUrl(coordinate, resolution, projection, params) {\n    const projectionObj = getProjection(projection);\n    const sourceProjectionObj = this.getProjection();\n\n    let tileGrid = this.getTileGrid();\n    if (!tileGrid) {\n      tileGrid = this.getTileGridForProjection(projectionObj);\n    }\n\n    const tileCoord = tileGrid.getTileCoordForCoordAndResolution(coordinate, resolution);\n\n    if (tileGrid.getResolutions().length <= tileCoord[0]) {\n      return undefined;\n    }\n\n    let tileResolution = tileGrid.getResolution(tileCoord[0]);\n    let tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent_);\n    let tileSize = toSize(tileGrid.getTileSize(tileCoord[0]), this.tmpSize);\n\n\n    const gutter = this.gutter_;\n    if (gutter !== 0) {\n      tileSize = bufferSize(tileSize, gutter, this.tmpSize);\n      tileExtent = buffer(tileExtent, tileResolution * gutter, tileExtent);\n    }\n\n    if (sourceProjectionObj && sourceProjectionObj !== projectionObj) {\n      tileResolution = calculateSourceResolution(sourceProjectionObj, projectionObj, coordinate, tileResolution);\n      tileExtent = transformExtent(tileExtent, projectionObj, sourceProjectionObj);\n      coordinate = transform(coordinate, projectionObj, sourceProjectionObj);\n    }\n\n    const baseParams = {\n      'SERVICE': 'WMS',\n      'VERSION': DEFAULT_WMS_VERSION,\n      'REQUEST': 'GetFeatureInfo',\n      'FORMAT': 'image/png',\n      'TRANSPARENT': true,\n      'QUERY_LAYERS': this.params_['LAYERS']\n    };\n    assign(baseParams, this.params_, params);\n\n    const x = Math.floor((coordinate[0] - tileExtent[0]) / tileResolution);\n    const y = Math.floor((tileExtent[3] - coordinate[1]) / tileResolution);\n\n    baseParams[this.v13_ ? 'I' : 'X'] = x;\n    baseParams[this.v13_ ? 'J' : 'Y'] = y;\n\n    return this.getRequestUrl_(tileCoord, tileSize, tileExtent,\n      1, sourceProjectionObj || projectionObj, baseParams);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getGutter() {\n    return this.gutter_;\n  }\n\n  /**\n   * Get the user-provided params, i.e. those passed to the constructor through\n   * the \"params\" option, and possibly updated using the updateParams method.\n   * @return {Object} Params.\n   * @api\n   */\n  getParams() {\n    return this.params_;\n  }\n\n  /**\n   * @param {import(\"../tilecoord.js\").TileCoord} tileCoord Tile coordinate.\n   * @param {import(\"../size.js\").Size} tileSize Tile size.\n   * @param {import(\"../extent.js\").Extent} tileExtent Tile extent.\n   * @param {number} pixelRatio Pixel ratio.\n   * @param {import(\"../proj/Projection.js\").default} projection Projection.\n   * @param {Object} params Params.\n   * @return {string|undefined} Request URL.\n   * @private\n   */\n  getRequestUrl_(tileCoord, tileSize, tileExtent, pixelRatio, projection, params) {\n\n    const urls = this.urls;\n    if (!urls) {\n      return undefined;\n    }\n\n    params['WIDTH'] = tileSize[0];\n    params['HEIGHT'] = tileSize[1];\n\n    params[this.v13_ ? 'CRS' : 'SRS'] = projection.getCode();\n\n    if (!('STYLES' in this.params_)) {\n      params['STYLES'] = '';\n    }\n\n    if (pixelRatio != 1) {\n      switch (this.serverType_) {\n        case WMSServerType.GEOSERVER:\n          const dpi = (90 * pixelRatio + 0.5) | 0;\n          if ('FORMAT_OPTIONS' in params) {\n            params['FORMAT_OPTIONS'] += ';dpi:' + dpi;\n          } else {\n            params['FORMAT_OPTIONS'] = 'dpi:' + dpi;\n          }\n          break;\n        case WMSServerType.MAPSERVER:\n          params['MAP_RESOLUTION'] = 90 * pixelRatio;\n          break;\n        case WMSServerType.CARMENTA_SERVER:\n        case WMSServerType.QGIS:\n          params['DPI'] = 90 * pixelRatio;\n          break;\n        default:\n          assert(false, 52); // Unknown `serverType` configured\n          break;\n      }\n    }\n\n    const axisOrientation = projection.getAxisOrientation();\n    const bbox = tileExtent;\n    if (this.v13_ && axisOrientation.substr(0, 2) == 'ne') {\n      let tmp;\n      tmp = tileExtent[0];\n      bbox[0] = tileExtent[1];\n      bbox[1] = tmp;\n      tmp = tileExtent[2];\n      bbox[2] = tileExtent[3];\n      bbox[3] = tmp;\n    }\n    params['BBOX'] = bbox.join(',');\n\n    let url;\n    if (urls.length == 1) {\n      url = urls[0];\n    } else {\n      const index = modulo(tileCoordHash(tileCoord), urls.length);\n      url = urls[index];\n    }\n    return appendParams(url, params);\n  }\n\n  /**\n   * @inheritDoc\n   */\n  getTilePixelRatio(pixelRatio) {\n    return (!this.hidpi_ || this.serverType_ === undefined) ? 1 :\n    /** @type {number} */ (pixelRatio);\n  }\n\n  /**\n   * @private\n   * @return {string} The key for the current params.\n   */\n  getKeyForParams_() {\n    let i = 0;\n    const res = [];\n    for (const key in this.params_) {\n      res[i++] = key + '-' + this.params_[key];\n    }\n    return res.join('/');\n  }\n\n  /**\n   * Update the user-provided params.\n   * @param {Object} params Params.\n   * @api\n   */\n  updateParams(params) {\n    assign(this.params_, params);\n    this.updateV13_();\n    this.setKey(this.getKeyForParams_());\n  }\n\n  /**\n   * @private\n   */\n  updateV13_() {\n    const version = this.params_['VERSION'] || DEFAULT_WMS_VERSION;\n    this.v13_ = compareVersions(version, '1.3') >= 0;\n  }\n}\n\n/**\n * @param {import(\"../tilecoord.js\").TileCoord} tileCoord The tile coordinate\n * @param {number} pixelRatio The pixel ratio\n * @param {import(\"../proj/Projection.js\").default} projection The projection\n * @return {string|undefined} The tile URL\n * @this {TileWMS}\n */\nfunction tileUrlFunction(tileCoord, pixelRatio, projection) {\n\n  let tileGrid = this.getTileGrid();\n  if (!tileGrid) {\n    tileGrid = this.getTileGridForProjection(projection);\n  }\n\n  if (tileGrid.getResolutions().length <= tileCoord[0]) {\n    return undefined;\n  }\n\n  if (pixelRatio != 1 && (!this.hidpi_ || this.serverType_ === undefined)) {\n    pixelRatio = 1;\n  }\n\n  const tileResolution = tileGrid.getResolution(tileCoord[0]);\n  let tileExtent = tileGrid.getTileCoordExtent(tileCoord, this.tmpExtent_);\n  let tileSize = toSize(\n    tileGrid.getTileSize(tileCoord[0]), this.tmpSize);\n\n  const gutter = this.gutter_;\n  if (gutter !== 0) {\n    tileSize = bufferSize(tileSize, gutter, this.tmpSize);\n    tileExtent = buffer(tileExtent, tileResolution * gutter, tileExtent);\n  }\n\n  if (pixelRatio != 1) {\n    tileSize = scaleSize(tileSize, pixelRatio, this.tmpSize);\n  }\n\n  const baseParams = {\n    'SERVICE': 'WMS',\n    'VERSION': DEFAULT_WMS_VERSION,\n    'REQUEST': 'GetMap',\n    'FORMAT': 'image/png',\n    'TRANSPARENT': true\n  };\n  assign(baseParams, this.params_);\n\n  return this.getRequestUrl_(tileCoord, tileSize, tileExtent,\n    pixelRatio, projection, baseParams);\n}\n\n\nexport default TileWMS;\n","(function (global, factory) {\n\ttypeof exports === 'object' && typeof module !== 'undefined' ? module.exports = factory(require('ol/control/Control'), require('ol/Observable')) :\n\ttypeof define === 'function' && define.amd ? define(['ol/control/Control', 'ol/Observable'], factory) :\n\t(global.LayerSwitcher = factory(global.ol.control.Control,global.ol.Observable));\n}(this, (function (Control,ol_Observable) { 'use strict';\n\nControl = 'default' in Control ? Control['default'] : Control;\n\nvar classCallCheck = function (instance, Constructor) {\n  if (!(instance instanceof Constructor)) {\n    throw new TypeError(\"Cannot call a class as a function\");\n  }\n};\n\nvar createClass = function () {\n  function defineProperties(target, props) {\n    for (var i = 0; i < props.length; i++) {\n      var descriptor = props[i];\n      descriptor.enumerable = descriptor.enumerable || false;\n      descriptor.configurable = true;\n      if (\"value\" in descriptor) descriptor.writable = true;\n      Object.defineProperty(target, descriptor.key, descriptor);\n    }\n  }\n\n  return function (Constructor, protoProps, staticProps) {\n    if (protoProps) defineProperties(Constructor.prototype, protoProps);\n    if (staticProps) defineProperties(Constructor, staticProps);\n    return Constructor;\n  };\n}();\n\n\n\n\n\n\n\nvar get = function get(object, property, receiver) {\n  if (object === null) object = Function.prototype;\n  var desc = Object.getOwnPropertyDescriptor(object, property);\n\n  if (desc === undefined) {\n    var parent = Object.getPrototypeOf(object);\n\n    if (parent === null) {\n      return undefined;\n    } else {\n      return get(parent, property, receiver);\n    }\n  } else if (\"value\" in desc) {\n    return desc.value;\n  } else {\n    var getter = desc.get;\n\n    if (getter === undefined) {\n      return undefined;\n    }\n\n    return getter.call(receiver);\n  }\n};\n\nvar inherits = function (subClass, superClass) {\n  if (typeof superClass !== \"function\" && superClass !== null) {\n    throw new TypeError(\"Super expression must either be null or a function, not \" + typeof superClass);\n  }\n\n  subClass.prototype = Object.create(superClass && superClass.prototype, {\n    constructor: {\n      value: subClass,\n      enumerable: false,\n      writable: true,\n      configurable: true\n    }\n  });\n  if (superClass) Object.setPrototypeOf ? Object.setPrototypeOf(subClass, superClass) : subClass.__proto__ = superClass;\n};\n\n\n\n\n\n\n\n\n\n\n\nvar possibleConstructorReturn = function (self, call) {\n  if (!self) {\n    throw new ReferenceError(\"this hasn't been initialised - super() hasn't been called\");\n  }\n\n  return call && (typeof call === \"object\" || typeof call === \"function\") ? call : self;\n};\n\nvar CSS_PREFIX = 'layer-switcher-';\n\n/**\n * OpenLayers Layer Switcher Control.\n * See [the examples](./examples) for usage.\n * @constructor\n * @extends {ol/control/Control~Control}\n * @param {Object} opt_options Control options, extends ol/control/Control~Control#options adding:\n * @param {String} opt_options.tipLabel the button tooltip.\n * @param {String} opt_options.groupSelectStyle either `'none'` - groups don't get a checkbox,\n *   `'children'` (default) groups have a checkbox and affect child visibility or\n *   `'group'` groups have a checkbox but do not alter child visibility (like QGIS).\n */\n\nvar LayerSwitcher = function (_Control) {\n    inherits(LayerSwitcher, _Control);\n\n    function LayerSwitcher(opt_options) {\n        classCallCheck(this, LayerSwitcher);\n\n\n        var options = opt_options || {};\n\n        var tipLabel = options.tipLabel ? options.tipLabel : 'Legend';\n\n        var element = document.createElement('div');\n\n        var _this = possibleConstructorReturn(this, (LayerSwitcher.__proto__ || Object.getPrototypeOf(LayerSwitcher)).call(this, { element: element, target: options.target }));\n\n        _this.groupSelectStyle = ['none', 'children', 'group'].indexOf(options.groupSelectStyle) >= 0 ? options.groupSelectStyle : 'children';\n\n        _this.mapListeners = [];\n\n        _this.hiddenClassName = 'ol-unselectable ol-control layer-switcher';\n        if (LayerSwitcher.isTouchDevice_()) {\n            _this.hiddenClassName += ' touch';\n        }\n        _this.shownClassName = 'shown';\n\n        element.className = _this.hiddenClassName;\n\n        var button = document.createElement('button');\n        button.setAttribute('title', tipLabel);\n        element.appendChild(button);\n\n        _this.panel = document.createElement('div');\n        _this.panel.className = 'panel';\n        element.appendChild(_this.panel);\n        LayerSwitcher.enableTouchScroll_(_this.panel);\n\n        var this_ = _this;\n\n        button.onmouseover = function (e) {\n            this_.showPanel();\n        };\n\n        button.onclick = function (e) {\n            e = e || window.event;\n            this_.showPanel();\n            e.preventDefault();\n        };\n\n        this_.panel.onmouseout = function (e) {\n            e = e || window.event;\n            if (!this_.panel.contains(e.toElement || e.relatedTarget)) {\n                this_.hidePanel();\n            }\n        };\n\n        return _this;\n    }\n\n    /**\n    * Set the map instance the control is associated with.\n    * @param {ol/Map~Map} map The map instance.\n    */\n\n\n    createClass(LayerSwitcher, [{\n        key: 'setMap',\n        value: function setMap(map) {\n            // Clean up listeners associated with the previous map\n            for (var i = 0, key; i < this.mapListeners.length; i++) {\n                ol_Observable.unByKey(this.mapListeners[i]);\n            }\n            this.mapListeners.length = 0;\n            // Wire up listeners etc. and store reference to new map\n            get(LayerSwitcher.prototype.__proto__ || Object.getPrototypeOf(LayerSwitcher.prototype), 'setMap', this).call(this, map);\n            if (map) {\n                var this_ = this;\n                this.mapListeners.push(map.on('pointerdown', function () {\n                    this_.hidePanel();\n                }));\n                this.renderPanel();\n            }\n        }\n\n        /**\n        * Show the layer panel.\n        */\n\n    }, {\n        key: 'showPanel',\n        value: function showPanel() {\n            if (!this.element.classList.contains(this.shownClassName)) {\n                this.element.classList.add(this.shownClassName);\n                this.renderPanel();\n            }\n        }\n\n        /**\n        * Hide the layer panel.\n        */\n\n    }, {\n        key: 'hidePanel',\n        value: function hidePanel() {\n            if (this.element.classList.contains(this.shownClassName)) {\n                this.element.classList.remove(this.shownClassName);\n            }\n        }\n\n        /**\n        * Re-draw the layer panel to represent the current state of the layers.\n        */\n\n    }, {\n        key: 'renderPanel',\n        value: function renderPanel() {\n            LayerSwitcher.renderPanel(this.getMap(), this.panel, {\n                groupSelectStyle: this.groupSelectStyle\n            });\n        }\n\n        /**\n        * **Static** Re-draw the layer panel to represent the current state of the layers.\n        * @param {ol/Map~Map} map The OpenLayers Map instance to render layers for\n        * @param {Element} panel The DOM Element into which the layer tree will be rendered\n        */\n\n    }], [{\n        key: 'renderPanel',\n        value: function renderPanel(map, panel, options) {\n\n            options = options || {};\n\n            LayerSwitcher.ensureTopVisibleBaseLayerShown_(map);\n\n            while (panel.firstChild) {\n                panel.removeChild(panel.firstChild);\n            }\n\n            // Reset indeterminate state for all layers and groups before\n            // applying based on groupSelectStyle\n            LayerSwitcher.forEachRecursive(map, function (l, idx, a) {\n                l.set('indeterminate', false);\n            });\n\n            if (options.groupSelectStyle === 'children' || options.groupSelectStyle === 'none') {\n                // Set visibile and indeterminate state of groups based on\n                // their children's visibility\n                LayerSwitcher.setGroupVisibility(map);\n            } else if (options.groupSelectStyle === 'group') {\n                // Set child indetermiate state based on their parent's visibility\n                LayerSwitcher.setChildVisibility(map);\n            }\n\n            var ul = document.createElement('ul');\n            panel.appendChild(ul);\n            // passing two map arguments instead of lyr as we're passing the map as the root of the layers tree\n            LayerSwitcher.renderLayers_(map, map, ul, options, function render(changedLyr) {\n                // console.log('render');\n                LayerSwitcher.renderPanel(map, panel, options);\n            });\n        }\n    }, {\n        key: 'isBaseGroup',\n        value: function isBaseGroup(lyr) {\n            var lyrs = lyr.getLayers ? lyr.getLayers().getArray() : [];\n            return lyrs.length && lyrs[0].get('type') === 'base';\n        }\n    }, {\n        key: 'setGroupVisibility',\n        value: function setGroupVisibility(map) {\n            // Get a list of groups, with the deepest first\n            var groups = LayerSwitcher.getGroupsAndLayers(map, function (l) {\n                return l.getLayers && !l.get('combine') && !LayerSwitcher.isBaseGroup(l);\n            }).reverse();\n            // console.log(groups.map(g => g.get('title')));\n            groups.forEach(function (group) {\n                // TODO Can we use getLayersArray, is it public in the esm build?\n                var descendantVisibility = group.getLayersArray().map(function (l) {\n                    var state = l.getVisible();\n                    // console.log('>', l.get('title'), state);\n                    return state;\n                });\n                // console.log(descendantVisibility);\n                if (descendantVisibility.every(function (v) {\n                    return v === true;\n                })) {\n                    group.setVisible(true);\n                    group.set('indeterminate', false);\n                } else if (descendantVisibility.every(function (v) {\n                    return v === false;\n                })) {\n                    group.setVisible(false);\n                    group.set('indeterminate', false);\n                } else {\n                    group.setVisible(true);\n                    group.set('indeterminate', true);\n                }\n            });\n        }\n    }, {\n        key: 'setChildVisibility',\n        value: function setChildVisibility(map) {\n            // console.log('setChildVisibility');\n            var groups = LayerSwitcher.getGroupsAndLayers(map, function (l) {\n                return l.getLayers && !l.get('combine') && !LayerSwitcher.isBaseGroup(l);\n            });\n            groups.forEach(function (group) {\n                // console.log(group.get('title'));\n                var groupVisible = group.getVisible();\n                var groupIndeterminate = group.get('indeterminate');\n                group.getLayers().getArray().forEach(function (l) {\n                    // console.log('>', l.get('title'));\n                    l.set('indeterminate', false);\n                    if ((!groupVisible || groupIndeterminate) && l.getVisible()) {\n                        l.set('indeterminate', true);\n                    }\n                });\n            });\n        }\n\n        /**\n        * **Static** Ensure only the top-most base layer is visible if more than one is visible.\n        * @param {ol/Map~Map} map The map instance.\n        * @private\n        */\n\n    }, {\n        key: 'ensureTopVisibleBaseLayerShown_',\n        value: function ensureTopVisibleBaseLayerShown_(map) {\n            var lastVisibleBaseLyr;\n            LayerSwitcher.forEachRecursive(map, function (l, idx, a) {\n                if (l.get('type') === 'base' && l.getVisible()) {\n                    lastVisibleBaseLyr = l;\n                }\n            });\n            if (lastVisibleBaseLyr) LayerSwitcher.setVisible_(map, lastVisibleBaseLyr, true);\n        }\n    }, {\n        key: 'getGroupsAndLayers',\n        value: function getGroupsAndLayers(lyr, filterFn) {\n            var layers = [];\n            filterFn = filterFn || function (l, idx, a) {\n                return true;\n            };\n            LayerSwitcher.forEachRecursive(lyr, function (l, idx, a) {\n                if (l.get('title')) {\n                    if (filterFn(l, idx, a)) {\n                        layers.push(l);\n                    }\n                }\n            });\n            return layers;\n        }\n\n        /**\n        * **Static** Toggle the visible state of a layer.\n        * Takes care of hiding other layers in the same exclusive group if the layer\n        * is toggle to visible.\n        * @private\n        * @param {ol/Map~Map} map The map instance.\n        * @param {ol/layer/Base~BaseLayer} The layer whose visibility will be toggled.\n        */\n\n    }, {\n        key: 'setVisible_',\n        value: function setVisible_(map, lyr, visible, groupSelectStyle) {\n            // console.log(lyr.get('title'), visible, groupSelectStyle);\n            lyr.setVisible(visible);\n            if (visible && lyr.get('type') === 'base') {\n                // Hide all other base layers regardless of grouping\n                LayerSwitcher.forEachRecursive(map, function (l, idx, a) {\n                    if (l != lyr && l.get('type') === 'base') {\n                        l.setVisible(false);\n                    }\n                });\n            }\n            if (lyr.getLayers && !lyr.get('combine') && groupSelectStyle === 'children') {\n                lyr.getLayers().forEach(function (l) {\n                    LayerSwitcher.setVisible_(map, l, lyr.getVisible(), groupSelectStyle);\n                });\n            }\n        }\n\n        /**\n        * **Static** Render all layers that are children of a group.\n        * @private\n        * @param {ol/Map~Map} map The map instance.\n        * @param {ol/layer/Base~BaseLayer} lyr Layer to be rendered (should have a title property).\n        * @param {Number} idx Position in parent group list.\n        */\n\n    }, {\n        key: 'renderLayer_',\n        value: function renderLayer_(map, lyr, idx, options, render) {\n\n            var li = document.createElement('li');\n\n            var lyrTitle = lyr.get('title');\n\n            var checkboxId = LayerSwitcher.uuid();\n\n            var label = document.createElement('label');\n\n            if (lyr.getLayers && !lyr.get('combine')) {\n\n                var isBaseGroup = LayerSwitcher.isBaseGroup(lyr);\n\n                li.classList.add('group');\n                if (isBaseGroup) {\n                    li.classList.add(CSS_PREFIX + 'base-group');\n                }\n\n                // Group folding\n                if (lyr.get('fold')) {\n                    li.classList.add(CSS_PREFIX + 'fold');\n                    li.classList.add(CSS_PREFIX + lyr.get('fold'));\n                    var btn = document.createElement('button');\n                    btn.onclick = function (e) {\n                        LayerSwitcher.toggleFold_(lyr, li);\n                    };\n                    li.appendChild(btn);\n                }\n\n                if (!isBaseGroup && options.groupSelectStyle != 'none') {\n                    var _input = document.createElement('input');\n                    _input.type = 'checkbox';\n                    _input.id = checkboxId;\n                    _input.checked = lyr.getVisible();\n                    _input.indeterminate = lyr.get('indeterminate');\n                    _input.onchange = function (e) {\n                        LayerSwitcher.setVisible_(map, lyr, e.target.checked, options.groupSelectStyle);\n                        render(lyr);\n                    };\n                    li.appendChild(_input);\n                    label.htmlFor = checkboxId;\n                }\n\n                label.innerHTML = lyrTitle;\n                li.appendChild(label);\n                var ul = document.createElement('ul');\n                li.appendChild(ul);\n\n                LayerSwitcher.renderLayers_(map, lyr, ul, options, render);\n            } else {\n\n                li.className = 'layer';\n                var input = document.createElement('input');\n                if (lyr.get('type') === 'base') {\n                    input.type = 'radio';\n                    input.name = 'base';\n                } else {\n                    input.type = 'checkbox';\n                }\n                input.id = checkboxId;\n                input.checked = lyr.get('visible');\n                input.indeterminate = lyr.get('indeterminate');\n                input.onchange = function (e) {\n                    LayerSwitcher.setVisible_(map, lyr, e.target.checked, options.groupSelectStyle);\n                    render(lyr);\n                };\n                li.appendChild(input);\n\n                label.htmlFor = checkboxId;\n                label.innerHTML = lyrTitle;\n\n                var rsl = map.getView().getResolution();\n                if (rsl > lyr.getMaxResolution() || rsl < lyr.getMinResolution()) {\n                    label.className += ' disabled';\n                }\n\n                li.appendChild(label);\n            }\n\n            return li;\n        }\n\n        /**\n        * **Static** Render all layers that are children of a group.\n        * @private\n        * @param {ol/Map~Map} map The map instance.\n        * @param {ol/layer/Group~LayerGroup} lyr Group layer whose children will be rendered.\n        * @param {Element} elm DOM element that children will be appended to.\n        */\n\n    }, {\n        key: 'renderLayers_',\n        value: function renderLayers_(map, lyr, elm, options, render) {\n            var lyrs = lyr.getLayers().getArray().slice().reverse();\n            for (var i = 0, l; i < lyrs.length; i++) {\n                l = lyrs[i];\n                if (l.get('title')) {\n                    elm.appendChild(LayerSwitcher.renderLayer_(map, l, i, options, render));\n                }\n            }\n        }\n\n        /**\n        * **Static** Call the supplied function for each layer in the passed layer group\n        * recursing nested groups.\n        * @param {ol/layer/Group~LayerGroup} lyr The layer group to start iterating from.\n        * @param {Function} fn Callback which will be called for each `ol/layer/Base~BaseLayer`\n        * found under `lyr`. The signature for `fn` is the same as `ol/Collection~Collection#forEach`\n        */\n\n    }, {\n        key: 'forEachRecursive',\n        value: function forEachRecursive(lyr, fn) {\n            lyr.getLayers().forEach(function (lyr, idx, a) {\n                fn(lyr, idx, a);\n                if (lyr.getLayers) {\n                    LayerSwitcher.forEachRecursive(lyr, fn);\n                }\n            });\n        }\n\n        /**\n        * **Static** Generate a UUID\n        * Adapted from http://stackoverflow.com/a/2117523/526860\n        * @returns {String} UUID\n        */\n\n    }, {\n        key: 'uuid',\n        value: function uuid() {\n            return 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function (c) {\n                var r = Math.random() * 16 | 0,\n                    v = c == 'x' ? r : r & 0x3 | 0x8;\n                return v.toString(16);\n            });\n        }\n\n        /**\n        * @private\n        * @desc Apply workaround to enable scrolling of overflowing content within an\n        * element. Adapted from https://gist.github.com/chrismbarr/4107472\n        */\n\n    }, {\n        key: 'enableTouchScroll_',\n        value: function enableTouchScroll_(elm) {\n            if (LayerSwitcher.isTouchDevice_()) {\n                var scrollStartPos = 0;\n                elm.addEventListener(\"touchstart\", function (event) {\n                    scrollStartPos = this.scrollTop + event.touches[0].pageY;\n                }, false);\n                elm.addEventListener(\"touchmove\", function (event) {\n                    this.scrollTop = scrollStartPos - event.touches[0].pageY;\n                }, false);\n            }\n        }\n\n        /**\n        * @private\n        * @desc Determine if the current browser supports touch events. Adapted from\n        * https://gist.github.com/chrismbarr/4107472\n        */\n\n    }, {\n        key: 'isTouchDevice_',\n        value: function isTouchDevice_() {\n            try {\n                document.createEvent(\"TouchEvent\");\n                return true;\n            } catch (e) {\n                return false;\n            }\n        }\n\n        /**\n        * Fold/unfold layer group\n        * @private\n        */\n\n    }, {\n        key: 'toggleFold_',\n        value: function toggleFold_(lyr, li) {\n            li.classList.remove(CSS_PREFIX + lyr.get('fold'));\n            lyr.set('fold', lyr.get('fold') === 'open' ? 'close' : 'open');\n            li.classList.add(CSS_PREFIX + lyr.get('fold'));\n        }\n    }]);\n    return LayerSwitcher;\n}(Control);\n\nif (window.ol && window.ol.control) {\n    window.ol.control.LayerSwitcher = LayerSwitcher;\n}\n\nreturn LayerSwitcher;\n\n})));\n","import 'ol/ol.css';\r\nimport 'ol-layerswitcher/src/ol-layerswitcher.css';\r\nimport Map from 'ol/Map.js';\r\nimport View from 'ol/View.js';\r\nimport WMTSCapabilities from 'ol/format/WMTSCapabilities.js';\r\nimport {DEVICE_PIXEL_RATIO} from 'ol/has.js';\r\nimport TileLayer from 'ol/layer/Tile.js';\r\nimport WMTS, {optionsFromCapabilities} from 'ol/source/WMTS.js';\r\nimport TileWMS from 'ol/source/TileWMS.js';\r\nimport {fromLonLat} from 'ol/proj';\r\n\r\nimport LayerSwitcher from 'ol-layerswitcher';\r\n\r\n/** var gipGraphUrl = 'http://lisigo2.nachrichten.at:8080/geoserver/tiger/wms';*/\r\nvar gipGraphUrl = 'https://www4.nachrichten.at/lisigo2/geoserver/tiger/wms'; \r\nvar capabilitiesUrl = 'https://maps.wien.gv.at/basemap/1.0.0/WMTSCapabilities.xml';\r\n\r\nvar cur_or_default_lat = 48.303154;\r\nvar cur_or_default_lon = 14.285218;\r\nvar cur_zoom_level = 10;\r\n\r\nvar homeCoords = [cur_or_default_lon, cur_or_default_lat]; // longitude first, then latitude\r\nvar homeMercator = fromLonLat(homeCoords);\r\n\r\nvar hiDPI = DEVICE_PIXEL_RATIO > 1;\r\nvar hidpiLayer = hiDPI ? 'bmaphidpi' : 'geolandbasemap';\r\nvar tilePixelRatio = hiDPI ? 2 : 1;\r\n\r\nvar gipGraphSource = new TileWMS({\r\n\turl: gipGraphUrl,\r\n\tparams: {\r\n\t\t'LAYERS': 'tiger:frc05',\r\n\t\t'TILED': true,\r\n\t\t'isBaseLayer': false\r\n\t},\r\n\tserverType: 'geoserver'\r\n});\r\n\r\n\r\n\r\nconst map = new Map({\r\n\tlayers: [],\r\n\ttarget: 'map',\r\n\tview: new View({\r\n\t\tcenter:  homeMercator,\r\n\t\tzoom: cur_zoom_level\r\n\t})\r\n});\r\nvar layerSwitcher = new LayerSwitcher();\r\nmap.addControl(layerSwitcher);\r\n\r\nfetch(capabilitiesUrl).then(function(response) {\r\n\treturn response.text();\r\n}).then(function(text) {\r\n\tvar result = new WMTSCapabilities().read(text);\r\n\tvar options = optionsFromCapabilities(result, {\r\n\t  layer: hidpiLayer,\r\n\t  matrixSet: 'google3857',\r\n\t  style: 'normal'\r\n\t});\r\n\toptions.tilePixelRatio = tilePixelRatio;\r\n\tmap.addLayer(new TileLayer({\r\n\t\ttitle: 'Basemap',\r\n\t\tsource: new WMTS(/** @type {!module:ol/source/WMTS~Options} */ (options))\r\n\t}));\r\n\tmap.addLayer(new TileLayer({\r\n\t\ttitle: 'Verkehrslage',\r\n\t\tsource: gipGraphSource\r\n\t}));\r\n});"]}