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KmlTour.js
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KmlTour.js
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import defined from "../Core/defined.js";
import Event from "../Core/Event.js";
/**
* Describes a KmlTour, which uses KmlTourFlyTo, and KmlTourWait to
* guide the camera to a specified destinations on given time intervals.
*
* @alias KmlTour
* @constructor
*
* @param {String} name name parsed from KML
* @param {String} id id parsed from KML
* @param {Array} playlist array with KmlTourFlyTos and KmlTourWaits
*
* @see KmlTourFlyTo
* @see KmlTourWait
*
* @demo {@link https://sandcastle.cesium.com/?src=KML%20Tours.html|KML Tours}
*/
function KmlTour(name, id) {
/**
* Id of kml gx:Tour entry
* @type String
*/
this.id = id;
/**
* Tour name
* @type String
*/
this.name = name;
/**
* Index of current entry from playlist
* @type Number
*/
this.playlistIndex = 0;
/**
* Array of playlist entries
* @type Array
*/
this.playlist = [];
/**
* Event will be called when tour starts to play,
* before any playlist entry starts to play.
* @type Event
*/
this.tourStart = new Event();
/**
* Event will be called when all playlist entries are
* played, or tour playback being canceled.
*
* If tour playback was terminated, event callback will
* be called with terminated=true parameter.
* @type Event
*/
this.tourEnd = new Event();
/**
* Event will be called when entry from playlist starts to play.
*
* Event callback will be called with curent entry as first parameter.
* @type Event
*/
this.entryStart = new Event();
/**
* Event will be called when entry from playlist ends to play.
*
* Event callback will be called with following parameters:
* 1. entry - entry
* 2. terminated - true if playback was terminated by calling {@link KmlTour#stop}
* @type Event
*/
this.entryEnd = new Event();
this._activeEntries = [];
}
/**
* Add entry to this tour playlist.
*
* @param {KmlTourFlyTo|KmlTourWait} entry an entry to add to the playlist.
*/
KmlTour.prototype.addPlaylistEntry = function (entry) {
this.playlist.push(entry);
};
/**
* Play this tour.
*
* @param {Viewer} viewer viewer widget.
* @param {Object} [cameraOptions] these options will be merged with {@link Camera#flyTo}
* options for FlyTo playlist entries.
*/
KmlTour.prototype.play = function (viewer, cameraOptions) {
this.tourStart.raiseEvent();
const tour = this;
playEntry.call(this, viewer, cameraOptions, function (terminated) {
tour.playlistIndex = 0;
// Stop nonblocking entries
if (!terminated) {
cancelAllEntries(tour._activeEntries);
}
tour.tourEnd.raiseEvent(terminated);
});
};
/**
* Stop curently playing tour.
*/
KmlTour.prototype.stop = function () {
cancelAllEntries(this._activeEntries);
};
// Stop all activeEntries.
function cancelAllEntries(activeEntries) {
for (
let entry = activeEntries.pop();
entry !== undefined;
entry = activeEntries.pop()
) {
entry.stop();
}
}
// Play playlist entry.
// This function is called recursevly with playNext and iterates over all entries from playlist.
function playEntry(viewer, cameraOptions, allDone) {
const entry = this.playlist[this.playlistIndex];
if (entry) {
const _playNext = playNext.bind(this, viewer, cameraOptions, allDone);
this._activeEntries.push(entry);
this.entryStart.raiseEvent(entry);
if (entry.blocking) {
entry.play(_playNext, viewer.scene.camera, cameraOptions);
} else {
const tour = this;
entry.play(function () {
tour.entryEnd.raiseEvent(entry);
const indx = tour._activeEntries.indexOf(entry);
if (indx >= 0) {
tour._activeEntries.splice(indx, 1);
}
});
_playNext(viewer, cameraOptions, allDone);
}
} else if (defined(allDone)) {
allDone(false);
}
}
// Increment playlistIndex and call playEntry if terminated isn't true.
function playNext(viewer, cameraOptions, allDone, terminated) {
const entry = this.playlist[this.playlistIndex];
this.entryEnd.raiseEvent(entry, terminated);
if (terminated) {
allDone(terminated);
} else {
const indx = this._activeEntries.indexOf(entry);
if (indx >= 0) {
this._activeEntries.splice(indx, 1);
}
this.playlistIndex++;
playEntry.call(this, viewer, cameraOptions, allDone);
}
}
export default KmlTour;