388 lines
12 KiB
HTML
388 lines
12 KiB
HTML
<!DOCTYPE html>
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<html lang="en">
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<head>
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<meta charset="utf-8">
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<meta http-equiv="X-UA-Compatible" content="IE=edge">
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<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1, minimum-scale=1, user-scalable=no">
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<meta name="description" content="A custom DataSource implementation.">
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<meta name="cesium-sandcastle-labels" content="Showcases, DataSources, Tutorials">
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<title>Cesium Demo</title>
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<script type="text/javascript" src="../Sandcastle-header.js"></script>
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<script type="text/javascript" src="../../../ThirdParty/requirejs-2.1.20/require.js"></script>
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<script type="text/javascript">
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require.config({
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baseUrl : '../../../Source',
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waitSeconds : 60
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});
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</script>
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</head>
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<body class="sandcastle-loading" data-sandcastle-bucket="bucket-requirejs.html">
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<style>
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@import url(../templates/bucket.css);
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</style>
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<div id="cesiumContainer" class="fullSize"></div>
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<div id="loadingOverlay"><h1>Loading...</h1></div>
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<div id="toolbar"></div>
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<script id="cesium_sandcastle_script">
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function startup(Cesium) {
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'use strict';
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//Sandcastle_Begin
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/**
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* This class is an example of a custom DataSource. It loads JSON data as
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* defined by Google's WebGL Globe, https://github.com/dataarts/webgl-globe.
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* @alias WebGLGlobeDataSource
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* @constructor
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*
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* @param {String} [name] The name of this data source. If undefined, a name
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* will be derived from the url.
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*
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* @example
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* var dataSource = new Cesium.WebGLGlobeDataSource();
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* dataSource.loadUrl('sample.json');
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* viewer.dataSources.add(dataSource);
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*/
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function WebGLGlobeDataSource(name) {
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//All public configuration is defined as ES5 properties
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//These are just the "private" variables and their defaults.
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this._name = name;
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this._changed = new Cesium.Event();
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this._error = new Cesium.Event();
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this._isLoading = false;
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this._loading = new Cesium.Event();
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this._entityCollection = new Cesium.EntityCollection();
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this._seriesNames = [];
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this._seriesToDisplay = undefined;
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this._heightScale = 10000000;
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this._entityCluster = new Cesium.EntityCluster();
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}
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Object.defineProperties(WebGLGlobeDataSource.prototype, {
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//The below properties must be implemented by all DataSource instances
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/**
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* Gets a human-readable name for this instance.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {String}
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*/
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name : {
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get : function() {
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return this._name;
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}
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},
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/**
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* Since WebGL Globe JSON is not time-dynamic, this property is always undefined.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {DataSourceClock}
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*/
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clock : {
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value : undefined,
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writable : false
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},
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/**
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* Gets the collection of Entity instances.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {EntityCollection}
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*/
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entities : {
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get : function() {
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return this._entityCollection;
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}
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},
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/**
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* Gets a value indicating if the data source is currently loading data.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {Boolean}
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*/
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isLoading : {
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get : function() {
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return this._isLoading;
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}
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},
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/**
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* Gets an event that will be raised when the underlying data changes.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {Event}
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*/
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changedEvent : {
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get : function() {
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return this._changed;
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}
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},
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/**
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* Gets an event that will be raised if an error is encountered during
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* processing.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {Event}
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*/
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errorEvent : {
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get : function() {
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return this._error;
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}
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},
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/**
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* Gets an event that will be raised when the data source either starts or
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* stops loading.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {Event}
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*/
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loadingEvent : {
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get : function() {
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return this._loading;
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}
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},
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//These properties are specific to this DataSource.
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/**
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* Gets the array of series names.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {String[]}
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*/
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seriesNames : {
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get : function() {
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return this._seriesNames;
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}
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},
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/**
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* Gets or sets the name of the series to display. WebGL JSON is designed
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* so that only one series is viewed at a time. Valid values are defined
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* in the seriesNames property.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {String}
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*/
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seriesToDisplay : {
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get : function() {
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return this._seriesToDisplay;
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},
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set : function(value) {
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this._seriesToDisplay = value;
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//Iterate over all entities and set their show property
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//to true only if they are part of the current series.
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var collection = this._entityCollection;
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var entities = collection.values;
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collection.suspendEvents();
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for (var i = 0; i < entities.length; i++) {
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var entity = entities[i];
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entity.show = value === entity.seriesName;
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}
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collection.resumeEvents();
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}
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},
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/**
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* Gets or sets the scale factor applied to the height of each line.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {Number}
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*/
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heightScale : {
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get : function() {
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return this._heightScale;
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},
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set : function(value) {
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if (value > 0) {
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throw new Cesium.DeveloperError('value must be greater than 0');
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}
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this._heightScale = value;
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}
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},
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/**
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* Gets whether or not this data source should be displayed.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {Boolean}
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*/
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show : {
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get : function() {
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return this._entityCollection;
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},
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set : function(value) {
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this._entityCollection = value;
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}
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},
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/**
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* Gets or sets the clustering options for this data source. This object can be shared between multiple data sources.
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* @memberof WebGLGlobeDataSource.prototype
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* @type {EntityCluster}
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*/
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clustering : {
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get : function() {
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return this._entityCluster;
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},
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set : function(value) {
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if (!Cesium.defined(value)) {
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throw new Cesium.DeveloperError('value must be defined.');
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}
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this._entityCluster = value;
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}
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}
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});
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/**
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* Asynchronously loads the GeoJSON at the provided url, replacing any existing data.
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* @param {Object} url The url to be processed.
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* @returns {Promise} a promise that will resolve when the GeoJSON is loaded.
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*/
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WebGLGlobeDataSource.prototype.loadUrl = function(url) {
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if (!Cesium.defined(url)) {
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throw new Cesium.DeveloperError('url is required.');
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}
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//Create a name based on the url
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var name = Cesium.getFilenameFromUri(url);
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//Set the name if it is different than the current name.
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if (this._name !== name) {
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this._name = name;
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this._changed.raiseEvent(this);
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}
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//Use 'when' to load the URL into a json object
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//and then process is with the `load` function.
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var that = this;
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return Cesium.Resource.fetchJson(url).then(function(json) {
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return that.load(json, url);
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}).otherwise(function(error) {
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//Otherwise will catch any errors or exceptions that occur
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//during the promise processing. When this happens,
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//we raise the error event and reject the promise.
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this._setLoading(false);
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that._error.raiseEvent(that, error);
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return Cesium.when.reject(error);
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});
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};
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/**
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* Loads the provided data, replacing any existing data.
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* @param {Array} data The object to be processed.
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*/
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WebGLGlobeDataSource.prototype.load = function(data) {
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//>>includeStart('debug', pragmas.debug);
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if (!Cesium.defined(data)) {
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throw new Cesium.DeveloperError('data is required.');
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}
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//>>includeEnd('debug');
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//Clear out any data that might already exist.
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this._setLoading(true);
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this._seriesNames.length = 0;
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this._seriesToDisplay = undefined;
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var heightScale = this.heightScale;
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var entities = this._entityCollection;
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//It's a good idea to suspend events when making changes to a
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//large amount of entities. This will cause events to be batched up
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//into the minimal amount of function calls and all take place at the
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//end of processing (when resumeEvents is called).
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entities.suspendEvents();
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entities.removeAll();
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//WebGL Globe JSON is an array of series, where each series itself is an
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//array of two items, the first containing the series name and the second
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//being an array of repeating latitude, longitude, height values.
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//
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//Here's a more visual example.
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//[["series1",[latitude, longitude, height, ... ]
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// ["series2",[latitude, longitude, height, ... ]]
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// Loop over each series
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for (var x = 0; x < data.length; x++) {
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var series = data[x];
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var seriesName = series[0];
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var coordinates = series[1];
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//Add the name of the series to our list of possible values.
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this._seriesNames.push(seriesName);
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//Make the first series the visible one by default
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var show = x === 0;
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if (show) {
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this._seriesToDisplay = seriesName;
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}
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//Now loop over each coordinate in the series and create
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// our entities from the data.
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for (var i = 0; i < coordinates.length; i += 3) {
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var latitude = coordinates[i];
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var longitude = coordinates[i + 1];
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var height = coordinates[i + 2];
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//Ignore lines of zero height.
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if(height === 0) {
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continue;
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}
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var color = Cesium.Color.fromHsl((0.6 - (height * 0.5)), 1.0, 0.5);
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var surfacePosition = Cesium.Cartesian3.fromDegrees(longitude, latitude, 0);
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var heightPosition = Cesium.Cartesian3.fromDegrees(longitude, latitude, height * heightScale);
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//WebGL Globe only contains lines, so that's the only graphics we create.
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var polyline = new Cesium.PolylineGraphics();
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polyline.material = new Cesium.ColorMaterialProperty(color);
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polyline.width = new Cesium.ConstantProperty(2);
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polyline.arcType = new Cesium.ConstantProperty(Cesium.ArcType.NONE);
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polyline.positions = new Cesium.ConstantProperty([surfacePosition, heightPosition]);
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//The polyline instance itself needs to be on an entity.
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var entity = new Cesium.Entity({
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id : seriesName + ' index ' + i.toString(),
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show : show,
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polyline : polyline,
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seriesName : seriesName //Custom property to indicate series name
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});
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//Add the entity to the collection.
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entities.add(entity);
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}
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}
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//Once all data is processed, call resumeEvents and raise the changed event.
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entities.resumeEvents();
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this._changed.raiseEvent(this);
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this._setLoading(false);
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};
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WebGLGlobeDataSource.prototype._setLoading = function(isLoading) {
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if (this._isLoading !== isLoading) {
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this._isLoading = isLoading;
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this._loading.raiseEvent(this, isLoading);
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}
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};
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//Now that we've defined our own DataSource, we can use it to load
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//any JSON data formatted for WebGL Globe.
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var dataSource = new WebGLGlobeDataSource();
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dataSource.loadUrl('../../SampleData/population909500.json').then(function() {
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//After the initial load, create buttons to let the user switch among series.
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function createSeriesSetter(seriesName) {
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return function() {
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dataSource.seriesToDisplay = seriesName;
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};
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}
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for (var i = 0; i < dataSource.seriesNames.length; i++) {
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var seriesName = dataSource.seriesNames[i];
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Sandcastle.addToolbarButton(seriesName, createSeriesSetter(seriesName));
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}
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});
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//Create a Viewer instances and add the DataSource.
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var viewer = new Cesium.Viewer('cesiumContainer', {
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animation : false,
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timeline : false
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});
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viewer.clock.shouldAnimate = false;
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viewer.dataSources.add(dataSource);
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//Sandcastle_End
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Sandcastle.finishedLoading();
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}
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if (typeof Cesium !== 'undefined') {
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startup(Cesium);
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} else if (typeof require === 'function') {
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require(['Cesium'], startup);
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}
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</script>
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</body>
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</html>
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