mirror of
https://github.com/jiawanlong/Cesium-Examples.git
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793 lines
25 KiB
JavaScript
793 lines
25 KiB
JavaScript
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/**
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* @requires SuperMap/Layer/SphericalMercator.js
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* @requires SuperMap/Layer/EventPane.js
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* @requires SuperMap/Layer/FixedZoomLevels.js
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* @requires SuperMap/Lang.js
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*/
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/**
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* Class: SuperMap.Layer.Google
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* Google图层类
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*
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* Inherits from:
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* - <SuperMap.Layer.SphericalMercator>
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* - <SuperMap.Layer.EventPane>
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* - <SuperMap.Layer.FixedZoomLevels>
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*/
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SuperMap.Layer.Google = SuperMap.Class(
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SuperMap.Layer.EventPane,
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SuperMap.Layer.FixedZoomLevels, {
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/**
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* Constant: MIN_ZOOM_LEVEL
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* {Integer} 最小缩放等级，为0。
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*/
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MIN_ZOOM_LEVEL: 0,
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/**
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* Constant: MAX_ZOOM_LEVEL
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* {Integer} 最大缩放等级，为21。
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*/
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MAX_ZOOM_LEVEL: 21,
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/**
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* Constant: RESOLUTIONS
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* {Array(Float)} 分辨率数组。
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* 分辨率数组值为固定值，这样会更接近wms的标准投影。
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*/
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RESOLUTIONS: [
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1.40625,
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0.703125,
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0.3515625,
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0.17578125,
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0.087890625,
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0.0439453125,
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0.02197265625,
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0.010986328125,
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0.0054931640625,
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0.00274658203125,
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0.001373291015625,
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0.0006866455078125,
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0.00034332275390625,
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0.000171661376953125,
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0.0000858306884765625,
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0.00004291534423828125,
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0.00002145767211914062,
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0.00001072883605957031,
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0.00000536441802978515,
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0.00000268220901489257,
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0.0000013411045074462891,
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0.00000067055225372314453
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],
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/**
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* APIProperty: type
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* {GMapType} 指定需要获取的图层类型，默认值为unll，表示图层为“G_STREETS_MAP”。
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* Google服务提供的图层类型有：PHYSICAL、HYBRID、SATELLITE、STREETS。
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*/
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type: null,
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/**
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* APIProperty: wrapDateLine
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* {Boolean} 允许水平方向调整。默认为true。
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* 当<sphericalMercator>为true时，设置此项为false可以限制水平方向调整。
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*/
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wrapDateLine: true,
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/**
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* APIProperty: sphericalMercator
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* {Boolean} 是否使用墨卡托投影，默认值为false。
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* 如果使用墨卡托投影，将会导致所有与地图的互动实际上是与地图投影的互动，其支持矢量绘图，地图叠加等。
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*/
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sphericalMercator: false,
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/**
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* Property: version
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* {Number} The version of the Google Maps API
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*/
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version: null,
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/**
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* Constructor: SuperMap.Layer.Google
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* Google图层构造函数
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*
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* Example：
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* (code)
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*
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* var googlelayer = new SuperMap.Layer.Google( "Google Physical",
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* {type: google.maps.MapTypeId.TERRAIN});
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*
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* (end)
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*
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* Parameters:
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* name - {String} 图层名称.
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* options - {Object} 一个options对象，该对象上的属性将会被设置到图层上。
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*/
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initialize: function(name, options) {
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options = options || {};
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if(!options.version) {
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options.version = typeof GMap2 === "function" ? "2" : "3";
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}
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var mixin = SuperMap.Layer.Google["v" +
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options.version.replace(/\./g, "_")];
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if (mixin) {
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SuperMap.Util.applyDefaults(options, mixin);
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} else {
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throw "Unsupported Google Maps API version: " + options.version;
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}
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SuperMap.Util.applyDefaults(options, mixin.DEFAULTS);
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if (options.maxExtent) {
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options.maxExtent = options.maxExtent.clone();
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}
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SuperMap.Layer.EventPane.prototype.initialize.apply(this,
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[name, options]);
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SuperMap.Layer.FixedZoomLevels.prototype.initialize.apply(this,
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[name, options]);
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if (this.sphericalMercator) {
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SuperMap.Util.extend(this, SuperMap.Layer.SphericalMercator);
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this.initMercatorParameters();
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}
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},
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/**
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* Method: clone
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* 创建一个该图层的副本
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*
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* Returns:
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* {<SuperMap.Layer.Google>} An exact clone of this layer
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*/
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clone: function() {
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/**
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* This method isn't intended to be called by a subclass and it
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* doesn't call the same method on the superclass. We don't call
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* the super's clone because we don't want properties that are set
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* on this layer after initialize (i.e. this.mapObject etc.).
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*/
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return new SuperMap.Layer.Google(
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this.name, this.getOptions()
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);
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},
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/**
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* APIMethod: setVisibility
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* 为图层设置可见性标记、相应的显示/隐藏及重绘。触发事件除非其他规定。
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*
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* 注意此visibility不再简单的是否为图层的style。display被设置为“block”。现在我们在图层类上存储一个‘visibility’状态属性，
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* 这样可以使我们记录是否要求一个图层存在可见性属性。当地图的分辨率在图层的范围之外的状况下，这个属性可能会被推翻。
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*
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* Parameters:
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* visible - {Boolean} 显示图层 (在范围内)
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*/
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setVisibility: function(visible) {
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// sharing a map container, opacity has to be set per layer
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var opacity = this.opacity == null ? 1 : this.opacity;
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SuperMap.Layer.EventPane.prototype.setVisibility.apply(this, arguments);
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this.setOpacity(opacity);
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},
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/**
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* APIMethod: display
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* 显示或隐藏图层
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*
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* Parameters:
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* display - {Boolean}
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*/
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display: function(visible) {
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if (!this._dragging) {
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this.setGMapVisibility(visible);
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}
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SuperMap.Layer.EventPane.prototype.display.apply(this, arguments);
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},
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/**
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* Method: moveTo
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* 移动
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* Parameters:
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* bound - {<SuperMap.Bounds>}
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* zoomChanged - {Boolean} 说明何时zoom开始变化，当图层必须做一些初始化工作的时候。
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* dragging - {Boolean}
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*/
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moveTo: function(bounds, zoomChanged, dragging) {
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this._dragging = dragging;
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SuperMap.Layer.EventPane.prototype.moveTo.apply(this, arguments);
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delete this._dragging;
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},
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/**
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* APIMethod: setOpacity
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* 为全部图层设置不透明度。
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*
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* Parameter:
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* opacity - {Float}
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*/
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setOpacity: function(opacity) {
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if (opacity !== this.opacity) {
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if (this.map != null) {
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this.map.events.triggerEvent("changelayer", {
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layer: this,
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property: "opacity"
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});
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}
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this.opacity = opacity;
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}
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// Though this layer's opacity may not change, we're sharing a container
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// and need to update the opacity for the entire container.
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if (this.getVisibility()) {
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var container = this.getMapContainer();
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SuperMap.Util.modifyDOMElement(
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container, null, null, null, null, null, null, opacity
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);
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}
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},
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/**
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* APIMethod: destroy
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* 清理此图层.
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*/
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destroy: function() {
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/**
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* We have to override this method because the event pane destroy
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* deletes the mapObject reference before removing this layer from
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* the map.
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*/
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if (this.map) {
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this.setGMapVisibility(false);
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var cache = SuperMap.Layer.Google.cache[this.map.id];
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if (cache && cache.count <= 1) {
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this.removeGMapElements();
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}
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}
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SuperMap.Layer.EventPane.prototype.destroy.apply(this, arguments);
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},
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/**
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* Method: removeGMapElements
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* Remove all elements added to the dom. This should only be called if
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* this is the last of the Google layers for the given map.
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*/
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removeGMapElements: function() {
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var cache = SuperMap.Layer.Google.cache[this.map.id];
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if (cache) {
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// remove shared elements from dom
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var container = this.mapObject && this.getMapContainer();
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if (container && container.parentNode) {
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container.parentNode.removeChild(container);
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}
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var termsOfUse = cache.termsOfUse;
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if (termsOfUse && termsOfUse.parentNode) {
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termsOfUse.parentNode.removeChild(termsOfUse);
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}
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var poweredBy = cache.poweredBy;
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if (poweredBy && poweredBy.parentNode) {
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poweredBy.parentNode.removeChild(poweredBy);
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}
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}
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},
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/**
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* APIMethod: removeMap
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* On being removed from the map, also remove termsOfUse and poweredBy divs
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*
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* Parameters:
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* map - {<SuperMap.Map>}
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*/
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removeMap: function(map) {
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// hide layer before removing
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if (this.visibility && this.mapObject) {
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this.setGMapVisibility(false);
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}
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// check to see if last Google layer in this map
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var cache = SuperMap.Layer.Google.cache[map.id];
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if (cache) {
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if (cache.count <= 1) {
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this.removeGMapElements();
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delete SuperMap.Layer.Google.cache[map.id];
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} else {
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// decrement the layer count
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--cache.count;
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}
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}
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// remove references to gmap elements
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delete this.termsOfUse;
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delete this.poweredBy;
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delete this.mapObject;
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delete this.dragObject;
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SuperMap.Layer.EventPane.prototype.removeMap.apply(this, arguments);
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},
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//
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// TRANSLATION: MapObject Bounds <-> SuperMap.Bounds
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//
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/**
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* APIMethod: getOLBoundsFromMapObjectBounds
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*
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* Parameters:
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* moBounds - {Object}
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*
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* Returns:
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* {<SuperMap.Bounds>} An <SuperMap.Bounds>, translated from the
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* passed-in MapObject Bounds.
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* Returns null if null value is passed in.
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*/
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getOLBoundsFromMapObjectBounds: function(moBounds) {
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var olBounds = null;
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if (moBounds != null) {
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var sw = moBounds.getSouthWest();
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var ne = moBounds.getNorthEast();
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if (this.sphericalMercator) {
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sw = this.forwardMercator(sw.lng(), sw.lat());
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ne = this.forwardMercator(ne.lng(), ne.lat());
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} else {
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sw = new SuperMap.LonLat(sw.lng(), sw.lat());
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ne = new SuperMap.LonLat(ne.lng(), ne.lat());
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}
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olBounds = new SuperMap.Bounds(sw.lon,
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sw.lat,
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ne.lon,
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ne.lat );
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}
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return olBounds;
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},
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/**
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* APIMethod: getWarningHTML
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*
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* Returns:
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* {String} String with information on why layer is broken, how to get
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* it working.
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*/
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getWarningHTML:function() {
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return SuperMap.i18n("googleWarning");
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},
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/************************************
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* *
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* MapObject Interface Controls *
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* *
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************************************/
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// Get&Set Center, Zoom
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/**
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* APIMethod: getMapObjectCenter
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*
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* Returns:
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* {Object} The mapObject's current center in Map Object format
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*/
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getMapObjectCenter: function() {
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return this.mapObject.getCenter();
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},
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/**
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* APIMethod: getMapObjectZoom
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*
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* Returns:
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* {Integer} The mapObject's current zoom, in Map Object format
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*/
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getMapObjectZoom: function() {
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return this.mapObject.getZoom();
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},
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/************************************
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* *
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* MapObject Primitives *
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* *
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************************************/
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// LonLat
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/**
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* APIMethod: getLongitudeFromMapObjectLonLat
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*
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* Parameters:
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* moLonLat - {Object} MapObject LonLat format
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*
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* Returns:
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* {Float} Longitude of the given MapObject LonLat
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*/
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getLongitudeFromMapObjectLonLat: function(moLonLat) {
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return this.sphericalMercator ?
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this.forwardMercator(moLonLat.lng(), moLonLat.lat()).lon :
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moLonLat.lng();
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},
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/**
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* APIMethod: getLatitudeFromMapObjectLonLat
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*
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* Parameters:
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* moLonLat - {Object} MapObject LonLat format
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*
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* Returns:
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* {Float} Latitude of the given MapObject LonLat
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*/
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getLatitudeFromMapObjectLonLat: function(moLonLat) {
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var lat = this.sphericalMercator ?
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this.forwardMercator(moLonLat.lng(), moLonLat.lat()).lat :
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moLonLat.lat();
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return lat;
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},
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// Pixel
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/**
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* APIMethod: getXFromMapObjectPixel
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*
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* Parameters:
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* moPixel - {Object} MapObject Pixel format
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*
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* Returns:
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* {Integer} X value of the MapObject Pixel
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*/
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getXFromMapObjectPixel: function(moPixel) {
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return moPixel.x;
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},
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/**
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* APIMethod: getYFromMapObjectPixel
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*
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* Parameters:
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* moPixel - {Object} MapObject Pixel format
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*
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* Returns:
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* {Integer} Y value of the MapObject Pixel
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*/
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getYFromMapObjectPixel: function(moPixel) {
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return moPixel.y;
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},
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CLASS_NAME: "SuperMap.Layer.Google"
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});
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/**
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* Property: SuperMap.Layer.Google.cache
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* {Object} Cache for elements that should only be created once per map.
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*/
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SuperMap.Layer.Google.cache = {};
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/**
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* Constant: SuperMap.Layer.Google.v2
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*
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* Mixin providing functionality specific to the Google Maps API v2.
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*/
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SuperMap.Layer.Google.v2 = {
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/**
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* Property: termsOfUse
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* {DOMElement} Div for Google's copyright and terms of use link
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*/
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termsOfUse: null,
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/**
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* Property: poweredBy
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* {DOMElement} Div for Google's powered by logo and link
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*/
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poweredBy: null,
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/**
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* Property: dragObject
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* {GDraggableObject} Since 2.93, Google has exposed the ability to get
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* the maps GDraggableObject. We can now use this for smooth panning
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*/
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dragObject: null,
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/**
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* Method: loadMapObject
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* Load the GMap and register appropriate event listeners. If we can't
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* load GMap2, then display a warning message.
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*/
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loadMapObject:function() {
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if (!this.type) {
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this.type = G_NORMAL_MAP;
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}
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var mapObject, termsOfUse, poweredBy;
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var cache = SuperMap.Layer.Google.cache[this.map.id];
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if (cache) {
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// there are already Google layers added to this map
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mapObject = cache.mapObject;
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termsOfUse = cache.termsOfUse;
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poweredBy = cache.poweredBy;
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// increment the layer count
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++cache.count;
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} else {
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// this is the first Google layer for this map
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var container = this.map.viewPortDiv;
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var div = document.createElement("div");
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div.id = this.map.id + "_GMap2Container";
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div.style.position = "absolute";
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div.style.width = "100%";
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div.style.height = "100%";
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container.appendChild(div);
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// create GMap and shuffle elements
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try {
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mapObject = new GMap2(div);
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// move the ToS and branding stuff up to the container div
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termsOfUse = div.lastChild;
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container.appendChild(termsOfUse);
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termsOfUse.style.zIndex = "1100";
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termsOfUse.style.right = "";
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termsOfUse.style.bottom = "";
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termsOfUse.className = "olLayerGoogleCopyright";
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poweredBy = div.lastChild;
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container.appendChild(poweredBy);
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poweredBy.style.zIndex = "1100";
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poweredBy.style.right = "";
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poweredBy.style.bottom = "";
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poweredBy.className = "olLayerGooglePoweredBy gmnoprint";
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} catch (e) {
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throw(e);
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}
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// cache elements for use by any other google layers added to
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// this same map
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SuperMap.Layer.Google.cache[this.map.id] = {
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mapObject: mapObject,
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termsOfUse: termsOfUse,
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poweredBy: poweredBy,
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count: 1
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};
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}
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this.mapObject = mapObject;
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this.termsOfUse = termsOfUse;
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||
this.poweredBy = poweredBy;
|
||
|
||
// ensure this layer type is one of the mapObject types
|
||
if (SuperMap.Util.indexOf(this.mapObject.getMapTypes(),
|
||
this.type) === -1) {
|
||
this.mapObject.addMapType(this.type);
|
||
}
|
||
|
||
//since v 2.93 getDragObject is now available.
|
||
if(typeof mapObject.getDragObject == "function") {
|
||
this.dragObject = mapObject.getDragObject();
|
||
} else {
|
||
this.dragPanMapObject = null;
|
||
}
|
||
|
||
if(this.isBaseLayer === false) {
|
||
this.setGMapVisibility(this.div.style.display !== "none");
|
||
}
|
||
|
||
},
|
||
|
||
/**
|
||
* APIMethod: onMapResize
|
||
*/
|
||
onMapResize: function() {
|
||
// workaround for resizing of invisible or not yet fully loaded layers
|
||
// where GMap2.checkResize() does not work. We need to load the GMap
|
||
// for the old div size, then checkResize(), and then call
|
||
// layer.moveTo() to trigger GMap.setCenter() (which will finish
|
||
// the GMap initialization).
|
||
if(this.visibility && this.mapObject.isLoaded()) {
|
||
this.mapObject.checkResize();
|
||
} else {
|
||
if(!this._resized) {
|
||
var layer = this;
|
||
var handle = GEvent.addListener(this.mapObject, "load", function() {
|
||
GEvent.removeListener(handle);
|
||
delete layer._resized;
|
||
layer.mapObject.checkResize();
|
||
layer.moveTo(layer.map.getCenter(), layer.map.getZoom());
|
||
});
|
||
}
|
||
this._resized = true;
|
||
}
|
||
},
|
||
|
||
/**
|
||
* Method: setGMapVisibility
|
||
* Display the GMap container and associated elements.
|
||
*
|
||
* Parameters:
|
||
* visible - {Boolean} Display the GMap elements.
|
||
*/
|
||
setGMapVisibility: function(visible) {
|
||
var cache = SuperMap.Layer.Google.cache[this.map.id];
|
||
if (cache) {
|
||
var container = this.mapObject.getContainer();
|
||
if (visible === true) {
|
||
this.mapObject.setMapType(this.type);
|
||
container.style.display = "";
|
||
this.termsOfUse.style.left = "";
|
||
this.termsOfUse.style.display = "";
|
||
this.poweredBy.style.display = "";
|
||
cache.displayed = this.id;
|
||
} else {
|
||
if (cache.displayed === this.id) {
|
||
delete cache.displayed;
|
||
}
|
||
if (!cache.displayed) {
|
||
container.style.display = "none";
|
||
this.termsOfUse.style.display = "none";
|
||
// move ToU far to the left in addition to setting display
|
||
// to "none", because at the end of the GMap2 load
|
||
// sequence, display: none will be unset and ToU would be
|
||
// visible after loading a map with a google layer that is
|
||
// initially hidden.
|
||
this.termsOfUse.style.left = "-9999px";
|
||
this.poweredBy.style.display = "none";
|
||
}
|
||
}
|
||
}
|
||
},
|
||
|
||
/**
|
||
* Method: getMapContainer
|
||
*
|
||
* Returns:
|
||
* {DOMElement} the GMap container's div
|
||
*/
|
||
getMapContainer: function() {
|
||
return this.mapObject.getContainer();
|
||
},
|
||
|
||
//
|
||
// TRANSLATION: MapObject Bounds <-> SuperMap.Bounds
|
||
//
|
||
|
||
/**
|
||
* APIMethod: getMapObjectBoundsFromOLBounds
|
||
*
|
||
* Parameters:
|
||
* olBounds - {<SuperMap.Bounds>}
|
||
*
|
||
* Returns:
|
||
* {Object} A MapObject Bounds, translated from olBounds
|
||
* Returns null if null value is passed in
|
||
*/
|
||
getMapObjectBoundsFromOLBounds: function(olBounds) {
|
||
var moBounds = null;
|
||
if (olBounds != null) {
|
||
var sw = this.sphericalMercator ?
|
||
this.inverseMercator(olBounds.bottom, olBounds.left) :
|
||
new SuperMap.LonLat(olBounds.bottom, olBounds.left);
|
||
var ne = this.sphericalMercator ?
|
||
this.inverseMercator(olBounds.top, olBounds.right) :
|
||
new SuperMap.LonLat(olBounds.top, olBounds.right);
|
||
moBounds = new GLatLngBounds(new GLatLng(sw.lat, sw.lon),
|
||
new GLatLng(ne.lat, ne.lon));
|
||
}
|
||
return moBounds;
|
||
},
|
||
|
||
|
||
/************************************
|
||
* *
|
||
* MapObject Interface Controls *
|
||
* *
|
||
************************************/
|
||
|
||
|
||
// Get&Set Center, Zoom
|
||
|
||
/**
|
||
* APIMethod: setMapObjectCenter
|
||
* Set the mapObject to the specified center and zoom
|
||
*
|
||
* Parameters:
|
||
* center - {Object} MapObject LonLat format
|
||
* zoom - {int} MapObject zoom format
|
||
*/
|
||
setMapObjectCenter: function(center, zoom) {
|
||
this.mapObject.setCenter(center, zoom);
|
||
},
|
||
|
||
/**
|
||
* APIMethod: dragPanMapObject
|
||
*
|
||
* Parameters:
|
||
* dX - {Integer}
|
||
* dY - {Integer}
|
||
*/
|
||
dragPanMapObject: function(dX, dY) {
|
||
this.dragObject.moveBy(new GSize(-dX, dY));
|
||
},
|
||
|
||
|
||
// LonLat - Pixel Translation
|
||
|
||
/**
|
||
* APIMethod: getMapObjectLonLatFromMapObjectPixel
|
||
*
|
||
* Parameters:
|
||
* moPixel - {Object} MapObject Pixel format
|
||
*
|
||
* Returns:
|
||
* {Object} MapObject LonLat translated from MapObject Pixel
|
||
*/
|
||
getMapObjectLonLatFromMapObjectPixel: function(moPixel) {
|
||
return this.mapObject.fromContainerPixelToLatLng(moPixel);
|
||
},
|
||
|
||
/**
|
||
* APIMethod: getMapObjectPixelFromMapObjectLonLat
|
||
*
|
||
* Parameters:
|
||
* moLonLat - {Object} MapObject LonLat format
|
||
*
|
||
* Returns:
|
||
* {Object} MapObject Pixel transtlated from MapObject LonLat
|
||
*/
|
||
getMapObjectPixelFromMapObjectLonLat: function(moLonLat) {
|
||
return this.mapObject.fromLatLngToContainerPixel(moLonLat);
|
||
},
|
||
|
||
|
||
// Bounds
|
||
|
||
/**
|
||
* APIMethod: getMapObjectZoomFromMapObjectBounds
|
||
*
|
||
* Parameters:
|
||
* moBounds - {Object} MapObject Bounds format
|
||
*
|
||
* Returns:
|
||
* {Object} MapObject Zoom for specified MapObject Bounds
|
||
*/
|
||
getMapObjectZoomFromMapObjectBounds: function(moBounds) {
|
||
return this.mapObject.getBoundsZoomLevel(moBounds);
|
||
},
|
||
|
||
/************************************
|
||
* *
|
||
* MapObject Primitives *
|
||
* *
|
||
************************************/
|
||
|
||
|
||
// LonLat
|
||
|
||
/**
|
||
* APIMethod: getMapObjectLonLatFromLonLat
|
||
*
|
||
* Parameters:
|
||
* lon - {Float}
|
||
* lat - {Float}
|
||
*
|
||
* Returns:
|
||
* {Object} MapObject LonLat built from lon and lat params
|
||
*/
|
||
getMapObjectLonLatFromLonLat: function(lon, lat) {
|
||
var gLatLng;
|
||
if(this.sphericalMercator) {
|
||
var lonlat = this.inverseMercator(lon, lat);
|
||
gLatLng = new GLatLng(lonlat.lat, lonlat.lon);
|
||
} else {
|
||
gLatLng = new GLatLng(lat, lon);
|
||
}
|
||
return gLatLng;
|
||
},
|
||
|
||
// Pixel
|
||
|
||
/**
|
||
* APIMethod: getMapObjectPixelFromXY
|
||
*
|
||
* Parameters:
|
||
* x - {Integer}
|
||
* y - {Integer}
|
||
*
|
||
* Returns:
|
||
* {Object} MapObject Pixel from x and y parameters
|
||
*/
|
||
getMapObjectPixelFromXY: function(x, y) {
|
||
return new GPoint(x, y);
|
||
}
|
||
|
||
};
|