243 lines
8.4 KiB
JavaScript
243 lines
8.4 KiB
JavaScript
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/**
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* @requires SuperMap/Layer/CanvasLayer.js
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* @requires SuperMap/Layer/Grid.js
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* @requires SuperMap/Tile/Image.js
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*/
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/**
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* Class: SuperMap.Layer.ArcGIS93Rest
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* ArcGIS服务图层类。
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* 用于显示ArcGIS Server 9.3的地图，使用<SuperMap.Layer.ArcGIS93Rest>的
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* 构造函数可以创建ArcGIS93Rest图层，更多信息查看：
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* http://sampleserver1.arcgisonline.com/ArcGIS/SDK/REST/index.html ;
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*
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*
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*
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* Inherits from:
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* - <SuperMap.Layer.CanvasLayer>
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*/
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SuperMap.Layer.ArcGIS93Rest = SuperMap.Class(SuperMap.CanvasLayer, {
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/**
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* Constant: DEFAULT_PARAMS
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* {Object} Hashtable of default parameter key/value pairs
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*/
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DEFAULT_PARAMS: {
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format: "png"
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},
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/**
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* APIProperty: isBaseLayer
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* {Boolean} 是否为底图（默认为true）
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*/
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isBaseLayer: true,
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/**
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* Property: attribution
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* {String} The layer attribution.
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*/
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attribution: "Data By <a style='white-space: nowrap' target='_blank' href='http://www.arcgisonline.cn/'>ESRI</a>",
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/**
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* Constructor: SuperMap.Layer.ArcGIS93Rest
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* 创建ArcGIS93Rest图层
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*
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* Example:
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* (code)
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*
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* var arcims = new SuperMap.Layer.ArcGIS93Rest("MyName",
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* "http://sampleserver1.arcgisonline.com/ArcGIS/rest/services/Demographics/ESRI_Population_World/MapServer/export",
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* {
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* layers: "show:0,1,2"
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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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* url - {String} ArcGIS的REST服务url地址，服务地址目录为http://sampleserver1.arcgisonline.com/ArcGIS/rest/services
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* 或者http://www.arcgisonline.cn/ArcGIS/rest/services等，在目录下可以找到需要的具体服务
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* params - {Object} 设置到url上的可选参数。
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* options - {Object} 此类及其父类开放的属性。
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*
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* Allowed params properties:
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* layers - {String} 设置需要出现在导出地图中的图层。有四种方法来指定哪些图层需要显示：
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* show（只有在此列表中指定的图层才能用于出图）；
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* hide（除了在此列表中的所有图层都将用于出图）；
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* include（在默认图层外，额外增加的图层）；
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* exclude（在默认图层内部排除掉的图层）；
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*
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* Allowed options properties:
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* useCanvas - {Boolean} 是否使用Canvas绘制
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*/
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initialize: function(name, url, params, options) {
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var me=this,newArguments = [];
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//将params参数转换为大写
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params = SuperMap.Util.upperCaseObject(params);
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newArguments.push(name, url, params, options);
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SuperMap.CanvasLayer.prototype.initialize.apply(me, newArguments);
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SuperMap.Util.applyDefaults(me.params, SuperMap.Util.upperCaseObject(me.DEFAULT_PARAMS));
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//layer is transparent
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//如下代码暂不考虑
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if (this.params.TRANSPARENT &&
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this.params.TRANSPARENT.toString().toLowerCase() == "true") {
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// unless explicitly set in options, make layer an overlay
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if ( (options == null) || (!options.isBaseLayer) ) {
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this.isBaseLayer = false;
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}
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// jpegs can never be transparent, so intelligently switch the
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// format, depending on the browser's capabilities
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if (this.params.FORMAT == "jpg") {
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this.params.FORMAT = SuperMap.Util.alphaHack() ? "gif"
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: "png";
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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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* 解构ArcGIS93Rest类，释放资源。
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*/
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destroy: function() {
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// for now, nothing special to do here.
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SuperMap.CanvasLayer.prototype.destroy.apply(this, arguments);
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},
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/**
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* APIMethod: clone
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* 创建当前图层的副本
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* Parameters:
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* obj - {Object}
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* Returns:
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* {<SuperMap.Layer.ArcGIS93Rest>}
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*/
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clone: function (obj) {
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if (obj == null) {
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obj = new SuperMap.Layer.ArcGIS93Rest(this.name,
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this.url,
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this.params,
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this.getOptions());
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}
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//get all additions from superclasses
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obj = SuperMap.CanvasLayer.prototype.clone.apply(this, [obj]);
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// copy/set any non-init, non-simple values here
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return obj;
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},
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/**
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* Method: getURL
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* 获取瓦片的URL。
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*
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* Parameters:
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* bounds - {<SuperMap.Bounds>} 瓦片的bounds。
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*
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* Returns:
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* {String} 瓦片的URL
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*/
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getURL: function (bounds) {
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bounds = this.adjustBounds(bounds);
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// ArcGIS Server only wants the numeric portion of the projection ID.
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var projWords = this.projection.getCode().split(":");
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var srid = projWords[projWords.length - 1];
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var imageSize = this.getImageSize();
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//基于需求的考虑，很多参数都是默认的，并没有公开出来，
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// 以后有用得到的时候在这里修改，也可能会在此类里面添加几个属性来初始化
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//
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var newParams = {
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'BBOX': bounds.toBBOX(),
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'SIZE': imageSize.w + "," + imageSize.h,
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// We always want image, the other options were json, image with a whole lotta html around it, etc.
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'F': "image",
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'BBOXSR': srid,
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'IMAGESR': srid
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};
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// Now add the filter parameters.
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//设置图层筛选参数
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if (this.layerDefs) {
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var layerDefStrList = [];
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var layerID;
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for(layerID in this.layerDefs) {
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if (this.layerDefs.hasOwnProperty(layerID)) {
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if (this.layerDefs[layerID]) {
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layerDefStrList.push(layerID);
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layerDefStrList.push(":");
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layerDefStrList.push(this.layerDefs[layerID]);
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layerDefStrList.push(";");
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}
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}
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}
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if (layerDefStrList.length > 0) {
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newParams['LAYERDEFS'] = layerDefStrList.join("");
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}
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}
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var requestString = this.getFullRequestString(newParams);
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return requestString;
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},
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/**
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* Method: setLayerFilter
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* 在创建瓦片的时候修改layerDefs参数
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* Parameters:
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* id - {String} 对应的图层id
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* queryDef - {String} 需要替代以前参数的描述，
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* layerDefs主要用于筛选某个图层里面的信息，
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* 以便确定在出图的时候确定需要显示哪些信息，详情请查看：
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* http://sampleserver1.arcgisonline.com/ArcGIS/SDK/REST/export.html
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*/
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setLayerFilter: function ( id, queryDef ) {
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if (!this.layerDefs) {
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this.layerDefs = {};
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}
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if (queryDef) {
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this.layerDefs[id] = queryDef;
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} else {
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delete this.layerDefs[id];
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}
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},
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/**
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* Method: clearLayerFilter
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* 清除参数layerDefs
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*
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* Parameters:
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* id - {String} 需要清除的图层的id
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*/
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clearLayerFilter: function ( id ) {
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if (id) {
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delete this.layerDefs[id];
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} else {
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delete this.layerDefs;
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}
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},
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/**
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* Method: mergeNewParams
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* 动态的给基类创建一个params参数转换方法
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*
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*
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* 当params改变时将这些参数转换为大写
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*
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* Parameters:
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* newParams - {Object} 新改变的params参数
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*/
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mergeNewParams:function(newParams) {
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var upperParams = SuperMap.Util.upperCaseObject(newParams);
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var newArguments = [upperParams];
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return SuperMap.CanvasLayer.prototype.mergeNewParams.apply(this,
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newArguments);
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},
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CLASS_NAME: "SuperMap.Layer.ArcGIS93Rest"
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});
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