mirror of
https://github.com/jiawanlong/Cesium-Examples.git
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316 lines
12 KiB
JavaScript
316 lines
12 KiB
JavaScript
/**
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* Created with JetBrains WebStorm.
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* User: liuyayun
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* Date: 13-5-27
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* Time: 上午9:56
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* To change this template use File | Settings | File Templates.
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*/
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//判定一下是否存在了SuperMap.Web，如果没有则初始化一个
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if(SuperMap.Web == undefined )
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{
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SuperMap.Web = new Object();
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}
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//判定一下是否存在了SuperMap.Web.iConnector，如果没有则初始化一个
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if(SuperMap.Web.iConnector == undefined )
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{
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SuperMap.Web.iConnector = new Object();
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}
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/**
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* Class:
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* 天地图适配器类
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* @constructor
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*/
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SuperMap.Web.iConnector.Tianditu = function(){
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}
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/**
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* APIMethod:
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* 创建天地图的TTileLayer，这里的TTileLayer中切片的来源为iserver服务器
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* 当把此layer添加进map后，会从map里获取当前的投影是4326还是3857来动态的出图
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* @param url {String} 地图服务的url地址，如：“localhost:8090/iserver/services/map-world/rest/maps/World”
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* @param options 可选的参数
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* transparent - {Boolean} 设置切片是否透明，默认为true
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* cacheEnabled - {Boolean} 设置是否使用缓存，默认为false
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* layersID - {String} 设置临时图层的id，一般用于专题图的叠加使用
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* @returns {TTileLayer} 返回天地图的TTileLayer对象
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*/
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SuperMap.Web.iConnector.Tianditu.getLayer = function(url,options){
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if(url == undefined)
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{
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return;
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}
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var tileLayer = new TTileLayer();
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var layerUrl = url + "/image.png?redirect=false&width=256&height=256";
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//切片是否透明
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var transparent = true;
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if(options && options.transparent !=undefined)
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{
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transparent = options.transparent;
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}
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layerUrl += "&transparent=" + transparent;
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//是否是否使用缓存
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var cacheEnabled = false;
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if(options && options.cacheEnabled !=undefined)
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{
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cacheEnabled = options.cacheEnabled;
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}
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layerUrl += "&cacheEnabled=" + cacheEnabled;
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//如果有layersID，则是在使用专题图
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if(options && options.layersID !=undefined)
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{
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layerUrl += "&layersID=" +options.layersID;
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}
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//计算分辨率和比例尺
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var resLen = 17;
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var resStart = 0;
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var resolutions4326 = [];
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var resolutions3857 = [];
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var dpi = 95.99999999999984;
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var scales4326 = [];
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var scales3857 = [];
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for(var i=resStart;i<=resLen;i++){
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var res4326 = 1.40625/Math.pow(2,i);
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resolutions4326.push(res4326);
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var scale4326 = 0.0254*360/dpi/res4326/Math.PI/2/6378137;
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scales4326.push(scale4326);
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}
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tileLayer.scales4326 = scales4326;
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for(var i=resStart;i<=resLen;i++){
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var res3857 = 156543.0339/Math.pow(2,i);
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resolutions3857.push(res3857);
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var scale3857 = 0.0254/dpi/res3857;
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scales3857.push(scale3857);
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}
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tileLayer.scales3857 = scales3857;
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tileLayer.setGetTileUrl(
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function(x,y,z)
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{
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if(this.myProjectionCodeName)
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{}
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else
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{
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//遍历一下tileLayer，需找当前的投影系属性名称
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var ps = this.tmaps;
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for ( var p in ps )
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{
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if ( typeof ( ps [ p ]) == " function " )
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{
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}
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else
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{ // p 为属性名称，ps[p]为对应属性的值
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if(ps [ p ] == "EPSG:4326" || ps [ p ] == "EPSG:900913")
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{
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this.myProjectionCodeName = p;
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break;
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}
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}
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}
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}
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var tileUrl = layerUrl;
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if(this.tmaps[this.myProjectionCodeName] == "EPSG:4326")
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{
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tileUrl +="&scale=" +this.scales4326[z];
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tileUrl += "&prjCoordSys={\"epsgCode\":4326}";
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var orginX = -180;var orginY = 90;
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//使用center来出图 （也可以使用bounds出图）
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var centerX = orginX + resolutions4326[z] *x *256 + resolutions4326[z]*128;
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var centerY = orginY-( resolutions4326[z] *y *256 + resolutions4326[z]*128) ;
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tileUrl+= "¢er={\"x\":" + centerX+",\"y\":" + centerY + "}" ;
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return tileUrl;
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}
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else if(this.tmaps[this.myProjectionCodeName] == "EPSG:900913")
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{
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var po = Math.pow(2,z);
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x-=po/2;
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y=po/2-y-1;
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//使用bounds出图（也可以使用center）
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var left = x*256*resolutions3857[z];
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var bottom = y*256*resolutions3857[z];
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var right = (x + 1)*256*resolutions3857[z];
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var top = (y + 1)*256*resolutions3857[z];
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//将bounds组合到url里面
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tileUrl += "&viewBounds=" +"{\"leftBottom\" : {\"x\":" + left +",\"y\":" + bottom +"},\"rightTop\" : {\"x\":" + right +",\"y\":" +top + "}}";
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tileUrl +="&scale=" +this.scales3857[z];
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tileUrl += "&prjCoordSys={\"epsgCode\":3857}";
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}
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return tileUrl;
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}
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);
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return tileLayer;
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}
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/**
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* APIMethod:
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* 将其他坐标系下的点转换为天地图的点
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* @param array 点数组，支持四种形式的点：
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* 1、var points = [
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* {x:116.1,y:38.9},
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* {x:114.1,y:34.1}
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* ];
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* 2、var points = [
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* new SuperMap.Geometry.Point(116.1,38.9),
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* new SuperMap.Geometry.Point(116.1,38.9)
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* ];
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* 3、var points = [
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* new SuperMap.LonLat(116.1,38.9),
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* new SuperMap.LonLat(116.1,38.4)
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* ];
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* 4、var points = [
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* new TLngLat(116.38,39.9),
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* new TLngLat(116.38,39.9)
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* ];
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* @param projection {SuperMap.Projection} 待转换点的投影系（数组里面的所有点投影系都必须是统一的），默认为4326.
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* @returns {Array} 返回TLngLat对象的数组
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*/
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SuperMap.Web.iConnector.Tianditu.transferPoint = function(array,projection){
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if((typeof array) == "object" && array != null && array.constructor == Array)
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{
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var pro = projection || new SuperMap.Projection("EPSG:4326");
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var points = []
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//分几种不同的情况
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for(var i = 0;i<array.length;i++)
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{
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var smPoint;
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if(array[i].CLASS_NAME && array[i].CLASS_NAME == "SuperMap.LonLat")
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{
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//首先转换为标准4326的坐标
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smPoint = SuperMap.Projection.transform(new SuperMap.Geometry.Point(array[i].lon,array[i].lat),pro,new SuperMap.Projection("EPSG:4326"));
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}
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//支持{x:118,y:38}和SuperMap.Geometry.Point的形式，因为都存在x和y
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else if(array[i].x != undefined && array[i].y != undefined)
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{
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//首先转换为标准4326的坐标
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smPoint = SuperMap.Projection.transform(new SuperMap.Geometry.Point(array[i].x,array[i].y),pro,new SuperMap.Projection("EPSG:4326"));
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}
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//支持天地图的TLngLat的形式
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else if(array[i].getLng != undefined && array[i].getLat != undefined)
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{
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//首先转换为标准4326的坐标
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smPoint = SuperMap.Projection.transform(new SuperMap.Geometry.Point(array[i].getLng(),array[i].getLat()),projection,new SuperMap.Projection("EPSG:4326"));
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}
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var point = new TLngLat(smPoint.x,smPoint.y);
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points.push(point);
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}
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return points;
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}
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}
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/**
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* APIMethod:
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* 将其他坐标系下的线数组转换为天地图支持的线数组
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* @param array 线数组，支持两种形式
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* 1、var lines = [new SuperMap.Geometry.LineString(
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* new SuperMap.Geometry.Point(116.1,38.9),
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* new SuperMap.Geometry.Point(116.1,38.9)
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* )];
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* 2、var lines = [new TPolyline(
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* new TLngLat(116.38,39.9),
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* new TLngLat(116.38,39.9)
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* )];
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* @param projection {SuperMap.Projection} 需要转换的线的坐标系
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* @returns {Array} 返回TPolyline对象的数组
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*/
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SuperMap.Web.iConnector.Tianditu.transferLine = function(array,projection){
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if((typeof array) == "object" && array != null && array.constructor == Array)
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{
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var pro = projection || new SuperMap.Projection("EPSG:4326");
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var lines = [];
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//分几种不同的情况，现在只提供两种
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for(var i = 0;i<array.length;i++)
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{
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var line;
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//支持supermap的LineString
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if(array[i].CLASS_NAME && array[i].CLASS_NAME == "SuperMap.Geometry.LineString")
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{
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var points = SuperMap.Web.iConnector.Tianditu.transferPoint(array[i].components,pro);
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line = new TPolyline(points);
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}
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//支持TPolyline的对象
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else if(array[i].polygonType != undefined && array[i].getType() == 4)
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{
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var points = SuperMap.Web.iConnector.Tianditu.transferPoint(array[i].getLngLats(),pro);
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line = new TPolyline(points);
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}
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lines.push(line);
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}
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return lines;
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}
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}
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/**
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* APIMethod:
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* 将其他坐标系下的多边形数组转换为天地图支持的多边形数组
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* @param array 多边形数组，支持两种形式：
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* 1、var polygons = [new SuperMap.Geometry.Polygon(
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* [new SuperMap.Geometry.LinearRing(
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* new SuperMap.Geometry.Point(116.3786889372559,39.90762965106183),
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* new SuperMap.Geometry.Point(116.38632786853032,39.90795884517671),
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* new SuperMap.Geometry.Point(116.38534009082035,39.897432133833574),
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* new SuperMap.Geometry.Point(116.37624058825688,39.89789300648029)
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* )
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* ]
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* )];
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* 2、var polygons = [new TPolygon(
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* new TLngLat(116.3786889372559,39.90762965106183),
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* new TLngLat(116.38632786853032,39.90795884517671),
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* new TLngLat(116.38534009082035,39.897432133833574),
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* new TLngLat(116.37624058825688,39.89789300648029)
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* )];
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* @param projection {SuperMap.Projection} 需要转换的多边形的坐标系
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* @returns {Array} 返回TPolygon对象的数组
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*/
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SuperMap.Web.iConnector.Tianditu.transferPolygon = function(array,projection){
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if((typeof array) == "object" && array != null && array.constructor == Array)
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{
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var pro = projection || new SuperMap.Projection("EPSG:4326");
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var polygons = [];
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//分几种不同的情况，现在只提供两种
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for(var i = 0;i<array.length;i++)
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{
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var polygon;
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//支持supermap的Polygon
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if(array[i].CLASS_NAME && array[i].CLASS_NAME == "SuperMap.Geometry.Polygon")
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{
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var points = SuperMap.Web.iConnector.Tianditu.transferPoint(array[i].getVertices(false),pro);
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polygon = new TPolygon(points);
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}
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//支持TPolyline的对象
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else if(array[i].getType != undefined && array[i].getType() == 5)
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{
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var points = SuperMap.Web.iConnector.Tianditu.transferPoint(array[i].getLngLats(),pro);
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polygon = new TPolygon(points);
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}
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polygons.push(polygon);
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}
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return polygons;
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}
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}
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