mirror of
https://github.com/jiawanlong/Cesium-Examples.git
synced 2025-07-06 08:17:31 +00:00
321 lines
12 KiB
JavaScript
321 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: 下午3:06
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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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* Leaflet适配器类
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* @constructor
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*/
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SuperMap.Web.iConnector.Leaflet = function(){
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}
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/**
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* APIMethod:
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* 创建Leaflet的图层L.tileLayer.canvas，这里的图层中切片的来源为iserver服务器（支持3857的地图和4326的地图）
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* (start code)
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* //新建map
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* map = L.map('map',{
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* center: [0, 0],
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* zoom:2,
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* crs:L.CRS.EPSG4326 //定义坐标参考系统
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* });
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* //使用下面的方法将图层添加到map
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* var tileLayer= SuperMap.Web.iConnector.Leaflet.getLayer(url,{projection:"4326"});
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* tileLayer.addTo(map);
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* (end)
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* @param url {String} 地图服务的url地址，如：“http://localhost:8090/iserver/services/map-china400/rest/maps/China”
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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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* projection-{String}设置图层的投影系，可设置为"3857"或者"4326"，默认为"3857"
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* @returns {Object} 返回Leaflet的扩展图层对象
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*/
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SuperMap.Web.iConnector.Leaflet.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 layer = L.tileLayer.canvas();
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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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//如果有projection，并且只能是4326或者3857的地图。
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var projection="3857";
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if(options&&options.projection){
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if(options.projection==="4326"){
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projection="4326";
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}
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}
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layerUrl+="&projection="+projection;
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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 resolutions=[];
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var dpi = 95.99999999999984;
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var scales=[];
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if(projection==="3857"){
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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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resolutions.push(res3857);
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var scale3857 = 0.0254/dpi/res3857;
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scales.push(scale3857);
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}
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layer.scales=scales;
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}
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else{
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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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resolutions.push(res4326);
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var scale4326 = 0.0254*360/dpi/res4326/Math.PI/2/6378137;
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scales.push(scale4326);
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}
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layer.scales=scales;
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}
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layer.url = layerUrl;
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layer.drawTile = function(canvas, tilePoint, zoom){
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var ctx = canvas.getContext('2d');
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var x = tilePoint.x;
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var y = tilePoint.y;
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var po = Math.pow(2,zoom);
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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*resolutions[ zoom];
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var bottom = y*256*resolutions[zoom];
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var right = (x + 1)*256*resolutions[zoom];
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var top = (y + 1)*256*resolutions[zoom];
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//将bounds组合到url里面
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tileUrl =this.url + "&viewBounds=" +"{\"leftBottom\" : {\"x\":" + left +",\"y\":" + bottom +"},\"rightTop\" : {\"x\":" + right +",\"y\":" +top + "}}";
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tileUrl +="&scale=" +scales[zoom];
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var epsg=projection==="3857"?3857:4326;
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tileUrl += "&prjCoordSys={\"epsgCode\":"+epsg+"}";
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this.preImage(tileUrl,function(){
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ctx.drawImage(this,0,0,256,256);
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});
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}
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layer.preImage = function(url,callback){
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var img = new Image(); //创建一个Image对象，实现图片的预下载
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img.src = url;
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if (img.complete) { // 如果图片已经存在于浏览器缓存，直接调用回调函数
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callback.call(img);
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return; // 直接返回，不用再处理onload事件
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}
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img.onload = function () { //图片下载完毕时异步调用callback函数。
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callback.call(img);//将回调函数的this替换为Image对象
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};
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}
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return layer;
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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Leaflet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 L.LatLng(39.9,116.38),
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* new L.LatLng(39.9,116.35)
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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L.LatLng对象的数组
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*/
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SuperMap.Web.iConnector.Leaflet.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leaflet的L.LatLng的形式
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else if(array[i].lat != undefined && array[i].lng != 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].lng,array[i].lat),projection,new SuperMap.Projection("EPSG:4326"));
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}
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var traPoint = SuperMap.Web.iConnector.Leaflet.transfer(smPoint.x,smPoint.y);
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var point = new L.LatLng(traPoint.lat,traPoint.lng);
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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leaflet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 L.Polyline(
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* [
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* new L.LatLng(39.9,116.38),
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* new L.LatLng(39.4,116.38)
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* ]
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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L.Polyline对象的数组
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*/
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SuperMap.Web.iConnector.Leaflet.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.Leaflet.transferPoint(array[i].components,pro);
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line = new L.Polyline(points);
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}
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//支持L.Polyline的对象
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else if(array[i].constructor == L.Polyline)
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{
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var points = SuperMap.Web.iConnector.Leaflet.transferPoint(array[i].getLatLngs(),pro);
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line = new L.Polyline(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leaflet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 L.Polygon(
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* [
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* new L.LatLng(39.90762965106183,116.3786889372559),
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* new L.LatLng(39.90795884517671,116.38632786853032),
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* new L.LatLng(39.897432133833574,116.38534009082035),
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* new L.LatLng(39.89789300648029,116.37624058825688)
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* ]
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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L.Polygon对象的数组
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*/
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SuperMap.Web.iConnector.Leaflet.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.Leaflet.transferPoint(array[i].getVertices(false),pro);
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polygon = new L.Polygon(points);
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}
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//支持TPolyline的对象
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else if(array[i].constructor == L.Polygon)
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{
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var points = SuperMap.Web.iConnector.Leaflet.transferPoint(array[i].getLatLngs(),pro);
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polygon = new L.Polygon(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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/**
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* APIMethod:
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* 数据纠偏方法，未实现。
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* 由于底图和数据都存在标准和偏移的情况，当用户的底图和数据都是标准或者偏移的，那不需要实现此方法，如果不一致需要用户实现两者之间的转换
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* 当用户需要纠偏时，则需要覆盖此方法，内部每次转换前会调用此方法，将待转换的经度坐标和纬度坐标传进来，通过用户的方式实现纠偏后按照形如
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* {lng:116.4,lat:39.4}的格式返回即可
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*
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* @param lng {Number} 需要纠偏的经度坐标
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* @param lat {Number} 需要纠偏的纬度坐标
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* @returns {Object} 返回一个Object对象，如：{lng:116.4,lat:39.4}
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*/
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SuperMap.Web.iConnector.Leaflet.transfer = function(lng,lat){
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return {lng:lng,lat:lat};
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}
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