mirror of
https://github.com/jiawanlong/Cesium-Examples.git
synced 2025-07-05 15:47:34 +00:00
286 lines
11 KiB
JavaScript
286 lines
11 KiB
JavaScript
//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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* OpenLayers3适配器类
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* @constructor
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*/
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SuperMap.Web.iConnector.OpenLayers3 = function(){
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}
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/**
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* APIMethod:
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* 创建OpenLayers3的图层new ol.Layer.Tile，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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* @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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* @returns {Object} 返回OpenLayers3的扩展图层对象
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*/
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SuperMap.Web.iConnector.OpenLayers3.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 ol.layer.Tile({
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source:getSource()
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});
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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pro，并且只能是4326或者3857的地图。
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var pro="3857";
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if(options&&options.pro){
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if(options.pro==="4326"){
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pro="4326";
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}
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}
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layerUrl+="&projection="+pro;
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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 dpi = 95.99999999999984;
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var scales3857=[];
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var scales4326=[];
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var resolutions3857=[];
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var resolutions4326=[];
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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.scales=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.scales=scales4326;
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function getSource(){
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var tileUrl;
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var source= new ol.source.TileImage({
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tileUrlFunction:function(tileCoord, pixelRatio, projection){
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var z=tileCoord[0], x= tileCoord[1],y =tileCoord[2];
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if(pro==="3857"){
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x-= Math.pow(2,z-1);
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y+=Math.pow(2,z-1);
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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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tileUrl = layerUrl+"&viewBounds=" +"{\"leftBottom\" : {\"x\":" + left +",\"y\":" + bottom +"},\"rightTop\" : {\"x\":" + right +",\"y\":" +top + "}}";
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tileUrl +="&scale=" +scales3857[z];
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}
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else if(pro==="4326"){
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x-= Math.pow(2,z-1);
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y+=Math.pow(2,z-1);
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var left = x*256*resolutions4326[z];
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var bottom = y*256*resolutions4326[z];
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var right = (x + 1)*256*resolutions4326[z];
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var top = (y+1)*256*resolutions4326[z];
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tileUrl = layerUrl+"&viewBounds=" +"{\"leftBottom\" : {\"x\":" + left +",\"y\":" + bottom +"},\"rightTop\" : {\"x\":" + right +",\"y\":" +top + "}}";
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tileUrl +="&scale=" +scales4326[z];
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}
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var epsg=pro==="3857"?3857:4326;
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tileUrl += "&prjCoordSys={\"epsgCode\":"+epsg+"}";
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return tileUrl;
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}
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});
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return source;
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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OpenLayers3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 ol.geom.Point([39.9,116.38]),
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* new ol.geom.Point([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ol.geom.Point对象的数组
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*/
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SuperMap.Web.iConnector.OpenLayers3.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OpenLayers3的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 point = new ol.geom.Point([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OpenLayers3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 ol.geom.LineString( [39.9,116.38],[0,0])];
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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LineString对象的数组
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*/
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SuperMap.Web.iConnector.OpenLayers3.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.OpenLayers3.transferPoint(array[i].components,pro);
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line = new ol.geom.LineString(getcoordinate(points));
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}
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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 ol.geom.LineString(getcoordinate(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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function getcoordinate(points){
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var coordinates=[];
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for(var i=0;i<points.length;i++){
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coordinates.push(points[i].getCoordinates());
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}
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return coordinates;
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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OpenLayers3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 ol.geom.Polygon([[39.9,116.38],[0,0],[30.34,110.34]])];
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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Polygon对象的数组
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*/
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SuperMap.Web.iConnector.OpenLayers3.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.OpenLayers3.transferPoint(array[i].getVertices(false),pro);
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polygon = new ol.geom.Polygon([getcoordinate(points)]);
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}
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//支持Polygon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.OpenLayers3.transferPoint(array[i].getLngLats(),pro);
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polygon = new ol.geom.Polygon([getcoordinate(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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