ArcGIS API for JavaScript 4.4 版本加载谷歌地图
ArcGIS API for JavaScript 4.X 版本升级后，API发生了很大的变化。
其中就支持了WebEarth展示，主要是通过 esri/views/SceneView 实现的。
在新版本中，默认都是加载Esri自己的地图。
若想加载其他地图，可以通过扩展BaseTileLayer实现。
例如，最新版本加载谷歌地图的demo如下：
<!DOCTYPE html> <html> <head> <meta charset="utf-8"> <meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no"> <title>Custom TileLayer - 4.4</title> <link rel="stylesheet" href="https://js.arcgis.com/4.4/esri/css/main.css"> <style> html, body, #viewDiv { padding: 0; margin: 0; height: 100%; width: 100%; } </style> <script src="https://js.arcgis.com/4.4/"></script> <script> require([ "esri/Map", "esri/config", "esri/request", "esri/Color", "esri/views/SceneView", "esri/widgets/LayerList", "esri/layers/BaseTileLayer", "dojo/domReady!" ], function( Map, esriConfig, esriRequest, Color, SceneView, LayerList, BaseTileLayer ) { // ******************************************************* // Custom tile layer class code // Create a subclass of BaseTileLayer // ******************************************************* var TintLayer = BaseTileLayer.createSubclass({ properties: { urlTemplate: null, tint: { value: null, type: Color } }, // generate the tile url for a given level, row and column getTileUrl: function(level, row, col) { return this.urlTemplate.replace("{z}", level).replace("{x}", col).replace("{y}", row); }, // This method fetches tiles for the specified level and size. // Override this method to process the data returned from the server. fetchTile: function(level, row, col) { // call getTileUrl() method to construct the URL to tiles // for a given level, row and col provided by the LayerView var url = this.getTileUrl(level, row, col); // request for tiles based on the generated url // set allowImageDataAccess to true to allow // cross-domain access to create WebGL textures for 3D. return esriRequest(url, { responseType: "image", allowImageDataAccess: true }) .then(function(response) { // when esri request resolves successfully // get the image from the response var image = response.data; var width = this.tileInfo.size[0]; var height = this.tileInfo.size[0]; // create a canvas with 2D rendering context var canvas = document.createElement("canvas"); var context = canvas.getContext("2d"); canvas.width = width; canvas.height = height; // Draw the blended image onto the canvas. context.drawImage(image, 0, 0, width, height); return canvas; }.bind(this)); } }); // ******************************************************* // Start of JavaScript application // ******************************************************* // Add stamen url to the list of servers known to support CORS specification. esriConfig.request.corsEnabledServers.push("http://www.google.cn/"); // Create a new instance of the TintLayer and set its properties var stamenTileLayer = new TintLayer({ urlTemplate: "http://www.google.cn/maps/vt/lyrs=s@142&hl=zh-CN&gl=cn&x={x}&y={y}&z={z}&s=Galil", tint: new Color("#004FBB"), title: "Google Map" }); // add the new instance of the custom tile layer the map var map = new Map({ layers: [stamenTileLayer] }); // create a new scene view and add the map var view = new SceneView({ container: "viewDiv", map: map, center: [0, 30], zoom: 3 }); // create a layer list widget var layerList = new LayerList({ view: view, }); view.ui.add(layerList, "top-right"); }); </script> </head> <body> <div id="viewDiv"></div> </body> </html>
最终展示效果如下
