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
