ArcGIS API for JavaScript 4.X 版本加载北斗天地图地图
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，最新版本加载高德地图的demo如下：
[html] view plain copy
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Custom TileLayer - 4.6</title>
<link rel="stylesheet" href="https://js.arcgis.com/4.6/esri/css/main.css">
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<script src="https://js.arcgis.com/4.6/"></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("t0.tianditu.cn");
var stamenTileLayer = new TintLayer({
urlTemplate: "http://t0.tianditu.cn/img_w/wmts?service=wmts&request=GetTile&version=1.0.0&LAYER=cia&tileMatrixSet=w&TileMatrix={z}&TileRow={y}&TileCol={x}&style=default&format=tiles",
tint: new Color("#004FBB"),
title: "北斗天地图"
});
// 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>
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，最新版本加载高德地图的demo如下：
[html] view plain copy
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>Custom TileLayer - 4.6</title>
<link rel="stylesheet" href="https://js.arcgis.com/4.6/esri/css/main.css">
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<script src="https://js.arcgis.com/4.6/"></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("t0.tianditu.cn");
var stamenTileLayer = new TintLayer({
urlTemplate: "http://t0.tianditu.cn/img_w/wmts?service=wmts&request=GetTile&version=1.0.0&LAYER=cia&tileMatrixSet=w&TileMatrix={z}&TileRow={y}&TileCol={x}&style=default&format=tiles",
tint: new Color("#004FBB"),
title: "北斗天地图"
});
// 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>
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