WebTileLayer
WebTileLayer (中文:网络切片图层)提供了一种简单的添加非 ArcGIS Server 的地图切片到地图的方式。构造函数采用的 URL 模板的模式是 http://some.domain.com/{level}/{col}/{row}/ 。level、col、row 分别指切片的缩放级别、列数、行数。这种模式不是必须的,但是是很常用的。
子域可以加速切片检索,使用子域可以绕过浏览器对一个域的最大并发数量限制。WebTileLayer 的 subDomains 属性用于指定子域。如果设置了 subDomains,那么 URL 模板应该包含 {subDomain} 占位符。
这个示例显示了如何添加网络切片图层(WebTileLayer)到地图。
程序的完整源代码如下:
<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no">
<title>WebTileLayer - 4.5</title>
<style>
html,
body,
#viewDiv {
padding: 0;
margin: 0;
height: 100%;
width: 100%;
}
</style>
<link rel="stylesheet" href="https://js.arcgis.com/4.5/esri/css/main.css">
<script src="https://js.arcgis.com/4.5/"></script>
<script>
require([
"esri/config",
"esri/layers/WebTileLayer",
"esri/Map",
"esri/views/SceneView",
"dojo/dom",
"dojo/domReady!"
], function(esriConfig, WebTileLayer, Map, SceneView, dom) {
// 请求加入跨域名单
esriConfig.request.corsEnabledServers
.push("a.tile.stamen.com", "b.tile.stamen.com", "c.tile.stamen.com",
"d.tile.stamen.com");
var map = new Map({
ground: "world-elevation"
});
var view = new SceneView({
container: "viewDiv",
map: map,
scale: 123456789,
center: [-65, -15]
});
var tiledLayer = new WebTileLayer({
urlTemplate: "http://{subDomain}.tile.stamen.com/toner/{level}/{col}/{row}.png",
subDomains: ["a", "b", "c", "d"],
copyright: "Map tiles by <a href=\"http://stamen.com/\">Stamen Design</a>, " +
"under <a href=\"http://creativecommons.org/licenses/by/3.0\">CC BY 3.0</a>. " +
"Data by <a href=\"http://openstreetmap.org/\">OpenStreetMap</a>, " +
"under <a href=\"http://creativecommons.org/licenses/by-sa/3.0\">CC BY SA</a>."
});
map.add(tiledLayer);
});
</script>
</head>
<body>
<div id="viewDiv"></div>
</body>
</html>
程序执行效果如下:
(完)