Canvas图层

使用CanvasLayer在地图上添加canvas图层。

源代码编辑器

 <!DOCTYPE html>
<html lang="en">
<head>
 <meta charset="utf-8">
 <meta http-equiv="X-UA-Compatible" content="IE=edge">
 <title>ImageLayer</title>
 <meta id="viewport" name="viewport" content="width=device-width,user-scalable=no,initial-scale=1.0,maximum-scale=1.0"/>
 <style>
 html,
 body,
 #container {
 margin: 0;
 padding: 0;
 width: 100%;
 height: 100%;
 }
 </style>
</head>
<body>
<div id="container"></div>
<script src="//webapi.amap.com/maps?v=2.0&key=您申请的key值"></script>
<script>
 var map = new AMap.Map('container', {
 viewMode:"3D",
 zoom: 15,
 center: [116.335183, 39.941735]
 });
 AMap.plugin(["AMap.ControlBar"], function () {
 var bar = new AMap.ControlBar();
 map.addControl(bar);
 });
 /*
 * 添加Canvas图层
 */
 var canvas = document.createElement('canvas');
 canvas.width = canvas.height = 200;
 var context = canvas.getContext('2d')
 context.fillStyle = 'rgb(0,100,255)';
 context.strokeStyle = 'white';
 context.globalAlpha = 1;
 context.lineWidth = 2;
 var radious = 0;
 var draw = function () {
 context.clearRect(0, 0, 200, 200)
 context.globalAlpha = (context.globalAlpha - 0.01 + 1) % 1;
 radious = (radious + 1) % 100;
 context.beginPath();
 context.arc(100, 100, radious, 0, 2 * Math.PI);
 context.fill();
 context.stroke();
 // 刷新渲染图层
 CanvasLayer.reFresh();
 AMap.Util.requestAnimFrame(draw);
 };
 var CanvasLayer = new AMap.CanvasLayer({
 canvas: canvas,
 bounds: new AMap.Bounds(
 [116.328911, 39.937229],
 [116.342659, 39.946275]
 ),
 zooms: [3, 18],
 });
 map.addLayer(CanvasLayer);
 draw();
</script>
</body>
</html>
 
 

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