maptalks - Canvas渲染方式的瓦片图层

Canvas渲染方式的瓦片图层

TileLayer有两个renderer: canvas 和 gl(默认), 浏览器不支持webgl时(IE9/10), 会自动切换为canvas

它们的不同点如下, 请根据实际情况选用不同的renderer:

renderer	支持IE9/10	支持三维	必须允许跨域
gl	否	是	是
canvas	是	否	否*

* 但在调用map.toDataURL导出图片时, 瓦片必须支持跨域, 且TileLayer必须设置crossOrigin

index.html

<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>瓦片图层与地理投影 - Canvas渲染方式的瓦片图层</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
  </style>
  <link rel="stylesheet" href="https://unpkg.com/maptalks/dist/maptalks.css">
  <script type="text/javascript" src="https://unpkg.com/maptalks/dist/maptalks.min.js"></script>
  <body>
    <div id="map" class="container"></div>

    <script>
      var map = new maptalks.Map('map', {
        center:     [-0.113049,51.498568],
        zoom:  13,
        baseLayer : new maptalks.TileLayer('base',{
          renderer : 'canvas', // set TileLayer's renderer to canvas
          // crossOrigin : 'anonymous',
          urlTemplate: 'https://{s}.basemaps.cartocdn.com/light_all/{z}/{x}/{y}.png',
          subdomains: ['a','b','c','d'],
          attribution: '&copy; <a href="http://osm.org">OpenStreetMap</a> contributors, &copy; <a href="https://carto.com/">CARTO</a>'
        })
      });

    </script>
  </body>
</html>