maptalks - 线的模式填充动画

线的模式填充动画
index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>图形样式 - 线的模式填充动画</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: [-0.113049,51.49856],
        zoom: 12,
        baseLayer: new maptalks.TileLayer('base', {
          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>'
        })
      });

      var layer = new maptalks.VectorLayer('vector').addTo(map);

      var line = new maptalks.LineString(
        [
          map.getCenter().sub(0.1, 0),
          map.getCenter().add(0.1, 0)
        ],
        {
          symbol:{
            'linePatternFile' : 'pattern.png',
            'linePatternDx' : 0,
            'lineWidth' : 10
          }
        }
      ).addTo(layer);

      line.animate({
        symbol : {
          // 20 is the width of pattern.png to ensure seamless animation
          linePatternDx : 20
        }
      }, {
        repeat : true
      });

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