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线的曲线平滑
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index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>图形样式 - 线的曲线平滑</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: 13,
        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 c = map.getCenter();

      //background red polygon
      new maptalks.Polygon([
        c.add(-0.0302, 0.0081),
        c.add(-0.0369, 0.0069),
        c.add(-0.0469, 0.0032),
        c.add(-0.0414, -0.003),
        c.add(-0.0378, -0.008),
        c.add(-0.0320, -0.009)
      ], {
        'symbol' : {
          'lineColor' : '#f00',
          'shadowBlur' : 10,
          'shadowOffsetX' : 10,
          'shadowOffsetY' : 10
        }
      }).addTo(layer);

      new maptalks.Polygon([
        c.add(-0.0302, 0.0081),
        c.add(-0.0369, 0.0069),
        c.add(-0.0469, 0.0032),
        c.add(-0.0414, -0.003),
        c.add(-0.0378, -0.008),
        c.add(-0.0320, -0.009)
      ], {
        smoothness : 0.5,
        'symbol' : getSymbol()
      }).addTo(layer);

      //background red line
      new maptalks.LineString([
        c.add(-0.0202, 0.0081),
        c.add(-0.0269, 0.0069),
        c.add(-0.0369, 0.0032),
        c.add(-0.0314, -0.003),
        c.add(-0.0278, -0.008),
        c.add(-0.0220, -0.009)
      ], {
        'symbol' : {
          'lineColor' : '#f00',
          'shadowBlur' : 10,
          'shadowOffsetX' : 10,
          'shadowOffsetY' : 10
        }
      }).translate(0.04, 0).addTo(layer);

      new maptalks.LineString([
        c.add(-0.0202, 0.0081),
        c.add(-0.0269, 0.0069),
        c.add(-0.0369, 0.0032),
        c.add(-0.0314, -0.003),
        c.add(-0.0278, -0.008),
        c.add(-0.0220, -0.009)
      ], {
        smoothness : 0.5,
        'symbol' : getSymbol()
      }).translate(0.04, 0).addTo(layer);


      function getSymbol() {
        return [
          {
            lineColor: '#34495e',
            lineWidth: 3
          },
          {
            markerType : 'ellipse',
            markerWidth : 8,
            markerHeight : 8,
            markerFill : '#f00',
            markerPlacement : 'vertex'
          }
        ];
      }

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