Symbol by geometry properties
index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Geometry Styles - Symbol by geometry properties</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
  </style>
  <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/[email protected]/dist/maptalks.css">
  <script type="text/javascript" src="https://cdn.jsdelivr.net/npm/[email protected]/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: 14,
        baseLayer: new maptalks.TileLayer('tile', {
          urlTemplate: 'http://{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('v').addTo(map);

      var c = map.getCenter();

      // based on function-type v0.18.0 plus support of identity
      // https://www.mapbox.com/mapbox-gl-js/style-spec/#types-function
      var symbol = {
        'markerType': 'ellipse',
        'markerFill': 'rgb(216,115,149)',
        'markerFillOpacity': { // use heat value in property
          'property': 'heat',
          'type' : 'identity'
        },
        'markerLineWidth': 0,
        'markerLineOpacity': 1,
        'markerWidth': 40,
        'markerHeight': 40
      };

      var marker1 = new maptalks.Marker(
        c.sub(0.020, 0),
        {
          'symbol' : symbol,
          'properties' : {
            'heat' : 1
          }
        }
      ).addTo(layer);

      var marker2 = new maptalks.Marker(
        c.sub(0.015, 0),
        {
          'symbol' : symbol,
          'properties' : {
            'heat' : 0.9
          }
        }
      ).addTo(layer);

      var marker3 = new maptalks.Marker(
        c.sub(0.010, 0),
        {
          'symbol' : symbol,
          'properties' : {
            'heat' : 0.8
          }
        }
      ).addTo(layer);

      var marker4 = new maptalks.Marker(
        c.sub(0.005, 0),
        {
          'symbol' : symbol,
          'properties' : {
            'heat' : 0.7
          }
        }
      ).addTo(layer);

      var marker5 = new maptalks.Marker(
        c,
        {
          'symbol' : symbol,
          'properties' : {
            'heat' : 0.6
          }
        }
      ).addTo(layer);


      var marker6 = new maptalks.Marker(
        c.add(0.005, 0),
        {
          'symbol' : symbol,
          'properties' : {
            'heat' : 0.5
          }
        }
      ).addTo(layer);

      var marker7 = new maptalks.Marker(
        c.add(0.010, 0),
        {
          'symbol' : symbol,
          'properties' : {
            'heat' : 0.4
          }
        }
      ).addTo(layer);

      var marker8 = new maptalks.Marker(
        c.add(0.015, 0),
        {
          'symbol' : symbol,
          'properties' : {
            'heat' : 0.3
          }
        }
      ).addTo(layer);

      var marker9 = new maptalks.Marker(
        c.add(0.020, 0),
        {
          'symbol' : symbol,
          'properties' : {
            'heat' : 0.2
          }
        }
      ).addTo(layer);

      var marker10 = new maptalks.Marker(
        c.add(0.025, 0),
        {
          'symbol' : symbol,
          'properties' : {
            'heat' : 0.1
          }
        }
      ).addTo(layer);


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