index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Geometry Styles - Polygon symbol</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: 13,
        baseLayer: new maptalks.TileLayer('base', {
          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('vector').addTo(map);

      var rect = new maptalks.Rectangle(
        [-0.143049,51.50856], 4250, 3000,
        {
          symbol:{
            'polygonFill' : 'rgb(135,196,240)',
            'polygonOpacity' : 1,
            'lineColor' : '#1bbc9b',
            'lineWidth' : 6,
            'lineJoin'  : 'round', //miter, round, bevel
            'lineCap'   : 'round', //butt, round, square
            'lineDasharray' : null,//dasharray, e.g. [10, 5, 5]
            'lineOpacity ' : 1
          }
        }
      ).addTo(layer);

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