Area tool to measure area
index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>User Interactions - Area tool to measure area</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: [-0.113049,51.498568],
        zoom: 14,
        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 areaTool = new maptalks.AreaTool({
        'symbol': {
          'lineColor' : '#1bbc9b',
          'lineWidth' : 2,
          'polygonFill' : '#fff',
          'polygonOpacity' : 0.3
        },
        'vertexSymbol' : {
          'markerType'        : 'ellipse',
          'markerFill'        : '#34495e',
          'markerLineColor'   : '#1bbc9b',
          'markerLineWidth'   : 3,
          'markerWidth'       : 10,
          'markerHeight'      : 10
        },
        'labelOptions' : {
          'textSymbol': {
            'textFaceName': 'monospace',
            'textFill' : '#fff',
            'textLineSpacing': 1,
            'textHorizontalAlignment': 'right',
            'textDx': 15
          },
          'boxStyle' : {
            'padding' : [6, 2],
            'symbol' : {
              'markerType' : 'square',
              'markerFill' : '#000',
              'markerFillOpacity' : 0.9,
              'markerLineColor' : '#b4b3b3'
            }
          }
        },
        'clearButtonSymbol' :[{
          'markerType': 'square',
          'markerFill': '#000',
          'markerLineColor': '#b4b3b3',
          'markerLineWidth': 2,
          'markerWidth': 15,
          'markerHeight': 15,
          'markerDx': 22
        }, {
          'markerType': 'x',
          'markerWidth': 10,
          'markerHeight': 10,
          'markerLineColor' : '#fff',
          'markerDx': 22
        }],
        language: ''
      }).addTo(map);

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