index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Geometry - Copy a geometry</title>
  <style type="text/css">
    html,body{margin:0px;height:100%;width:100%}
    .container{width:100%;height:100%}
    .pane{background:#34495e;line-height:28px;color:#fff;z-index:10;position:absolute;top:20px;right:20px}
    .pane a{display:block;color:#fff;text-align:left;padding:0 10px;min-width:28px;min-height:28px;float:left}
  </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>
    <div class="pane"><a href="javascript:copy();">Copy</a><a href="javascript:clear();">Clear</a></div>

    <script>
      var map = new maptalks.Map('map', {
        center: [-0.113049,51.49856],
        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 layer = new maptalks.VectorLayer('vector').addTo(map);
      var copyLayer = new maptalks.VectorLayer('copy').addTo(map);

      var rect = new maptalks.Rectangle(
        [-0.121049, 51.50656],
        800, 600,
        {
          'symbol': {
            'lineColor': '#fff',
            'lineWidth': 2,
            'polygonFill': 'rgb(216,115,149)',
            'polygonOpacity': 0.7
          }
        }).addTo(layer);

      var counter = 1;
      function copy() {
        // copy with translation of [0.003, -0.003]
        rect.copy()
        .translate(0.003 * counter, -0.003 * counter)
        .addTo(copyLayer);
        counter++;
      }

      function clear() {
        counter = 1;
        copyLayer.clear();
      }

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