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LineString's animateShow
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index.html
<!DOCTYPE html>
<html>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <title>Animation - LineString&#x27;s animateShow</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://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>
    <div class="pane"><a href="javascript:replay();">Replay</a></div>

    <script>
      var map = new maptalks.Map('map', {
        center: [-0.113049, 51.498568],
        zoom: 14,
        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 line = new maptalks.LineString([
        [-0.131049, 51.498568],
        [-0.107049, 51.498568],
        [-0.107049, 51.491568]
      ], {
        visible : false,
        arrowStyle : 'classic',
        arrowPlacement : 'vertex-last',
        symbol: {
          'lineColor' : '#1bbc9b',
          'lineWidth' : 6
        }
      });

      new maptalks.VectorLayer('vector', line).addTo(map);

      replay();

      function replay() {
        line.hide();
        //line's animateShow
        line.animateShow({
          duration : 1500,
          easing : 'out'
        }, function (frame) {
          if (frame.state.playState === 'finished') {
            console.log('finished');
          }
        });
      }

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