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Animating Symbols

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JavaScript
// This example adds an animated symbol to a polyline.

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    center: {lat: 20.291, lng: 153.027},
    zoom: 6,
    mapTypeId: google.maps.MapTypeId.TERRAIN
  });

  // Define the symbol, using one of the predefined paths ('CIRCLE')
  // supplied by the Google Maps JavaScript API.
  var lineSymbol = {
    path: google.maps.SymbolPath.CIRCLE,
    scale: 8,
    strokeColor: '#393'
  };

  // Create the polyline and add the symbol to it via the 'icons' property.
  var line = new google.maps.Polyline({
    path: [{lat: 22.291, lng: 153.027}, {lat: 18.291, lng: 153.027}],
    icons: [{
      icon: lineSymbol,
      offset: '100%'
    }],
    map: map
  });

  animateCircle(line);
}

// Use the DOM setInterval() function to change the offset of the symbol
// at fixed intervals.
function animateCircle(line) {
    var count = 0;
    window.setInterval(function() {
      count = (count + 1) % 200;

      var icons = line.get('icons');
      icons[0].offset = (count / 2) + '%';
      line.set('icons', icons);
  }, 20);
}
JavaScript + HTML
<!DOCTYPE html>
<html>
  <head>
    <meta name="viewport" content="initial-scale=1.0, user-scalable=no">
    <meta charset="utf-8">
    <title>Animating Symbols</title>
    <style>
      html, body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
      #map {
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
// This example adds an animated symbol to a polyline.

function initMap() {
  var map = new google.maps.Map(document.getElementById('map'), {
    center: {lat: 20.291, lng: 153.027},
    zoom: 6,
    mapTypeId: google.maps.MapTypeId.TERRAIN
  });

  // Define the symbol, using one of the predefined paths ('CIRCLE')
  // supplied by the Google Maps JavaScript API.
  var lineSymbol = {
    path: google.maps.SymbolPath.CIRCLE,
    scale: 8,
    strokeColor: '#393'
  };

  // Create the polyline and add the symbol to it via the 'icons' property.
  var line = new google.maps.Polyline({
    path: [{lat: 22.291, lng: 153.027}, {lat: 18.291, lng: 153.027}],
    icons: [{
      icon: lineSymbol,
      offset: '100%'
    }],
    map: map
  });

  animateCircle(line);
}

// Use the DOM setInterval() function to change the offset of the symbol
// at fixed intervals.
function animateCircle(line) {
    var count = 0;
    window.setInterval(function() {
      count = (count + 1) % 200;

      var icons = line.get('icons');
      icons[0].offset = (count / 2) + '%';
      line.set('icons', icons);
  }, 20);
}

    </script>
    <script src="https://maps.googleapis.com/maps/api/js?&callback=initMap&signed_in=true" async defer>
    </script>
  </body>
</html>

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