You're all set!

To start developing, please head over to our developer documentation.

Activate the Google Maps JavaScript API

To get you started we'll guide you through the Google Developers Console to do a few things first:

  1. Create or choose a project
  2. Activate the Google Maps JavaScript API and related services
  3. Create appropriate keys
Continue

Animating Symbols

Read the documentation or view this example full screen.

// 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);
}
<div id="map"></div>
html, body {
  height: 100%;
  margin: 0;
  padding: 0;
}
#map {
  height: 100%;
}
<!-- Replace the value of the key parameter with your own API key. -->
<script async defer
src="https://maps.googleapis.com/maps/api/js?key=AIzaSyCkUOdZ5y7hMm0yrcCQoCvLwzdM6M8s5qk&callback=initMap">
</script>
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 async defer
    src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap">
    </script>
  </body>
</html>

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Google Maps JavaScript API
Google Maps JavaScript API
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