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Animating Symbols

This example adds an animated symbol to a polyline.

Read the documentation.

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: "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);
}

CSS

/* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
#map {
  height: 100%;
}

/* Optional: Makes the sample page fill the window. */
html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
}

HTML

<!DOCTYPE html>
<html>
  <head>
    <title>Animating Symbols</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <link rel="stylesheet" type="text/css" href="./style.css" />
    <script src="./app.js"></script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>

All

<!DOCTYPE html>
<html>
  <head>
    <title>Animating Symbols</title>
    <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script>
    <script
      src="https://maps.googleapis.com/maps/api/js?key=YOUR_API_KEY&callback=initMap&libraries=&v=weekly"
      defer
    ></script>
    <style type="text/css">
      /* Always set the map height explicitly to define the size of the div
       * element that contains the map. */
      #map {
        height: 100%;
      }

      /* Optional: Makes the sample page fill the window. */
      html,
      body {
        height: 100%;
        margin: 0;
        padding: 0;
      }
    </style>
    <script>
      (function(exports) {
        "use strict";

        // 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: "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);
        }

        exports.animateCircle = animateCircle;
        exports.initMap = initMap;
      })((this.window = this.window || {}));
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>
(function(exports) { "use strict"; // 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: "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); } exports.animateCircle = animateCircle; exports.initMap = initMap; })((this.window = this.window || {}));
/* Always set the map height explicitly to define the size of the div * element that contains the map. */ #map { height: 100%; } /* Optional: Makes the sample page fill the window. */ html, body { height: 100%; margin: 0; padding: 0; }
<!DOCTYPE html> <html> <head> <title>Animating Symbols</title> <script src="https://polyfill.io/v3/polyfill.min.js?features=default"></script> <script src="https://maps.googleapis.com/maps/api/js?key=&callback=initMap&libraries=&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> </body> </html>