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Animating Symbols

This example adds an animated symbol to a polyline.

Read the documentation.

TypeScript

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

function initMap(): void {
  const map = new google.maps.Map(
    document.getElementById("map") as HTMLElement,
    {
      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.
  const lineSymbol = {
    path: google.maps.SymbolPath.CIRCLE,
    scale: 8,
    strokeColor: "#393"
  };

  // Create the polyline and add the symbol to it via the 'icons' property.
  const 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: google.maps.Polyline) {
  let count = 0;
  window.setInterval(() => {
    count = (count + 1) % 200;

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

JavaScript

// This example adds an animated symbol to a polyline.
function initMap() {
  const 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.
  const lineSymbol = {
    path: google.maps.SymbolPath.CIRCLE,
    scale: 8,
    strokeColor: "#393"
  };
  // Create the polyline and add the symbol to it via the 'icons' property.
  const 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) {
  let count = 0;
  window.setInterval(() => {
    count = (count + 1) % 200;
    const 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>
      "use strict";

      // This example adds an animated symbol to a polyline.
      function initMap() {
        const 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.

        const lineSymbol = {
          path: google.maps.SymbolPath.CIRCLE,
          scale: 8,
          strokeColor: "#393"
        }; // Create the polyline and add the symbol to it via the 'icons' property.

        const 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) {
        let count = 0;
        window.setInterval(() => {
          count = (count + 1) % 200;
          const icons = line.get("icons");
          icons[0].offset = count / 2 + "%";
          line.set("icons", icons);
        }, 20);
      }
    </script>
  </head>
  <body>
    <div id="map"></div>
  </body>
</html>
"use strict"; // This example adds an animated symbol to a polyline. function initMap() { const 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. const lineSymbol = { path: google.maps.SymbolPath.CIRCLE, scale: 8, strokeColor: "#393" }; // Create the polyline and add the symbol to it via the 'icons' property. const 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) { let count = 0; window.setInterval(() => { count = (count + 1) % 200; const icons = line.get("icons"); icons[0].offset = count / 2 + "%"; line.set("icons", icons); }, 20); }
/* 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=AIzaSyBIwzALxUPNbatRBj3Xi1Uhp0fFzwWNBkE&callback=initMap&libraries=&v=weekly" defer ></script> <!-- jsFiddle will insert css and js --> </head> <body> <div id="map"></div> </body> </html>

Create a starter application from sample

A skeleton starter application using TypeScript, Webpack, and Babel can be generated from this sample using one of the methods below.

Run Locally

Node.js is required to run this sample locally. Follow these instructions to install Node.js and NPM.

npm i -g '@googlemaps/js-samples'
googlemaps-js-samples init overlay-symbol-animate DESTINATION_FOLDER

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