JavaScript Maps SDK

Add an animated icon to the map

Add an animated icon to the map that was generated at runtime with the Canvas API. Requires Trimble Maps v3.0.0 or later. 

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <title>Add Image Animated</title>
    <meta name="viewport" content="width=device-width, initial-scale=1" />
    <link rel="stylesheet" href="https://maps-sdk.trimblemaps.com/v4/trimblemaps-4.2.3.css" />
    <script src="https://maps-sdk.trimblemaps.com/v4/trimblemaps-4.2.3.js"></script>
    <style>
      body {
        margin: 0;
        padding: 0;
      }
      html,
      body,
      #map {
        height: 100%;
      }
    </style>
  </head>
  <body>
    <div id="map"></div>
    <script>
      TrimbleMaps.setAPIKey('YOUR_API_KEY_HERE');
        const map = new TrimbleMaps.Map({
        container: 'map',
        zoom: 5,
        style: TrimbleMaps.Common.Style.TRANSPORTATION,
      });

      const size = 200;

      // implementation of StyleImageInterface to draw a pulsing dot icon on the map
      // Search for StyleImageInterface in https://developer.trimblemaps.com/maps-sdk/api/
      const pulsingDot = {
        width: size,
        height: size,
        data: new Uint8Array(size * size * 4),

        // get rendering context for the map canvas when layer is added to the map
        onAdd() {
          const canvas = document.createElement('canvas');
          canvas.width = this.width;
          canvas.height = this.height;
          this.context = canvas.getContext('2d');
        },

        // called once before every frame where the icon will be used
        render() {
          const duration = 1000;
          const t = (performance.now() % duration) / duration;

          const radius = (size / 2) * 0.3;
          const outerRadius = (size / 2) * 0.7 * t + radius;
          const context = this.context;

          // draw outer circle
          context.clearRect(0, 0, this.width, this.height);
          context.beginPath();
          context.arc(
            this.width / 2,
            this.height / 2,
            outerRadius,
            0,
            Math.PI * 2
          );
          context.fillStyle = 'rgba(255, 200, 200,${1 - t})';
          context.fill();

          // draw inner circle
          context.beginPath();
          context.arc(this.width / 2, this.height / 2, radius, 0, Math.PI * 2);
          context.fillStyle = 'rgba(255, 100, 100, 1)';
          context.strokeStyle = 'white';
          context.lineWidth = 2 + 4 * (1 - t);
          context.fill();
          context.stroke();

          // update this image's data with data from the canvas
          this.data = context.getImageData(0, 0, this.width, this.height).data;

          // continuously repaint the map, resulting in the smooth animation of the dot
          map.triggerRepaint();

          // return `true` to let the map know that the image was updated
          return true;
        },
      };

      map.on('load', () => {
        map.addImage('pulsing-dot', pulsingDot, {pixelRatio: 2});

        map.addSource('points', {
          type: 'geojson',
          data: {
            type: 'FeatureCollection',
            features: [
              {
                type: 'Feature',
                geometry: {
                  type: 'Point',
                  coordinates: [0, 0],
                },
              },
            ],
          },
        });
        map.addLayer({
          id: 'points',
          type: 'symbol',
          source: 'points',
          layout: {
            'icon-image': 'pulsing-dot',
          },
        });
      });
    </script>
  </body>
</html>
Last updated June 26, 2025.