Animate a point

Animate the position of a point by updating a GeoJSON source on each frame.


npm install --save @maptiler/sdk

main.js

import { Map, MapStyle, config } from '@maptiler/sdk';
import '@maptiler/sdk/dist/maptiler-sdk.css';

config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
const map = new Map({
    container: 'map',
    style: MapStyle.STREETS,
    center: [0, 0],
    zoom: 2
});

const radius = 20;

function pointOnCircle(angle) {
    return {
        'type': 'Point',
        'coordinates': [Math.cos(angle) * radius, Math.sin(angle) * radius]
    };
}

map.on('load', function () {
    // Add a source and layer displaying a point which will be animated in a circle.
    map.addSource('point', {
        'type': 'geojson',
        'data': pointOnCircle(0)
    });

    map.addLayer({
        'id': 'point',
        'source': 'point',
        'type': 'circle',
        'paint': {
            'circle-radius': 10,
            'circle-color': '#007cbf'
        }
    });

    function animateMarker(timestamp) {
        // Update the data to a new position based on the animation timestamp. The
        // divisor in the expression `timestamp / 1000` controls the animation speed.
        map.getSource('point').setData(pointOnCircle(timestamp / 1000));

        // Request the next frame of the animation.
        requestAnimationFrame(animateMarker);
    }

    // Start the animation.
    animateMarker(0);
});

index.html

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="robots" content="noindex">
  <title>Animate a point | NPM example | MapTiler SDK JS</title>
  <link rel="stylesheet" href="./style.css">
</head>
<body>
  <div id="map"></div>
  <script type="module" src="./main.js"></script>
</body>
</html>

style.css

body {margin: 0; padding: 0;}
#map {position: absolute; top: 0; bottom: 0; width: 100%;}

<html lang="en">
<head>
<meta charset="UTF-8">
<meta http-equiv="X-UA-Compatible" content="IE=edge">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<title>Animate a point</title>
<script src="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.umd.min.js"></script>
<link href="https://cdn.maptiler.com/maptiler-sdk-js/v4.1.0/maptiler-sdk.css" rel="stylesheet" />
<style>
  body {margin: 0; padding: 0;}
  #map {position: absolute; top: 0; bottom: 0; width: 100%;}
</style>
</head>
<body>
<div id="map"></div>
<script>
    maptilersdk.config.apiKey = 'YOUR_MAPTILER_API_KEY_HERE';
    const map = new maptilersdk.Map({
        container: 'map',
        style: maptilersdk.MapStyle.STREETS,
        center: [0, 0],
        zoom: 2
    });

    const radius = 20;

    function pointOnCircle(angle) {
        return {
            'type': 'Point',
            'coordinates': [Math.cos(angle) * radius, Math.sin(angle) * radius]
        };
    }

    map.on('load', function () {
        // Add a source and layer displaying a point which will be animated in a circle.
        map.addSource('point', {
            'type': 'geojson',
            'data': pointOnCircle(0)
        });

        map.addLayer({
            'id': 'point',
            'source': 'point',
            'type': 'circle',
            'paint': {
                'circle-radius': 10,
                'circle-color': '#007cbf'
            }
        });

        function animateMarker(timestamp) {
            // Update the data to a new position based on the animation timestamp. The
            // divisor in the expression `timestamp / 1000` controls the animation speed.
            map.getSource('point').setData(pointOnCircle(timestamp / 1000));

            // Request the next frame of the animation.
            requestAnimationFrame(animateMarker);
        }

        // Start the animation.
        animateMarker(0);
    });
</script>
</body>
</html>