Rotate camera¶

VietMapGL supports rotating the camera around a point.
Example¶

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Animate map camera around a point</title>
    <meta property="og:description" content="Animate the map camera around a point." />
    <meta charset='utf-8'>
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <script src='https://unpkg.com/@vietmap/vietmap-gl-js@4.2.0/vietmap-gl.js'></script>
     <link rel='stylesheet' href='https://unpkg.com/@vietmap/vietmap-gl-js@4.2.0/vietmap-gl.css' />  
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
    </style>
</head>
<body>
<div id="map"></div>
<script>
    const map = new vietmapgl.Map({
        container: "map",
        style:
          "https://maps.vietmap.vn/mt/tm/style.json?apikey=YOUR_API_KEY_HERE",
        center: [ 106.72301001966926,10.796056815909495],
        zoom: 15,
        pitch:60
      });

    function rotateCamera(timestamp) {
        // clamp the rotation between 0 -360 degrees
        // Divide timestamp by 100 to slow rotation to ~10 degrees / sec
        map.rotateTo((timestamp / 100) % 360, {duration: 0});
        // Request the next frame of the animation.
        requestAnimationFrame(rotateCamera);
    }

    map.on('load', () => {
        // Start the animation.
        rotateCamera(0);

        // Add 3d buildings and remove label layers to enhance the map
        const layers = map.getStyle().layers;
        for (let i = 0; i < layers.length; i++) {
            if (layers[i].type === 'symbol' && layers[i].layout['text-field']) {
                // remove text labels
                map.removeLayer(layers[i].id);
            }
        }

        map.addLayer({
            'id': '3d-buildings',
            'source': 'composite',
            'source-layer': 'building',
            'filter': ['==', 'extrude', 'true'],
            'type': 'fill-extrusion',
            'minzoom': 15,
            'paint': {
                'fill-extrusion-color': '#aaa',

                // use an 'interpolate' expression to add a smooth transition effect to the
                // buildings as the user zooms in
                'fill-extrusion-height': [
                    'interpolate',
                    ['linear'],
                    ['zoom'],
                    15,
                    0,
                    15.05,
                    ['get', 'height']
                ],
                'fill-extrusion-base': [
                    'interpolate',
                    ['linear'],
                    ['zoom'],
                    15,
                    0,
                    15.05,
                    ['get', 'min_height']
                ],
                'fill-extrusion-opacity': 0.6
            }
        });
    });
</script>
</body>
</html>