Hoạt hình một điểm đánh dấu

Hoạt hình vị trí của một điểm đánh dấu bằng cách cập nhật vị trí của nó trên mỗi khung hình.
<!DOCTYPE html>
<html lang="en">
<head>
    <title>Animate a marker</title>
    <meta property="og:description" content="Animate the position of a marker by updating its location on each frame." />

    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="https://unpkg.com/[email protected]/dist/trackasia-gl.css" />
    <script src="https://unpkg.com/[email protected]/dist/trackasia-gl.js"></script>
    <style>
        body { margin: 0; padding: 0; }
        html, body, #map { height: 100%; }
    </style>
</head>
<body>
    <div id="map"></div>
<script>
    const map = new trackasiagl.Map({
        container: 'map',
        style: 'https://maps.track-asia.com/styles/v1/streets.json?key=public_key',
        center: [0, 0],
        zoom: 2
    });

    const marker = new trackasiagl.Marker();

    function animateMarker(timestamp) {
        const radius = 20;

        // Update the data to a new position based on the animation timestamp. The
        // divisor in the expression `timestamp / 1000` controls the animation speed.
        marker.setLngLat([
            Math.cos(timestamp / 1000) * radius,
            Math.sin(timestamp / 1000) * radius
        ]);

        // Ensure it's added to the map. This is safe to call if it's already added.
        marker.addTo(map);

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

    // Start the animation.
    requestAnimationFrame(animateMarker);
</script>

</body>
</html>