Add a canvas source

Add a CanvasSource to the map.

<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>Add a canvas source</title>
<meta name="viewport" content="initial-scale=1,maximum-scale=1,user-scalable=no" />
<script src="https://unpkg.com/[email protected]/dist/maplibre-gl.js"></script>
<link href="https://unpkg.com/[email protected]/dist/maplibre-gl.css" rel="stylesheet" />
<style>
body { margin: 0; padding: 0; }
#map { position: absolute; top: 0; bottom: 0; width: 100%; }
</style>
</head>
<body>
<canvas id="canvasID" width="400" height="400">Canvas not supported</canvas>
<div id="map"></div>
<script>
//Animation from https://javascript.tutorials24x7.com/blog/how-to-draw-animated-circles-in-html5-canvas
var canvas = document.getElementById('canvasID');
var ctx = canvas.getContext('2d');
var circles = [];
var radius = 20;
function Circle(x, y, dx, dy, radius, color) {
this.x = x;
this.y = y;
this.dx = dx;
this.dy = dy;
this.radius = radius;
this.draw = function () {
ctx.beginPath();
ctx.arc(this.x, this.y, this.radius, 0, Math.PI * 2, false);
ctx.strokeStyle = color;
ctx.stroke();
};
this.update = function () {
if (this.x + this.radius > 400 || this.x - this.radius < 0) {
this.dx = -this.dx;
}
if (this.y + this.radius > 400 || this.y - this.radius < 0) {
this.dy = -this.dy;
}
this.x += this.dx;
this.y += this.dy;
this.draw();
};
}
for (var i = 0; i < 5; i++) {
var color =
'#' +
(0x1000000 + Math.random() * 0xffffff).toString(16).substr(1, 6);
var x = Math.random() * (400 - radius * 2) + radius;
var y = Math.random() * (400 - radius * 2) + radius;
var dx = (Math.random() - 0.5) * 2;
var dy = (Math.random() - 0.5) * 2;
circles.push(new Circle(x, y, dx, dy, radius, color));
}
function animate() {
requestAnimationFrame(animate);
ctx.clearRect(0, 0, 400, 400);
for (var r = 0; r < 5; r++) {
circles[r].update();
}
}
animate();
var map = new maplibregl.Map({
container: 'map',
zoom: 5,
minZoom: 4,
center: [95.899147, 18.088694],
style:
'https://api.maptiler.com/maps/streets/style.json?key=get_your_own_OpIi9ZULNHzrESv6T2vL'
});
map.on('load', function () {
map.addSource('canvas-source', {
type: 'canvas',
canvas: 'canvasID',
coordinates: [
[91.4461, 21.5006],
[100.3541, 21.5006],
[100.3541, 13.9706],
[91.4461, 13.9706]
],
// Set to true if the canvas source is animated. If the canvas is static, animate should be set to false to improve performance.
animate: true
});
map.addLayer({
id: 'canvas-layer',
type: 'raster',
source: 'canvas-source'
});
});
</script>
</body>
</html>