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51 lines
1.1 KiB
51 lines
1.1 KiB
3 years ago
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<!-- Licensed under a BSD license. See license.html for license -->
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<!DOCTYPE html>
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<html>
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<head>
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<meta charset="utf-8">
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<meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
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<title>Canvas Random Dots</title>
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</head>
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<body>
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</body>
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<script type="module">
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function main() {
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const ctx = document.createElement('canvas').getContext('2d');
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document.body.appendChild(ctx.canvas);
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ctx.canvas.width = 256;
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ctx.canvas.height = 256;
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ctx.fillStyle = '#FFF';
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ctx.fillRect(0, 0, ctx.canvas.width, ctx.canvas.height);
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function randInt(min, max) {
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if (max === undefined) {
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max = min;
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min = 0;
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}
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return Math.random() * (max - min) + min | 0;
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}
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function drawRandomDot() {
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ctx.fillStyle = `#${randInt(0x1000000).toString(16).padStart(6, '0')}`;
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ctx.beginPath();
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const x = randInt(256);
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const y = randInt(256);
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const radius = randInt(10, 64);
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ctx.arc(x, y, radius, 0, Math.PI * 2);
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ctx.fill();
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}
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function render() {
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drawRandomDot();
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requestAnimationFrame(render);
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}
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requestAnimationFrame(render);
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}
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main();
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</script>
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</html>
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