催眠图形 - 简书

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        body {
            overflow: hidden
        }
    </style>
</head>
<body>
    <canvas></canvas>
</body>
</html>

 var canvas = document.querySelector('canvas'),
        ctx = canvas.getContext('2d');

    canvas.width = window.innerWidth;
    canvas.height = window.innerWidth;

    ctx.lineWidth = 1;
    ctx.strokeStyle = 'black';
    var time = 0;

    function draw() {
        time += 0.01;
        ctx.clearRect(0, 0, window.innerWidth, window.innerHeight);
        ctx.beginPath();
        for (i = 120; i--;)
            ctx.ellipse(window.innerWidth / 2, window.innerHeight / 2, i * 2, 100 * Math.sin(time + i / 50) + 100, 2 * Math.sin(time / 4) + i * 2, time, 6 + time)
        ctx.stroke();
        requestAnimationFrame(arguments.callee);
    }

    draw();