Javascript math animation

by Daman Daman

CSS

html { background: #000; }

JavaScript

// example code from mr doob : http://mrdoob.com/lab/javascript/requestanimationframe/

var canvas, context, toggle;

init();
animate();

function init() {
    canvas = document.createElement( 'canvas' );
    canvas.width = 512;
    canvas.height = 512;
    context = canvas.getContext( '2d' );
    document.body.appendChild( canvas );
}

function animate() {
    requestAnimationFrame( animate );
    draw();
}

function draw() {
    var time = new Date().getTime() * 0.002;
    var x = Math.sin( time ) * 192 + 256;
    var y = Math.cos( time * 0.9 ) * 192 + 256;
    toggle = !toggle;

    context.fillStyle = toggle ? 'rgb(200,200,20)' :  'rgb(20,20,200)';
    context.beginPath();
    context.arc( x, y, 10, 0, Math.PI * 2, true );
    context.closePath();
    context.fill();
}