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Copyright (c) 2012 Cameron Adams. All rights reserved.
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This test is based on code written by Cameron Adams and imported from
  http://themaninblue.com/experiment/AnimationBenchmark/html
-->

<!doctype html>
<head>
<title>Benchmark - Balls Animation using SVG Animations</title>
<style>
html {
    height: 100%;
}

body {
    width: 100%;
    height: 100%;
    overflow: hidden;
    margin: 0;
    padding: 0;
}

span {
    position: absolute;
    width: 12px;
    height: 12px;
    border-radius: 6px;
}
</style>
<script src="../resources/runner.js"></script>
<script src="resources/framerate.js"></script>
<script>
var stageWidth = 600;
var stageHeight = 600;
var maxParticles = 2500;
var minVelocity = 50;
var maxVelocity = 500;
var particleRadius = 6;
var colors = ["#cc0000", "#ffcc00", "#aaff00", "#0099cc", "#194c99", "#661999"];
var animationDuration = 10;

var particles = [];

window.onload = function () {
    svgContainer.setAttribute('width', stageWidth);
    svgContainer.setAttribute('height', stageHeight);

    for (var i = 0; i < maxParticles; i++)
        addParticle();

    PerfTestRunner.prepareToMeasureValuesAsync({done: onCompletedRun, unit: 'fps'});

    startTrackingFrameRate();
}

function addParticle()
{
    var circle = document.createElementNS('http://www.w3.org/2000/svg','circle');
    circle.setAttribute('r', particleRadius);
    circle.setAttribute('fill', colors[Math.floor(Math.random() * colors.length)]);
    addAnimation(circle);
    svgContainer.appendChild(circle);
}

function addAnimation(target) {
    var angle = Math.PI * 2 * PerfTestRunner.random();
    var velocity = minVelocity + ((maxVelocity - minVelocity) * PerfTestRunner.random());
    var x = stageWidth / 2 - particleRadius;
    var y = stageHeight / 2 - particleRadius;
    var dx = Math.cos(angle) * velocity;
    var dy = Math.sin(angle) * velocity;
    var prevX = x;
    var prevY = y;

    function detectCollision(lineX, normalX, lineY, normalY) {
        var dtx = Infinity;
        var dty = Infinity;
        if (dx * normalX < 0)
            dtx = (lineX - x) / dx;
        if (dy * normalY < 0)
            dty = (lineY - y) / dy;
        var dt = Math.min(dtx, dty);
        var hitX = (dtx < dty);
        return {
            dt: dt,
            x: hitX ? lineX : x + (dx * dt),
            y: hitX ? y + (dy * dt) : lineY,
            dx: hitX ? -dx : dx,
            dy: hitX ? dy : -dy,
        };
    }

    var t = 0;
    var prevT = t;
    while (t < animationDuration) {
        var collisionA = detectCollision(0, 1, 0, 1);
        var collisionB = detectCollision(stageWidth, -1, stageHeight, -1);
        var collision = collisionA.dt < collisionB.dt ? collisionA : collisionB;
        if (t + collision.dt > animationDuration) {
            var dt = animationDuration - t;
            t = animationDuration;
            x += dx * dt;
            y += dy * dt;
        } else {
            t += collision.dt;
            x = collision.x;
            y = collision.y;
            dx = collision.dx;
            dy = collision.dy;
        }
        target.appendChild(generateTransition(prevT, prevX, prevY, t, x, y));
        prevX = x;
        prevY = y;
        prevT = t;
    }
    if (target.lastChild) {
        target.lastChild.setAttribute('repeatCount', '1000');
    }
}

function generateTransition(prevT, prevX, prevY, t, x, y) {
    var animation = document.createElementNS('http://www.w3.org/2000/svg','animateTransform');
    animation.setAttribute('attributeName', 'transform');
    animation.setAttribute('attributeType', 'xml');
    animation.setAttribute('type', 'translate' );
    animation.setAttribute('from', prevX + ' ' + prevY);
    animation.setAttribute('to', x + ' ' + y);
    animation.setAttribute('begin', prevT + 's');
    animation.setAttribute('dur', (t - prevT) + 's');
    return animation;
}


function onCompletedRun() {
    stopTrackingFrameRate();
    svgContainer.remove();
}
</script>
</head>
<svg ns="http://www.w3.org/2000/svg" version="1.1" id="svgContainer"></svg>
</html>