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<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">

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    Copyright (c) 2012 Cameron Adams. All rights reserved.
    Copyright (c) 2012 Code Aurora Forum. All rights reserved.

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        * Redistributions in binary form must reproduce the above
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          contributors may be used to endorse or promote products derived
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    ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS
    BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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    WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
    OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN
    IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

    This test is based on code written by Cameron Adams and imported from
      http://themaninblue.com/experiment/AnimationBenchmark/html
-->

<head>

    <title>Benchmark - HTML &amp; JavaScript</title>

    <meta http-equiv="content-type" content="text/html; charset=UTF-8" />
    <meta name="author" content="The Man in Blue" />
    <meta name="robots" content="all" />
    <meta name="MSSmartTagsPreventParsing" content="true" />
    <meta name="description" content="" />
    <meta name="keywords" content="" />

    <style type="text/css">

    html {
        height: 100%;
    }

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

    span {
        position: absolute;
        width: 12px;
        height: 12px;
        overflow: hidden;
        -webkit-border-radius: 6px;
        -moz-border-radius: 6px;
        border-radius: 6px;
        background-color: #000000;
    }

    .shadows span {
        -webkit-box-shadow: 4px 4px 3px rgba(0,0,0,0.33);
        -moz-box-shadow: 4px 4px 3px rgba(0,0,0,0.33);
        box-shadow: 4px 4px 3px rgba(0,0,0,0.33);
    }

    #frameRate {
        position: absolute;
        right: 10px;
        bottom: 10px;
        z-index: 100;
        font-size: 25px;
        font-family: Arial, Helvetica, sans-serif;
    }

    </style>

    <script type="text/javascript">

    var FRAMES_PER_TIMER_READING = 10;
    var MAX_PARTICLES = 2500;
    var MAX_VELOCITY = 50;
    var PARTICLE_RADIUS = 6;
    var STAGE_WIDTH = 600;
    var STAGE_HEIGHT = 600;
    var COLORS = ["#cc0000", "#ffcc00", "#aaff00", "#0099cc", "#194c99", "#661999"];

    var frameTimes = [];
    var iteration = 0;
    var run = 0;
    var animateIntervalId = 0;
    var statistics = [];
    var frameRates = [];
    var particles = [];

    window.onload = function () {
        PerfTestRunner.prepareToMeasureValuesAsync({done: onCompletedRun, unit: 'fps'});

        // Create the particles
        for (var i = 0; i < MAX_PARTICLES; i++)
            particles.push(new Particle());

        // Start the animation
        animateIntervalId = setInterval(animate, 1);
    }

    function animate()
    {
        var currTime = PerfTestRunner.now();
        var timeDelta = currTime - frameTimes[frameTimes.length - 1];

        if (isNaN(timeDelta))
            timeDelta = 0;

        // Draw each particle
        for (var particle in particles)
            particles[particle].draw(timeDelta);

        if ((iteration++ % FRAMES_PER_TIMER_READING) == 0) {
            // Limit the frame time array to the last 30 frames
            if (frameTimes.length > 30)
                frameTimes.splice(0, 1);

            frameTimes.push(currTime);

            // Calculate the framerate based upon the difference between the absolute times of the oldest and newest frames, subdivided by how many frames were drawn inbetween
            var frameRate = document.getElementById("frameRate");
            var frameRateVal = FRAMES_PER_TIMER_READING * 1000 / ((currTime - frameTimes[0]) / (frameTimes.length - 1));

            if (!isNaN(frameRateVal))
                PerfTestRunner.measureValueAsync(frameRateVal);
        }
    }

    function Particle()
    {
        var angle = Math.PI * 2 * PerfTestRunner.random();
        var velocity = MAX_VELOCITY / 8 * 7 * PerfTestRunner.random() + MAX_VELOCITY / 8;
        var x = STAGE_WIDTH / 2 - PARTICLE_RADIUS;
        var y = STAGE_HEIGHT / 2 - PARTICLE_RADIUS;

        // Create visual element for the particle
        var domNode = document.createElement('span');
        document.body.appendChild(domNode);

        // Set initial position to middle of screen
        domNode.style.left = x + "px";
        domNode.style.top = y + "px";

        // Set colour of element
        domNode.style.backgroundColor = COLORS[Math.floor(Math.random() * COLORS.length)];

        function destroy()
        {
            document.body.removeChild(domNode);
            return;
        }

        function draw(timeDelta)
        {
            // Calculate next position of particle
            var nextX = x + Math.cos(angle) * velocity * (timeDelta / 1000);
            var nextY = y + Math.sin(angle) * velocity * (timeDelta / 1000);

            // If particle is going to move off right side of screen
            if (nextX + PARTICLE_RADIUS * 2 > STAGE_WIDTH)
                // If angle is between 3 o'clock and 6 o'clock
                if ((angle >= 0 && angle < Math.PI / 2))
                    angle = Math.PI - angle;
                // If angle is between 12 o'clock and 3 o'clock
                else if (angle > Math.PI / 2 * 3)
                    angle = angle - (angle - Math.PI / 2 * 3) * 2

            // If particle is going to move off left side of screen
            if (nextX < 0)
                // If angle is between 6 o'clock and 9 o'clock
                if ((angle > Math.PI / 2 && angle < Math.PI))
                    angle = Math.PI - angle;
                // If angle is between 9 o'clock and 12 o'clock
                else if (angle > Math.PI && angle < Math.PI / 2 * 3)
                    angle = angle + (Math.PI / 2 * 3 - angle) * 2

            // If particle is going to move off bottom side of screen
            if (nextY + PARTICLE_RADIUS * 2 > STAGE_HEIGHT)
                // If angle is between 3 o'clock and 9 o'clock
                if ((angle > 0 && angle < Math.PI))
                    angle = Math.PI * 2 - angle;

            // If particle is going to move off top side of screen
            if (nextY < 0)
                // If angle is between 9 o'clock and 3 o'clock
                if ((angle > Math.PI && angle < Math.PI * 2))
                    angle = angle - (angle - Math.PI) * 2;

            domNode.style.left = nextX + "px";
            domNode.style.top = nextY + "px";

            x = nextX;
            y = nextY;
        }

        return { draw: draw, destroy: destroy }
    }

    function onCompletedRun() {
        clearInterval(animateIntervalId);

        for (var particle in particles) {
            var p = particles[particle];
            particles[particle] = 0;
            p.destroy();
        }
        particles = [];

        frameRate.innerHTML = "";
    }
    </script>
    <script src="../resources/runner.js"></script>
</head>

<body>
    <div id="frameRate">
    </div>
</body>

</html>