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      2 Copyright (c) 2012 Cameron Adams. All rights reserved.
      3 Copyright (c) 2012 Code Aurora Forum. All rights reserved.
      4 Copyright (C) 2013 Google Inc. All rights reserved.
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     13 in the documentation and/or other materials provided with the
     14 distribution.
     15     * Neither the name of Code Aurora Forum Inc., Google Inc. nor the
     16 names of its contributors may be used to endorse or promote products
     17 derived from this software without specific prior written permission.
     18 
     19 THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     20 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     21 LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     22 A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     23 OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     24 SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     25 LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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     27 THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     28 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     29 OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
     30 
     31 This test is based on code written by Cameron Adams and imported from
     32   http://themaninblue.com/experiment/AnimationBenchmark/html
     33 -->
     34 
     35 <!doctype html>
     36 <head>
     37 <title>Benchmark - Balls Animation using CSS Animations</title>
     38 <style>
     39 html {
     40     height: 100%;
     41 }
     42 
     43 body {
     44     width: 100%;
     45     height: 100%;
     46     overflow: hidden;
     47     margin: 0;
     48     padding: 0;
     49 }
     50 
     51 span {
     52     position: absolute;
     53     width: 12px;
     54     height: 12px;
     55     border-radius: 6px;
     56 }
     57 </style>
     58 <script src="../resources/runner.js"></script>
     59 <script src="resources/framerate.js"></script>
     60 <script>
     61 var stageWidth = 600;
     62 var stageHeight = 600;
     63 var maxParticles = 2500;
     64 var minVelocity = 50;
     65 var maxVelocity = 500;
     66 var particleRadius = 6;
     67 var colors = ["#cc0000", "#ffcc00", "#aaff00", "#0099cc", "#194c99", "#661999"];
     68 var animationDuration = 10;
     69 
     70 var particles = [];
     71 
     72 window.onload = function () {
     73     PerfTestRunner.prepareToMeasureValuesAsync({done: onCompletedRun, unit: 'fps'});
     74 
     75     generateStyleElement();
     76 
     77     // Create the particles
     78     for (var i = 0; i < maxParticles; i++) {
     79         var particle = new Particle(i);
     80         particle.start();
     81         particles.push(particle);
     82     }
     83 
     84     startTrackingFrameRate();
     85 }
     86 
     87 function generateStyleElement() {
     88     var allParticleKeyframes = '';
     89     for (var i = 0; i < maxParticles; i++)
     90         allParticleKeyframes += generateParticleKeyframes(i);
     91     document.querySelector('#keyframes').innerHTML = allParticleKeyframes;
     92 }
     93 
     94 function generateParticleKeyframes(index) {
     95     var keyframes = '@-webkit-keyframes ' + animationNameForIndex(index) + '{\n';
     96 
     97     var angle = Math.PI * 2 * PerfTestRunner.random();
     98     var velocity = minVelocity + ((maxVelocity - minVelocity) * PerfTestRunner.random());
     99     var x = stageWidth / 2 - particleRadius;
    100     var y = stageHeight / 2 - particleRadius;
    101     var dx = Math.cos(angle) * velocity;
    102     var dy = Math.sin(angle) * velocity;
    103 
    104     function detectCollision(lineX, normalX, lineY, normalY) {
    105         var dtx = Infinity;
    106         var dty = Infinity;
    107         if (dx * normalX < 0)
    108             dtx = (lineX - x) / dx;
    109         if (dy * normalY < 0)
    110             dty = (lineY - y) / dy;
    111         var dt = Math.min(dtx, dty);
    112         var hitX = (dtx < dty);
    113         return {
    114             dt: dt,
    115             x: hitX ? lineX : x + (dx * dt),
    116             y: hitX ? y + (dy * dt) : lineY,
    117             dx: hitX ? -dx : dx,
    118             dy: hitX ? dy : -dy,
    119         };
    120     }
    121 
    122     var t = 0;
    123     keyframes += generateKeyframe(0, x, y);
    124     while (t < animationDuration) {
    125         var collisionA = detectCollision(0, 1, 0, 1);
    126         var collisionB = detectCollision(stageWidth, -1, stageHeight, -1);
    127         var collision = collisionA.dt < collisionB.dt ? collisionA : collisionB;
    128         if (t + collision.dt > animationDuration) {
    129             var dt = animationDuration - t;
    130             t = animationDuration;
    131             x += dx * dt;
    132             y += dy * dt;
    133         } else {
    134             t += collision.dt;
    135             x = collision.x;
    136             y = collision.y;
    137             dx = collision.dx;
    138             dy = collision.dy;
    139         }
    140         keyframes += generateKeyframe(t, x, y);
    141     }
    142 
    143     keyframes += '}\n';
    144     return keyframes;
    145 }
    146 
    147 function generateKeyframe(t, x, y) {
    148     return (100 * t / animationDuration) + '% { left: ' + x + 'px; top: ' + y + 'px; }\n';
    149 }
    150 
    151 function animationNameForIndex(index) {
    152     return 'animation-' + index;
    153 }
    154 
    155 function Particle(index)
    156 {
    157     // Create visual element for the particle.
    158     var domNode = document.createElement('span');
    159     document.body.appendChild(domNode);
    160 
    161     // Set colour of element.
    162     domNode.style.backgroundColor = colors[Math.floor(Math.random() * colors.length)];
    163     domNode.style.webkitAnimationTimingFunction = 'linear';
    164     domNode.style.webkitAnimationIterationCount = 'infinite';
    165     domNode.style.webkitAnimationDirection = 'alternate';
    166     domNode.style.webkitAnimationDuration = animationDuration + 's';
    167 
    168     function start() {
    169         domNode.style.webkitAnimationName = animationNameForIndex(index);
    170     }
    171 
    172     function destroy()
    173     {
    174         document.body.removeChild(domNode);
    175     }
    176 
    177     this.start = start;
    178     this.destroy = destroy;
    179 }
    180 
    181 function onCompletedRun() {
    182     testRunning = false;
    183     stopTrackingFrameRate();
    184 
    185     for (var i = 0; i < particles.length; i++)
    186         particles[i].destroy();
    187     particles = [];
    188 }
    189 </script>
    190 <style id="keyframes"></style>
    191 </head>
    192 </html>
    193