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      1 <!--
      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.
      5 
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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,
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     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 var allParticleKeyframes = [];
     72 
     73 window.onload = function () {
     74     PerfTestRunner.prepareToMeasureValuesAsync({done: onCompletedRun, unit: 'fps'});
     75 
     76     // Create the particles
     77     for (var i = 0; i < maxParticles; i++) {
     78         generateParticleKeyframes(i);
     79         var particle = new Particle(i);
     80         particles.push(particle);
     81     }
     82     for (var i = 0; i < maxParticles; i++)
     83         particles[i].start();
     84 
     85     startTrackingFrameRate();
     86 }
     87 
     88 function generateParticleKeyframes(index) {
     89     allParticleKeyframes[index] = [];
     90 
     91     var angle = Math.PI * 2 * PerfTestRunner.random();
     92     var velocity = minVelocity + ((maxVelocity - minVelocity) * PerfTestRunner.random());
     93     var x = stageWidth / 2 - particleRadius;
     94     var y = stageHeight / 2 - particleRadius;
     95     var dx = Math.cos(angle) * velocity;
     96     var dy = Math.sin(angle) * velocity;
     97 
     98     function detectCollision(lineX, normalX, lineY, normalY) {
     99         var dtx = Infinity;
    100         var dty = Infinity;
    101         if (dx * normalX < 0)
    102             dtx = (lineX - x) / dx;
    103         if (dy * normalY < 0)
    104             dty = (lineY - y) / dy;
    105         var dt = Math.min(dtx, dty);
    106         var hitX = (dtx < dty);
    107         return {
    108             dt: dt,
    109             x: hitX ? lineX : x + (dx * dt),
    110             y: hitX ? y + (dy * dt) : lineY,
    111             dx: hitX ? -dx : dx,
    112             dy: hitX ? dy : -dy,
    113         };
    114     }
    115 
    116     var t = 0;
    117     allParticleKeyframes[index].push(generateKeyframe(0, x, y));
    118     while (t < animationDuration) {
    119         var collisionA = detectCollision(0, 1, 0, 1);
    120         var collisionB = detectCollision(stageWidth, -1, stageHeight, -1);
    121         var collision = collisionA.dt < collisionB.dt ? collisionA : collisionB;
    122         if (t + collision.dt > animationDuration) {
    123             var dt = animationDuration - t;
    124             t = animationDuration;
    125             x += dx * dt;
    126             y += dy * dt;
    127         } else {
    128             t += collision.dt;
    129             x = collision.x;
    130             y = collision.y;
    131             dx = collision.dx;
    132             dy = collision.dy;
    133         }
    134         allParticleKeyframes[index].push(generateKeyframe(t, x, y));
    135     }
    136 
    137     return keyframes;
    138 }
    139 
    140 function generateKeyframe(t, x, y) {
    141     return {left: x + "px", top: y + "px", offset: t / animationDuration };
    142 }
    143 
    144 function Particle(index)
    145 {
    146     // Create visual element for the particle.
    147     var domNode = document.createElement('span');
    148     document.body.appendChild(domNode);
    149 
    150     // Set colour of element.
    151     domNode.style.backgroundColor = colors[Math.floor(Math.random() * colors.length)];
    152 
    153     function start() {
    154         var player = domNode.animate(allParticleKeyframes[index], {easing: "linear", iterations: Infinity, direction: "alternate", duration: animationDuration});
    155     }
    156 
    157     function destroy()
    158     {
    159         document.body.removeChild(domNode);
    160     }
    161 
    162     this.start = start;
    163     this.destroy = destroy;
    164 }
    165 
    166 function onCompletedRun() {
    167     testRunning = false;
    168     stopTrackingFrameRate();
    169 
    170     for (var i = 0; i < particles.length; i++)
    171         particles[i].destroy();
    172     particles = [];
    173 }
    174 </script>
    175 <style id="keyframes"></style>
    176 </head>
    177 </html>
    178