tools/perf/page_sets/tough_animation_cases/balls_css_keyframe_animations.html

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