tools/perf/page_sets/tough_animation_cases/balls_javascript_canvas.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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  18
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  20 "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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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 HTML5 Canvas</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
  69 var canvas;
  70 var context;
  71 var testRunning = true;
  72 var particles = [];
  73 var prevTime;
  74
  75 window.onload = function () {
  76     // Prepare the canvas.
  77     canvas = document.querySelector('canvas');
  78     canvas.width = stageWidth;
  79     canvas.height = stageHeight;
  80     context = canvas.getContext('2d');
  81
  82     // Create the particles
  83     for (var i = 0; i < maxParticles; i++)
  84         particles.push(new Particle());
  85
  86     // Start the animation
  87     prevTime = performance.now();
  88     animate();
  89     measurementReady = true;
  90 }
  91
  92 function animate()
  93 {
  94     var currTime = performance.now();
  95     var timeDelta = currTime - prevTime;
  96
  97     context.clearRect(0, 0, stageWidth, stageHeight);
  98
  99     // Draw each particle
 100     for (var particle in particles)
 101         particles[particle].draw(timeDelta);
 102
 103     prevTime = currTime;
 104
 105     if (testRunning)
 106         requestAnimationFrame(animate);
 107 }
 108
 109 function Particle()
 110 {
 111     var angle = Math.PI * 2 * PerfTestHelper.random();
 112     var velocity = minVelocity + ((maxVelocity - minVelocity) * PerfTestHelper.random());
 113     var x = stageWidth / 2 - particleRadius;
 114     var y = stageHeight / 2 - particleRadius;
 115     var dx = Math.cos(angle) * velocity;
 116     var dy = Math.sin(angle) * velocity;
 117
 118     // Set colour of element
 119     var color = colors[Math.floor(PerfTestHelper.random() * colors.length)];
 120
 121     function draw(timeDelta)
 122     {
 123         var timeDeltaSeconds = timeDelta / 1000;
 124         var testX = x + (dx * timeDeltaSeconds);
 125         var testY = y + (dy * timeDeltaSeconds);
 126
 127         if (testX < 0 || testX > stageWidth) {
 128             dx = -dx;
 129             x += dx;
 130         } else {
 131             x = testX;
 132         }
 133         if (testY < 0 || testY > stageHeight) {
 134             dy = -dy;
 135             y += dy;
 136         } else {
 137             y = testY;
 138         }
 139
 140         context.fillStyle = color;
 141         context.beginPath();
 142         context.arc(x, y, particleRadius, 0, Math.PI * 2);
 143         context.fill();
 144     }
 145
 146     this.draw = draw;
 147 }
 148 </script>
 149 </head>
 150 <canvas></canvas>
 151 </html>