HTML5 Canvas KineticJS Animation Stress Test

Code Editor

<!DOCTYPE HTML>
<html>
  <head>
    <style>
      body {
        margin: 0px;
        padding: 0px;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v4.5.1.min.js"></script>
    <script defer="defer">
      function update(layer, frame) {
        var angularSpeed = 1;
        var angularDiff = angularSpeed * 2 * Math.PI * frame.timeDiff / 1000;
        var shapes = layer.getChildren();

for(var n = 0; n < shapes.length; n++) {
          var shape = shapes[n];
          shape.rotate(angularDiff);
        }
      }
      var stage = new Kinetic.Stage({
        container: 'container',
        width: 578,
        height: 200
      });
      /*
       * setting the listening property to false will improve
       * drawing performance because the rectangles won't have to be
       * drawn onto the hit graph
       */
      var layer = new Kinetic.Layer({
        listening: false
      });
      var colors = ['red', 'orange', 'yellow', 'green', 'blue', 'cyan', 'purple'];
      var colorIndex = 0;

for(var n = 0; n < 300; n++) {( function() {
          var i = n;
          var color = colors[colorIndex++];
          if(colorIndex >= colors.length) {
            colorIndex = 0;
          }

var randWidth = Math.random() * 100 + 20;
          var randHeight = Math.random() * 100 + 20;
          var randX = Math.random() * stage.getWidth() - 20;
          var randY = Math.random() * stage.getHeight() - 20;

var box = new Kinetic.Rect({
            x: randX,
            y: randY,
            offset: {
              x: randWidth / 2,
              y: randHeight / 2
            },
            width: randWidth,
            height: randHeight,
            fill: color,
            stroke: 'black',
            strokeWidth: 4
          });

layer.add(box);
        }());
      }

stage.add(layer);

var anim = new Kinetic.Animation(function(frame) {
        update(layer, frame);
      }, layer);

anim.start();

</script>
  </body>
</html>

< Flash Killer >

More Examples

Modified on January 11th, 2013 by Eric Rowell