HTML5 Canvas KineticJS Drag and Drop Stress Test with 10,000 Shapes

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 addCircle(layer) {
        var color = colors[colorIndex++];
        if(colorIndex >= colors.length) {
          colorIndex = 0;
        }

var randX = Math.random() * stage.getWidth();
        var randY = Math.random() * stage.getHeight();
        var circle = new Kinetic.Circle({
          x: randX,
          y: randY,
          radius: 6,
          fill: color
        });

layer.add(circle);
      }

var stage = new Kinetic.Stage({
        container: 'container',
        width: 578,
        height: 200
      });
      var dragLayer = new Kinetic.Layer();
      var colors = ['red', 'orange', 'yellow', 'green', 'blue', 'cyan', 'purple'];
      var colorIndex = 0;

var layersArr = [];
      /*
       * create 10 layers each containing 1000 shapes to create
       * 10,000 shapes.  This greatly improves performance because
       * only 1,000 shapes will have to be drawn at a time when a
       * circle is removed from a layer rather than all 10,000 shapes.
       * Keep in mind that having too many layers can also slow down performance.
       * I found that using 10 layers each made up of 1,000 shapes performs better
       * than 20 layers with 500 shapes or 5 layers with 2,000 shapes
       */
      for(var i = 0; i < 10; i++) {
        var layer = new Kinetic.Layer();
        layersArr.push(layer);

for(var n = 0; n < 1000; n++) {
          addCircle(layer);
        }

stage.add(layer);
      }
      stage.add(dragLayer);
      
      stage.on('mousedown', function(evt) {
        var circle = evt.targetNode;
        var layer = circle.getLayer();
        
        circle.moveTo(dragLayer);
        layer.draw();
        circle.startDrag();
      });
    </script>
  </body>
</html>

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Modified on April 9th, 2013 by Eric Rowell