Animation Stress Test

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Konva Animation Stress Test Demoview raw
<!DOCTYPE html>
<html>
  <head>
    <script src="https://unpkg.com/konva@4.0.18/konva.min.js"></script>
    <meta charset="utf-8" />
    <title>Konva Animation Stress Test Demo</title>
    <style>
      body {
        margin: 0;
        padding: 0;
        overflow: hidden;
        background-color: #f0f0f0;
      }
    </style>
  </head>
  <body>
    <div id="container"></div>
    <script>
      var width = window.innerWidth;
      var height = window.innerHeight;

      function update(layer, frame) {
        var angularSpeed = 100;
        var angularDiff = (angularSpeed * 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 Konva.Stage({
        container: 'container',
        width: width,
        height: height
      });

      /*
       * setting the hitGraphEnabled property to false will improve
       * drawing performance because the rectangles won't have to be
       * drawn onto the hit graph
       */
      var layer = new Konva.Layer({
        hitGraphEnabled: false
      });
      var colors = [
        'red',
        'orange',
        'yellow',
        'green',
        'blue',
        'cyan',
        'purple'
      ];
      var colorIndex = 0;

      for (var i = 0; i < 300; i++) {
        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.width() - 20;
        var randY = Math.random() * stage.height() - 20;

        var box = new Konva.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 Konva.Animation(function(frame) {
        update(layer, frame);
      }, layer);

      anim.start();
    </script>
  </body>
</html>
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