Drag and Drop Stress Test with 10,000 Shapes

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Konva Drag and Drop Stress Test with 10,000 Shapes 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 Drag and Drop Stress Test with 10,000 Shapes 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 addCircle(layer) {
        var color = colors[colorIndex++];
        if (colorIndex >= colors.length) {
          colorIndex = 0;
        }

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

        layer.add(circle);
      }

      var stage = new Konva.Stage({
        container: 'container',
        width: width,
        height: height
      });

      var dragLayer = new Konva.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 Konva.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.target;
        var layer = circle.getLayer();

        circle.moveTo(dragLayer);
        layer.draw();
        circle.startDrag();
      });
    </script>
  </body>
</html>
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