DIR : /home/kozerus/public_html/go/konva2.html

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Konva Drag and Drop Stress Test with 10,000 Shapes Demo
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<!DOCTYPE html>
<html>
  <head>
<!--    <script src="https://unpkg.com/konva@8.3.0/konva.min.js"></script> -->
	<script id=script_konva_js src="/go/js/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 bgcolor=linen>
		<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);
        circle.startDrag();
      });
    </script>
  </body>
</html>
koh5_pano

Drag mouse to navigate.
Navigation

Left/Right Mouse drag: Changes camera heading.
Up/Sown Mouse drag: Changes camera pitch.
Scroll wheel: Changes camera field of view.
I-Key: Displays Info panel with canvas size, image size and FPS.
17.Aug.2010, Martin Wengenmayer