DIR : /home/kozerus/public_html/go/konva12.html

/home/kozerus/public_html/go

Konva Animation Stress Test Demo
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<!DOCTYPE html>
<html>
<head>
<!--	<script src="https://unpkg.com/konva@8.3.0/konva.min.js"></script> -->
	<script src="/go/js/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 listening 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({
        listening: 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>

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