DIR : /home/kozerus/public_html/go/konva13.html

/home/kozerus/public_html/go

Konva Bunnies Demo view raw

<!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 Jumping Bunnies Demo</title>
	<style>
		body {
			margin: 0;
			padding: 0;
			overflow: hidden;
			background-color: #f0f0f0;
			}

		#counter {
			position: absolute;
			top: 50px;
			background-color: white;
			font-size: 12px;
			}
		</style>
  </head>

  <body>
    <div id="container"></div>
    <div id="counter"></div>
    <script src="https://mrdoob.github.io/stats.js/build/stats.min.js"></script>
    <script defer="defer">
      var lastTime = 0;

      var width = window.innerWidth;
      var height = window.innerHeight;

      var bunnys = [];
      var GRAVITY = 0.75;

      var maxX = width;
      var minX = 0;
      var maxY = height;
      var minY = 0;

      var startBunnyCount = 1000;
      var isAdding = false;
      var count = 0;
      var amount = 10;

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

      var wabbitTexture = new Image();
      wabbitTexture.onload = function () {
        _handleTextureLoaded();
      };
      wabbitTexture.src = 'https://konvajs.org/assets/bunny.png';

      var stats = new Stats();
      document.body.appendChild(stats.domElement);
      stats.domElement.style.position = 'absolute';
      stats.domElement.style.top = '0px';

      window.requestAnimationFrame(update);

      var counter = document.getElementById('counter');

      count = startBunnyCount;
      counter.innerHTML = startBunnyCount + ' BUNNIES';

      stage.on('mousedown', function () {
        isAdding = true;
      });

      stage.on('mouseup', function () {
        isAdding = false;
      });

      document.addEventListener('touchstart', onTouchStart, true);
      document.addEventListener('touchend', onTouchEnd, true);

      function _handleTextureLoaded(event) {
        for (var i = 0; i < startBunnyCount; i++) {
          var bunny = new Konva.Image({
            image: wabbitTexture,
            transformsEnabled: 'position',
            perfectDrawEnabled: false,
            x: 10,
            y: 10,
          });

          bunny.speedX = Math.random() * 10;
          bunny.speedY = Math.random() * 10 - 5;

          bunnys.push(bunny);
          layer.add(bunny);
        }
      }

      function onTouchStart(event) {
        isAdding = true;
      }

      function onTouchEnd(event) {
        isAdding = false;
      }

      function update() {
        stats.begin();
        if (isAdding) {
          for (var i = 0; i < amount; i++) {
            var bunny = new Konva.Image({
              image: wabbitTexture,
              transformsEnabled: 'position',
              perfectDrawEnabled: false,
              x: 0,
              y: 0,
            });
            bunny.speedX = Math.random() * 10;
            bunny.speedY = Math.random() * 10 - 5;
            bunnys.push(bunny);
            layer.add(bunny);

            count++;
          }
          counter.innerHTML = count + ' BUNNIES';
        }

        for (var i = 0; i < bunnys.length; i++) {
          var bunny = bunnys[i];
          var pos = {
            x: bunny.x(),
            y: bunny.y(),
          };
          pos.x = pos.x + bunny.speedX;
          pos.y = pos.y + bunny.speedY;
          bunny.speedY += GRAVITY;
          if (pos.x > maxX - wabbitTexture.width) {
            bunny.speedX *= -1;
            pos.x = maxX - wabbitTexture.width;
          } else if (pos.x < minX) {
            bunny.speedX *= -1;
            pos.x = minX;
          }

          if (pos.y > maxY - wabbitTexture.height) {
            bunny.speedY *= -0.85;
            pos.y = maxY - wabbitTexture.height;
            if (Math.random() > 0.5) {
              bunny.speedY -= Math.random() * 6;
            }
          } else if (pos.y < minY) {
            bunny.speedY = 0;
            pos.y = minY;
          }
          bunny.position({
            x: pos.x,
            y: pos.y,
          });
        }
        requestAnimationFrame(update);
        stats.end();
			}
    </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