Kineticjs:用双指触摸手势旋转图像?

时间:2014-03-07 01:03:59

标签: javascript canvas rotation kineticjs

我想在移动设备上使用Kineticjs以双指旋转手势旋转图像。

显示图像here。基本上就是这个:

<script src="http://d3lp1msu2r81bx.cloudfront.net/kjs/js/lib/kinetic-v5.0.1.min.js"></script>
<script defer="defer">
  var stage = new Kinetic.Stage({
    container: 'container',
    width: 578,
    height: 200
  });
  var layer = new Kinetic.Layer();

  var imageObj = new Image();
  imageObj.onload = function() {
    var yoda = new Kinetic.Image({
      x: 200,
      y: 50,
      image: imageObj,
      width: 106,
      height: 118
    });

    // add the shape to the layer
    layer.add(yoda);

    // add the layer to the stage
    stage.add(layer);
  };
  imageObj.src = 'http://www.html5canvastutorials.com/demos/assets/yoda.jpg';

</script>

可以使用

添加触摸事件
imageObj.on('touchmove', function() {
       // do something
});

如何围绕图像中心用双指触摸手势旋转图像?

1 个答案:

答案 0 :(得分:0)

您可以将HammerJSKineticJS(来自Kinetic v5.1.0)一起用于手势事件:

  var startRotate = 0;
  var hammertime = Hammer(image);
  hammertime.on("transformstart", function(e) {
    startRotate = image.rotation();
  }).on("transform", function(e) {
    image.rotation(startRotate + e.gesture.rotation);
    layer.draw();
  });

Demo