Kineticjs：用双指触摸手势旋转图像？

问题描述

我想在移动设备上使用以双指旋转手势旋转图像。

I want to use Kineticjs on a mobile device to rotate an image with a two finger rotation gesture.

描述显示图像。基本上是这样的：

Displaying an image is described here. Which is basically this:

<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>

添加触摸事件可以用

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？

推荐答案

您可以使用 HammerJS 与 KineticJS （来自Kinetic v5.1.0）用于手势事件：

You can use HammerJS with KineticJS (from Kinetic v5.1.0) for gesture events:

  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();
  });

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