Pinch Events

Pinch events receive the gesture event properties.
译：捏事件手势属性。

1. Events.Pinch — Two pointers moving inwards or outwards. 译：两指针向内或向外移动
2. Events.PinchStart — Start pinching. 译：开始
3. Events.PinchEnd — End of pinching. 译：结束

layerA = new Layer
layerA.pinchable.enabled = true

layerA.on Events.Pinch, ->
    print layerA.scale, layerA.rotation

Pinch Event Shortcuts
译：捏事件的快捷键

# For Events.Pinch 
layerA.onPinch ->
    print "Currently pinching"

# For Events.PinchStart 
layerA.onPinchStart ->
    print "Start pinching"

# For Events.PinchEnd 
layerA.onPinchEnd ->
    print "End pinching"