1 package com.justinimhoff.multitouch
2 {
3 import flash.events.MouseEvent;
4 import flash.events.TransformGestureEvent;
5 import flash.geom.Matrix;
6 import flash.geom.Point;
7 import flash.ui.Multitouch;
8
9 import mx.controls.Image;
10
11 public class GestureImage extends Image
12 {
13 private var offsetX:Number;
14 private var offsetY:Number;
15
16 public function GestureImage()
17 {
18 if(Multitouch.supportsGestureEvents){
19 this.addEventListener(MouseEvent.MOUSE_DOWN, startDragging);
20 this.addEventListener(MouseEvent.MOUSE_UP, stopDragging);
21 this.addEventListener(TransformGestureEvent.GESTURE_ROTATE,
22 onGestureRotate);
23 this.addEventListener(TransformGestureEvent.GESTURE_ZOOM,
24 onGesturePinch);
25 }
26 }
27
28 private function startDragging(event:MouseEvent):void
29 {
30 setAsCurrentChild();
31 offsetX = event.stageX - this.x;
32 offsetY = event.stageY - this.y;
33 stage.addEventListener(MouseEvent.MOUSE_MOVE, moveImage);
34 }
35
36 private function stopDragging(event:MouseEvent):void
37 {
38 stage.removeEventListener(MouseEvent.MOUSE_MOVE, moveImage);
39 }
40
41 private function moveImage(event:MouseEvent):void
42 {
43 this.x = event.stageX - offsetX;
44 this.y = event.stageY - offsetY;
45 event.updateAfterEvent();
46 }
47
48 private function onGesturePinch(pinchEvent:TransformGestureEvent):void{
49 setAsCurrentChild();
50 var pinchMatrix:Matrix = this.transform.matrix;
51 var pinchPoint:Point =
52 pinchMatrix.transformPoint(
53 new Point((this.width/2), (this.height/2)));
54 pinchMatrix.translate(-pinchPoint.x, -pinchPoint.y);
55 pinchMatrix.scale(pinchEvent.scaleX, pinchEvent.scaleY);
56 pinchMatrix.translate(pinchPoint.x, pinchPoint.y);
57 this.transform.matrix = pinchMatrix;
58 }
59
60 private function onGestureRotate(rotateEvent:TransformGestureEvent):void
61 {
62 setAsCurrentChild();
63 var rotateMatrix:Matrix = this.transform.matrix;
64 var rotatePoint:Point =
65 rotateMatrix.transformPoint(
66 new Point((this.width/2), (this.height/2)));
67 rotateMatrix.translate(-rotatePoint.x, -rotatePoint.y);
68 rotateMatrix.rotate(rotateEvent.rotation*(Math.PI/180));
69 rotateMatrix.translate(rotatePoint.x, rotatePoint.y);
70 this.transform.matrix = rotateMatrix ;
71
72 }
73
74 private function setAsCurrentChild():void{
75 this.parent.setChildIndex( this, this.parent.numChildren-1 );
76 }
77
78 }
79 }
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