Flex 图片调整(Matrix 矩阵)（放大/放小/左旋转/右旋转/上移/下

转：http://www.voidcn.com/article/p-yiahvwlh-te.html

很不错的例子，很好的讲解了Matrix的使用

<?xml version="1.0" encoding="utf-8"?>
<s:Application xmlns:fx="http://ns.adobe.com/mxml/2009" 
			   xmlns:s="library://ns.adobe.com/flex/spark" 
			   xmlns:mx="library://ns.adobe.com/flex/mx" 
			   creationComplete="initData();" 
			   minWidth="955" minHeight="600">
	<s:layout>
		<s:VerticalLayout/>
	</s:layout>
	<fx:Declarations>
		<!-- 将非可视元素（例如服务、值对象）放在此处 -->
	</fx:Declarations>
	<fx:Script>
		<![CDATA[
			//旋转初始值
			private var rotateDeg:Number=0;
			private function initData():void{
			}
			//旋转
			private function degreesToRadians(degrees:Number):Number { 
				return (degrees * (Math.PI / 180)); 
			} 
			/**
			 * 判断是左旋转还是有旋转
			 * */
			private function button_click(evt:Event):void {
				var direction:int;
				switch (evt.currentTarget) {
					case degreesUp:
						direction = +1;
						break;
					case degreesDown:
						direction = -1;
						break;
				}
				var radians:Number = degreesToRadians(direction);
				var offsetWidth:Number = image2.width / 2;
				var offsetHeight:Number = image2.height / 2;
				var tempMatrix:Matrix = image2.transform.matrix;
				tempMatrix.translate(-offsetWidth,-offsetHeight);
				tempMatrix.rotate(radians);
				tempMatrix.translate(+offsetWidth,+offsetHeight);
				
				image2.transform.matrix = tempMatrix;
				
				rotateDeg = image2.rotation;
			}
			//恢复原装
			private function resetImage():void { 
				var tempMatrix:Matrix = image2.transform.matrix;
				tempMatrix.identity();
				image2.transform.matrix = tempMatrix;
				rotateDeg = image2.rotation;
			} 
			//放大
			private function toBig():void{
				var tempMatrix:Matrix = image2.transform.matrix;
				tempMatrix.scale(1.1,1.1);
				image2.transform.matrix = tempMatrix;
				rotateDeg = image2.rotation;
			}
			//缩小
			private function toSmall():void{
				var tempMatrix:Matrix = image2.transform.matrix;
				tempMatrix. scale(0.9,0.9);
				image2.transform.matrix = tempMatrix;
				rotateDeg = image2.rotation;
				
			}
			//上下左右移动
			//上移
			private function toTop():void{
				var tempMatrix:Matrix = image2.transform.matrix;
				tempMatrix.translate(0,-10);
				image2.transform.matrix = tempMatrix;
				rotateDeg = image2.rotation;
			}
			//下移
			private function toDown():void{
				var tempMatrix:Matrix = image2.transform.matrix;
				tempMatrix.translate(0,10);
				image2.transform.matrix = tempMatrix;
				rotateDeg = image2.rotation;
			}
			//左移
			private function toLeft():void{
				var tempMatrix:Matrix = image2.transform.matrix;
				tempMatrix.translate(-10,0);
				image2.transform.matrix = tempMatrix;
				rotateDeg = image2.rotation;
			}
			//右移
			private function toRight():void{
				var tempMatrix:Matrix = image2.transform.matrix;
				tempMatrix.translate(10,0);
				image2.transform.matrix = tempMatrix;
				rotateDeg = image2.rotation;
			}
			//快照显示
			private function showImage3():void{
				var bd:BitmapData = new BitmapData(g3.width,g3.height);
				var m:Matrix = new Matrix();
				bd.draw(g3,m);
				image3.source=new Bitmap(bd);
			}
		]]>
	</fx:Script>
	<mx:HBox>
		<s:Button label="+" autoRepeat="true" click="toBig();" buttonDown="toBig();"/>
		<s:Button label="-" autoRepeat="true" click="toSmall();" buttonDown="toSmall();"/>
		<s:Button label="↑" autoRepeat="true" click="toTop();" buttonDown="toTop();"/>
		<s:Button label="←" autoRepeat="true" click="toLeft();" buttonDown="toLeft();"/>
		<s:Button label="→" autoRepeat="true" click="toRight();" buttonDown="toRight();"/>
		<s:Button label="↓" autoRepeat="true" click="toDown();" buttonDown="toDown();"/>
		<s:Button label="左旋转" id="degreesUp" autoRepeat="true" click="button_click(event);"
				  buttonDown="button_click(event);" />
		<s:Button label="右旋转" id="degreesDown" autoRepeat="true" click="button_click(event);"
				  buttonDown="button_click(event);"/>
		<s:Button label="Reset" click="resetImage();"/>
	</mx:HBox>
	<mx:Canvas id="g3" width="200" height="200" horizontalScrollPolicy="off" verticalScrollPolicy="off">
		<mx:Image id="image2" 
				  source="assets/p4.jpg" 
				  width="200" 
				  scaleContent="true" 
				  maintainAspectRatio="true" 
				  height="200" /> 
	</mx:Canvas>
	<s:Button label="生成快照" click="showImage3();"/>
	<mx:Image width="200" id="image3" height="200"
			  source="@Embed('assets/photo03.jpg')"/>
</s:Application>