flash绕中心点旋转（支持多次旋转）
package {import flash.events.Event;import flash.geom.Matrix;import flash.geom.Point;import flash.display.*;/** * ... * @author ongsh */public class Main extends Sprite {public function Main():void {if (stage) init();else addEventListener(Event.ADDED_TO_STAGE, init);}private function init(e:Event = null):void {removeEventListener(Event.ADDED_TO_STAGE, init);// entry pointvar s1:Shape = new Shape();s1.graphics.lineStyle(0);s1.graphics.beginFill(0);s1.graphics.drawRect(0, 0, 100, 100);s1.graphics.endFill();s1.x = 200;s1.y = 200;addChild(s1);var s2:Shape = new Shape();s2.graphics.lineStyle(0);s2.graphics.beginFill(0xff0000);s2.graphics.drawRect(0, 0, 100, 100);s2.graphics.endFill();s2.x = s1.x;s2.y = s1.y;addChild(s2);var angle:Number = 45;centerRotate(s2, angle);centerRotate(s1, 10);centerRotate(s2, 60);}/** * 绕中心点旋转 * * @parammc元件 * @paramangle角度 */public function centerRotate(mc:DisplayObject,angle:Number):void {var currentRotation:Number = mc.rotation;//获取mc不旋转时候的尺寸mc.rotation = 0;var mcWidth:Number = mc.width;var mcHeight:Number = mc.height;mc.rotation = currentRotation;//获取mc当前中心点坐标var pointO:Point = mc.localToGlobal(new Point(mcWidth / 2, mcHeight / 2));//旋转mcmc.rotation = angle;//获取mc旋转后中心点坐标var pointO2:Point = mc.localToGlobal(new Point(mcWidth / 2, mcHeight / 2));//平移到原来中心点Ovar p3:Point = pointO.subtract(pointO2);var matrix:Matrix = mc.transform.matrix;matrix.translate(p3.x, p3.y);mc.transform.matrix = matrix;}}}?