arrow rotation

這邊有個arrow rotation的範例，簡單易懂。
http://imlab.cs.ncuc.edu.tw/~pie/RotateArrow.swf

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1. package {
2. import flash.display.Sprite;
3. public class Arrow extends Sprite {
4. public function Arrow() {
5. init();
6. }
7. public function init():void {
8. graphics.lineStyle(1, 0, 1);
9. graphics.beginFill(0xffff00);
10. graphics.moveTo(-50, -25);
11. graphics.lineTo(0, -25);
12. graphics.lineTo(0, -50);
13. graphics.lineTo(50, 0);
14. graphics.lineTo(0, 50);
15. graphics.lineTo(0, 25);
16. graphics.lineTo(-50, 25);
17. graphics.lineTo(-50, -25);
18. graphics.endFill();
19. }
20. }
21. }

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1. package {
2. import flash.display.Sprite;
3. import flash.events.Event;
4. public class RotateToMouse extends Sprite {
5. private var arrow:Arrow;
6. public function RotateToMouse() {
7. init();
8. }
9. private function init():void {
10. arrow = new Arrow();
11. addChild(arrow);
12. arrow.x = stage.stageWidth / 2;
13. arrow.y = stage.stageHeight / 2;
14. addEventListener(Event.ENTER_FRAME, onEnterFrame);
15. }
16. public function onEnterFrame(event:Event):void {
17. var dx:Number = mouseX - arrow.x;
18. var dy:Number = mouseY - arrow.y;
19. var radians:Number = Math.atan2(dy, dx);
20. arrow.rotation = radians * 180 / Math.PI;
21. }
22. }
23. }