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demo£º http://6921.ggii.net/swf/ok.swf
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MCÊǼýͷӰƬ¼ô¼­   ʵÀýΪarro
Circle ÊÇÒ»¸öת¶¯µÄÔ°  °´ÏÂÊó±ê,¹Ì¶¨ÔÚ°´Ïµ㴦 ʵÀý circle
´úÂëÊÇÔÚʱ¼äÖáÉÏдµÄ£º
var arro:Sprite= Sprite(new MC());
var circle:MovieClip= MovieClip(new Circle());
arro.name="arro";
circle.name="circle";
stage.addEventListener(MouseEvent.MOUSE_DOWN,onDown,false,1,true);
stage.addEventListener(MouseEvent.MOUSE_UP,onUp,false,1,true);
stage.addEventListener(MouseEvent.MOUSE_MOVE,onMove,false,1,true);
addEventListener(Event.ENTER_FRAME,onFrame,false,1,true);
var tx,ty,gx,gy:int;
var isDown:Boolean;
function onDown(e:MouseEvent) {
 isDown=true;
 tx=e.stageX;
 ty=e.stageY;
 Mouse.hide();
 addChild(circle);
 positionCircle(tx,ty);
}
function onUp(e:MouseEvent) {
 graphics.clear();
 isDown=false;
 Mouse.show();
 if (getChildByName(circle.name)!=null) {
  removeChild(circle);
 }
 if (getChildByName(arro.name)!=null) {
  removeChild(arro);
 }
}
function onMove(e:MouseEvent) {
 gx=e.stageX;
 gy=e.stageY;
 if (isDown) {
  addChild(arro);
  arro.x=gx;
  arro.y=gy;
 }
}
function positionCircle(tx:int,ty:int) {
 circle.x=tx;
 circle.y=ty;
}
function onFrame(e:Event) {
 // ´¦ÀíÊó±êÐýת
 var disX:int=gx-tx;
 var disY:int=gy-ty;
 var angle:Number=Number(Math.atan(disY/disX)*180/Math.PI);// atan·µ»ØµÄÊÇ»¡¶ÈÖµ£¬Òª×ª»»Îª½Ç¶ÈÖµ
 //if (disX == 0) {  ÕâÀï²»ÐèÒª´¦Àí  ÕâµãÊÇÌØÊâµã ¿ÉÒÔºöÂÔ²»¼Æ
 //if(disY>=0){
 //
 //angle=90}else{
 //
 //angle=270
 //
 //
 //
 //}
 //}
 //
 if (disX>0) {
  //do nothing
 }
 if (disX<0) {