Flash AS3范例:制作随意拖动的四边形

Flash AS3实例:制作随意拖动的四边形
Main：
package {
import as3.Mc;
import flash.display.Sprite;
import flash.events.Event;
/**
  * ...
  * @author ...
  */
public class Main extends Sprite {
  private var line:Sprite;
  private var mcs:Array=[];
  public function Main():void {
   line = new Sprite();
   addChild(line);
   init();
  }
  private function init() {
   for (var i:uint = 0; i<4; i++) {
    var mc = new Mc();
    mc.x=20*Math.random()+20*i;
    mc.y=20*Math.random()+20*i;
    addChild(mc);
    mcs.push(mc);
   
   }
   addEventListener(Event.ENTER_FRAME, f);
  }
  private function f(e:Event) {
   line.graphics.clear();
   line.graphics.lineStyle(1);
   line.graphics.moveTo(mcs[0].x, mcs[0].y);
   for (var i:uint =1; i <4; i++) {
    line.graphics.lineTo(mcs[i].x,mcs[i].y);
   }
   line.graphics.lineTo(mcs[0].x,mcs[0].y);
  }
}
}

Mc：
package as3
{
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;

/**
  * ...
  * @author ...
  */
public class Mc extends Sprite 
{
  public function Mc():void {
   addEventListener(MouseEvent.MOUSE_DOWN, d);
   addEventListener(MouseEvent.MOUSE_UP, u);
  }
  private function d(e:MouseEvent):void{
  e.currentTarget.startDrag();
  }
  private function u(e:MouseEvent):void {
   e.currentTarget.stopDrag();
  }
 
 
}

}




http://flash.loogog.com/a/flashjiaocheng/2010/0813/20_2.html