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我试图做一个简单的游戏，当球落入某块时，你赢了。用BOX2D杀死不活动的物体？
机制：球通过几个障碍物落下，最后有两个方块，如果球碰到你赢的左方块，下一个关卡将包含更多的块和更少的空间。
测试影片（点击屏幕上砸球）： http://gabrielmeono.com/downloads/Lucky_Hit_Alpha.swf
这些是主要的变量：
var winBox:QuickObject;//You win
var looseBox:QuickObject;//You loose
var gameBall:QuickObject;//Ball dropped
问题
有时候，球将在其中一个障碍物中获得存货并且不会再移动。我可以杀死/从场景中删除这个对象吗？
目前代码：
package {
import flash.display.MovieClip;
import com.actionsnippet.qbox.*;
import flash.events.MouseEvent;
import flash.events.Event;
[SWF(width = 600, height = 600, frameRate = 60)]
public class LuckyHit extends MovieClip {
public var sim:QuickBox2D;
var winBox:QuickObject;
var looseBox:QuickObject;
var gameBall:QuickObject;
var simContacts:QuickContacts;
/**
* Constructor
*/
public function LuckyHit()
{
sim = new QuickBox2D(this);
simContacts = sim.addContactListener();
simContacts.addEventListener(QuickContacts.ADD, contactListener);
//sim.createStageWalls();
winBox = sim.addBox({x:5,y:600/30, width:300/30, height:10/30, density:0});
looseBox = sim.addBox({x:15,y:600/30, width:300/30, height:10/30, density:0});
// make obstacles
for (var i:int = 0; i<(stage.stageWidth/50); i++){
//End
sim.addCircle({x:1 + i * 1.5, y:16, radius:0.1, density:0});
sim.addCircle({x:2 + i * 1.5, y:15, radius:0.1, density:0});
//Mid End
sim.addCircle({x:0 + i * 2, y:14, radius:0.1, density:0});
sim.addCircle({x:0 + i * 2, y:13, radius:0.1, density:0});
sim.addCircle({x:0 + i * 2, y:12, radius:0.1, density:0});
sim.addCircle({x:0 + i * 2, y:11, radius:0.1, density:0});
sim.addCircle({x:0 + i * 2, y:10, radius:0.1, density:0});
//Middle Start
sim.addCircle({x:0 + i * 1.5, y:09, radius:0.1, density:0});
sim.addCircle({x:1 + i * 1.5, y:08, radius:0.1, density:0});
sim.addCircle({x:0 + i * 1.5, y:07, radius:0.1, density:0});
sim.addCircle({x:1 + i * 1.5, y:06, radius:0.1, density:0});
}
sim.start();
stage.addEventListener(MouseEvent.CLICK, _clicked);
}
/**
* ..
* @param e MouseEvent.CLICK
*/
private function _clicked(e:MouseEvent)
{
gameBall = sim.addCircle({x:(mouseX/30), y:(1), radius:0.25, density:5});
}
private function contactListener(e:Event)
{
if (simContacts.isCurrentContact(winBox,gameBall))
{
// Won.
trace ('You won!');
}
}
}
}