（ActionScript 3）儿童和清除屏幕问题

Question

我最近一直在学习 ActionScript 3，在过去的 2 个小时里，我一直坚持这个：

正常使用时无法清屏

while (numChildren)
{
  removeChild(0)
}

我已经设法创建了这个应用程序，它允许我用 WAS 键控制一个绿点（我还没有完成 D 键>_>），但是它留下了痕迹，尽管我尽了最大努力清除屏幕。我来自 Java/C# 背景，所以如果我做错了什么，任何建议都将不胜感激。这是我的代码：

package 
{
import flash.display.DisplayObject;
import flash.display.Sprite;
import flash.display.Shape;
import flash.events.KeyboardEvent;

/**
 * 
 * 
 */
public class Main extends Sprite 
{

    public var Player:EntityPlayer = new EntityPlayer();
    public var EntityDrawList:Array = new Array();
    public var EntityList:Array = new Array();
    public function Main():void 
    {
        addChild(Player.EntityGraphics);
        EntityDrawList.push(Player.EntityGraphics);
        EntityList.push(Player);
        stage.addEventListener(KeyboardEvent.KEY_DOWN, KeyDownEvent);
        UpdateScreen();
    }

    public function KeyDownEvent(Key:KeyboardEvent):void
    {
        if (Key.keyCode == 87)
        {
            Player.YLoc -= Player.EntitySpeed;
            UpdateScreen();
        } else if (Key.keyCode == 65) {
            Player.XLoc += Player.EntitySpeed;
            UpdateScreen();
        } else if (Key.keyCode == 83) {
            Player.YLoc += Player.EntitySpeed;
            UpdateScreen();
        }
    }

    public function UpdateScreen():void
    {

        while (numChildren > 0)
        {
            removeChildAt(0);
        }

        for (var e:int = 0; e < EntityList.length; e++)
        {
            addChild(EntityDrawList[e]);
            EntityList[e].drawEntity();
        }
    }

}

}

我创建了 2 个数组；一个将保存基类，另一个将保存绘图变量（是的，形状。）。可以看到这里显示的类（我只显示实体类，因为 Player 类只包含一个名为 Lives 的变量并扩展了实体类：

package  
{
import flash.display.Shape;
import flash.display.Sprite;
import flash.geom.ColorTransform;
/**
 * ...
 */
public class Entity extends Sprite
{

    public var XLoc:int = 0;
    public var YLoc:int = 0;

    public var EntityWidth:int = 20;
    public var EntityHeight:int = 20;
    public var EntitySize:int = 20;

    public var EntitySpeed:int = 1;

    public var EntityGraphics:Shape = new Shape();

    public var EntityTeam:int = 0;
    /**
     * Teams
     * 0: Player
     * 1: Ally
     * 2: Enemy
     * 3: Neutral
     * 4: Prop
     * 5: Tameable
     */

    public function Entity() 
    {

    }

    public function drawEntity():void
    {
        if (EntityTeam == 0)
        {
            EntityGraphics.graphics.beginFill(0x15FF00, 1);
            EntityGraphics.graphics.drawCircle(XLoc, YLoc, EntitySize);
            EntityGraphics.graphics.endFill();
        } else if (EntityTeam == 1) {
            //EntityGraphics.graphics.beginFill(0x, 1);
            //EntityGraphics.graphics.drawCircle(XLoc, YLoc, EntitySize);
        } else if (EntityTeam == 2) {
            EntityGraphics.graphics.beginFill(0xFF0000, 1);
            EntityGraphics.graphics.drawRect(XLoc, YLoc, EntityWidth, EntityHeight);
            EntityGraphics.graphics.endFill();
        }
    }

    public function eraseEntity():void
    {
        if (EntityTeam == 0)
        {
            EntityGraphics.graphics.beginFill(0xFFFFF, 1);
            EntityGraphics.graphics.drawCircle(XLoc, YLoc, EntitySize);
            EntityGraphics.graphics.endFill();
        } else if (EntityTeam == 1) {
            //EntityGraphics.graphics.beginFill(0x, 1);
            //EntityGraphics.graphics.drawCircle(XLoc, YLoc, EntitySize);
        } else if (EntityTeam == 2) {
            EntityGraphics.graphics.beginFill(0xFFFFFF, 1);
            EntityGraphics.graphics.drawRect(XLoc, YLoc, EntityWidth, EntityHeight);
            EntityGraphics.graphics.endFill();
        }

        drawEntity();
    }

    public function RemoveEntity():void
    {

    }

}

}

如果有更简单的清除屏幕的方法，Google 并不友好地分享它。提前感谢您的帮助:)

Answer 1

尝试使用容器的 removeChildren() 函数。