Java游戏 牧羊犬与绵羊

这是一款非常简单的Java游戏，以修正到半截的LGame-Simple-0.2.5开发（也就是LGame-Simple-0.2.5-test版）。
该游戏目前内置有关卡十一关（可配置），以绘制的牧羊犬与绵羊为主要角色，其中牧羊犬将根据玩家鼠标所在位置移动，而绵羊则始终远离牧羊犬，如何利用此一特性，驱赶指定数量绵羊到达指定羊圈中呢？这个，也就是本游戏的游戏目标了。
游戏源码如下：
package org.loon.test;
import java.awt.Color;
import java.awt.Graphics2D;
import java.awt.Transparency;
import java.awt.event.KeyEvent;
import java.awt.event.MouseEvent;
import java.awt.image.BufferedImage;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.StreamTokenizer;
import org.loon.framework.game.simple.GameScene;
import org.loon.framework.game.simple.action.IAction;
import org.loon.framework.game.simple.core.Deploy;
import org.loon.framework.game.simple.core.LSystem;
import org.loon.framework.game.simple.core.LTimer;
import org.loon.framework.game.simple.core.LTimerContext;
import org.loon.framework.game.simple.core.ResourceLoader;
import org.loon.framework.game.simple.core.Screen;
import org.loon.framework.game.simple.utils.GraphicsUtils;
/**
* Copyright 2008 - 2009
*
* Licensed under the Apache License, Version 2.0 (the "License"); you may not
* use this file except in compliance with the License. You may obtain a copy of
* the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
* License for the specific language governing permissions and limitations under
* the License.
*
* @project loonframework
* @author chenpeng
* @email：ceponline@yahoo.com.cn
* @version 0.1
*/
public class Main extends Screen {
private boolean flag;
// 背景色、狗的颜色、羊的颜色
final static private Color bg_c1 = n