gamectrl.java

J2ME的一个简单游戏,实现动物躲避从空中掉下来的东西!

package game;


import java.util.Timer;

import javax.microedition.lcdui.Alert;
import javax.microedition.lcdui.AlertType;
import javax.microedition.lcdui.Canvas;
import javax.microedition.lcdui.Command;
import javax.microedition.lcdui.CommandListener;
import javax.microedition.lcdui.Displayable;
import javax.microedition.lcdui.Graphics;
import javax.microedition.lcdui.Image;
import javax.microedition.midlet.MIDletStateChangeException;


public class GameCtrl extends Canvas implements CommandListener{
	private final Command startCommand;
	private final Command quitCommand;
	private final RacingMIDlet midlet;
	private Graphics graph;
	private Timer timer = new Timer();
	private NextFrame nextFrame;

	// 炸弹图象
	public Image bombImage;
       // 背景图象
       public Image bgImage;
	// 恐龙图象
	public Image  animalImage;

	// 屏幕尺寸
	public int width = 0;
	public int height = 0;

	// 恐龙水平位置
	public int animalPos = 0;

	// 炸弹位置
	public int[] bombPosX = {0, 0, 0, 0};
	public int[] bombPosY = {0, 0, 0, 0};

	// 炸弹是否出界
	public boolean[] bombCanUse = {false, false, false, false};

	// 游戏结束标志
	public boolean isGameOver = false;

	// 游戏开始标志
	public boolean isGameRun = false;

	// 游戏积分
	public int score = 0;


	public GameCtrl(RacingMIDlet midlet) {
		super();

		// 保存MIDlet类对象
		this.midlet = midlet;

		// 得到屏幕尺寸
		width = getWidth();
		height = getHeight();

		try	{
                        // 装载背景图象
                       bgImage = Image.createImage("/cv.png");
			// 装载炸弹图象
			bombImage = Image.createImage("/bomb.png");

			// 装载恐龙图象
			animalImage = Image.createImage("/aa.png");
		}catch(Exception e)	{}

		// 添加命令按键
		quitCommand = new Command("退出", Command.EXIT, 2);
		addCommand(quitCommand);

		startCommand = new Command("开始", Command.OK, 1);
		addCommand(startCommand);

		// 侦听按键响应
		setCommandListener(this);
	}


	protected void paint(Graphics g)
        {
               Image fail = null;
		graph = g;
		if (isGameOver == true && isGameRun == true){
			isGameRun = false;
                        try
                        {
                          fail=Image.createImage("/w1.png");
                        }
                        catch(Exception e)
                        {
                        }
			// 显示logo
			Alert result = new Alert("本局积分", String.valueOf(score), fail, AlertType.INFO);

			// 延迟2秒
			result.setTimeout(2000);

			// 显示闪屏界面
			midlet.display.setCurrent(result, this);
			return;
		}

		if (isGameRun == true){
			// 白色清空画布
			graph.setColor(255, 255, 255);
			graph.fillRect(0, 0, width, height);

			// 绘制背景
                        g.drawImage(bgImage,this.getWidth()-30,this.getHeight(),g.HCENTER|g.BOTTOM);
                        // 绘制恐龙
                        g.drawImage(animalImage, animalPos, height-animalImage.getHeight()+5, Graphics.HCENTER | Graphics.VCENTER);

			// 绘制炸弹
			for (int i = 0; i < 4; i++){
				if (bombCanUse[i] == true)
					g.drawImage(bombImage, bombPosX[i], bombPosY[i], Graphics.HCENTER | Graphics.VCENTER);
			}
		}
	}


	public void commandAction(Command arg0, Displayable arg1) {
		if (arg0 == startCommand){
			// 用户开始游戏
			initialize();
		}

		if (arg0 == quitCommand){
			if (isGameRun == true){
				// 结束游戏
				isGameOver = true;
				isGameRun = false;

				// 关闭定时器
				nextFrame.cancel();
			}

			// 用户退出游戏
			try{
				midlet.quit();
			}
			catch(MIDletStateChangeException e){}
		}
	}

	private void initialize() {
		// 初始化数据
		animalPos = width/2;
		score = 0;
		for (int i = 0; i < 4; i++){
			bombPosX[i] = 0;
			bombPosY[i] = 0;
			bombCanUse[i] = false;
		}

		// 白色清空画布
		graph.setColor(255, 255, 255);
		graph.fillRect(0, 0, width, height);
		// 开启定时器
		nextFrame = new NextFrame(this);
		timer.schedule(nextFrame, 300, 300);

		// 重绘屏幕
		isGameOver = false;
		isGameRun = true;
		repaint();
	}

	protected void keyPressed(int keyCode) {
		// 游戏结束后不处理按键
		if (isGameOver == true)
                    return;

		// 得到按键动作
		int gameAction = getGameAction(keyCode);
		switch (gameAction) {
		case RIGHT:
			// 右移恐龙
			animalPos += 5;

			// 防止越界
			if (animalPos > width - animalImage.getWidth() / 2)
				animalPos = width - animalImage.getWidth() / 2;
			break;

		case LEFT:
			// 左移恐龙
			animalPos -= 5;

			// 防止越界
			if (animalPos < animalImage.getWidth() / 2)
				animalPos = animalImage.getWidth() / 2;
			break;

		default:
			break;
		}

		// 重绘屏幕
		repaint();
	}

}