J2ME_贪吃蛇

/*
 *以下是MySnakeCanvas.java源码
 */
package com.ming;

import java.util.Random;

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;

/*
 * 一个简单的贪吃蛇小游戏 
 */
public class MySnakeCanvas extends Canvas implements Runnable, CommandListener {
	//蛇身长度
	int snakeSize;
	//蛇身宽度
	int snakeWidth;
	//蛇头坐标
	int snakeHeadX,snakeHeadY;
	//蛇身坐标
	int[] snakeX=new int[100];
	int[] snakeY=new int[100];
	//蛇运动方向
	String fx;
	//间隔时间
	int spaceTime;
	//食物坐标
	int foodX,foodY;
	//分数
	int score;
	//控制游戏的暂停与继续
	boolean isSpace;
	//控制游戏胜负
	boolean isLose=false;
	boolean isWin=false;
	//初始化一个线程
	private Thread thread;
	Command startC=new Command("开始", Command.OK, 1);
	Command spaceC=new Command("暂停", Command.CANCEL, 1);
	Random rdm=new Random();
	
	public MySnakeCanvas(){
		addCommand(startC);
		addCommand(spaceC);
		//添加监听器
		setCommandListener(this);
		initGame();
	}
	//游戏初始化
	public void initGame(){
		score=0;
		snakeSize=5;
		snakeWidth=6;
		snakeHeadX=getWidth()/2;
		snakeHeadY=getHeight()/2-1;
		//暂停时间，根据spaceTime改变游戏难度，spaceTime值越小，蛇的移动速度越快
		spaceTime=300;
		isSpace=true;
		fx="left";
		for (int i = 0; i < snakeSize; i++) {
			snakeX[i]=snakeHeadX+snakeWidth*i;
			snakeY[i]=snakeHeadY;
		}
		getNewFood();
	}
	//获取一个随机食物
	public void getNewFood(){
		do {
			foodX=rdm.nextInt(getWidth()/snakeWidth)*snakeWidth;
			foodY=rdm.nextInt(getHeight()/snakeWidth)*snakeWidth;
		} while (isBadFood());
	}
	
	//判断食物是否符合规定（若食物与蛇身重合则视为违规）
	public boolean isBadFood(){
		for (int i = 0; i < snakeSize; i++) {		
			if (foodX==snakeX[i]&&foodY==snakeY[i]) {
				return true;
			}
		}
		return false;
	}
	//移动蛇的位置
	public void moveSnake(){
		//指定蛇头坐标（将蛇身的第一个节点设为蛇头）
		snakeX[0]=snakeHeadX;
		snakeY[0]=snakeHeadY;
		//蛇身跟随蛇头移动（将蛇蛇身的后一个节点移动到前一个节点的坐标位置）
		for (int i = snakeSize; i >0; i--) {
			snakeX[i]=snakeX[i-1];
			snakeY[i]=snakeY[i-1];
		}
		//移动蛇头
		if (fx=="left") {
			snakeHeadX-=snakeWidth;
		}else if (fx=="right") {
			snakeHeadX+=snakeWidth;
		}else if (fx=="up") {
			snakeHeadY-=snakeWidth;
		}else if (fx=="down") {
			snakeHeadY+=snakeWidth;
		}
		//重新指定蛇头位置
		snakeX[0]=snakeHeadX;
		snakeY[0]=snakeHeadY;
		//测试位置偏差
		//System.out.println("foodX:"+foodX+"*********snakeHeadX:"+snakeHeadX);
		//System.out.println("foodY:"+foodY+"*********snakeHeadY:"+snakeHeadY);
		//System.out.println();
		if (snakeHeadX==foodX&&snakeHeadY==foodY) {
			eatFood();
		}
		if (snakeHeadX>getWidth()||snakeHeadY>getHeight()||snakeHeadX<0||snakeHeadY<0) {
			youLose();
		}
		for (int i = 1; i < snakeSize; i++) {
			if (snakeHeadX==snakeX[i]&&snakeHeadY==snakeY[i]) {
				youLose();
			}
		}
		//过关条件
		if (snakeSize>100) {
			youWin();
		}
		repaint();
	}
	
	public void eatFood(){
		snakeSize++;
		score+=5;
		getNewFood();
		repaint();
	}
	
	
	public void youLose(){
		//提示消息
		System.out.println("you Lose");
		isLose=true;
		isWin=false;
	}
	
	
	public void youWin(){
		//提示消息
		System.out.println("you Win");
		isLose=false;
		isWin=true;
		//进入下一关
	}
	
	
	public void commandAction(Command c, Displayable d) {
		// TODO Auto-generated method stub
		if (c==startC) {
			//开始
			isSpace=false;
			thread=new Thread(this);
			thread.start();
		}else if (c==spaceC) {
			//暂停
			isSpace=true;
		}
	}
	

	public void run() {
		// TODO Auto-generated method stub
		while (!isSpace) {
			moveSnake();
			try {
				//线程暂停
				Thread.sleep(spaceTime);
			} catch (Exception e) {
				// TODO: handle exception
			}
		}
		
	}
	//根据按键操作改变蛇的相对运动方向
	protected void keyPressed(int keyCode) {
		//方向 上 下 左 右
		switch(getGameAction(keyCode)) {
			case Canvas.LEFT: 
				if (fx!="right") {fx="left";}
				break;
			case Canvas.RIGHT: 
				if (fx!="left") {fx="right";}
				break;
			case Canvas.DOWN:
				if (fx!="up") {fx="down";} 
			break;
			case Canvas.UP: 
				if (fx!="down") {fx="up";}
			break;
		}
	}

	protected void paint(Graphics g) {
		// TODO Auto-generated method stub
		//清屏
		g.setColor(0xffffff);
		g.fillRect(0, 0, getWidth(), getHeight());
		g.setColor(0x111111);
		g.fillRect(foodX, foodY, snakeWidth,snakeWidth );
		g.setColor(0x333333);
		for (int i = 0; i < snakeSize ; i++) {
			g.fillRect(snakeX[i], snakeY[i], snakeWidth,snakeWidth );
		}
		if (isLose) {
			//清屏
			g.setColor(0xffffff);
			g.fillRect(0, 0, getWidth(), getHeight());
			g.setColor(0xff00000);
			g.drawString("You Lose!", getWidth()/2, getHeight()/2, Graphics.TOP|Graphics.LEFT);
		}
		if (isWin) {
			//清屏
			g.setColor(0xffffff);
			g.fillRect(0, 0, getWidth(), getHeight());
			g.setColor(0xff00000);
			g.drawString("You Win!", getWidth()/2, getHeight()/2, Graphics.TOP|Graphics.LEFT);
		}
		g.drawString("score:"+score, 10, 10, Graphics.TOP|Graphics.LEFT);
	}
}

//////////////////////////////////////////////////////////////

/*
 *以下是MyAction.java源码
 */
package com.ming;

import javax.microedition.lcdui.Display;
import javax.microedition.midlet.MIDlet;
import javax.microedition.midlet.MIDletStateChangeException;

public class MyAction extends MIDlet {
	Display display;
	protected void destroyApp(boolean arg0) throws MIDletStateChangeException {
		// TODO Auto-generated method stub

	}

	protected void pauseApp() {
		// TODO Auto-generated method stub

	}

	protected void startApp() throws MIDletStateChangeException {
		// TODO Auto-generated method stub
		display=Display.getDisplay(this);
		MySnakeCanvas msc=new MySnakeCanvas();
		display.setCurrent(msc);
	}

}