贪吃蛇代码

package 贪吃蛇;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
 
public class SnakeStart {
	public static void main(String[] args) {
		
		int speed = 0;
		String showInputDialog = null;//初始化时间
		//得到速度
		while(true) {
			showInputDialog = JOptionPane.showInputDialog("蛇移动速度(1 - 5)","3");
			
			if(showInputDialog == null) {
				showInputDialog = "3";//默认速度
				break;
			}
			if(showInputDialog.length() > 1) {
				continue;
			}
			char[] a = showInputDialog.toCharArray();
			if(a[0] >= '1' && a[0] <= '5') {
				break;
			}
		}
			
		speed = Integer.parseInt(showInputDialog) * 50;
		
		
		SnakeJPanel snakeJPanel = new SnakeJPanel(speed);
		
		//创建一个JFrame窗口，将游戏面板添加进行窗口中
		JFrame jFrame = new JFrame();
		//设置窗口的某些属性
		jFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
		jFrame.setSize(920, 750);
	    jFrame.add(snakeJPanel);
	    jFrame.setLocationRelativeTo(null);
	    jFrame.setVisible(true);
	}
 
}

 

package 贪吃蛇;
import java.awt.Color;
import java.awt.EventQueue;
import java.awt.Font;
import java.awt.Frame;
import java.awt.Graphics;
import java.awt.Image;
import java.util.ArrayList;
import java.util.List;
import java.util.Random;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JOptionPane;
import javax.swing.JPanel;
import javax.swing.Timer;
import javax.swing.border.EmptyBorder;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
public class SnakeJPanel extends JPanel implements ActionListener{
	private boolean start;//当前游戏状态
	private int speed;//速度
    private boolean exist;//当前是否存在食物
    private int foodType;//食物种类
    private int x;//豆子的横坐标
    private int y;//豆子的纵坐标
	private ArrayList localList;//蛇
	public String direction;//方向
	private String direction2;//引导方向
	public boolean flag;
	Random rand = new Random();
	private ImageIcon up;
	private ImageIcon down;
	private ImageIcon right;
	private ImageIcon left;
	private ImageIcon body;
	private ImageIcon food;
	private ImageIcon title;
	Timer time;
	private int score;//当前得分情况
	private int num;//吃到的食物个数
//    private Image offScreenImage;  //图形缓存
	
	//图片绘制
	@Override
	public void paint(Graphics g) {
		direction = direction2;
		g.setColor(Color.WHITE);
		g.fillRect(0, 0, 900, 700);
		
		//绘制游戏框
		//标题框
		g.drawRect(25, 30, 800, 75);
		title.paintIcon(this, g, 25, 10);
		//内容框
		g.setColor(Color.black);
		g.fillRect(25, 75, 850, 600);
		//绘制食物的坐标位置
		if(!exist) {//如果当前不存在豆子,随机绘制一个豆子	
			if(num % 5 == 0) {
				foodType = 1;
			}else {
				foodType = 0;
			}
			boolean isProduce = true;
			while(isProduce) {
				isProduce = false;
				x = rand.nextInt(33) * 25 + 25;		
				y = rand.nextInt(23) * 25 + 75;			
				for (int[] arr:localList) {
					if(x == arr[0] && y == arr[1]) {	
						isProduce = true;
						break;	
					}
				}
				
			}			
			System.out.println(x + "---" + y);
		}
		
		 if(eat()) {
	        exist = false;
		 }else {
			exist = true;
		 }
		 
		if(foodType == 0) {
			//绘制食物
			g.setColor(Color.blue);
//			g.fillRect(x, y, 25, 25);
			g.drawImage(food.getImage(),x, y, 25, 25,null);
		}else {
			//绘制食物
			g.setColor(Color.WHITE);
			g.fillRect(x, y, 25, 25);
//			g.drawImage(food.getImage(),x, y, 25, 25,null);
		}
	
		//绘制头
		g.setColor(Color.red);
//		g.fillRect(localList.get(0)[0], localList.get(0)[1], 25, 25);	
		ImageIcon head = null;
		//判断当前方向
		if(direction.equals("R")) {
			 head = right;
		}else if(direction.equals("L")) {
			 head = left;
		}else if(direction.equals("U")) {
			 head = up;
		}else if(direction.equals("D")) {
			 head = down;
		}		
		g.drawImage(head.getImage(), localList.get(0)[0], localList.get(0)[1], 25, 25,null);
		head.paintIcon(this, g,localList.get(0)[0], localList.get(0)[1]);
		
		//绘制身体
		g.setColor(Color.white);
		for (int i = 1; i < localList.size(); i++) {
//			g.fillRect(localList.get(i)[0], localList.get(i)[1], 25, 25);
//			g.drawImage(body.getImage(), localList.get(i)[0], localList.get(i)[1], 25, 25,null);
			body.paintIcon(this, g, localList.get(i)[0], localList.get(i)[1]);
		}
//		g.fillRect(localList.get(1)[0], localList.get(1)[1], 25, 25);
//		g.fillRect(localList.get(2)[0], localList.get(2)[1], 25, 25);
			
		//绘制分数和长度
		//长度
		g.setColor(Color.GREEN);
		g.setFont(new Font("宋体", Font.BOLD, 18));
		g.drawString("长度:" + (localList.size() - 1), 25, 30);
		
		//分数
		g.drawString("分数:" + score, 25, 48);
		
		if(!start) {//如果游戏未启动，结束移动和重绘
			g.setColor(Color.white);
			g.setFont(new Font("宋体", Font.BOLD, 30));
			g.drawString("暂停/开始(请按任意键开始，空格键暂停)", 150, 300);
			time.stop();
		}else {
			time.start();
		}
			
//		speed();
		//移动后进行下一次绘制		
//      move();//移动
//		repaint();//重新绘制		
	}
	
//	//解决闪烁问题
//	//如果为JFrame 为重量级  程序不会调用update()方法
//	//如果为Frame 为轻量级  重写update()方法 做双缓冲
//	//如果为JPanel 不会闪烁
//	  @Override
//	    public void update(Graphics g)
//	    {
//	    	System.out.println("update");
//	           if(offScreenImage == null)
//	              offScreenImage = this.createImage(900, 700);  //新建一个图像缓存空间,这里图像大小为800*600
//	              Graphics gImage = offScreenImage.getGraphics();  //把它的画笔拿过来,给gImage保存着
//	              paint(gImage);                                   //将要画的东西画到图像缓存空间去
//	              g.drawImage(offScreenImage, 0, 0, null);         //然后一次性显示出来
//	    }
	
	@Override
	public void actionPerformed(ActionEvent e) {	    
	    //移动后进行下一次绘制		
        move();//移动
	    repaint();//重新绘制		
		
	}
 
	/**
	 * 绘制速度
	 */
//	private void speed() {
//		try {//按一定速度进行移动
//			Thread.sleep(speed);//控制移动速度
//		} catch (InterruptedException e) {
//			// TODO 自动生成的 catch 块
//			e.printStackTrace();
//		}
//	}
 
	/**
	 * 初始化图片
	 */
	private void drawImage() {
		up = new ImageIcon("src/贪吃蛇/up.png");
		down = new ImageIcon("src/贪吃蛇/down.png");
		right = new ImageIcon("src/贪吃蛇/right.png");
		left = new ImageIcon("src/贪吃蛇/left.png");
		body = new ImageIcon("src/贪吃蛇/body.png");
		food = new ImageIcon("src/贪吃蛇/food.png");
		title = new ImageIcon("src/贪吃蛇/title.jpg");
	}
	
	private boolean eat() {
		if(localList.get(0)[0] == x && localList.get(0)[1] == y) {//如果当前蛇头吃到了豆子
			System.out.println("eat");
			num++;
			if(foodType == 0) {
				score += 10;
			}else {
				score += (rand.nextInt(5) * 10 + 10);
			}
			int last = localList.size() - 1;//蛇尾			
			//在蛇尾后面添加一节身体
			localList.add(new int[] {localList.get(last)[0],localList.get(last)[1]});
			return true;
		}
		return false;
	}
 
	//移动方法
	public void move() {
		//判断是否游戏结束
		if(isbody()) {
			System.out.println("game over");
			start = false;//结束游戏移动
			JOptionPane.showMessageDialog(null,"游戏已结束！");
			time.stop();
			init();		
		}
			
		if(flag && localList != null) {//如果长度不为空且游戏未结束				
			int last = localList.size() - 1;//记录蛇尾
			
			for (int i = last; i > 0; i--) {//从蛇尾开始，每节身体移动到前一节身体的位置上
				localList.set(i,new int[] {localList.get(i - 1)[0],localList.get(i - 1)[1]});
			}
			
			//记录头位置
			int[] local = localList.get(0);
			//判断当前方向,并进行模拟移动，判断是否与边界重合
			if(direction.equals("R")) {
				if(local[0] >= 850) {
					local[0] = 25;
				}else {
					local[0] += 25;
				}
				
			}else if(direction.equals("L")) {
				if(local[0] <= 25) {
					local[0] = 850;
				}else {
					local[0] -= 25;
				}
				
			}else if(direction.equals("U")) {
				
				if(local[1] <= 75) {
					local[1] = 650;
				}else {
					local[1] -= 25;
				}
				
			}else if(direction.equals("D")) {
				if(local[1] >= 650) {
					local[1] = 75;
				}else {
					local[1] += 25;
				}
				
			}			
						
			//更改头的位置
			localList.set(0, local);		
		}	
	}
	
	//判断下一步是否为蛇身
	private boolean isbody() {
		// TODO 自动生成的方法存根
		//记录头位置
		int x = localList.get(0)[0];
		int y = localList.get(0)[1];
 
		//判断当前方向,并进行模拟移动，判断是否与边界重合
		if(direction.equals("R")) {
			x += 25;
		}else if(direction.equals("L")) {
			x -= 25;
		}else if(direction.equals("U")) {
			y -= 25;
		}else if(direction.equals("D")) {
			y += 25;
		}			
		
		for (int i = 1; i < localList.size(); i++) {
			if(localList.get(i)[0] == x && localList.get(i)[1] == y) {
				return true;
			}
		}
		return false;
 
	}
	
//	//判断下一步是否为边界
//	private boolean isborder() {
//		// TODO 自动生成的方法存根
//		//记录头位置
//		// TODO 自动生成的方法存根
//		//记录头位置
//		int x = localList.get(0)[0];
//		int y = localList.get(0)[1];
//
//		//判断当前方向,并进行模拟移动，判断是否与边界重合
//		if(direction.equals("R")) {
//			x += 25;
//		}else if(direction.equals("L")) {
//			x -= 25;
//		}else if(direction.equals("U")) {
//			y -= 25;
//		}else if(direction.equals("D")) {
//			y += 25;
//		}	
//				
//		if(x < 25 || x > (33 * 25 + 25)) {
//			return true;//当x坐标超出边界，则返回true
//		}
//		if(y < 105 || y > (23 * 25 + 105)) {
//			return true;//当y坐标超出边界，则返回true
//		}
//		return false;//蛇头移动后未超出边界，返回false
//		
//	}
 
	/**
	 * Create the frame.
	 */
	public SnakeJPanel(int speed) {
		
		this.speed = speed; //初始化速度
		
		//初始化游戏面板的基本信息
		this.setSize(900, 700);
		this.setLocation(0, 30);
		this.setFocusable(true);
		
		init();//初始化界面
		drawImage();//绘制图片
		moveByKey();//给界面添加一个键盘监听
				
	}
 
	/*
	 * 键盘监听
	 * 通过键盘输入上下左右来控制当前蛇头移动的方向
	 * 先判断当前蛇头方向，再来改变引导方向
	 * 当进行绘制时再修改蛇的方向
	 * 保证不会因为在短时间内快速变换方向导致蛇头逆向转向
	 */
	private void moveByKey() {
		addKeyListener(new KeyAdapter() {
			@Override
			public void keyPressed(KeyEvent e) {
				int key = e.getKeyCode();
				//边界值判断
				switch(key) {
				case 65:
				case 37:{//向左走
					if(!direction.equals("R")) {
						direction2 = "L";
						
					}
					break;
				}				
				case 87:
				case 38:{//向上走
					if(!direction.equals("D")) {
						direction2 = "U";
					}				
					break;
				}				
				case 68:
				case 39:{//向右走
					if(!direction.equals("L")) {
						direction2 = "R";
					}
					break;
				}
				case 83:
				case 40:{//向下走
					if(!direction.equals("U")) {
						direction2 = "D";
					}					
					break;
				}
				case KeyEvent.VK_SPACE:{//如果当前键盘输入为空格
					start = !start;//调整游戏状态
					System.out.println("暂停/开始");
					repaint();//重绘
				}
				}
				
				//任意键开始
				if(!start && key != KeyEvent.VK_SPACE) {//如果当前状态为暂停状态，且键盘输入不是空格
					start = true;
					repaint();//重绘
					
				}				
			}
		});
	}
 
	/**
	 * 初始化游戏基本信息
	 */
	private void init() {
		start = false;
		exist = true;
		direction2 = "U";
		flag = true;
		localList = new ArrayList();
		localList.add(0,new int[] {75,125});//蛇头
		localList.add(1,new int[] {75,150});//蛇身1
		localList.add(2,new int[] {75,175});//蛇身2
		//创建第一个食物的位置
		//通过循环保证当前生成的食物不在身体所在的坐标上
		boolean isProduce = true;
		while(isProduce) {//循环生成食物坐标
		isProduce = false;//结束本次循环
		x = rand.nextInt(33) * 25 + 25;		
		y = rand.nextInt(23) * 25 + 75;			
		for (int[] arr:localList) {//循环遍历蛇头及蛇身的坐标
		if(x == arr[0] && y == arr[1]) {//如果食物坐标和蛇的某一节坐标重合
		isProduce = true;//跳转循环状态，继续下一次食物生成
		break;	
				}
		}
			//蛇身遍历完成，没有重合坐标，结束食物坐标生成					
	}
		time = new Timer(speed, this);
		setLayout(null);
		score = 0;
		num = 0;
		foodType = 0;
	repaint();	
	}
}