snake_贪吃蛇.java

snake.javaimport java.awt.Color;import java.awt.Graphics;import java.awt.Point;import java.awt.event.KeyAdapter;import java.awt.event.KeyEvent;import java.util.LinkedList;import java.util.Random;import javax.swing.JFrame;import javax.swing.JPanel;import simpleFrame.FrameUtil;import simpleFrame.MyFrame;public class SnakeView extends JPanel {    // 地图的宽和高    public static final int WIDTH = 40;    public static final int HEIGHT = 30;    // 格子的宽和高    public static final int CELLWIDTH = 20;    public static final int CELLHEIGHT = 20;    // 使用四个常量表示四个方向    public static final int UP_DIRECTION = 1; // 上    public static final int DOWN_DIRECTION = -1; // 下    public static final int LEFT_DIRECTION = 2; // 左    public static final int RIGHT_DIRECTION = -2; // 右    // 蛇当前的方向    int currentDrection = -2; // 蛇默认向右行走    // 记录游戏是否结束    static boolean isGameOver = false; // 默认游戏没有结束    // 包含蛇所有节点的信息    LinkedList<Point> snake = new LinkedList<Point>();    // 食物    Point food;    // 地图    public char[][] background = new char[HEIGHT][WIDTH];    // 改变当前方向    public void changeDirection(int newDirection) {        // 判断新方向与当前方向是否是相反方向        if (newDirection + currentDrection != 0) {            this.currentDrection = newDirection;        }    }    // 蛇移动的方法    public void move() {        Point head = snake.getFirst();        // 蛇是根据当前方向移动的        switch (currentDrection) {        case UP_DIRECTION:            snake.addFirst(new Point(head.x, head.y - 1));            break;        case DOWN_DIRECTION:            snake.addFirst(new Point(head.x, head.y + 1));            break;        case LEFT_DIRECTION:            if (head.x == 0) {                snake.addFirst(new Point(WIDTH - 1, head.y));            } else {                snake.addFirst(new Point(head.x - 1, head.y));            }            break;        case RIGHT_DIRECTION:            if (head.x == WIDTH - 1) {                snake.addFirst(new Point(0, head.y));            } else {                snake.addFirst(new Point(head.x + 1, head.y));            }            break;        default:            break;        }        if (eatFood()) {            // 吃到了食物            createFood();        } else {            // 删除蛇尾            snake.removeLast();        }    }    // 初始化地图    public void initBackground() {        for (int rows = 0; rows < background.length; rows++) {            for (int cols = 0; cols < background[rows].length; cols++) {                if (rows == 0 || rows == HEIGHT - 1 || cols == 0                        || cols == WIDTH - 1) {                    background[rows][cols] = '*'; // 打印墙体                } else {                    background[rows][cols] = ' '; // 打印空白                }            }        }    }    // 初始化蛇    public void initSnake() { // 初始化蛇在地图的中间位置        int x = WIDTH / 2;        int y = HEIGHT / 2;        snake.addFirst(new Point(x - 1, y));        snake.addFirst(new Point(x, y));        snake.addFirst(new Point(x + 1, y));    }    // 生成食物    public void createFood() {        // 创建一个随机数对象        Random random = new Random();        while (true) {            int x = random.nextInt(WIDTH); // 0~width-3            int y = random.nextInt(HEIGHT);            if (background[y][x] != '*') {                food = new Point(x, y);                break;            }        }    }    // 吃食物    public boolean eatFood() {        // 获取蛇头        Point head = snake.getFirst();        if (head.equals(food)) {            return true;        }        return false;    }    @Override    public void paint(Graphics g) {        // 画地图        for (int rows = 0; rows < background.length; rows++) {            for (int cols = 0; cols < background[rows].length; cols++) {                if (background[rows][cols] == '*') {                    // 石头                    g.setColor(Color.GRAY);                } else {                    // 地图                    g.setColor(Color.white);                }                g.fill3DRect(cols * CELLWIDTH, rows * CELLHEIGHT, CELLWIDTH,                        CELLHEIGHT, true);            }        }        // 画蛇        // 画出蛇头        Point head = snake.getFirst();        g.setColor(Color.red);        g.fill3DRect(head.x * CELLWIDTH, head.y * CELLHEIGHT, CELLWIDTH,                CELLHEIGHT, true);        // 蛇身        for (int i = 1; i < snake.size(); i++) {            Point body = snake.get(i);            g.setColor(Color.green);            g.fill3DRect(body.x * CELLWIDTH, body.y * CELLHEIGHT, CELLWIDTH,                    CELLHEIGHT, true);        }        // 显示食物        background[food.y][food.x] = '@';        if (background[food.y][food.x] == '@') {            g.setColor(Color.BLUE);            g.fill3DRect(food.x * CELLWIDTH, food.y * CELLHEIGHT, CELLWIDTH,                    CELLHEIGHT, true);        }    }    // 游戏结束的方法    public void isGameOver() {        // 撞墙结束        Point head = snake.getFirst();        if (background[head.y][head.x] == '*') {            isGameOver = true;        }        // 咬到自己        for (int i = 1; i < snake.size(); i++) {            Point body = snake.get(i);            if (head.equals(body)) {                isGameOver = true;            }        }    }    //游戏运行    public void Start() {        JFrame frame = new JFrame("贪吃蛇      @羊羊羊");        JFrame frame2 = new JFrame("游戏结束");        SnakeView snakeView = new SnakeView();        frame.setResizable(false);        snakeView.initBackground();        snakeView.initSnake();        snakeView.createFood();        frame.add(snakeView);        FrameUtil.initFrame(frame, WIDTH * CELLWIDTH + 10, HEIGHT * CELLHEIGHT                + 35);        // 给窗口添加事件监听器        frame.addKeyListener(new KeyAdapter() {            @Override            public void keyPressed(KeyEvent e) {                int code = e.getKeyCode();                switch (code) {                case KeyEvent.VK_UP:                    snakeView.changeDirection(UP_DIRECTION);                    break;                case KeyEvent.VK_DOWN:                    snakeView.changeDirection(DOWN_DIRECTION);                    snakeView.repaint();                    break;                case KeyEvent.VK_LEFT:                    snakeView.changeDirection(LEFT_DIRECTION);                    snakeView.repaint();                    break;                case KeyEvent.VK_RIGHT:                    snakeView.changeDirection(RIGHT_DIRECTION);                    snakeView.repaint();                    break;                default:                    break;                }                snakeView.move();                snakeView.isGameOver(); // 判断游戏是否结束                // 刷新游戏                snakeView.repaint(); // 实际上就是调用paint的方法                if (isGameOver) {                    /*                     * System.out.println("游戏结束"); System.exit(0);                     */                    MyFrame.init(frame2, 300, 200);                }                snakeView.repaint();            }        });    }    //游戏退出    public void Exit(){        System.exit(0);    }    public static void main(String[] args) {        SnakeView snakeView = new SnakeView();        snakeView.Start();    }}FrameUtil.javaimport java.awt.Dimension;import java.awt.Toolkit;import javax.swing.JFrame;//初始化窗口的工具类public class FrameUtil {    public static void initFrame(JFrame frame,int width,int height){        Toolkit toolkit=Toolkit.getDefaultToolkit();  //获取一个与系统相关的工具类对象        //返回屏幕的尺寸        Dimension d=toolkit.getScreenSize();        int x=(int)d.getWidth();        int y=(int)d.getHeight();        frame.setBounds((x-width)/2, (y-height)/2, width, height);        frame.setVisible(true);        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);    }}