Java实现贪吃蛇（三）

图形界面版本，有BUG

效果如下：

分三个类完成此代码，如下//测试类public class MainDemo {public static void main(String[] args) {SnakeGame snakeGame = new SnakeGame();snakeGame.initGame();snakeGame.controlSnake(snakeGame);new Thread(snakeGame).start();new Thread(new DynamicBarrier(snakeGame)).start();}}//主界面类import 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.JOptionPane;import javax.swing.JPanel;public class SnakeGame extends JPanel implements Runnable {public final static int SNAKELENGTH = 10; //蛇长初始为10public final static int WIDTH = 40; //地图的宽public final static int HEIGHT = 30; //地图的高public final static int CELLLENGTH = 20; //方格边长//四个常量代表四个方向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private boolean background[][];//存储地图private LinkedList<Point> snake;//代表蛇private Point food; //代表食物private int currentDirection; //当前移动方向private JFrame frame;//窗体                                     TODOpublic SnakeGame() {background = new boolean[HEIGHT][WIDTH];snake = new LinkedList<Point>();frame = new JFrame("贪吃蛇");currentDirection = RIGHT_DIRECTION;}public void setBackground(int x, int y, boolean b) {background[y][x] = b;}public JFrame getJFrame() {return frame;}//初始化食物public void initFood() {Random random = new Random();//无限循环随机产生食物while (true) {int x = random.nextInt(WIDTH);int y = random.nextInt(HEIGHT);food = new Point(x, y);if (!background[y][x] && traverseSnake(food)) {break;}}}//遍历蛇的各个节点public boolean traverseSnake(Point food) {for (Point point : snake)if (food.equals(point)) return false; //有节点一样return true; //没有节点一样}//初始化蛇public void initSnake() {//初始化蛇在地图中间位置int x = WIDTH/2;int y = HEIGHT/2;snake.add(new Point(x, y));for (int i = 1; i <= SNAKELENGTH/2; ++i) {snake.addLast(new Point(x-i, y));snake.addFirst(new Point(x+i, y));}}//初始化地图public void initBackground() {for (int row = 0; row < background.length; ++row) {for (int col = 0; col < background[row].length; ++col) {if (row == 0 || row == HEIGHT-1) background[row][col] = true;}}}//蛇移动public void move() {//蛇的移动Point oldHead = snake.get(0);switch (currentDirection) {case UP_DIRECTION:snake.addFirst(new Point(oldHead.x, oldHead.y-1));break;case DOWN_DIRECTION:snake.addFirst(new Point(oldHead.x, oldHead.y+1));break;case LEFT_DIRECTION:if (oldHead.x == 0) //处理向左空间横穿snake.addFirst(new Point(WIDTH-1, oldHead.y));elsesnake.addFirst(new Point(oldHead.x-1, oldHead.y));break;case RIGHT_DIRECTION: //处理向右空间横穿if (oldHead.x == WIDTH-1)snake.addFirst(new Point(0, oldHead.y));elsesnake.addFirst(new Point(oldHead.x+1, oldHead.y));break;default :break;}frame.repaint(); //TODO 每移动一次，窗体重画一次if (eatFood()) { initFood(); }else { snake.removeLast(); } //去掉尾巴那一个格子if (gameOver()) { //每移动完就进行判断JOptionPane.showMessageDialog(frame, "菜鸟，你挂了，+_O", "来自hong的嘲讽", JOptionPane.INFORMATION_MESSAGE);System.exit(0);}}//改变移动方向public void changeDirection(int newDirection) {if (currentDirection + newDirection != 0)currentDirection = newDirection;}//操纵蛇的移动public void controlSnake(SnakeGame snakeGame) {//JFrame frame = new JFrame("贪吃蛇");frame.add(snakeGame);FrameUtil.initFrame(frame, WIDTH*CELLLENGTH+20, HEIGHT*CELLLENGTH+50); //初始化窗体//按钮添加键盘监听事件frame.addKeyListener(new KeyAdapter() {@Overridepublic void keyPressed(KeyEvent e) {int direction = e.getKeyCode(); //获取事件对应的键值switch (direction) {//控制方向case KeyEvent.VK_UP:changeDirection(UP_DIRECTION);break;case KeyEvent.VK_DOWN:changeDirection(DOWN_DIRECTION);break;case KeyEvent.VK_LEFT:changeDirection(LEFT_DIRECTION);break;case KeyEvent.VK_RIGHT:changeDirection(RIGHT_DIRECTION);break;default :break;}move();}});}public boolean eatFood() {//蛇吃食物Point head = snake.get(0);if (head.equals(food)) return true;else return false;}public boolean gameOver() {//判断游戏是否结束Point head = snake.getFirst();//撞石头死亡if (background[head.y][head.x] == true) return true;//咬蛇身死亡for (int i = 1; i < snake.size(); ++i) {Point body = snake.get(i);if (head.equals(body))return true;}return false;}public void initGame() {//初始化游戏initBackground();initSnake();initFood();}public void paint(Graphics g) { //绘图区//地图for (int row = 0; row < HEIGHT; ++row) {for (int col = 0; col < WIDTH; ++col) {if (background[row][col]) {g.setColor(Color.GRAY); //棕色表示障碍}else {g.setColor(Color.WHITE); //白色表示空地}g.fill3DRect(col*CELLLENGTH, row*CELLLENGTH, CELLLENGTH, CELLLENGTH, true);}}//蛇for (int i = 1; i < snake.size(); ++i) {Point body = snake.get(i); //蛇身部分g.setColor(Color.GREEN);g.fill3DRect(body.x*CELLLENGTH, body.y*CELLLENGTH, CELLLENGTH, CELLLENGTH, true);}Point head = snake.get(0); //蛇头部分g.setColor(Color.RED);g.fill3DRect(head.x*CELLLENGTH, head.y*CELLLENGTH, CELLLENGTH, CELLLENGTH, true);//食物g.setColor(Color.YELLOW);g.fill3DRect(food.x*CELLLENGTH, food.y*CELLLENGTH, CELLLENGTH, CELLLENGTH, true);}@Overridepublic void run() { //多线程实现自动前进while (!gameOver()) {try {Thread.sleep(100);move();} catch (InterruptedException e) {e.printStackTrace();}}}}//障碍物类import java.util.Random;public class DynamicBarrier implements Runnable { //障碍物类 //每8秒生成障碍private Random random;private int amount;private SnakeGame snakeGame;DynamicBarrier() {random = new Random();amount = random.nextInt(10) + 1;}DynamicBarrier(SnakeGame snakeGame) {this();this.snakeGame = snakeGame;}public void run() {while (true) {try {Thread.sleep(8000);} catch (InterruptedException e) {e.printStackTrace();}for (int i = 0; i < amount; ++i) {int x = random.nextInt(SnakeGame.WIDTH);int y = random.nextInt(SnakeGame.HEIGHT);snakeGame.setBackground(x, y, true);snakeGame.getJFrame().repaint();//System.out.println(x + ": "+ y);}}}}

主要用到的知识点就是多线程和swing