使用双向链表实现贪吃蛇程序
1.链表节点定义:
- package snake;
- public class SnakeNode {
- private int x;
- private int y;
- private SnakeNode next;
- private SnakeNode ahead;
- public SnakeNode() {
- }
- public SnakeNode(int x, int y) {
- super();
- this.x = x;
- this.y = y;
- }
- public int getX() {
- return x;
- }
- public void setX(int x) {
- this.x = x;
- }
- public int getY() {
- return y;
- }
- public void setY(int y) {
- this.y = y;
- }
- public SnakeNode getNext() {
- return next;
- }
- public void setNext(SnakeNode next) {
- this.next = next;
- }
- public SnakeNode getAhead() {
- return ahead;
- }
- public void setAhead(SnakeNode ahead) {
- this.ahead = ahead;
- }
- }
主程序:
- package snake;
- import java.awt.BorderLayout;
- import java.awt.GridLayout;
- import java.awt.KeyEventPostProcessor;
- import java.awt.KeyboardFocusManager;
- import java.awt.event.KeyEvent;
- import java.util.Random;
- import javax.swing.ImageIcon;
- import javax.swing.JFrame;
- import javax.swing.JLabel;
- import javax.swing.JOptionPane;
- import javax.swing.JPanel;
- /**
- * Created by hackcoder on 15-3-11.
- */
- public class Snake extends JFrame {
- private static final int rows = 60;
- private static final int columns = 80;
- // 方向
- private static final int UP = 1;
- private static final int RIGHT = 2;
- private static final int DOWN = 3;
- private static final int LEFT = 4;
- private static int DRIECTION_NOW = RIGHT;
- private static boolean isEat = false;
- private static int TAILX;
- private static int TAILY;
- private static SnakeNode snakeHeader = new SnakeNode();
- private static SnakeNode snakeTailer = snakeHeader;
- private static SnakeNode food = new SnakeNode();
- private static JLabel[] images = new JLabel[rows * columns];
- public static void main(String args[]) {
- snakeHeader.setX(new Random().nextInt(rows - 1));
- snakeHeader.setY(new Random().nextInt(columns - 1));
- Snake snake = new Snake();
- food = getFood();
- while (true) {
- try {
- next();
- // 吃到了食物
- if (food.getX() == snakeHeader.getX()
- && food.getY() == snakeHeader.getY()) {
- addTail();
- isEat = true;
- }
- //吃到食物,重新生成一个食物
- if (isEat) {
- food = getFood();
- }
- // 判断是否结束游戏
- if (judgeEND()) {
- JOptionPane.showMessageDialog(null, "游戏结束!", "游戏结束!",
- JOptionPane.ERROR_MESSAGE);
- break;
- }
- SnakeNode pNow = snakeHeader;
- while (pNow != null) {
- images[columns * pNow.getX() + pNow.getY()]
- .setIcon(new ImageIcon("image/black.jpg", ""));
- pNow = pNow.getNext();
- }
- images[columns * food.getX() + food.getY()]
- .setIcon(new ImageIcon("image/black.jpg", ""));
- Thread.sleep(100);
- // 清理
- pNow = snakeHeader;
- while (pNow != null) {
- images[columns * pNow.getX() + pNow.getY()]
- .setIcon(new ImageIcon("image/white.jpg", ""));
- pNow = pNow.getNext();
- }
- images[columns * food.getX() + food.getY()]
- .setIcon(new ImageIcon("image/white.jpg", ""));
- isEat = false;
- } catch (InterruptedException e) {
- e.printStackTrace();
- }
- }
- }
- public Snake() {
- init();
- this.setBounds(80, 80, 400, 400);
- this.setVisible(true);
- setDefaultCloseOperation(javax.swing.WindowConstants.EXIT_ON_CLOSE);
- // 添加全局键盘监听
- KeyboardFocusManager manager = KeyboardFocusManager
- .getCurrentKeyboardFocusManager();
- manager.addKeyEventPostProcessor((KeyEventPostProcessor) this
- .getMyKeyEventHandler());
- }
- /**
- * 初始化地图
- */
- public void init() {
- JPanel p = new JPanel(new GridLayout(rows, columns, 1, 1));
- setLayout(new BorderLayout());
- for (int x = 0; x < rows; x++) {
- for (int y = 0; y < columns; y++) {
- ImageIcon imageIcon;
- if (x == 0 || x == rows - 1 || y == 0 || y == columns - 1) {
- imageIcon = new ImageIcon("image/red.jpg", "");
- } else {
- imageIcon = new ImageIcon("image/white.jpg", "");
- }
- images[columns * x + y] = new JLabel(imageIcon);
- p.add(images[columns * x + y]);
- }
- }
- getContentPane().add(p, BorderLayout.CENTER);
- }
- /**
- * 键盘监听
- *
- * @return
- */
- public KeyEventPostProcessor getMyKeyEventHandler() {
- return new KeyEventPostProcessor() {
- public boolean postProcessKeyEvent(KeyEvent e) {
- if (e.getID() != KeyEvent.KEY_PRESSED) {
- return false;
- }
- int keycode = e.getKeyCode();
- if (keycode == KeyEvent.VK_UP) {
- if (snakeHeader.getNext() != null) {
- // 判断方向是否可转
- int x1 = snakeHeader.getX();
- int y1 = snakeHeader.getY();
- int x2 = snakeHeader.getNext().getX();
- int y2 = snakeHeader.getNext().getY();
- if (y1 == y2 && x1 - x2 == 1) {
- return true;
- }
- }
- DRIECTION_NOW = UP;
- } else if (keycode == KeyEvent.VK_RIGHT) {
- if (snakeHeader.getNext() != null) {
- int x1 = snakeHeader.getX();
- int y1 = snakeHeader.getY();
- int x2 = snakeHeader.getNext().getX();
- int y2 = snakeHeader.getNext().getY();
- if (x1 == x2 && y2 - y1 == 1) {
- return true;
- }
- }
- DRIECTION_NOW = RIGHT;
- } else if (keycode == KeyEvent.VK_DOWN) {
- if (snakeHeader.getNext() != null) {
- int x1 = snakeHeader.getX();
- int y1 = snakeHeader.getY();
- int x2 = snakeHeader.getNext().getX();
- int y2 = snakeHeader.getNext().getY();
- if (y1 == y2 && x2 - x1 == 1) {
- return true;
- }
- }
- DRIECTION_NOW = DOWN;
- } else if (keycode == KeyEvent.VK_LEFT) {
- if (snakeHeader.getNext() != null) {
- int x1 = snakeHeader.getX();
- int y1 = snakeHeader.getY();
- int x2 = snakeHeader.getNext().getX();
- int y2 = snakeHeader.getNext().getY();
- if (x1 == x2 && y1 - y2 == 1) {
- return true;
- }
- }
- DRIECTION_NOW = LEFT;
- }
- return true;
- }
- };
- }
- /**
- * 计算贪吃蛇的方向及位移
- *
- * @param header
- */
- public static void next() {
- if (snakeHeader == null)
- return;
- TAILX = snakeTailer.getX();
- TAILY = snakeTailer.getY();
- SnakeNode pNow = snakeTailer;
- while (pNow != null) {
- if (pNow == snakeHeader) {
- break;
- }
- pNow.setX(pNow.getAhead().getX());
- pNow.setY(pNow.getAhead().getY());
- pNow = pNow.getAhead();
- }
- if (DRIECTION_NOW == RIGHT) {
- snakeHeader.setY(snakeHeader.getY() + 1);
- } else if (DRIECTION_NOW == LEFT) {
- snakeHeader.setY(snakeHeader.getY() - 1);
- } else if (DRIECTION_NOW == UP) {
- snakeHeader.setX(snakeHeader.getX() - 1);
- } else if (DRIECTION_NOW == DOWN) {
- snakeHeader.setX(snakeHeader.getX() + 1);
- }
- }
- public static void addTail() {
- SnakeNode tail = new SnakeNode(TAILX, TAILY);
- snakeTailer.setNext(tail);
- tail.setAhead(snakeTailer);
- snakeTailer = snakeTailer.getNext();
- }
- public static SnakeNode getFood() {
- SnakeNode food = new SnakeNode();
- boolean flag = true;
- while (true) {
- int x = new Random().nextInt(rows);
- int y = new Random().nextInt(columns);
- if (x == 0 || x == rows - 1 || y == 0 || y == columns - 1) {
- continue;
- }
- SnakeNode pNow = snakeHeader;
- while (pNow != null) {
- if (x == pNow.getX() && y == pNow.getY()) {
- flag = false;
- }
- pNow = pNow.getNext();
- }
- if (flag) {
- food = new SnakeNode(x, y);
- break;
- }
- }
- return food;
- }
- public static boolean judgeEND() {
- //碰墙判断
- if (snakeHeader.getX() == 0 || snakeHeader.getX() == rows - 1
- || snakeHeader.getY() == 0 || snakeHeader.getY() == columns - 1) {
- return true;
- }
- //碰身体判断
- SnakeNode pNow = snakeHeader.getNext();
- while (pNow != null) {
- if (snakeHeader.getX() == pNow.getX()
- && snakeHeader.getY() == pNow.getY()) {
- System.out.println("=========碰到身体===========");
- return true;
- }
- pNow = pNow.getNext();
- }
- return false;
- }
- }