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; } }
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