board.java

Java 2D 游戏开发贪吃蛇,较简单的实现

/*
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 * and open the template in the editor.
 */
package game;

import java.awt.Color;
import java.awt.Font;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.Toolkit;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyAdapter;
import java.awt.event.KeyEvent;
import javax.swing.ImageIcon;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.Timer;

/**
 *
 * @author ibm
 */
public class Board extends JPanel implements ActionListener {

    private Image head;
    private Image ball;
    private Image apple;
    private int dots;
    private final int MAX_DOTS = 1200;
    private int x[] = new int[MAX_DOTS];
    private int y[] = new int[MAX_DOTS];
    private Timer time;
    private final int DELAY = 145;
    private boolean inGame = true;
    private int apple_x;
    private int apple_y;
    private final int WIDTH = 300;
    private final int HEIGHT = 400;
    private boolean up = false;
    private boolean down = false;
    private boolean left = false;
    private boolean right = true;
    private final int SPEED_SNAKE = 10;
    private boolean stop = false;
 //   private JLabel label;
 //   private int scorce=0;

 //   public Board(JLabel lebal) {

    public Board(){
   //     this.label=label;

        this.addKeyListener(new Adapter());

        ImageIcon h = new ImageIcon(this.getClass().getResource("head.png"));
        head = h.getImage();

        System.out.println(head.getWidth(this));

        System.out.println(head.getHeight(this));
        ImageIcon d = new ImageIcon(this.getClass().getResource("dot.png"));
        ball = d.getImage();

        System.out.println(ball.getWidth(this));

        System.out.println(ball.getHeight(this));

        ImageIcon a = new ImageIcon(this.getClass().getResource("apple.png"));
        apple = a.getImage();

        System.out.println(apple.getWidth(this));

        System.out.println(apple.getHeight(this));

        this.setBackground(Color.black);

        this.setFocusable(true);        

        initGame();
    }

    private void Game_Over(Graphics g) {
        String str = "GAME OVER";
        Font mes = new Font(str, Font.BOLD, 30);

        g.setFont(mes);
        g.drawString(str, 70, 180);
    }

    private void LocationApple() {
        int x = (int) (Math.random() * 10);
        apple_x = x * 30;

        int y = (int) (Math.random() * 10);
        apple_y = y * 40;
    }

    private void checkConfilict() {

        if ((x[0] > WIDTH) || (x[0] < 0)) {
            inGame = false;
        }
        if ((y[0] > HEIGHT) || (y[0] < 0)) {
            inGame = false;
        }

        for (int i = dots; i > 0; i--) {
            if ((x[0] == x[i]) && (y[0] == y[i])) {
                inGame = false;
            }
        }

    }

    private void checkapple() {
        if ((x[0] == apple_x) && (y[0] == apple_y)) {
            dots++;
    //        scorce+=10;
     //       label.setText("Score:");
            LocationApple();
        }
    }

    private void initGame() {
        dots = 3;
        for (int i = 0; i < dots; i++) {
            x[i] = 50 - 10 * i;
            y[i] = 50;
        }

        LocationApple();
        time = new Timer(DELAY, this);

        time.start();
    }

    private void move() {

         for (int i = dots; i > 0; i--) {
            x[i] = x[(i - 1)];
            y[i] = y[(i - 1)];
        }

        if (up) {
            y[0] -= SPEED_SNAKE;
        }
        if (down) {
            y[0] += SPEED_SNAKE;
        }
        if (left) {
            x[0] -= SPEED_SNAKE;
        }
        if (right) {
            x[0] += SPEED_SNAKE;
        }

       

    }

    public class Adapter extends KeyAdapter {

        public void keyPressed(KeyEvent e) {

            int key = e.getKeyCode();

            if (key == KeyEvent.VK_SPACE) {
                stop = !stop;
                if (!stop) {
                    time.stop();
                } else {
                    time.start();
                }
            }

            if ((key == KeyEvent.VK_UP) && (!down)) {
                up = true;
                left = right = false;

            }
            if ((key == KeyEvent.VK_DOWN) && (!up)) {
                down = true;
                left = right = false;

            }
            if ((key == KeyEvent.VK_LEFT) && (!right)) {
                left = true;
                up = down = false;

            }
            if ((key == KeyEvent.VK_RIGHT) && (!left)) {
                right = true;
                up = down = false;

            }


        }
    }

    public void actionPerformed(ActionEvent e) {
        if (inGame) {
            checkapple();
            checkConfilict();
            move();
        }
        repaint();
    }

    public void paint(Graphics g) {

        super.paint(g);

        if (inGame) {
            g.drawImage(apple, apple_x, apple_y, this);

            for (int i = 0; i < dots; i++) {
                if (i == 0) {
                    g.drawImage(head, x[i], y[i], this);
                } else {
                    g.drawImage(ball, x[i], y[i], this);
                }
            }
            Toolkit.getDefaultToolkit().sync();
            g.dispose();
        } else {
            Game_Over(g);
        }
    }
}