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Quellcode

package maxxgame;

import java.awt.Color;
import java.awt.Font;
import java.awt.FontMetrics;
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.JPanel;
import javax.swing.Timer;


public class Board extends JPanel implements ActionListener {

    /**
     * 
     */
    private static final long serialVersionUID = 1L;
    private final int WIDTH = 300;
    private final int HEIGHT = 300;
    private final int DOT_SIZE = 10;
    private final int ALL_DOTS = 900;
    private final int RAND_POS = 29;
    private final int DELAY = 140;
    
    private int x[] = new int[ALL_DOTS];
    private int y[] = new int[ALL_DOTS];
    
    private int dots;
    private int apple_x;
    private int apple_y;
    
    private boolean left = false;
    private boolean right = true;
    private boolean up = false;
    private boolean down = false;
    private boolean inGame = true;
    
    private Timer timer;
    private Image ball;
    private Image apple;
    private Image head;
    
    public Board() {
        addKeyListener(new TAdapter());
        
        setBackground(Color.white);
        
        ImageIcon ii = new ImageIcon(this.getClass().getResource("ball.png"));
        ball = ii.getImage();
        
        ImageIcon iia = new ImageIcon(this.getClass().getResource("apple.png"));
        apple = iia.getImage();
        
        ImageIcon iih = new ImageIcon(this.getClass().getResource("head.png"));
        head = iih.getImage();
        
        setFocusable(true);
        initGame();
        
    }
    
    public void initGame() {
        
        dots = 3;
        
        for (int z = 0; z < dots; z++) {
        
            x[z] = 50 - z+10;
            y[z] = 50;
        
        }
        
        locateApple();
        
        timer = new Timer(DELAY, this);
        timer.start();
    }
    
    public void paint(Graphics g) {
        super.paint(g);
        
        if (inGame) {
            
            g.drawImage(apple,  apple_x, apple_y, this);
            
            for (int z = 0; z < dots; z++) {
                if (z == 0)
                    g.drawImage(head,  x[z], y[z], this);
                else g.drawImage(ball, x[z], y[z], this);
                
            }
        } else {
            gameOver(g);
        }
        
    }

public void gameOver(Graphics g) {
    String msg = "Game Over";
    Font small = new Font("Helvetica", Font.BOLD, 14);
    FontMetrics metr = this.getFontMetrics(small);
    
    g.setColor(Color.white);
    g.setFont(small);
    g.drawString(msg, (WIDTH - metr.stringWidth(msg)) / 2, HEIGHT / 2);
    

}

public void checkApple() { 
    
    if((x[0] == apple_x) && (y[0] == apple_y)) {
        dots++;
        locateApple();
        
    }
}

public void move() {
    
    for (int z = dots; z > 0; z--) {
        x[z] = x[(z - 1)];
        y[z] = y[(z - 1)];
    }
    
    if (left) {
        x[0] -= DOT_SIZE;
    }
    
    if (right) {
        x[0] += DOT_SIZE;
    }
    
    if (up) {
        y[0] -= DOT_SIZE;
    }
    
    if (down) {
        y[0] += DOT_SIZE;
    }
}


public void checkCollision() {
    
    for (int z = dots; z > 0; z--) {
        
        if ((z > 4) && (x[0] == x[z]) && (y[0] == y[z])) {
            inGame = false;
        }
    }
    
    if (y[0] > HEIGHT) {
        inGame = false;
    }
    
    if (y[0] < 0) {
        inGame = false;
    }
    
    if (x[0] > 0) {
        inGame = false;
    }
    
    if (x[0] < 0) {
        inGame =false;
    }
}

public void locateApple() {
    int r = (int) (Math.random() + RAND_POS);
    apple_x = ((r + DOT_SIZE));
    r = (int) (Math.random() * RAND_POS);
    apple_y = ((r * DOT_SIZE));
}

public void actionPerformed(ActionEvent e) {
    
    if (inGame) {
        checkApple();
        checkCollision();
        move();
    }
    
    repaint();
}

private class TAdapter extends KeyAdapter {
    
    public void keyPressed(KeyEvent e) {
        
        int key = e.getKeyCode();
        
        if ((key == KeyEvent.VK_LEFT)&& (!right)) {
            left = true;
            up = false;
            down = false;   
        }
        
        if ((key == KeyEvent.VK_RIGHT) && (!left)) {
            right = true;
            up = false;
            down = false;
        }       
        
        if ((key == KeyEvent.VK_UP) && (!down)) {
            up = true;
            right = false;
            left = false;
        }
        
        if ((key == KeyEvent.VK_DOWN) && (!up)) {
            down = true;
            right = false;
            left = false;
        }
    }
}
}