I'm making a Java pong clone and I've been running into a few troubles.

[mcurry]

EDIT: (Just realised that this is probably in the wrong section, sorry. New to java would probably be a better section.)

After looking all over the place and pulling together on everything I've found over about 8 months by myself without help, I feel that I'm ready to make a Java game. I figured I'd start off with something that isn't too complicated, and then move on to more difficult stuff later on. So I chose to make a clone of pong.

For the purpose of writing code, testing it and compiling it in eclipse, I haven't written a main method, but I will be sure to put one in.

main.java

package blank;

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Image;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.util.*;
import java.applet.*;

public class main extends Applet implements KeyListener, Runnable{

	ball ball;
	paddles player;
	paddles computer;
	
	Thread t1;
	
	private Image dbImage;
	private Graphics dbg;
	
	int ballSpeedx = 10;
	int ballSpeedy = 1;
	
	public void init() {
		
		setSize(1000, 600);
		
		addKeyListener(this);
		
		player = new paddles();
		computer = new paddles();
		ball = new ball(30, 30, 485, 285, ballSpeedx, ballSpeedy, 10);
		
	}
	
	public void start() {
		
		t1 = new Thread(this);
		t1.start();
		
	}
	
	public void stop() {
		
		t1.stop();
		
	}
	
	public void run() {
		
		Thread.currentThread().setPriority(Thread.MIN_PRIORITY);
		
		while(true) {
			
			ball.move(3, 3);
				
			if(ball.getX() > 1000 - ball.getWidth()) {
				
				player.score();
				int bx = ball.getX();
				int by = ball.getY();
				ball.setLocation(bx, by);
					
			} else if(ball.getX() < 0 + ball.getWidth()) {
					
				computer.score();
					
			}
			
			
			repaint();
		
			try {
			
				Thread.sleep(10);
				
			} catch (InterruptedException e) {
			
				e.printStackTrace();
			
			}
		
		}	
			
	}
	
	public void paint(Graphics g) {
		
		int pw = 30;
		int ph = 120;
		int xpos = 0;
		int ypos = 300 - (ph/2);
		
		ball.paint(g);
		player.drawPaddle(g, xpos, ypos, pw, ph);
		computer.drawPaddle(g, 970, ypos, pw, ph);
		player.drawScores(g, player.getScore(), 100, 100);
		computer.drawScores(g, computer.getScore(), 850, 100);
		
		
		
	}
	
	public void update(Graphics g) {
		
		if(dbImage == null) {
			
			dbImage = createImage ((int)this.getSize().width, (int)this.getSize().height);
			dbg = dbImage.getGraphics ();
			
		}
		
		dbg.setColor(getBackground());
		dbg.fillRect(0, 0, (int)this.getSize().width, (int)this.getSize().height);
		
		dbg.setColor(getForeground());
		paint(dbg);
		
		g.drawImage(dbImage, 0, 0, this);
		
	}
	
	public void keyPressed(KeyEvent e) {
		
		int key = e.getKeyCode();
		if(key == KeyEvent.VK_UP) {
			
			int ypos = player.getY();
			ypos += 10;
			
		}
		
		if(key == KeyEvent.VK_DOWN) {
			
			int ypos = player.getY();
			ypos += 10;
			
		}
		
	}

	public void keyReleased(KeyEvent e) {
		
		
		
	}

	public void keyTyped(KeyEvent e) {
		
		
		
	}
	
}

ball.java

package blank;

import java.awt.Color;
import java.awt.Graphics;

public class ball{

	private int pos_x;
	private int pos_y;
	
	private int first_x;
	private int first_y;
	
	private int width;
	private int height;
	
	int x_speed;
	int y_speed;
	
	int maxspeed;
	
	public ball(int w, int h, int x, int y, int dx, int dy, int ms) {
		
		pos_x = x;
		pos_y = y;

		first_x = x;
		first_y = y;

		x_speed = dx;
		y_speed = dy;
		
		width = w;
		height = h;

		maxspeed = ms;
		
	}
	
	public void move(int dy, int dx) {
		
		first_x += dx;
		first_y += dy;
		
	}
	
	public void paint(Graphics g) {
		
		g.setColor(Color.red);
		g.fillRect(first_x, first_y, width, height);
		
	}
	
	public int getX() {
		
		return pos_x;
		
	}
	
	public int getY() {
		
		return pos_y;
		
	}
	
	public int getWidth() {
		
		return width;
		
	}
	
	public int getHeight() {
		
		return height;
		
	}
	
	public void setLocation(int bx, int by) {
		
		bx = first_x;
		by = first_y;
		
		pos_x = bx;
		pos_y = by;
	}
	
}

paddles.java

package blank;

import java.applet.*;
import java.awt.*;
import java.util.*;
import java.net.*;

public class paddles{

	private int score;
	private int ypos = 240;
	
	public paddles() {
		
		score = 0;
		
	}
	
	public int getScore() {
		
		return score;
		
	}
	
	public void score() {
		
		score++;
		
	}
	
	public void drawPaddle(Graphics g, int xpos, int ypos, int pw, int ph) {
		
		g.setColor(Color.red);
		g.fillRect(xpos, ypos, pw, ph);
		
	}
	
	public void drawScores(Graphics g, int score, int locx, int locy) {
		
		g.drawString("Score: " + score, locx, locy);
		
	}
	
	public int getY() {
		
		return ypos;
		
	}
	
}

The things I'm really struggling to do is to:

• get the ball to return to the middle of the screen once it leaves the screen
• get the player paddle to move
• get the scores to update

Does anybody have any suggestions as to how I could get these three things working?

(I'm kinda new to java outside of the ACM libraries.)

[DarrylBurke]

EDIT: (Just realised that this is probably in the wrong section, sorry. New to java would probably be a better section.)

Moved from Java 2D

db