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key conflicts

 
Greenhorn
Posts: 20
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I am designing a pong game but I am have trouble with key conflicts. can anyone get me any advice on keylistners or reccomend an online tutorial on the subject
 
author and iconoclast
Posts: 24203
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Can you explain in a bit more detail what problems you're having -- i.e., what you're doing, and what's not working as you'd expect? Let's continue this discussion over in the Swing/AWT/SWT/JFace forum -- I'm moving this thread there.
 
Nikos kat
Greenhorn
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Hello Ernest, thanks again for your help.

If you remember I'm trying my hand at game programing and I'm trying my own version of Pong. My code doesn't let me control both paddles at once using the keyboard, im considering trying to use 1 mouse and 1 keyboard.




Let me show you the code

import java.awt.*;

import javax.swing.*;
import java.awt.event.*;


//a crude version of pong with two green paddles and a green ball that doesn't move yet
public class PongGame extends JFrame implements Runnable
{

public static final int GAME_WIDTH = 1000;
public static final int GAME_HEIGHT = 600;
public static final int LEFT_PADDLE_FROM_LEFT = 10;
public static final int RIGHT_PADDLE_FROM_RIGHT = GAME_WIDTH - 10 - Paddle.WIDTH;

public static final int MOVE_PADDLE_UP = 1;
public static final int MOVE_PADDLE_DOWN = 2;
public static final int NO_MOVE = 0;

private int leftPaddleMovementStatus;
private int rightPaddleMovementStatus;

private Thread thread;
private boolean running = false;

private Ball ball;
private Paddle leftPaddle;
private Paddle rightPaddle;

//used in double duffering
private Image dbImage;
private Graphics dbg;
//used in game update to move paddles





public PongGame()
{

setVisible(true);

//start the ball right in the center of the game
ball = new Ball(GAME_WIDTH/2 - Ball.DIAMETER/2, GAME_HEIGHT/2 - Ball.DIAMETER/2);

leftPaddle = new Paddle(LEFT_PADDLE_FROM_LEFT, GAME_HEIGHT/2 - Paddle.HEIGHT/2 );
rightPaddle = new Paddle(RIGHT_PADDLE_FROM_RIGHT, GAME_HEIGHT/2 - Paddle.HEIGHT/2);

setUpListeners();

thread = new Thread(this);
thread.start();
}


private void setUpListeners() {
Container clientArea = getContentPane();
clientArea.setFocusable(true);
addKeyListener(new KeyAdapter(){
public void keyPressed(KeyEvent e){
if(e.getKeyCode() == KeyEvent.VK_UP ){
rightPaddleMovementStatus = MOVE_PADDLE_UP;
}
if(e.getKeyCode() == KeyEvent.VK_DOWN ){
rightPaddleMovementStatus = MOVE_PADDLE_DOWN;
}
if(e.getKeyCode() == KeyEvent.VK_W ){
leftPaddleMovementStatus = MOVE_PADDLE_UP;
}
if(e.getKeyCode() == KeyEvent.VK_S ){
leftPaddleMovementStatus = MOVE_PADDLE_DOWN;
}
}});
}

public void run(){
running = true;
while(running){
gameUpdate();
render();
paintScreen();
try{
Thread.sleep(20);
}
catch(InterruptedException e){};
}
System.exit(0);
}

public void gameUpdate(){
//check that paddle does not run of screen, if safe move the paddle
if(leftPaddle.getPoint().y > 0 && leftPaddle.getPoint().y < GAME_HEIGHT - Paddle.HEIGHT
&& rightPaddle.getPoint().y > 0 && rightPaddle.getPoint().y < GAME_HEIGHT - Paddle.HEIGHT){

if(leftPaddleMovementStatus == MOVE_PADDLE_UP){
leftPaddle.getPoint().y -= 2;
}
if(leftPaddleMovementStatus == MOVE_PADDLE_DOWN){
leftPaddle.getPoint().y += 2;
}
if(rightPaddleMovementStatus == MOVE_PADDLE_UP){
rightPaddle.getPoint().y -= 2;
}
if(leftPaddleMovementStatus == MOVE_PADDLE_DOWN){
rightPaddle.getPoint().y += 2;
}
//reset status for next keylisten event
leftPaddleMovementStatus = NO_MOVE;
rightPaddleMovementStatus = NO_MOVE;
}
}

public void render(){


if(dbImage == null){
dbImage = createImage(GAME_WIDTH,GAME_HEIGHT);
if(dbImage == null){
System.out.println("error in making image");

}
else{
dbg = dbImage.getGraphics();
}
}

dbg.setColor(Color.black);
dbg.fillRect(0, 0, GAME_WIDTH, GAME_HEIGHT);
dbg.setColor(Color.green);

//draw paddles
int x = leftPaddle.getPoint().x;
int y = leftPaddle.getPoint().y;
dbg.fillRect(x, y, x + Paddle.WIDTH, y + Paddle.HEIGHT );
x = rightPaddle.getPoint().x;
y = rightPaddle.getPoint().y;
dbg.fillRect(x, y, x + Paddle.WIDTH, y + Paddle.HEIGHT );

//draw ball
dbg.fillOval(ball.getPoint().x, ball.getPoint().x,Ball.DIAMETER,Ball.DIAMETER);
}
/**
public void paint(Graphics gfx){
Container c = getContentPane();
Graphics g = c. getGraphics();

gfx.setColor(Color.black);
gfx.fillRect(0,0,22,22);
}
*/
private void paintScreen()
// actively render the buffer image to the screen
{
Container clientArea = getContentPane();
Dimension d = new Dimension(GAME_WIDTH, GAME_HEIGHT);
clientArea.setPreferredSize(d);

pack();
try {
Graphics g = clientArea.getGraphics(); // get the panel�s graphic context
if ((g != null) && (dbImage != null))
g.drawImage(dbImage, 0, 0, null);
g.dispose();
}
catch (Exception e)
{ System.out.println("Graphics not work");
}
}


public static void main(String[] args) {
new PongGame();
}

}


import java.awt.*;




public class Ball {

public static final int DIAMETER = 20;

private Point point;

public Ball(int xCoord, int yCoord){
point = new Point(xCoord,yCoord);
}

public Point getPoint(){
return point;
}
}

import java.awt.*;


public class Paddle {

public static final int WIDTH = 10;
public static final int HEIGHT = 40;

private Point point;

public Paddle(int xCoord, int yCoord){
point = new Point(xCoord,yCoord);
}

public Point getPoint(){
return point;
}
}
 
Ranch Hand
Posts: 4632
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have a look at the code in this thread, it might give you some ideas

http://forum.java.sun.com/thread.jspa?forumID=256&threadID=488614
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