Moving Icon in gridlayout SWING

**Loodistobilo** · November 24th, 2010, 07:34 PM

Hi, im very new at Java so please consider this your easiest answer for the day!

Im trying to build a game but i suck at the basics. So I just want to get the problem fixed where so i can move an Player Object across my gridlayout and having the image updating for the keyevents like Left, Right, Up, Down... for starters.

the code i have is something like this.

public class Graphics extends JPanel implements ActionListener {

public static JButton grid[][] = new JButton[12][12];
public JFrame window;
public Point gridLoc;
public Player player1;
public Player player2;

public Graphics() {

addKeyListener(new TAdapter());
setFocusable(true);
setBackground(Color.BLACK);
setDoubleBuffered(true);
setLayout(new GridLayout(12, 12));

for(int x = 0; x < 12; x++){
for(int y = 0; y < 12; y++){
grid[x][y] = new JButton();
add(grid[x][y]);
grid[x][y].addActionListener(this);
}
}
}

public void addPlayers() throws SpriteException{
player1 = new Player("Fire", 1);
grid[Player.currentRow][Player.currentCol].setIcon(player1.getPic());
player2 = new Player("Wizard", 2);
grid[Player.currentRow][Player.currentCol].setIcon(player2.getPic());
}

private class TAdapter extends KeyAdapter {

public void keyPressed(KeyEvent e) {
player1.keyPressed(e);
}
}

I have left alot of code which i consider not be critical for you guys to give me some pointers on how i will get my KeyEvents to just move my Player player1 object for example.

Thanks in advance.

**javapenguin** · November 24th, 2010, 07:45 PM

Originally Posted by Loodistobilo

Hi, im very new at Java so please consider this your easiest answer for the day!

Im trying to build a game but i suck at the basics. So I just want to get the problem fixed where so i can move an Player Object across my gridlayout and having the image updating for the keyevents like Left, Right, Up, Down... for starters.

the code i have is something like this.

 
public class Graphics extends JPanel implements ActionListener {
 
	public static JButton grid[][] = new JButton[12][12];
	public JFrame window;
	public Point gridLoc;
	public Player player1;
	public Player player2;
 
	public Graphics() {
 
		addKeyListener(new TAdapter());
		setFocusable(true);
		setBackground(Color.BLACK);
		setDoubleBuffered(true);
		setLayout(new GridLayout(12, 12));
 
		for(int x = 0; x < 12; x++){
			for(int y = 0; y < 12; y++){
				grid[x][y] = new JButton();
				add(grid[x][y]);
				grid[x][y].addActionListener(this);
			}
		}
	}
 
	public void addPlayers() throws SpriteException{
		player1 = new Player("Fire", 1);
		grid[Player.currentRow][Player.currentCol].setIcon(player1.getPic());
		player2 = new Player("Wizard", 2);
		grid[Player.currentRow][Player.currentCol].setIcon(player2.getPic());
	}
 
	private class TAdapter extends KeyAdapter {
 
		public void keyPressed(KeyEvent e) {
			player1.keyPressed(e);
		}
	}

I have left alot of code which i consider not be critical for you guys to give me some pointers on how i will get my KeyEvents to just move my Player player1 object for example.

Thanks in advance.

Does it have a method actionPerformed?

Also, your player1 doesn't appear to be defined in your constructor. I think it may be being lost after the method where you defined it ends.

So it won't recognize it in the TAdapater class.

**javapenguin** · November 24th, 2010, 07:49 PM

Did you ever tell it to set those buttons to be visible?

Actually, I don't know what problem you're having as you've never said.

**Loodistobilo** · November 24th, 2010, 07:59 PM

Hi thanks for your quick answear.

I might aswell say that I have an ActionPerformed but for now it might aswell just be a
System.out.println("test");
that says if the button actually does something.

The player class atm looks like this.

import java.awt.Image;
import java.awt.Rectangle;
import java.awt.event.KeyEvent;
 
import java.util.ArrayList;
 
import javax.swing.ImageIcon;
 
public class Player {
 
	public static ImageIcon image;
	public static ImageIcon fire = new ImageIcon("pieces/brook.png");
	public ImageIcon wizard = new ImageIcon("pieces/bking.png");
 
	public static int currentRow;
	public static int currentCol;
 
	public Player(String str, int player) throws SpriteException {	
		if(player == 1){
			currentRow = 5;
			currentCol = 0;
		}
		if(player == 2){
			currentRow = 0;
			currentCol = 0;
		}
	}
 
	public void moveLeft(){
		grid[Player.currentRow][Player.currentCol].setIcon(null);
                grid[Player.currentRow][Player.currentCol+1].setIcon(player1.getPic());
	}
 
	public void setImage(String str){
		if(str.equals("Wizard")){
			image = wizard;
		}
		if(str.equals("Fire")){
			image = fire;
		}
	}
 
	public static ImageIcon getPic(){
		ImageIcon p = image;
		return p;
	}
 
    public void keyPressed(KeyEvent e) {
        int key = e.getKeyCode();
        if (key == KeyEvent.VK_LEFT) { 
        	moveLeft();
        }
    }
 
}

I havent really been doing the movement yet. I just want the keyEvent to work. Since now i dont even get a system.out.print if i put on for Space. It just gives me alot of Nullpointerexceptions etc.

Thanks.

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