Thread: Mutiple classfile, JPanel nothing shows up

Originally Posted by Norm

Break the statement up into single steps.

setBounds() is a void method. You can not add(void) to a container.

Ok I got it but... I need to make the layout translucent... I changed my code a bit :

I Created objects of class ball and pad I don't really know if it's a good idea tho!

 import java.awt.*;
import java.awt.Color;
import java.awt.event.*;
 
 
import javax.swing.*;
 
 
public class arkanoidGame extends JFrame {
	FlowLayout layout = new FlowLayout();
	ball theBall = new ball();
	pad thePad = new pad();
	JButton startButton = new JButton("Start Game");
 
 
	private static final long serialVersionUID = 1L;
 
 
	public arkanoidGame(String name) {	
		super(name);
 
	}
	public void addComponentsToPane(final Container pane) {
 
		final JPanel panel = new JPanel();	
		JPanel controls = new JPanel();
		controls.setLayout(new FlowLayout());
		panel.setLayout(null);		
		controls.add(startButton);
 
		startButton.addActionListener(new ActionListener() {
			public void actionPerformed(ActionEvent e) {
				panel.validate();
				panel.repaint();
 
			}
		});
		//pane.add(controls,BorderLayout.SOUTH);
		pane.add(theBall);
		theBall.setBounds(0,0,800,600);
		pane.add(thePad);
		thePad.setBounds(0,500,800,100);
	}
 
 
	private static void createAndShowGui() {
		arkanoidGame frame = new arkanoidGame("Arkanoid Game");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);					
		frame.pack();
		frame.setSize(800,600);
		frame.setBounds(0,0,800,600);	
		frame.addComponentsToPane(frame.getContentPane());	
		frame.setFocusable(true);
		frame.setFocusTraversalKeysEnabled(false);
		frame.setVisible(true);		
 
	}
 
	public static void main(String[] args) {
		try {
            //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
            UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
        } catch (UnsupportedLookAndFeelException ex) {
            ex.printStackTrace();
        } catch (IllegalAccessException ex) {
            ex.printStackTrace();
        } catch (InstantiationException ex) {
            ex.printStackTrace();
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        }
		  UIManager.put("swing.boldMetal", Boolean.FALSE);
 
	        javax.swing.SwingUtilities.invokeLater(new Runnable(){
	            public void run() {
	                createAndShowGui();
 
	            }	
 
	        });
	}
}

Originally Posted by Norm

They should the play area's paintComponent() method call their drawing methods so they can all draw on the same surface.

Yes all draw on the same surface

Originally Posted by Norm

That will remove the problems with setBounds().

I need to set the background Translucent.. And I have no method in theBall object to do it.

Originally Posted by Norm

Is that for a component? Or for a shape that you are drawing?
What is beneath it that you want to see?

Well theBall has to go anywhere on the screen so the bounds are 0,0,800,600 which takes all the screen so I can't see the thePad

Originally Posted by Norm

You missed the point of post#52.
The playing surface is the whole screen on which are drawn the ball and pad. There is one component: the playing surface. The ball and pad are not components added to a container. The have drawMe methods that are called by the playing surface's paintComponent() method.

I understand this... The playing surface is the JPanel or the FlowLayout?
even if I do something like this :

panel.setBackground(Color.TRANSLUCENT) or
layout.setBackground(Color.TRANSLUCENT)

None of those are Component so I get an error.

Originally Posted by Norm

Please post the full text of the error messages.

Why do you need a translucent component?

Well you right I don't need a translucent component. I got my two object showing right now I changed the bound for theBall.setBounds(0,0,200,200) and the pad showed up because it was underneath it.

Now If I want movement for them... If I want the pad to move

Originally Posted by Norm

The ball (and pad) class should not extend a component and should not cover anything.

So why if the bounds of the ball is the full screen it hides the pad?

Originally Posted by Norm

The ball (and pad) class should not extend a component and should not cover anything.

If you want a shape (pad) to move, change the x,y vaues for the location where it is being drawn.

Well in my class pad some methods are in there to make it move but they are not being called

Originally Posted by Norm

If you don't call them, what are they for?

I created a new method in arkanoidGame

public void actionPerformed(ActionEvent e) {
thePad.actionPerformed(e);
System.out.println("The Pad is being Called");
}


doesn't print anything

arkanoidGame.java

import java.awt.*;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
 
 
 
import javax.swing.*;
 
 
public class arkanoidGame extends JFrame implements ActionListener {
	FlowLayout layout = new FlowLayout();
	ball theBall = new ball();
	pad thePad = new pad();
 
 
	private static final long serialVersionUID = 1L;
 
 
	public arkanoidGame(String name) {	
		super(name);
 
	}
	public void addComponentsToPane(final Container pane) {
 
		final JPanel panel = new JPanel();	
		panel.setLayout(null);	
		pane.add(theBall);
		theBall.setBounds(50,50,75,75);
		pane.add(thePad);
	}
 
	public void actionPerformed(ActionEvent e) {
		thePad.actionPerformed(e);
		System.out.println("The Pad is being Called");
	}
 
 
	private static void createAndShowGui() {
		arkanoidGame frame = new arkanoidGame("Arkanoid Game");
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);					
		frame.pack();
		frame.setSize(800,600);
		frame.setBounds(0,0,800,600);	
		frame.addComponentsToPane(frame.getContentPane());	
		frame.setFocusable(true);
		frame.setFocusTraversalKeysEnabled(false);
		frame.setVisible(true);
	}
 
	public static void main(String[] args) {
		try {
            //UIManager.setLookAndFeel("com.sun.java.swing.plaf.windows.WindowsLookAndFeel");
            UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
        } catch (UnsupportedLookAndFeelException ex) {
            ex.printStackTrace();
        } catch (IllegalAccessException ex) {
            ex.printStackTrace();
        } catch (InstantiationException ex) {
            ex.printStackTrace();
        } catch (ClassNotFoundException ex) {
            ex.printStackTrace();
        }
		  UIManager.put("swing.boldMetal", Boolean.FALSE);
 
	        javax.swing.SwingUtilities.invokeLater(new Runnable(){
	            public void run() {
	                createAndShowGui();
 
	            }	
 
	        });
	}
 
}

pad.java

import java.awt.Color;
import java.awt.Graphics;
import java.awt.Graphics2D;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.KeyEvent;
import java.awt.event.KeyListener;
import java.awt.geom.Rectangle2D;
import javax.swing.JPanel;
import javax.swing.Timer;
 
 
public class pad extends JPanel implements KeyListener, ActionListener {
 
	Timer t = new Timer(5, this);
 
	double rectX = 15;
	double rectY = 535;
	int rectWidth = 80;
	int rectHeight = 20;
	double rectVeloX = 0.0;
	double rectVeloY = 0.0;
 
	private static final long serialVersionUID = 1L;
 
 
	public void paint(Graphics draw2D){			
		super.paint(draw2D);		
		Graphics2D draw = (Graphics2D) draw2D;
		draw.setColor(Color.red);
		draw.fill(new Rectangle2D.Double(rectX,rectY, rectWidth, rectHeight));
 
		}
 
 
	public void actionPerformed (ActionEvent e) {
	   	repaint();
		rectX += rectVeloX;
		rectY += rectVeloY;
 
	}
 
	public void left() {
		if (rectX <= 0) 
		{
			rectVeloX = 0;
			rectX = 0;
		}
		else {
			 rectVeloX = -1.5;
			 rectVeloY = 0;
		}		
	}
 
	public void right() {
		   if ((rectX+rectWidth) >= 800)
		   {
			   rectVeloX = 0;
			   rectX = 800-rectWidth;
		   }
		   else {
			   rectVeloX = 1.5;
			   rectVeloY = 0;
		   }		
	}
 
 
	public void keyPressed(KeyEvent e) {
		int key = e.getKeyCode();
 
		   if (key == KeyEvent.VK_RIGHT ) {
			   right();
 
	    }  if (key == KeyEvent.VK_LEFT ) {
	    		left();
	    }
 
	}
 
	public void keyReleased(KeyEvent e) {
		int key = e.getKeyCode();
 
			if (key == KeyEvent.VK_RIGHT) {
				rectVeloX = 0;
				rectVeloY = 0;
 
			}
 
			if (key == KeyEvent.VK_LEFT) {
				rectVeloX = 0;
				rectVeloY = 0;
			}
	}
 
	public void keyTyped(KeyEvent e) {}		
 
}

ball.java

import javax.swing.*;
import java.awt.*;
 
 
public class ball extends JPanel implements Runnable{
 
	private static final long serialVersionUID = 1L;
	int ballX = 50;
	int ballY = 50;
	int ballWH = 25;
 
 
	public void init() { 
		setBackground(Color.BLUE);
	}
 
	public void start() {
		// define a new thread 
		Thread th = new Thread (this); 
		// start this thread 
		th.start (); 
		} 	
 
	public void stop() { } 	
	public void destroy() { } 
 
 
 
	public void paint (Graphics g) {
		super.paint(g);
		g.setColor(Color.blue);
		g.fillOval(ballX,ballY,ballWH,ballWH);
		System.out.println("ball bounds = " + getBounds());
	} 	
 
	public void run() {
		// lower ThreadPriority 
		Thread.currentThread().setPriority(Thread.MIN_PRIORITY); 
 
		// run a long while (true) this means in our case "always" 
		while (true) 
		{ 
			ballX++;
			ballY++;
			repaint(); 
 
		try 
		{
		// Stop thread for 20 milliseconds 
		Thread.sleep (20); 
		} 
		catch (InterruptedException ex) 
		{
		// do nothing 
		} 
 
		// set ThreadPriority to maximum value 
		Thread.currentThread().setPriority(Thread.MAX_PRIORITY); 
 
		}
 
 
	}
 
}

Originally Posted by Norm

Can you explain what the code in post#67 is supposed to do?

Well I was trying to move the pad somehow

What problems are you trying to solve now?

I see that ball and pad still extend JPanel. That was supposed to have been removed.

I removed the JPanel and now a loads of error popup

Exception in thread "AWT-EventQueue-0" java.lang.Error: Unresolved compilation problems:
The method add(Component) in the type Container is not applicable for the arguments (ball)
The method setBounds(int, int, int, int) is undefined for the type ball
The method add(Component) in the type Container is not applicable for the arguments (pad)