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Thread: Things Won't Move

  1. #1
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    Default Things Won't Move

    What I want it to do is make the rectangle move across the screen. Here's my code:
    package game;
     
    import java.awt.*;
    import javax.swing.*;
     
    public class Panel extends JPanel {
     
    	private int txtx, txty;
    	private int rectx, recty;
    	private int ovalx, ovaly;
    	private boolean start, running;
     
    	public Panel() {
    		txtx = 50;
    		txty = 50;
     
    		rectx = 50;
    		recty = 80;
     
    		ovalx = 50;
    		ovaly = 210;
     
    		start = true;
     
    		setBackground(Color.WHITE);
    		setForeground(Color.BLACK);
    		setFont(new Font("Ariel", Font.PLAIN, 20));
     
    		run();
    	}
     
    	public void run(){
    		if(start){
    			running = true;
                            gameloop();
    		}
    	}
     
    	public void paintComponent(Graphics g) {
    		super.paintComponent(g);
    		Graphics2D g2 = (Graphics2D) g;
     
    		g2.setRenderingHint(RenderingHints.KEY_ANTIALIASING,
    				RenderingHints.VALUE_ANTIALIAS_ON);
     
    		g2.drawString("diz iz mah texz", txtx, txty);
    		g2.setColor(Color.RED);
    		g2.fillRect(rectx, recty, 100, 100);
    		g2.setColor(Color.BLUE);
    		g2.fillOval(ovalx, ovaly, 100, 100);
    	}
     
    	public void gameloop() {
    		while (running) {
    			rectx++;
    			repaint();
     
    			try {
    				Thread.sleep(20);
    			} catch (Exception e) {
     
    			}
    		}
    	}
     
    }
     
    package game;
     
    import javax.swing.*;
     
    public class Game {
     
    	public static void main(String[] args) {
    		new Game();
    	}
     
    	public Game() {
    		JFrame f = new JFrame("My Graphics");
    		Panel p = new Panel();
     
    		f.setSize(800, 600);
    		f.setLocationRelativeTo(null);
    		f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
    		f.add(p);
    		f.setVisible(true);
    	}
     
    }
    Last edited by zeraxis; September 2nd, 2011 at 08:32 AM.


  2. #2
    Super Moderator Norm's Avatar
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    Default Re: Things Won't Move

    Does you code ever call the gameloop method or the run method?
    Add printlns to those methods to see if they are ever called.

  3. #3
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    Default Re: Things Won't Move

    I tried that and they both were called.

  4. #4
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    Default Re: Things Won't Move

    Did they return to allow the constructor to finish building the GUI and display it?

    The loop looks like it will go forever so the constructor never finishes and the GUI is not built.
    You need to put the forever loop in a new Thread and allow the constructor to exit.

  5. #5
    Super Moderator Norm's Avatar
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    Default Re: Things Won't Move

    This looks like the same problem as this:
    Need Some Help...

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