Probleme mit dem Updaten von graphischen Komponenten

[MD]

Hallo,
ich habe folgende Hauptklasse:

--- Anfang ---

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


public class GUITest extends JFrame {
    static protected JLabel label;
    DPanel d;

    public  GUITest(){
        addWindowListener(new WindowAdapter() {
            public void windowClosing(WindowEvent e) {System.exit(0);}
        });
        getContentPane().setLayout(new BorderLayout());

        d = new DPanel();
        d.setBackground(Color.white);
        getContentPane().add(d);

        label = new JLabel("Drag rectangle around within the area");
        getContentPane().add("South", label);
    }

    public static void main(String s[]) {
        
    	GUITest f = new GUITest();
        f.pack();
        f.setSize(new Dimension(550,250));
        f.show();
    }
}


class DPanel extends JPanel implements MouseListener, MouseMotionListener{
	OwnRectangle rect = new OwnRectangle(0, 0, 100, 50);
        
	// Holds the coordinates of the user's last mousePressed event.
	static int last_x, last_y;
	boolean firstTime = true;
	static Rectangle area;                

    public DPanel(){
               setBackground(Color.white);
                addMouseMotionListener(this);
                addMouseListener(this);
    }

    // Handles the event of the user pressing down the mouse button.
    public void mousePressed(MouseEvent e){
    	rect.mousePressed(e);
    }

    // Handles the event of a user dragging the mouse while holding
    // down the mouse button.
    public void mouseDragged(MouseEvent e){
    	rect.mouseDragged(e);
    }

    // Handles the event of a user releasing the mouse button.
    public void mouseReleased(MouseEvent e){
    	rect.mouseReleased(e);
    }
       
     // This method is required by MouseListener.
     public void mouseMoved(MouseEvent e){}

     // These methods are required by MouseMotionListener.
     public void mouseClicked(MouseEvent e){}
     public void mouseExited(MouseEvent e){}
     public void mouseEntered(MouseEvent e){}
                         
     // Updates the coordinates representing the location of the current rectangle.
     public void updateLocation(MouseEvent e){
     	rect.updateLocation(e);
		repaint();
     }

    public void paintComponent(Graphics g){
        super.paintComponent(g);
        Graphics2D g2 = (Graphics2D)g;
        g2.setStroke(new BasicStroke(8.0f));
        Dimension dim = getSize();
        int w = (int)dim.getWidth();
        int h = (int)dim.getHeight();

        if ( firstTime ) {
            area = new Rectangle(dim);
            rect.setLocation(w/2-50, h/2-25);
            //rect.setLocation(100, 100);
            firstTime = false;
        }
        // Clears the rectangle that was previously drawn.
        g2.setPaint(Color.white);
        g2.fillRect(0, 0, w, h);

        // Draws and fills the newly positioned rectangle.
        g2.setColor(Color.black);
        g2.fill(rect);	
        g2.draw(rect);
    }
}

--- Ende ---

und noch folgende Klasse:



--- Anfang ---

import java.awt.Rectangle;
import java.awt.event.MouseEvent;

/*
 * Created on 24.09.2004
 *
 * TODO To change the template for this generated file go to
 * Window - Preferences - Java - Code Style - Code Templates
 */

/**
 * @author
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class OwnRectangle extends Rectangle {

	// True if the user pressed, dragged or released the mouse outside of
    // the rectangle; false otherwise.
    boolean pressOut = false;  
	
	public OwnRectangle (int x, int y, int width, int height) {
		super(x, y, width, height);
	}
     
	public void mousePressed(MouseEvent e){
		DPanel.last_x = this.x - e.getX();
		DPanel.last_y = this.y - e.getY();
		
		// Checks whether or not the cursor is inside of the rectangle
        // while the user is pressing the mouse.
        if ( this.contains(e.getX(), e.getY()) ) {
	 updateLocation(e);
        } else {
        	GUITest.label.setText("First position the cursor on the rectangle and then drag.");        	
        }
	}
	
	public void mouseDragged(MouseEvent e){
		if ( !pressOut) {
			updateLocation(e);
		} else {
			GUITest.label.setText("First position the cursor on the rectangle and then drag.");
		}
	}
	
	public void mouseReleased(MouseEvent e) {
		// Checks whether or not the cursor is inside of the rectangle
        // when the user releases the mouse button.
		if ( this.contains(e.getX(), e.getY()) ) {
			 updateLocation(e);
		} else {
			GUITest.label.setText("First position the cursor on the rectangle and then drag.");
			pressOut = false;
		}
	}
	
	public void updateLocation(MouseEvent e){
		this.setLocation(DPanel.last_x + e.getX(), DPanel.last_y + e.getY());
		/*
         * Updates the label to reflect the location of the
         * current rectangle
         * if checkRect returns true; otherwise, returns error message.
         */
		if (checkRect()) {
			GUITest.label.setText("Rectangle located at " +
                    this.getX() + ", " +
                    this.getY());
		} else {
			GUITest.label.setText("Please don't try to "+
            " drag outside the area.");
		}
	}
	
    boolean checkRect(){
    	if (DPanel.area == null) {
    		return false;
    	}

    	if(DPanel.area.contains(this.x, this.y, 100, 50)){
    		return true;
    	}
    	int new_x = this.x;
    	int new_y = this.y;
     
    	if((this.x+100)>DPanel.area.getWidth()){
    		new_x = (int)DPanel.area.getWidth()-99;
    	}
    	if(this.x < 0){
    		new_x = -1;  
    	}
    	if((this.y+50)>DPanel.area.getHeight()){
    		new_y = (int)DPanel.area.getHeight()-49;
    	}
    	if(this.y < 0){
    		new_y = -1;
    	}
    	this.setLocation(new_x, new_y);
    	return false;
    }
}

--- Ende ---

Wenn man es kompiliert, sieht man, dass die Koordinaten richtig aktualisiert werden.
Nur das Rechteck wird nicht neu gezeichnet, obwohl ich in der updateLocation-Methode ein repaint() aufrufe.
Kann mir jemand weiterhelfen???
Ich finde den Fehler einfach nicht.


MD

[Edit by foobar: Codetags eingefügt]

 

[foobar]

@MD Bitte verwende Codetags, falls du Quelltext postest.

 

[MD]

mein Fehler!!
hab das repaint() vergessen!