paintComponent (Graphics g)

package test.gui;
 
import javax.swing.*;
import java.awt.Graphics2D;
import java.awt.Graphics;
import java.awt.Color;
 
public class RotatableJLabel
  extends JLabel
{
 
  RotatableJLabel (String aLabel, int aRotationAngle)
  {
    super (aLabel);
  }
  
  public void paintComponent (Graphics g)
  {
    // Normally this method should do the automatic redraw upon needs...
    // More aftere the w-e when I will be further in the book 
    // Also with the the World Soccer Cup I will not be there too much !
    Graphics2D G2D = (Graphics2D) g;
    G2D.draw3DRect ( 0, 0, 0, 0, false);
    G2D.setBackground (Color.blue);
    System.out.println ("Called");
  }
 
/** 
  *
  */
  public static void main (String[] args)
  {
    JFrame f = new JFrame (RotatableJLabel.class.getClass ().getName ());
    f.setSize (300, 300);
    f.setVisible (true);
    f.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE);
    RotatableJLabel r 
      = new RotatableJLabel (RotatableJLabel.class.getClass ().getName (), 30);    
    f.getContentPane ().add ( r );      
  }
} 

package test.gui;
 
import javax.swing.*;
import java.awt.Graphics2D;
import java.awt.Graphics;
import java.awt.Color;
//import java.lang.Math.PI;
/**
  * @author <a href="mailto:tsmets@altern.org">Thomas SMETS</a>
  */
public class RotatableJLabel
  extends JLabel
{
 
  public static final double DEFAULT_ROTATION_ANGLE = Math.PI / 2;
  public static final double ZEROd = 0d;
  double rotationAngle = 0d;
  
  RotatableJLabel (String aLabel)
  {
    this (aLabel, DEFAULT_ROTATION_ANGLE);    
  }
  
  RotatableJLabel (String aLabel, double aRotationAngle)
  {
    super (aLabel);
    rotationAngle = aRotationAngle;
  }
  
  public void paintComponent (Graphics g)
  {
    Graphics2D G2D = (Graphics2D) g; // So I get a reference to the Graphic
    super.paintComponent (g);        // Request parent to draw it for the sake of simplicity
//    G2D.rotate (this.rotationAngle, this.ZEROd, this.ZEROd);    
    G2D.rotate (rotationAngle);
//    G2D.setBackground (Color.blue);    
//    G2D.setColor (Color.red);
    System.out.println ("Component::paintComponent");
  }
 
// This doesn't help, either
//  public void paint (Graphics g)
//  {
//    Graphics2D G2D = (Graphics2D) g;
//    super.paint (g);    
//    G2D.rotate (rotationAngle);
//    G2D.setBackground (Color.blue);
//    System.out.println ("Component::paint");    
//  }
 
/** 
  *
  */
  public static void main (String[] args)
  {
    JFrame f = new JFrame (RotatableJLabel.class.getName ());
    RotatableJLabel r 
      = new RotatableJLabel (RotatableJLabel.class.getName () );    
    f.getContentPane ().add ( r );    
    f.setSize (300, 300);
    f.setVisible (true);
    f.setDefaultCloseOperation (JFrame.EXIT_ON_CLOSE); 
  }
} // made with www.jcreator.com