Author: Zafir Anjum

Rotate the JLabel by 90 degrees either clockwise or anti-clockwise. Works on JDK 1.2+.

A new subclass of BasicLabelUI is created to handle the proper dimensions and rendering. The Graphics2D class is used to handle the rendering.

import java.awt.*;
import java.util.*;
import java.awt.event.*;
import javax.swing.*;
import javax.swing.border.*;

import javax.swing.plaf.basic.*;
import java.awt.geom.*;


// This code uses Graphics2D which is supported only on Java 2

public class Main
{
	public static void main(String[] args)
	{
		JFrame frame = new JFrame("Main");
		frame.addWindowListener( new WindowAdapter() {
			public void windowClosing(WindowEvent e)
			{
				Window win = e.getWindow();
				win.setVisible(false);
				win.dispose();
				System.exit(0);
			}
		} );
		
		frame.getContentPane().setLayout( new FlowLayout() );

		ImageIcon icon = new ImageIcon( "dukeWave.gif" ) ;
		JLabel l = new JLabel( "Rotated anti-clockwise", icon, SwingConstants.LEFT );
		l.setUI( new VerticalLabelUI(false) );
		l.setBorder( new EtchedBorder() );
		frame.getContentPane().add( l );

		l = new JLabel( "Rotated Clockwise", icon, SwingConstants.LEFT );
//		l.setHorizontalTextPosition( SwingConstants.LEFT );
		l.setUI( new VerticalLabelUI(true) );
		l.setBorder( new EtchedBorder() );
		frame.getContentPane().add( l );
		frame.getContentPane().add( new JButton( "Button" ) );
		frame.pack();
		frame.show();
		
		
	}
}



class VerticalLabelUI extends BasicLabelUI
{
	static {
		labelUI = new VerticalLabelUI(false);
	}
	
	protected boolean clockwise;
	VerticalLabelUI( boolean clockwise )
	{
		super();
		this.clockwise = clockwise;
	}
	

    public Dimension getPreferredSize(JComponent c) 
    {
    	Dimension dim = super.getPreferredSize(c);
    	return new Dimension( dim.height, dim.width );
    }	

    private static Rectangle paintIconR = new Rectangle();
    private static Rectangle paintTextR = new Rectangle();
    private static Rectangle paintViewR = new Rectangle();
    private static Insets paintViewInsets = new Insets(0, 0, 0, 0);

	public void paint(Graphics g, JComponent c) 
    {

    	
        JLabel label = (JLabel)c;
        String text = label.getText();
        Icon icon = (label.isEnabled()) ? label.getIcon() : label.getDisabledIcon();

        if ((icon == null) && (text == null)) {
            return;
        }

        FontMetrics fm = g.getFontMetrics();
        paintViewInsets = c.getInsets(paintViewInsets);

        paintViewR.x = paintViewInsets.left;
        paintViewR.y = paintViewInsets.top;
    	
    	// Use inverted height & width
        paintViewR.height = c.getWidth() - (paintViewInsets.left + paintViewInsets.right);
        paintViewR.width = c.getHeight() - (paintViewInsets.top + paintViewInsets.bottom);

        paintIconR.x = paintIconR.y = paintIconR.width = paintIconR.height = 0;
        paintTextR.x = paintTextR.y = paintTextR.width = paintTextR.height = 0;

        String clippedText = 
            layoutCL(label, fm, text, icon, paintViewR, paintIconR, paintTextR);

    	Graphics2D g2 = (Graphics2D) g;
    	AffineTransform tr = g2.getTransform();
    	if( clockwise )
    	{
	    	g2.rotate( Math.PI / 2 ); 
    		g2.translate( 0, - c.getWidth() );
    	}
    	else
    	{
	    	g2.rotate( - Math.PI / 2 ); 
    		g2.translate( - c.getHeight(), 0 );
    	}

    	if (icon != null) {
            icon.paintIcon(c, g, paintIconR.x, paintIconR.y);
        }

        if (text != null) {
            int textX = paintTextR.x;
            int textY = paintTextR.y + fm.getAscent();

            if (label.isEnabled()) {
                paintEnabledText(label, g, clippedText, textX, textY);
            }
            else {
                paintDisabledText(label, g, clippedText, textX, textY);
            }
        }
    	
    	
    	g2.setTransform( tr );
    }
}

Posted On: 14-Feb-1999

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