Rotating a JTextPane has minor problem

Here's my code. When you run it it appears that the TextPane is
missing, but when you hit the rotate button it flashes up briefly, in
the rotated location, but clipped oddly.

Anybody have any ideas what I'm doing wrong?

Thanks,

--gary

import javax.swing.*;
import javax.swing.text.*;
import javax.swing.border.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.geom.*;

public class Rotate extends JPanel {

    private TextPanel textPane;
    private JPanel parent;

    public Rotate() {

        setLayout(new BoxLayout(this, BoxLayout.PAGE_AXIS));
        JToolBar toolBar = buildToolbar();
        add(toolBar);

        parent = new JPanel();
        add(parent);
        parent.setBackground( Color.white);
        parent.setPreferredSize(new Dimension(640, 480));

        // Create a text pane.

        textPane = new TextPanel();
        StyledDocument doc = textPane.getStyledDocument();
        try {
            doc.insertString(doc.getLength(), "This is some sample
text.\nIt can be Rotated.", null);
        }
        catch (BadLocationException ble) {
            System.err.println("Couldn't insert initial text into text
pane.");
        }
        textPane.setBounds(0, 400, 240, 120);
        Border myBorder = BorderFactory.createLineBorder( Color.red );
        textPane.setBorder(myBorder);
        parent.add(textPane);
    }
    private JToolBar buildToolbar() {

        JToolBar toolBar = new JToolBar();
        toolBar.setRollover( true );
        toolBar.setFloatable( false );
        JButton rotateButton = new JButton("Rotate");
        rotateButton.setToolTipText( "Rotate text editing pane" );
        rotateButton.addActionListener( new ActionListener() {
            public void actionPerformed( ActionEvent e ) {
                textPane.setRotation(textPane.getRotation()+1);
            }
        });
        toolBar.add( rotateButton );
        return toolBar;
    }
    private static void createAndShowGUI() {
        //Make sure we have nice window decorations.
        JFrame.setDefaultLookAndFeelDecorated(true);

        //Create and set up the window.
        JFrame frame = new JFrame("Rotate");
        frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

        //Create and set up the content pane.
        JComponent newContentPane = new Rotate();
        newContentPane.setOpaque(true); //content panes must be opaque
        frame.setContentPane(newContentPane);

        //Display the window.
        frame.pack();
        frame.setVisible(true);
    }

    public static void main(String[] args) {
        //Schedule a job for the event-dispatching thread:
        //creating and showing this application's GUI.
        javax.swing.SwingUtilities.invokeLater(new Runnable() {
            public void run() {
                createAndShowGUI();
            }
        });
    }

}

class TextPanel extends JTextPane {

    // implements rotation for a JTextPane

    private int rotation;
    private int tx, ty;
    // vaild rotation values are:
    // 0 = no rotation
    // 1 = rotation 90 degree clockwise
    // 2 = rotation 180 degrees
    // 3 = rotation 90 degrees counterclockwise

    TextPanel() {
        rotation = 0;
        tx = 0;
        ty = 0;
    }
    public void setRotation( int newRotation ) {
        newRotation = newRotation % 4;
        int change = Math.abs(rotation-newRotation);
        if ((change&0x01)==1) {
            setSize(getHeight(),getWidth());
        }
        rotation = newRotation;
        switch (rotation) {
            case 0 : tx = 0; ty = 0; break;
            case 1 : tx = 1; ty = 0; break;
            case 2 : tx = 1; ty = 1; break;
            case 3 : tx = 0; ty = 1; break;
        }
        repaint();
    }