Graphics2D setTransform (Rotation?)

Question

I am having problems trying to get strings to rotate usin code taken from the Java Developers Almanac 2000. I am using the following code and the strange thing is no errors occur, but the text does not appear on screen.
      AffineTransform at = new AffineTransform();
      at.setToRotation(-Math.PI/2.0);
      g2d.setTransform(at);
      g2d.drawString(this.getText(), 0, g2d.getFontMetrics().getHeight());
Thankyou in advance...
Regards, Richard Lannan

Answer 1

Hi, Richard.
Your program works, at least on my machine.
import java.awt.*;
import javax.swing.*;
import java.awt.geom.*;
public class RotateText extends JFrame {
  public RotateText()     {
          JPanel p = new JPanel() {
               public void paintComponent(Graphics g) {
                    Graphics2D g2d = (Graphics2D)g;
                    System.out.println("inside paintComponent()");
                    g2d.setColor(Color.black);
                    AffineTransform at = new AffineTransform();
                    at.setToRotation(-Math.PI/2.0);
                    g2d.setTransform(at);
                    g2d.drawString("Hello World", 0, g2d.getFontMetrics().getHeight());
                    // g2d.drawString("Hello World", 100, 100);
          getContentPane().add(p);
          p.repaint();
     public static void main(String args[])
          RotateText f = new RotateText();
          f.setSize(300,300);
          f.setVisible(true);
}BTW: You'd better use
g2d.transform(at);
instead of
g2d.setTransform(at);
because the 'setTransform()' can cause undesired effects.
Cheers, Tom