Name: jk109818 Date: 03/21/2003


FULL PRODUCT VERSION :
Java(TM) 2 Runtime Environment, Standard Edition (build 1.4.0-b92)
Java HotSpot(TM) Client VM (build 1.4.0-b92, mixed mode)

FULL OPERATING SYSTEM VERSION :
Microsoft Windows 2000 [Version 5.00.2195]

A DESCRIPTION OF THE PROBLEM :
Selection and caret are drawn incorrectly when JTextfield
is painted with Graphics2D that has a scale other than 1.

For example, if you scale a Graphics2D object:

Graphics2D g2d = (Graphics2D) g;
AffineTransform at = g2d.getTransform();
at.scale(10, 10);
g2d.setTransform(at);

and then paint a JTextField with that Graphics2D object,
the selection and caret are off by a few pixels.

See & run attached source code.

JDK 1.2.x and JDK 1.3.x had also a problem with JTextField
being painted on a Graphics2D that was translated by non-
integers. This problem seems to be fixed with JDK 1.4.x.
However, the scaling problem still remains.

STEPS TO FOLLOW TO REPRODUCE THE PROBLEM :
1. Compile attached source code
2. Run.


EXPECTED VERSUS ACTUAL BEHAVIOR :
Observe that the caret and the selection are drawn
incorrectly.


REPRODUCIBILITY :
This bug can be reproduced always.

---------- BEGIN SOURCE ----------

import javax.swing.JFrame;
import javax.swing.JTextField;
import javax.swing.JPanel;
import java.awt.geom.AffineTransform;
import java.awt.Graphics2D;
import java.awt.Graphics;
import java.awt.Canvas;
import java.awt.Font;


/**
 * This test case shows that the painting of the JTextField is "off"
 * under certain circumstances (mainly scaling). It's a very small
 * difference, so this class is designed to show how the issues
 * compound when the scale is increased.
 */
public class MagnifiedTextField extends JFrame
{

  public static void main(String[] argv)
  {
    new MagnifiedTextField();
  }

  public MagnifiedTextField()
  {
    super("Testing magnifying text");
    setSize(900,400);

    delegate_ = new ShuntedJTextField("the text field beckons");
    
    // different fonts show different behaviors,
    // but this one is particularly bad.
    // to see the effect, using the keyboard, highlight
    // the text "field b"
    delegate_.setFont(new Font("Verdana", Font.PLAIN, 9));

    // this sets the selection of the text to somewhere
    // that's a problem
    delegate_.setSelectionStart(8);
    delegate_.setSelectionEnd(14);


    // this paints the text field larger so that
    // the rendering issues are more obvious
    myJPanel_ = new JPanel()
      {
        public void paint(Graphics g)
        {
          if(g instanceof Graphics2D)
          {
            Graphics2D g2d = (Graphics2D) g;
            AffineTransform at = g2d.getTransform();
            at.scale(10, 10);
            g2d.setTransform(at);
            delegate_.myPaint(g2d);
          }
        }

      };

    myJPanel_.add(delegate_);
    setContentPane(myJPanel_);
    setVisible(true);
  }

  public void paint(Graphics g)
  {
    getContentPane().paint(g);
  }


  public class ShuntedJTextField extends JTextField
  {
    public ShuntedJTextField(String str)
    {
      super(str);
    }

    public void repaint(int x, int y, int h, int w)
    {
      // this forces a repaint of the main window
      // instead of this one
      MagnifiedTextField.this.repaint();
    }
    
    public void paint(Graphics g)
    {
      // we want to shunt painting ourselves
    }
    
    public void myPaint(Graphics g)
    {
      super.paint(g);
    }
  }

  JPanel myJPanel_;
  Canvas myCanvas_;
  ShuntedJTextField delegate_;
}

---------- END SOURCE ----------
(Review ID: 179529)
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