Hi Christoph,
I have filed bug #6889147, it should appear shortly on bugs.sun.com.
This seems to be another problem in the Pisces renderer. It seems to be
valid both for OpenJDK6 and 7. I try to have a look as soon as I find
time.
Thanks, Roman
Am Dienstag, den 06.10.2009, 12:31 +0200 schrieb Dr. Christoph Gille:
> When using setStroke, the pixel is displaced by one position
> I guess that it is a numeric rounding error in 2d.
> The following program demonstrates the error and shows my workaround:
> g.translate(0.001,0.001);
>
>
>
>
> import java.awt.*;
> import javax.swing.*;
>
> /**
> You should see a dashed black-red rectangle.
>
> Without calling translate however, the dashed rectangle is displaced by one
> pixel.
>
> Starting
> java test.Topenjdk
>
> java -version
> java version "1.6.0_0"
> OpenJDK Runtime Environment (build 1.6.0_0-b11)
> OpenJDK Client VM (build 1.6.0_0-b11, mixed mode, sharing)
> */
> public final class Topenjdk extends JComponent {
> boolean bugfixed;
> public static void main(String argv[]) throws Exception {
> for(boolean withWorkaround : new boolean[]{true,false}) {
> final JFrame f=new JFrame(withWorkaround ? "With workaround" : "Bug: rectangles do not coincide ");
> final Topenjdk component=new Topenjdk();
> component.bugfixed=withWorkaround;
> f.getContentPane().add(component);
> f.setLocation(withWorkaround ? 20:0, withWorkaround ? 20:0);
> f.setSize(300,300);
> f.show();
> }
> }
> public void paintComponent(Graphics graphics) {
> final Graphics2D g=(Graphics2D)graphics;
> if (bugfixed) g.translate(0.001,0.001);
> g.setColor(Color.WHITE);
> g.fillRect(0,0,999,999);
> g.setColor(Color.BLACK);
> g.drawRect(10,10,100,100);
> g.setStroke(new BasicStroke(1f,BasicStroke.CAP_ROUND,BasicStroke.JOIN_ROUND,1f,new float[]{12/3f, 12-12/3f},3));
> g.setColor(Color.RED);
> g.drawRect(10,10,100,100);
> if (bugfixed) g.translate(-0.001,-0.001);
> }
> }
>
>
