Name: dbT83986 Date: 04/17/99


When using drawLine(x,y,x,y) in XOR mode in an off-screen image,
no pixel is changed. It should change pixel (x,y), just like
fillRect(x,y,1,1) does.

The program below prints

sun.awt.image.BufferedImageGraphics2D
Pixels drawn:
(2,5)

whereas with JDK 1.1.7 it prints

sun.awt.motif.X11Graphics
Pixels drawn:
(2,5)
(7,5)

import java.awt.*;
import java.awt.image.*;
public class DrawLineBug {
  public static void main (String[] args) {
    int width = 10;
    int height = 10;
    Frame auxWindow = new Frame();
    auxWindow.addNotify();
    Image image = auxWindow.createImage(width,height);
    Graphics g = image.getGraphics();
    System.out.println(g.getClass().getName());
    g.setColor(Color.black);
    g.drawLine(2,5,2,5);
    g.setXORMode(Color.blue);
    g.drawLine(7,5,7,5);
    g.dispose();
    int[] pixels = new int[width*height];
    PixelGrabber pg = new PixelGrabber(image,0,0,width,height,pixels,0,width);
    try {
      pg.grabPixels();
    } catch (InterruptedException e) {
      e.printStackTrace();
    }
    System.out.println("Pixels drawn:");
    int background = pixels[0+0*width];
    for (int y = 0; y < height; y++)
      for (int x = 0; x < width; x++)
        if (pixels[x+y*width] != background)
          System.out.println("("+x+","+y+")");
    System.exit(0);
  }
}
(Review ID: 57061)
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