BUG: SetPixel() Doesn't Work Properly on a PS Printer

   SetPixel(hPrnDC, 10, 10, RGB(0,0,0));
				

   PatBlt(hPrnDC, 10, 10, 1, 1, BLACKNESS);
				

MORE INFORMATION

Once a pen of thickness greater than 1 (one) is created and selected into the printer's device context and a LineTo() command is called, every call to SetPixel() results in a circle the width of the pen. If a pen of width 0 (zero) or 1 is created and used by the LineTo() command, the lines drawn will be the correct thickness, but the SetPixel() command will still draw with the thickness of the most recently used pen with a width greater than 1 (one).

For example, the following code will draw the first two pixels correctly. After the pen of width 50 is created and selected into the printer's device context, the first call to SetPixel works correctly because LineTo() has not been called yet. The call to SetPixel after the line is drawn results in a circle the thickness of the line. After that, a pen of thickness 1 is created and selected into the device context. The line drawn afterwards is drawn correctly, but both calls to SetPixel() result in thick circles.

Sample Code

   if (StartDoc(hPrnDC,&di) > 0)
   {
      HPEN hPen, hPen2, hOldPen;

      StartPage(hPrnDC);
      hPen = CreatePen(PS_SOLID,1,RGB(0,0,0));
      hOldPen = SelectObject(hPrnDC,hPen);
      SetPixel(hPrnDC,100,10,RGB(0,0,0));
      MoveTo(hPrnDC,220,10);
      LineTo(hPrnDC,700,10);
      SetPixel(hPrnDC,800,10,RGB(0,0,0));

      hPen2 = CreatePen(PS_SOLID,50,RGB(0,0,0));
      SelectObject(hPrnDC,hPen2);
      SetPixel(hPrnDC,100,110,RGB(0,0,0));
      MoveTo(hPrnDC,220,110);
      LineTo(hPrnDC,700,110);
      SetPixel(hPrnDC,800,110,RGB(0,0,0));

      SelectObject(hPrnDC,hPen);
      SetPixel(hPrnDC,100,210,RGB(0,0,0));
      MoveTo(hPrnDC,220,210);
      LineTo(hPrnDC,700,210);
      SetPixel(hPrnDC,800,210,RGB(0,0,0));

      DeleteObject(hPen2);
      DeleteObject(SelectObject(hPrnDC,hOldPen));
      EndPage(hPrnDC);
      EndDoc(hPrnDC);
   }