BUG: ROP2 Code Applied Incorrectly in Pie() Function

• Microsoft Windows Software Development Kit (SDK) for Windows version 3.1

SYMPTOMS

When calling the Windows SDK function Pie() using a ROP2 code other than the default R2_COPYPEN, and using a pen with a width greater than 1 (one), you may notice that the pie border is not drawn correctly.

CAUSE

The pen position is applied incorrectly and overlaps part of the interior.

STATUS

Microsoft has confirmed this to be a bug in Windows version 3.1. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

MORE INFORMATION

For a demonstration of this bug, run the sample program SHOWGDI that comes with the Windows 3.1 SDK or with Microsoft Visual C++. Set the pen width to greater than 1 and make sure that the pen color and brush color are different. For example, set the pen width to 5 and the pen color to RGB(0,255,0). Set the brush color to RGB(255,0,255). Set the ROP2 code to R2_XORPEN and then draw a pie. You will see three color ranges. The pen position is applied incorrectly and overlaps part of the interior.