PRB: Device and TrueType Fonts Rotate Inconsistently

• Microsoft Windows Software Development Kit (SDK) 3.1
• Microsoft Win32 Application Programming Interface (API), used with:
  • Microsoft Windows NT, versions 3.5, 3.51
  • Microsoft Windows 95

SYMPTOMS

In an application for the Microsoft Windows graphical environment that uses a mapping mode other than MM_TEXT and a text alignment other than the default (TA_LEFT, TA_TOP), device fonts and TrueType fonts rotate in the opposite directions. Device fonts may exhibit other unusual behaviors. Differences in rotated text may appear on the screen or in printed output.

RESOLUTION

To create a font that rotates based on the coordinate system in which the font is used, the application must set the CLIP_LH_ANGLES (0x10) bit in the lfClipPrecision field of the LOGFONT data structure. This technique is backward-compatible with Windows 3.0 because the CLIP_LH_ANGLES bit is ignored in version 3.0.

STATUS

This behavior is by design.

Additional query words: rotation lfOrientation lfEscapement nOrientation nEscapement
reverse degrees negative CreateFont

Keywords : kbAPI kbNTOS350 kbNTOS351 kbSDKPlatform kbWinOS95 kbSDKWin16
Version : WINDOWS:3.1,95; winnt:3.5,3.51
Platform : WINDOWS winnt
Issue type : kbprb