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Q71229: PRB: Windows Regions Do Not Scale

Article: Q71229
Product(s): Microsoft Windows Software Development Kit
Version(s): WINDOWS:3.1,95; winnt:3.5,3.51
Operating System(s): 
Keyword(s): kbOSWinNT350 kbOSWinNT351 kbSDKWin32 kbOSWin95
Last Modified: 08-AUG-2001

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The information in this article applies to:

- Microsoft Windows Software Development Kit (SDK) 3.1 
- Microsoft Win32 Application Programming Interface (API) 
- Microsoft Windows NT Workstation versions 3.5, 3.51 
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SYMPTOMS
========

The coordinates of Windows regions are in device units, not logical units.
Therefore, if the mapping mode is not MM_TEXT, region coordinates do not scale
as would be expected. This causes particular problems in metafiles because
metafiles often use MM_ISOTROPIC or MM_ANISOTROPIC modes to make pictures appear
the same on devices with different resolutions.

To work around this problem, applications should avoid using regions if the
mapping mode is changed from MM_TEXT. Regions should also be avoided in
metafiles, unless the application knows the scaling factor and can adjust region
coordinates itself.

MORE INFORMATION
================

If the applications that will read and write the metafile are developed
together, the writing application can include an MFCOMMENT escape in the
metafile to store the region components. This information can be used by the
reading application to scale the metafile.

Additional query words: 3.00 3.10 3.50 4.00 win16sdk

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Keywords          : kbOSWinNT350 kbOSWinNT351 kbSDKWin32 kbOSWin95 
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNT351search kbWinNT350search kbWinNTW350 kbWinNTW350search kbWinNTW351search kbWinNTW351 kbAudDeveloper kbWin3xSearch kbSDKSearch kbWin32sSearch kbWin32API kbWinSDKSearch kbWinSDK310
Version           : WINDOWS:3.1,95; winnt:3.5,3.51
Issue type        : kbprb

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