PRB: Windows Regions Do Not Scale (71229)
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 3.5
- Microsoft Windows NT Workstation 3.51
This article was previously published under Q71229 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.
| Modification Type: | Minor | Last Reviewed: | 2/11/2005 |
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| Keywords: | kbprb KB71229 |
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