Microsoft KB Archive/71229

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PRB: Windows Regions Do Not Scale

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Q71229

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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

Keywords : kbOSWinNT350 kbOSWinNT351 kbSDKWin32 kbOSWin95

Issue type : kbprb

Technology : kbWinNTsearch kbWinNTWsearch kbWinNT351xsearch kbWinNT350xsearch kbWinNTW350 kbWinNTW350xsearch kbWinNTW351xsearch kbWinNTW351 kbAudDeveloper kbWin3xSearch kbSDKSearch kbWin32sSearch kbWin32API kbWinSDKSearch kbWinSDK310