PRB: Windows Regions Do Not Scale

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

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 : kbNTOS350 kbNTOS351 kbSDKWin32 kbWinOS95
Version : WINDOWS:3.1,95; winnt:3.5,3.51
Platform : WINDOWS winnt
Issue type : kbprb