PRB: Object Appears Larger During Visual Editing

ID: Q104791

The information in this article applies to:

• Microsoft OLE Libraries for Windows and Win32s, version 2.0
• Microsoft OLE Libraries, included with:

      - Microsoft Windows NT, versions 3.5 and 3.51
      - Microsoft Windows 95
  

SYMPTOMS

An OLE 2.0 object appears larger during visual editing compared to the loaded state.

CAUSE

The Windows application programming interface (API) LPtoDP is being used to convert the size of the object from MM_HIMETRIC to MM_TEXT. The object is then drawn with the MM_TEXT coordinates as the bounding rectangle.

RESOLUTION

LPtoDP is dependent on the current mapping mode to perform a conversion from logical points to device points. For a more accurate transformation, a function must be written to "manually" convert the units from MM_HIMETRIC to MM_TEXT by using GetDeviceCaps to get the logical pixels per inch for use in the conversion. The OLE2UI library, included with the OLE 2.0 toolkit, already includes several transformation functions to properly convert the units:

   XformWidthInPixelsToHimetric  - Converts an int width into HiMetric

   XformWidthInHimetricToPixels  - Converts an int width from HiMetric

   XformHeightInPixelsToHimetric - Converts an int height into HiMetric
                                   units
   XformHeightInHimetricToPixels - Converts an int height from HiMetric
                                   units
   XformRectInPixelsToHimetric   - Converts a rect into HiMetric units
   XformRectInHimetricToPixels   - Converts a rect from HiMetric units
   XformSizeInPixelsToHimetric   - Converts a SIZEL into HiMetric units
   XformSizeInHimetricToPixels   - Converts a SIZEL from HiMetric units

Additional reference words: 2.00 3.50 4.00 KBCategory: kbole kbprg kbprb KBSubcategory: LeTwoPrs

Last Reviewed: May 17, 1995