KnowledgeBase Archive

An Archive of Early Microsoft KnowledgeBase Articles

View on GitHub

Q39802: INFO: Limit of Logical Coordinate System in Windows

Article: Q39802
Product(s): Microsoft Windows Software Development Kit
Version(s): WINDOWS:3.1
Operating System(s): 
Keyword(s): kb16bitonly kbSDKWin16
Last Modified: 17-JUN-1999

3.00
WINDOWS
kbprg

-------------------------------------------------------------------------------
The information in this article applies to:

- Microsoft Windows Software Development Kit (SDK) 3.1 
-------------------------------------------------------------------------------

SUMMARY
=======

The limits of the logical coordinate system are from -32768 to +32767. An item
can be drawn anywhere within this coordinate system; however, the window extent
cannot be set to greater than 32767. (Although this might seem to limit the
system to the -16384 to 16383 range, this is not the case.) If the viewport and
window are set up properly, everything will be shown. For example, to set up the
whole logical coordinate system to be shown within the application's area of the
screen, the following code works properly:

     /*  Establish viewport to be upper-left quarter of client area */ 

     GetClientRect(hWnd, (LPRECT) &CRect);
     SetViewportOrg(hDC, 0, 0);
     SetViewportExt(hDC, (CRect.right - CRect.left) / 2, \ 

                        (CRect.bottom - CRect.top) / 2);

     /*  Set Window Origin and Extent such that total logical */ 
     /*     coordinate system will cover entire client area   */ 

     SetWindowOrg(hDC, -32767, -32767);
     SetWindowExt(hDC, 32767, 32767);

Additional query words: mapping modes anisotropic isotropic

======================================================================
Keywords          : kb16bitonly kbSDKWin16 
Technology        : kbAudDeveloper kbWin3xSearch kbSDKSearch kbWinSDKSearch kbWinSDK310
Version           : WINDOWS:3.1
Issue type        : kbinfo

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY.