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08.27.2008 at 03:40AM PDT, ID: 23681447
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8.0

How does one simulate transparent fills on Win32 GDI (not GDI+, not bitmaps) so that it will also print?

Asked by pvanhelden73 in Delphi Printing, Delphi Programming, Windows MFC Programming

Tags: , , , ,

Hi Experts,

I need a "quick solution" (otherwize I could change to GDI+!) for filling polygons with a transparency factor (alpha channel). Using a specially created brush to roughly simulate transparency is OK. The most important is that it should print correctly, ie. I should be able to paint the fill to a DC without knowing what's already on the DC.

GDI+ has an alpha component for every color, and I think GDI+ uses GDI "under the hood" when interfacing with printer drivers. I've also read that this is simulated with ROP codes, but I can't find any code samples or clear description of how it is done.

I've played around with creating my own brushes, to for instance get a 50% transparency using a 10101010... bitmap, but must be doing something wrong. Does anybody have a code sample for this. (Delphi preferred, but C/C++ is also fine).

Thanks in advance.

Paul.Start Free Trial
 
 
[+][-]08.28.2008 at 12:52AM PDT, ID: 22332374

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[+][-]09.23.2008 at 05:20PM PDT, ID: 22555624

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About this solution

Zones: Delphi Printing, Delphi Programming, Windows MFC Programming
Tags: Microsoft, GDI, Win32, not GDI+, Delphi/C/C++
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Solution Provided By: EE_AutoDeleter
Participating Experts: 1
Solution Grade: A
 
 
 
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