title: How to introduce semi-transparent rect in Delphi TCanvas?
body: <p>I had a source code of a drawing software from somewhere which was written in Delphi 7. The code is pretty code and big. Everything drawing with that software is solid, no transparency. I try to read most of the code and I found that the main component used for drawing is TCanvas. Is there any easy way to setup the TCanvas so that transparency is allowed? Thanks.</p>