How to let gdi/gid+ object (pen\brush\rect\region

Question

I want draw multi layer in DC. each layer have some gdi/gdi+ object and semi-transparent with the underlayer.

Answer 1

Using the function SetROP2 with the argument R2_MASKPEN is a very simple way to get a transparent pen effect.

Answer 2

you need to use the ARGB system for coloring. A represents transparency, it takes a value between 0 and 255. a value of 125 is semi transparant