App. for run-time transparency mask creation

[protoemocional]

Hello,


This is a very complex question, and I reckon for the real gurus on the forum.
Before reading the rest of this post, please take a look at the attached image.

Basically, I need a dynamic system of masks to do these things:

1. Display six images of identical dimensions, with different fills and blanks. Fills represent 12% opaqueness, blanks represent full transparency.

2. From the first to the last image, there will be an "adding" effect, which results in the last image incorporating all the opaque fills of the previous images.

3. Hopefully, the filled areas' shapes can be modified at runtime, adding or deleting lines (like in Paint/Photoshop/SketchUp).

If anyone can be pinpoint me on the right track here, you'll save me a lot of precious time.

Thanks for the good will!!

Goodbye...