[Solved] Polygons with user-defined appearance.

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Here is a sample project

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Yes, it was very good that you gave the concise explanation first and then gave an example. Thanks to you, I'll put the Tetris pieces in place a little easier. I hope I can handle the rest myself.
It is worth mentioning;
My impression when running the demos. How sad that we are not aware of the existence of a graphic treasure at our disposal.
I think you're the superman of the graphic world. Thank you for the tremendous work and effort you put into creating BGRA.

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Glad that the explanation and example will help you start 

I did put a lot of effort in this library. It is true that the documentation is not very much complete. Now that I am thinking, maybe it could be worth adding those examples in the wiki, at least a summary or something.

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Yes, what has been done at BGRA is beyond our dreams.
BGRA needs a good showcase face and detailed documentation. Otherwise, he will disappear in the flow of life like a genius child in a home for the orphans...

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Yes, I did not have much time to document things. I was hoping to get help from the community.

Here I made a draft for the bgraaggpas folder projects:
https://wiki.freepascal.org/BGRABitmap_AggPas

At least one can have a quick look at those beautiful projects 

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At least one can have a quick look at those beautiful projects 

Yes, I was one of those peeking. Thank you also for this useful work. Health to your hands.