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[pygame] substract rects

Hi,

has anyone written code to substract rects yet?
I could do it myself but don't want to reinvent the wheel.
I didn't find it on the Code Repository.

The exact problem: I have a Level class, and each Level has a
number of Backgrounds, with associated Rects. Everywhere where
the user has not defined a Background (using the Level editor),
an area with a associated black image will be created. Thus:

a level is created with Rect(0, 0, 1000, 1000).
A background tile is configured for Rect(100, 100, 800, 800).
Rect(0, 0, 1000, 1000) - Rect(100, 100, 800, 800) == \
    [Rect(0, 0, 900, 100), Rect(900, 0, 100, 900),
     Rect(0, 100, 100, 900), Rect(100, 900, 100, 900)]

...so that the rest of the screen is filled with other rects.
Has anyone ever done that?
If not and I write it, I'll share it in the PCR.

regards,
Gerrit.

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