Rectangle subtraction

Hi,

Ik need to write a program to determine the rectangluar spaces in a door.
The door is built of rectangular pieces of wood.

To solve this i thought the following:
I have one rectangle (width / height of the door) and subtract all pieces of
wood, there's a array of rectangles left, which are the needed rectangles.

I have a poor math knowledge, so any help would be fine.

Thanks,

Perry




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