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Last active December 29, 2021 18:37
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subtractBox.hs
subtractBox1 :: Box n -> Box n -> [Box n]
subtractBox1 b1 b2 =
case intersectBox b1 b2 of
Nothing -> [b2]
Just i -> subtractBox' i b2
-- | Worker for 'subtractBox'
subtractBox' :: Box n -> Box n -> [Box n]
subtractBox' Pt Pt = []
subtractBox' (i@(Seg x y) :* is) (Seg c d :* ys)
= [Seg c x :* ys | c < x] ++
[Seg y d :* ys | y < d] ++
map (i :*) (subtractBox' is ys)
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