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region: relax assertion to allow zero width/height

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some degenerate cases create regions of zero area, but non-zero
dimensions. eg, vertical linear bezier curves.
This commit is contained in:
Danny Robson 2017-07-28 14:23:20 +10:00
parent 1f337ef964
commit 1248f15e4f
1 changed files with 5 additions and 0 deletions
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region.cpp
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@ -50,6 +50,11 @@ util::region<S,T>::region (point_t _a,
point_t _b):
region (_a, extent_t { _b - _a })
{
// This check must allow for zero area (but non-zero dimension) regions.
// Some code paths need to support this degenerate case. It's ugly but
// simplifies generalisation. eg, vertical linear bezier curves.
CHECK (all (_a <= _b));
debug::sanity (*this);
}