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[RectCollection] advise the user what to do if they want to make a non-manhattan rotation

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Jan Petykiewicz 2026-09-14 21:55:06 -07:00
commit d48c0f2879
1 changed files with 6 additions and 1 deletions
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7
masque/shapes/rect_collection.py
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@ -187,7 +187,12 @@ class RectCollection(Shape):
def rotate(self, theta: float) -> Self: def rotate(self, theta: float) -> Self:
quarter_turns = int(numpy.rint(theta / (pi / 2))) quarter_turns = int(numpy.rint(theta / (pi / 2)))
if not numpy.isclose(theta, quarter_turns * (pi / 2)): if not numpy.isclose(theta, quarter_turns * (pi / 2)):
raise PatternError('RectCollection only supports Manhattan rotations') raise PatternError(
f'RectCollection cannot rotate by {theta!r} radians; only Manhattan rotations (multiples of pi/2) are supported. '
'Explicitly replace the collection with to_polygons(), or call Pattern.polygonize() '
'on the pattern containing it (including referenced child patterns) before transforming, '
'flattening, or computing hierarchical bounds.'
)
turns = quarter_turns % 4 turns = quarter_turns % 4
if turns == 0 or self._rects.size == 0: if turns == 0 or self._rects.size == 0:
return self return self