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Add Vector.zero as a class-level attribute #168

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Merged
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Oct 26, 2021
Merged

Add Vector.zero as a class-level attribute #168

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6 changes: 6 additions & 0 deletions ppb_vector/__init__.py
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Original file line number Diff line number Diff line change
Expand Up @@ -65,6 +65,9 @@ class Vector:
x: float
y: float

# Class-level attributes
zero: typing.ClassVar['Vector']

__match_args__ = ('x', 'y')

# Tell CPython that this isn't an extendable dict
Expand Down Expand Up @@ -574,4 +577,7 @@ def reflect(self, surface_normal: VectorLike) -> 'Vector':
return self - (2 * (self * surface_normal) * surface_normal)


Vector.zero = Vector(0, 0)


Sequence.register(Vector)
5 changes: 5 additions & 0 deletions tests/test_zero.py
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@@ -0,0 +1,5 @@
from ppb_vector import Vector


def test_zero():
assert not Vector.zero