def getUnitNormalVector(p1, p2):
(x1, y1), (x2, y2) = p1, p2
dx, dy = float(x2 - x1), float(y2 - y1)
unitNormal = Vec2D(-dy, dx)
unitNormal.normalize()
return unitNormal
def test_vec2_nan():
nan = float("nan")
inf = float("inf")
assert not Vec2F(0, 0).is_nan()
assert not Vec2F(1, 0).is_nan()
assert Vec2F(nan, 0).is_nan()
assert Vec2F(0, nan).is_nan()
assert Vec2F(nan, nan).is_nan()
assert Vec2F(-nan, 0).is_nan()
assert Vec2F(-nan, nan).is_nan()
assert Vec2F(inf, nan).is_nan()
assert not Vec2F(inf, 0).is_nan()
assert not Vec2F(inf, inf).is_nan()
assert not Vec2F(-inf, 0).is_nan()
assert not Vec2D(0, 0).is_nan()
assert not Vec2D(1, 0).is_nan()
assert Vec2D(nan, 0).is_nan()
assert Vec2D(0, nan).is_nan()
assert Vec2D(nan, nan).is_nan()
assert Vec2D(-nan, 0).is_nan()
assert Vec2D(-nan, nan).is_nan()
assert Vec2D(inf, nan).is_nan()
assert not Vec2D(inf, 0).is_nan()
assert not Vec2D(inf, inf).is_nan()
assert not Vec2D(-inf, 0).is_nan()
def test_vec2_str():
assert str(Vec2F(2, 3)) == "LVector2f(2, 3)"
assert str(Vec2D(2, 3)) == "LVector2d(2, 3)"