def mirror(pivot: Vector, center: Vector, norm: Vector):
base = pivot - center
norm.normalize()
a = copy.deepcopy(base)
a.rotate(Triangle.get_rotate_matrix(norm, 2 / 3 * math.pi))
a = center + a
b = copy.deepcopy(base)
b.rotate(Triangle.get_rotate_matrix(norm, -2 / 3 * math.pi))
b = center + b
return [pivot.get_point(), a.get_point(), b.get_point()]
def test_normalize(self):
d = Vector(1, 2)
d = d.normalize()
self.assertAlmostEqual(d.length(), 1)