def test_normal_vector(self, a: Point):
if isclose(abs(a), 0.0):
with pytest.raises(ZeroDivisionError):
a.normal()
else:
angle = a.normal().angle() - a.angle()
assert isclose(angle, np.pi / 2.0)
def test_unit_vector(self, x: float, y: float):
a = Point(x, y)
if isclose(abs(a), 0.0):
with pytest.raises(ZeroDivisionError):
a.unit_vector()
else:
b = a.unit_vector()
note(f"angle of a: {np.format_float_scientific(a.angle())}")
note(f"angle of b: {np.format_float_scientific(b.angle())}")
assert isclose(a.angle(), b.angle())
note(f"magnitude of b: {abs(b)}")
assert isclose(abs(b), 1.0)
def test_rotation(self, a: Point, angle: Angle, center: Point):
assume(abs(a - center) != 0)
b = a.rotate(angle, center)
new_angle = (b - center).angle() - (a - center).angle()
note(angle)
note(new_angle)
assert isclose(angle, angle)
def test_rotation_about_zero(self, a: Point, angle: Angle):
assume(abs(a) != 0)
b = a.rotate(angle, Point(0.0, 0.0))
aa = a.angle()
bb = b.angle()
note(f"a angle: {aa}")
note(f"b angle: {bb}")
assert isclose(bb - aa, angle)