def test_flattening():
curve = Bezier([(0, 0), (1, 1), (2, -1), (3, 0)])
assert len(list(curve.flattening(1.0, segments=4))) == 5
assert len(list(curve.flattening(0.1, segments=4))) == 7
def test_reverse():
curve = Bezier(DEFPOINTS3D)
new = curve.reverse()
assert curve.control_points[0] == new.control_points[-1]
def test_transform_interface():
curve = Bezier(DEFPOINTS3D)
new = curve.transform(Matrix44.translate(1, 2, 3))
assert new.control_points[0] == curve.control_points[0] + (1, 2, 3)
def dbezier():
curve = Bezier(DEFPOINTS3D)
return list(curve.derivatives(curve.params(40)))
def test_points_3d():
bcurve = Bezier(DEFPOINTS3D)
points = list(bcurve.approximate(40))
for point, chk in zip(points, iter_dbezier(DBEZIER3D, 0)):
assert point.isclose(chk)
def test_point_and_tangent_2d():
dbcurve = Bezier(DEFPOINTS2D)
for index, (chk_pnt, chk_d1) in enumerate(zip(POINTS2D, TANGENTS2D)):
pnt, d1, d2 = dbcurve.derivative(index * .1)
assert pnt.isclose(chk_pnt)
assert d1.isclose(chk_d1)
def test_bezier_objects_are_immutable():
curve = Bezier(DEFPOINTS3D)
with pytest.raises(TypeError):
curve.control_points[0] = (1, 2, 3)
def test_points_2d():
bcurve = Bezier(DEFPOINTS2D)
for index, chk in enumerate(POINTS2D):
assert bcurve.point(index * .1).isclose(chk)
