def set_open_uniform(self, control_points: Sequence['Vertex'], degree: int = 3) -> None:
"""
Open B-spline with uniform knot vector, start and end at your first and last control points.
"""
self.dxf.flags = 0 # clear all flags
self.dxf.degree = degree
self.control_points = control_points
self.knots = open_uniform_knot_vector(len(control_points), degree + 1)
def test_bspline_basis_vector():
degree = 3
count = 10
knots = list(open_uniform_knot_vector(count, order=degree + 1))
max_t = max(knots)
basis_func = Basis(knots=knots, order=degree + 1, count=count)
for u in (0, 2., 2.5, 3.5, 4., max_t):
basis = bspline_basis_vector(u, count=count, degree=degree, knots=knots)
basis2 = basis_func.basis_vector(u)
assert len(basis) == len(basis2)
for v1, v2 in zip(basis, basis2):
assert isclose(v1, v2)
def make_knots(count, degree):
return tuple(open_uniform_knot_vector(count, order=degree + 1))
def test_open_uniform_knot_order_4():
result = open_uniform_knot_vector(9, 4, normalize=False)
assert len(result) == required_knot_values(9, 4)
assert result == open_uniform_order4
assert open_uniform_knot_vector(9, 4, normalize=True) == _normalize(
open_uniform_order4, 6.0)
def test_open_uniform_knot_order_3():
result = open_uniform_knot_vector(7, 3, normalize=False)
assert len(result) == required_knot_values(7, 3)
assert result == open_uniform_order3
assert open_uniform_knot_vector(7, 3, normalize=True) == _normalize(
open_uniform_order3, 5.0)
def test_open_uniform_knot_order_2():
result = open_uniform_knot_vector(5, 2, normalize=False)
assert len(result) == required_knot_values(5, 2)
assert result == open_uniform_order2
assert open_uniform_knot_vector(5, 2, normalize=True) == _normalize(
open_uniform_order2, 4.0)
def test_open_uniform_knot_order_4():
result = open_uniform_knot_vector(9, 4)
assert len(result) == required_knot_values(9, 4)
assert result == open_uniform_order4
