def test_bsplineu_points():
curve = open_uniform_bspline(DEFPOINTS, order=3)
points = list(curve.approximate(40))
for rpoint, epoint in zip(points, iter_points(DBSPLINEU, 0)):
epx, epy, epz = epoint
rpx, rpy, rpz = rpoint
assert isclose(epx, rpx)
assert isclose(epy, rpy)
assert isclose(epz, rpz)
def test_rbsplineu():
curve = open_uniform_bspline(DEFPOINTS, order=3, weights=DEFWEIGHTS)
expected = RBSPLINEU
points = list(curve.approximate(40))
for rpoint, epoint in zip(points, expected):
epx, epy, epz = epoint
rpx, rpy, rpz = rpoint
assert isclose(epx, rpx)
assert isclose(epy, rpy)
assert isclose(epz, rpz)
def render_uniform_bspline(
self, layout: "BaseLayout", degree: int = 3, dxfattribs: dict = None
) -> None:
"""Render a uniform B-spline as 3D :class:`~ezdxf.entities.Polyline`.
Definition points are control points.
Args:
layout: :class:`~ezdxf.layouts.BaseLayout` object
degree: degree of B-spline (order = `degree` + 1)
dxfattribs: DXF attributes for :class:`~ezdxf.entities.Polyline`
"""
spline = open_uniform_bspline(self.points, order=degree + 1)
layout.add_polyline3d(
list(spline.approximate(self.segments)), dxfattribs=dxfattribs
)
def dbsplineu():
curve = open_uniform_bspline(DEFPOINTS, order=3)
return list(curve.derivatives(curve.params(40)))