def spline_insert_knot():
doc = ezdxf.new("R2000", setup=True)
msp = doc.modelspace()
def add_spline(control_points, color=3, knots=None):
msp.add_polyline2d(control_points,
dxfattribs={
"color": color,
"linetype": "DASHED"
})
msp.add_open_spline(control_points,
degree=3,
knots=knots,
dxfattribs={"color": color})
control_points = Vec3.list([
(0, 0),
(10, 20),
(30, 10),
(40, 10),
(50, 0),
(60, 20),
(70, 50),
(80, 70),
])
add_spline(control_points, color=3, knots=None)
bspline = BSpline(control_points, order=4)
bspline.insert_knot(bspline.max_t / 2)
add_spline(bspline.control_points, color=4, knots=bspline.knots())
doc.saveas("Spline_R2000_spline_insert_knot.dxf")
def test_normalize_knots_if_needed():
s = BSpline(
control_points=DEFPOINTS,
knots=[2, 2, 2, 2, 3, 6, 6, 6, 6],
order=4,
)
k = s.knots()
assert k[0] == 0.0
from typing import cast
from pathlib import Path
import ezdxf
from ezdxf.math import Vector, BSpline
DIR = Path('~/Desktop/Outbox').expanduser()
doc = ezdxf.readfile('../../examples/addons/drawing/test_files/hatches_2.dxf')
msp = doc.modelspace()
hatch = cast('Hatch', msp.query('HATCH').first)
if hatch:
for edge in hatch.paths[0].edges:
if edge.EDGE_TYPE == 'SplineEdge':
s = BSpline(control_points=edge.control_points,
knots=edge.knot_values,
order=edge.degree + 1)
print(s.knots())
c = s.to_nurbs_python_curve()
print(c.knotvector)
print(s)
print(list(s.approximate(10)))