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# Copyright (c) 2018-2022, Manfred Moitzi
# License: MIT License
import pathlib
import ezdxf
from ezdxf.render import R12Spline
from ezdxf.math import Vec3, Matrix44, UCS, OCS
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows how to get B-splines in DXF R12 files which does not support
# the SPLINE entity.
#
# docs: https://ezdxf.mozman.at/docs/render/curves.html#r12spline
# ------------------------------------------------------------------------------
next_frame = Matrix44.translate(0, 7, 0)
SEGMENTS = 40
def draw(msp, points, extrusion=None):
dxfattribs = {"color": 1}
if extrusion is not None:
ocs = OCS(extrusion)
points = ocs.points_from_wcs(points)
dxfattribs["extrusion"] = extrusion
for point in points:
msp.add_circle(radius=0.1, center=point, dxfattribs=dxfattribs)
def main(dxfversion="R12"):
doc = ezdxf.new(dxfversion)
msp = doc.modelspace()
spline_points = Vec3.list(
[
(8.55, 2.96),
(8.55, -0.03),
(2.75, -0.03),
(2.76, 3.05),
(4.29, 1.78),
(6.79, 3.05),
]
)
# open quadratic b-spline
draw(msp, spline_points)
msp.add_text(
"Open Quadratic R12Spline", dxfattribs={"height": 0.1}
).set_placement(spline_points[0])
R12Spline(spline_points, degree=2, closed=False).render(
msp, segments=SEGMENTS, dxfattribs={"color": 3}
)
if doc.dxfversion > "AC1009":
msp.add_open_spline(
control_points=spline_points, degree=2, dxfattribs={"color": 4}
)
# open cubic b-spline
spline_points = list(next_frame.transform_vertices(spline_points))
draw(msp, spline_points)
msp.add_text(
"Open Cubic R12Spline", dxfattribs={"height": 0.1}
).set_placement(spline_points[0])
R12Spline(spline_points, degree=3, closed=False).render(
msp, segments=SEGMENTS, dxfattribs={"color": 3}
)
if doc.dxfversion > "AC1009":
msp.add_open_spline(
control_points=spline_points, degree=3, dxfattribs={"color": 4}
)
# closed cubic b-spline
spline_points = list(next_frame.transform_vertices(spline_points))
draw(msp, spline_points)
msp.add_text(
"Closed Cubic R12Spline", dxfattribs={"height": 0.1}
).set_placement(spline_points[0])
R12Spline(spline_points, degree=3, closed=True).render(
msp, segments=SEGMENTS, dxfattribs={"color": 3}
)
# place open cubic b-spline in 3D space
ucs = UCS(
origin=(10, 3, 3), ux=(1, 0, 0), uz=(0, 1, 1)
) # 45 deg rotated around x-axis
assert ucs.is_cartesian
draw(msp, ucs.points_to_wcs(spline_points), extrusion=ucs.uz)
msp.add_text(
"Open Cubic R12Spline in 3D space",
dxfattribs={
"height": 0.1,
"extrusion": ucs.uz,
},
).set_placement(ucs.to_ocs(Vec3(spline_points[0])))
R12Spline(spline_points, degree=3, closed=False).render(
msp, segments=SEGMENTS, ucs=ucs, dxfattribs={"color": 3}
)
filename = CWD / f"spline_{dxfversion}.dxf"
doc.saveas(filename)
print(f"drawing {filename} created.")
if __name__ == "__main__":
main()
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