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# Copyright (c) 2010-2022, Manfred Moitzi
# License: MIT License
import pathlib
import ezdxf
from ezdxf.render import Spline
from ezdxf.math import Vec3, Matrix44
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows how to create SPLINE entities.
#
# tutorial: https://ezdxf.mozman.at/docs/tutorials/spline.html
# ------------------------------------------------------------------------------
def draw(msp, points):
for point in points:
msp.add_circle(radius=0.1, center=point, dxfattribs={"color": 1})
def main():
next_frame = Matrix44.translate(0, 5, 0)
right_frame = Matrix44.translate(10, 0, 0)
spline_points = Vec3.list([(1.0, 1.0), (2.5, 3.0), (4.5, 2.0), (6.5, 4.0)])
doc = ezdxf.new("R2000")
msp = doc.modelspace()
# draw the fit points itself:
draw(msp, spline_points)
# curve with definition points as fit points
Spline(spline_points).render_as_fit_points(
msp, method="distance", dxfattribs={"color": 2}
)
Spline(spline_points).render_as_fit_points(
msp, method="uniform", dxfattribs={"color": 3}
)
# method = distance ^ 1/2
Spline(spline_points).render_as_fit_points(
msp, method="centripetal", dxfattribs={"color": 4}
)
# method = distance ^ 1/3
Spline(spline_points).render_as_fit_points(
msp, method="centripetal", dxfattribs={"color": 6}
)
msp.add_spline(fit_points=spline_points, dxfattribs={"color": 1})
msp.add_text(
"Spline.render_as_fit_points() differs from AutoCAD fit point rendering",
dxfattribs={"height": 0.1},
).set_placement(spline_points[0])
# open uniform b-spline
spline_points = list(next_frame.transform_vertices(spline_points))
draw(msp, spline_points)
msp.add_text(
"Spline.render_open_bspline() matches AutoCAD",
dxfattribs={"height": 0.1},
).set_placement(spline_points[0])
Spline(spline_points).render_open_bspline(
msp, degree=3, dxfattribs={"color": 3}
) # B-spline defined by control points, open uniform knots
msp.add_open_spline(
control_points=spline_points, degree=3, dxfattribs={"color": 4}
)
rbspline_points = list(right_frame.transform_vertices(spline_points))
# uniform b-spline
spline_points = list(next_frame.transform_vertices(spline_points))
draw(msp, spline_points)
msp.add_text(
"Spline.render_uniform_bspline() matches AutoCAD",
dxfattribs={"height": 0.1},
).set_placement(spline_points[0])
Spline(spline_points).render_uniform_bspline(
msp, degree=3, dxfattribs={"color": 3}
) # B-spline defined by control points, uniform knots
spline = msp.add_spline(dxfattribs={"color": 4})
spline.set_uniform(
control_points=spline_points, degree=3
) # has no factory method
# rational open uniform b-spline
spline_points = rbspline_points
weights = [1, 50, 50, 1]
draw(msp, spline_points)
Spline(spline_points).render_open_rbspline(
msp, weights=weights, degree=3, dxfattribs={"color": 3}
) # Rational B-spline defined by control points, open uniform knots
msp.add_rational_spline(
control_points=spline_points,
weights=weights,
degree=3,
dxfattribs={"color": 4},
)
msp.add_text(
"Spline.render_open_rbspline() matches AutoCAD",
dxfattribs={"height": 0.1},
).set_placement(spline_points[0])
filename = CWD / "spline.dxf"
doc.saveas(filename)
print(f"drawing {filename} created.")
if __name__ == "__main__":
main()
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