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# Copyright (c) 2010-2021, Manfred Moitzi
# License: MIT License
import pathlib
from math import radians
import ezdxf
from ezdxf.render import EulerSpiral
from ezdxf.math import basic_transformation
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows how to use the ezdxf.render.EulerSpiral class.
# The DXF format does not support euler-spirals, therefore they can only be
# approximated by polylines.
#
# docs: https://ezdxf.mozman.at/docs/render/curves.html#eulerspiral
# ------------------------------------------------------------------------------
NAME = "euler_spiral.dxf"
def four_c(msp, curvature, length, rotation):
spiral = EulerSpiral(curvature=curvature)
render(
msp,
spiral,
length,
tmatrix(2, 2, angle=rotation),
dxfattribs={"color": 1},
)
# scaling sx=-1 is mirror about y-axis
render(
msp,
spiral,
length,
tmatrix(2, 2, sx=-1, sy=1, angle=rotation),
dxfattribs={"color": 2},
)
# scaling sy=-1 is mirror about x-axis
render(
msp,
spiral,
length,
tmatrix(2, 2, sx=1, sy=-1, angle=rotation),
dxfattribs={"color": 3},
)
render(
msp,
spiral,
length,
tmatrix(2, 2, sx=-1, sy=-1, angle=rotation),
dxfattribs={"color": 4},
)
def render(msp, spiral, length, matrix, dxfattribs):
spiral.render_polyline(
msp, length, segments=100, matrix=matrix, dxfattribs=dxfattribs
)
spiral.render_spline(
msp,
length,
fit_points=10,
matrix=matrix,
dxfattribs={"color": 6, "linetype": "DASHED"},
)
def tmatrix(dx, dy, sx=1, sy=1, angle=0):
return basic_transformation(
move=(dx, dy), scale=(sx, sy, 1), z_rotation=radians(angle)
)
def main(dxfversion="R2000"):
doc = ezdxf.new(dxfversion, setup=True)
msp = doc.modelspace()
msp.add_line((-20, 0), (20, 0), dxfattribs={"linetype": "PHANTOM"})
msp.add_line((0, -20), (0, 20), dxfattribs={"linetype": "PHANTOM"})
for rotation in [0, 30, 45, 60, 75, 90]:
four_c(msp, 10.0, 25, rotation)
fname = CWD / f"euler_spiral_{dxfversion}.dxf"
doc.saveas(fname)
print(f"created: {fname}")
if __name__ == "__main__":
main()
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