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# Copyright (c) 2018-2022, Manfred Moitzi
# License: MIT License
import pathlib
from math import radians
import ezdxf
from ezdxf.render.forms import ellipse
from ezdxf.math import basic_transformation
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows how to get ellipses in DXF R12 files which does not support
# the ELLIPSE entity.
#
# docs:
# ellipse: https://ezdxf.mozman.at/docs/render/forms.html#ezdxf.render.forms.ellipse
# basic_transformation: https://ezdxf.mozman.at/docs/math/core.html#ezdxf.math.basic_transformation
# ------------------------------------------------------------------------------
def render(msp, points):
msp.add_polyline2d(list(points))
def tmatrix(x, y, angle):
return basic_transformation((x, y), z_rotation=radians(angle))
def main():
doc = ezdxf.new("R12", setup=True)
msp = doc.modelspace()
for axis in [0.5, 0.75, 1.0, 1.5, 2.0, 3.0]:
render(msp, ellipse(200, rx=5.0, ry=axis))
attribs = {
"color": 1,
"linetype": "DASHDOT",
}
msp.add_line((-7, 0), (+7, 0), dxfattribs=attribs)
msp.add_line((0, -5), (0, +5), dxfattribs=attribs)
for rotation in [0, 30, 45, 60, 90]:
m = tmatrix(20, 0, rotation)
render(msp, m.transform_vertices(ellipse(100, rx=5.0, ry=2.0)))
for startangle in [0, 30, 45, 60, 90]:
m = tmatrix(40, 0, startangle)
render(
msp,
m.transform_vertices(
ellipse(
90,
rx=5.0,
ry=2.0,
start_param=radians(startangle),
end_param=radians(startangle + 90),
)
),
)
render(
msp,
m.transform_vertices(
ellipse(
90,
rx=5.0,
ry=2.0,
start_param=radians(startangle + 180),
end_param=radians(startangle + 270),
)
),
)
filename = CWD / "ellipse_r12.dxf"
doc.saveas(filename)
print(f"drawing {filename} created.")
if __name__ == "__main__":
main()
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