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# Copyright (c) 2020-2022, Manfred Moitzi
# License: MIT License
import pathlib
import ezdxf
import matplotlib.pyplot as plt
from ezdxf.addons.drawing import Frontend, RenderContext
from ezdxf.addons.drawing.matplotlib import MatplotlibBackend
from ezdxf.math import global_bspline_interpolation
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows how to export the modelspace by the drawing add-on and the
# Matplotlib backend.
#
# docs: https://ezdxf.mozman.at/docs/addons/drawing.html
# ------------------------------------------------------------------------------
wave = [
(0.0, 0.0),
(0.897597901, 0.78183148),
(1.79519580, 0.97492791),
(2.69279370, 0.433883739),
(3.59039160, -0.43388373),
(4.48798950, -0.97492791),
(5.38558740, -0.78183148),
(6.28318530, 0.0),
]
def main():
doc = ezdxf.new()
msp = doc.modelspace()
s = global_bspline_interpolation(wave)
msp.add_spline(dxfattribs={"color": 2}).apply_construction_tool(s)
fig = plt.figure()
ax = fig.add_axes([0, 0, 1, 1])
backend = MatplotlibBackend(ax)
Frontend(RenderContext(doc), backend).draw_layout(msp)
fig.savefig(CWD / "wave.png", dpi=300)
if __name__ == "__main__":
main()
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