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# Copyright (c) 2022, Manfred Moitzi
# License: MIT License
from pathlib import Path
import ezdxf
from ezdxf.render import forms
CWD = Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = Path(".")
# ------------------------------------------------------------------------------
# This example shows how to use the ezdxf.forms.extrude method to create a prism
# from a concave base polygon. The added face-normals show if the face-orientation
# follows the usual count-clockwise order to build outside pointing faces.
#
# docs: https://ezdxf.mozman.at/docs/render/forms.html#ezdxf.render.forms.extrude
# ------------------------------------------------------------------------------
def main(filepath):
doc = ezdxf.new()
msp = doc.modelspace()
profile = [(0, 0), (10, 0), (10, 10), (8, 10), (8, 2), (0, 2)]
concave_prism = forms.extrude(
profile, [(0, 0, 0), (0, 0, 10)], close=True, caps=True
)
concave_prism.render_mesh(msp, dxfattribs={"color": 2})
concave_prism.render_normals(msp, dxfattribs={"color": 6})
# tessellate prism into triangles:
triangle_mesh = concave_prism.mesh_tessellation(3)
triangle_mesh.translate(20, 0, 0)
triangle_mesh.render_mesh(msp, dxfattribs={"color": 1})
triangle_mesh.render_normals(msp, dxfattribs={"color": 6})
doc.saveas(filepath)
if __name__ == "__main__":
main(CWD / "concave_prism.dxf")
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