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# Copyright (c) 2020-2022 Manfred Moitzi
# License: MIT License
import pathlib
import math
import ezdxf
from ezdxf import zoom
from ezdxf.math import UCS
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# use an UCS to place a cube in 3D
#
# docs: https://ezdxf.mozman.at/docs/math/core.html#ucs-class
# tutorial for UCS based transformations: https://ezdxf.mozman.at/docs/tutorials/ucs_transform.html
#
# IMPORTANT: the ezdxf.math.UCS is not identical to the UCSTableEntry in
# the TABLE section, but you can acquire the USC by UCSTableEntry.ucs():
# https://ezdxf.mozman.at/docs/tables/ucs_table_entry.html#ezdxf.entities.UCSTableEntry.ucs
# ------------------------------------------------------------------------------
p = [
(0, 0, 0),
(1, 0, 0),
(1, 1, 0),
(0, 1, 0),
(0, 0, 1),
(1, 0, 1),
(1, 1, 1),
(0, 1, 1),
]
doc = ezdxf.new()
msp = doc.modelspace()
block = doc.blocks.new("block_4m3")
cube = block.add_mesh()
with cube.edit_data() as mesh_data:
mesh_data.add_face([p[0], p[1], p[2], p[3]])
mesh_data.add_face([p[4], p[5], p[6], p[7]])
mesh_data.add_face([p[0], p[1], p[5], p[4]])
mesh_data.add_face([p[1], p[2], p[6], p[5]])
mesh_data.add_face([p[3], p[2], p[6], p[7]])
mesh_data.add_face([p[0], p[3], p[7], p[4]])
mesh_data.optimize()
# Place untransformed cube, don't use the rotation
# attribute unless you really need it, just
# transform the UCS.
blockref = msp.add_blockref(name="block_4m3", insert=(0, 0, 0))
# First rotation about the local x-axis
ucs = UCS().rotate_local_x(angle=math.radians(45))
# same as a rotation around the WCS x-axis:
# ucs = UCS().rotate(axis=(1, 0, 0), angle=math.radians(45))
# Second rotation about the WCS z-axis
ucs = ucs.rotate(axis=(0, 0, 1), angle=math.radians(45))
# Last step transform block reference from UCS to WCS
blockref.transform(ucs.matrix)
zoom.extents(msp)
doc.saveas(CWD / "cube.dxf")
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