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# Copyright (c) 2023, Manfred Moitzi
# License: MIT License
import pathlib
import ezdxf
from ezdxf.addons import odafc
from ezdxf.document import Drawing
from ezdxf import xref, units, colors
from ezdxf.render import forms
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows how to attach DXF and DWG files as external references to a
# host document.
# ------------------------------------------------------------------------------
def make_dxf_xref_document(name: str, dxfversion="R2013") -> Drawing:
# AutoCAD does not accept DXF R12 files as XREF :(
ref_doc = ezdxf.new(dxfversion, units=units.M)
ref_doc.layers.add("GEAR", color=colors.YELLOW)
msp = ref_doc.modelspace()
gear = forms.gear(
16, top_width=0.25, bottom_width=0.75, height=0.5, outside_radius=2.5
)
msp.add_lwpolyline(
forms.translate(gear, (5, 5)), close=True, dxfattribs={"layer": "GEAR"}
)
ref_doc.header["$INSBASE"] = (5, 5, 0) # set XREF base point for insertion
ref_doc.saveas(CWD / name)
return ref_doc
# AutoCAD accepts DXF files (>DXF12) as XREFs, but is unwilling to resolve the
# DXF files created by ezdxf, which opened for itself is a total valid DXF
# document.
#
# It seems that AutoCAD does not resolve any DXF file as an XREF file, no matter what
# CAD application created the DXF file!
# The much more friendly BricsCAD has no problem to resolve the DXF files as XREFs.
#
# Export the DXF document as DWG file by the odafc addon, for more information
# see the docs: https://ezdxf.mozman.at/docs/addons/odafc.html
# At least the DWG file is accepted by AutoCAD.
def export_dwg_xref_document(name: str, doc: Drawing) -> None:
dwg = CWD / name
try:
odafc.export_dwg(doc, str(dwg), replace=True)
except odafc.ODAFCError as e:
print(str(e))
def create_xrefs(dxf_name, dwg_name, dxfversion):
xref_doc = make_dxf_xref_document(dxf_name, dxfversion=dxfversion)
export_dwg_xref_document(dwg_name, xref_doc)
def use_add_xref_def(dxf_name: str, dwg_name: str, dxfversion: str) -> None:
# The method before ezdxf v1.1 which will continue to work in the future:
host_doc = ezdxf.new(dxfversion, units=units.M)
msp = host_doc.modelspace()
# create external reference definitions
host_doc.add_xref_def(filename=dxf_name, name="dxf_xref")
host_doc.add_xref_def(filename=dwg_name, name="dwg_xref")
# add external references as block references:
msp.add_blockref(name="dxf_xref", insert=(0, 0))
msp.add_blockref(name="dwg_xref", insert=(10, 0))
# save host document
host_doc.set_modelspace_vport(height=10, center=(5, 0))
host_doc.saveas(CWD / "host_add_xref.dxf")
def use_xref_attach(dxf_name: str, dwg_name: str, dxfversion: str) -> None:
# The new ezdxf.xref module in v1.1 bundles all XREF relates tasks into a single
# module.
host_doc = ezdxf.new(dxfversion, units=units.M)
# create the external reference definition and a default block reference for it:
xref.attach(host_doc, block_name="dxf_xref", filename=dxf_name)
xref.attach(host_doc, block_name="dwg_xref", filename=dwg_name, insert=(10, 0))
# save host document
host_doc.set_modelspace_vport(height=10, center=(5, 0))
host_doc.saveas(CWD / "host_xref_attach.dxf")
def main():
dxfversion = "R2013"
dxf_name = "xref.dxf"
dwg_name = "xref.dwg"
create_xrefs(dxf_name, dwg_name, dxfversion)
# both function do the same:
# 1. uses the method before ezdxf v1.1
use_add_xref_def(dxf_name, dwg_name, dxfversion)
# 2. uses the new xref module in ezdxf v1.1
use_xref_attach(dxf_name, dwg_name, dxfversion)
if __name__ == "__main__":
main()
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