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# Copyright (c) 2021-2022, Manfred Moitzi
# License: MIT License
import pathlib
import ezdxf
from ezdxf.document import Drawing
from ezdxf.lldxf.types import dxftag
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
def add_graphic_entity_to_root_dict(doc: Drawing):
msp = doc.modelspace()
line = msp.add_line((0, 0), (1, 0))
# Question: is it possible to store graphical entities which reside in a
# layout in the root dictionary (Autodesk term: the named dictionary)
# doc.rootdict["LINE"] = line # this does not work for v0.17 as consequence!
# HACK HACK HACK!!! - DO NOT USE HANDLES IN PRODUCTION CODE!
doc.rootdict["LINE"] = line.dxf.handle
# BricsCAD opens the file but AUDIT complaints:
# Name: AcDbDictionary(A)
# Value: Duplicate ownership of reference (2F)
# Validation: Invalid
# Default value: Removed
# TrueView 2021 opens the file - AUDIT command is not available
#
# "2F" is the handle of the LINE entity.
# The error message means the LINE entity can only have one owner and that
# is the layout the entity resides in. A dictionary is also the owner of its
# entries, which leads to conflict shown above.
#
# Consequence: ezdxf v0.17 can not add graphical entities to dictionaries
def reference_graphic_entities_in_extension_dictionaries(doc):
# The extension dictionary is a DICTIONARY object and cannot reference
# directly graphical entities (see function add_graphic_entity_to_root_dict()).
# A XRECORD object is not a graphical entity and can store arbitrary data
# and is therefore a good choice to attach data to a graphical entity by an
# extension dictionary.
msp = doc.modelspace()
line = msp.add_line((0, 0), (1, 0))
line1 = msp.add_line((0, 1), (1, 1))
line2 = msp.add_line((0, 2), (1, 2))
# Attach references to line1 and line2 to the line entity:
ext_dict = line.new_extension_dict()
xrecord = ext_dict.add_xrecord("LINK_CONTAINER")
# The group code 360 is used in DICTIONARY to store handles to linked
# objects and seems to be a good choice:
xrecord.tags.append(dxftag(360, line1.dxf.handle))
xrecord.tags.append(dxftag(360, line2.dxf.handle))
def main():
doc = ezdxf.new()
add_graphic_entity_to_root_dict(doc)
reference_graphic_entities_in_extension_dictionaries(doc)
doc.saveas(CWD / "dictionary.dxf")
if __name__ == "__main__":
main()
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