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# Copyright (c) 2018-2022, Manfred Moitzi
# License: MIT License
import pathlib
import ezdxf
from ezdxf.document import Drawing
CWD = pathlib.Path("~/Desktop/Outbox").expanduser()
if not CWD.exists():
CWD = pathlib.Path(".")
# ------------------------------------------------------------------------------
# This example shows how to rename layers.
#
# The DXF format is not consistent in storing layer references, the
# layers are mostly referenced by their case-insensitive name, and in
# some entities introduced later, layers are referenced by their handle.
# There is also not a complete overview of where layer references are
# stored, which means that it is not 100% safe to rename layers via
# ezdxf, so in some rare cases renaming layers can corrupt the DXF
# file!
#
# docs: https://ezdxf.mozman.at/docs/tables/layer_table_entry.html#layer
# ------------------------------------------------------------------------------
OLD_LAYER_NAME = "LAYER_1"
NEW_LAYER_NAME = "MOZMAN"
def create_doc() -> Drawing:
doc = ezdxf.new()
layer = doc.layers.add(OLD_LAYER_NAME)
msp = doc.modelspace()
attribs = dict(layer=layer.dxf.name)
msp.add_line((0, 0), (1, 0), dxfattribs=attribs)
msp.add_circle((0, 0), radius=1, dxfattribs=attribs)
msp.add_point((2, 0), dxfattribs=attribs)
return doc
def main():
doc = create_doc()
msp = doc.modelspace()
layer = doc.layers.get(OLD_LAYER_NAME)
layer.rename(NEW_LAYER_NAME)
entities = msp.query(f'*[layer=="{NEW_LAYER_NAME}"]')
assert len(entities) == 3
doc.saveas(CWD / "renamed_layer.dxf")
if __name__ == "__main__":
main()
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