ezdwg 0.3.0

Minimal read-only DWG parser (Rust core + Python API)

ezdwg

Minimal DWG (R14-R2018 / AC1014-AC1032) reader with a Python API inspired by ezdxf. This project is DWG read-focused today and focuses on a simple, friendly API.

Status

• High-level API (ezdwg.read): R14 / AC1014 (experimental), R2000 / AC1015, R2004 / AC1018, R2007 / AC1021, R2010 / AC1024, R2013 / AC1027, R2018 / AC1032
• Raw API (ezdwg.raw): R14 / AC1014 (version detect + object headers), R2000 / AC1015, R2004 / AC1018, R2007 / AC1021, plus native AC1024/AC1027/AC1032 support for object listing and LINE/ARC/LWPOLYLINE decode
• High-level entities: LINE, ARC, LWPOLYLINE, POINT, CIRCLE, ELLIPSE, TEXT, MTEXT, DIMENSION (linear + radius + diameter)
• Additional raw decode: INSERT (+ low-level POLYLINE/VERTEX helpers)
• Output units/angles: high-level API returns ARC angles in degrees

Install

Rust toolchain is required (PyO3 build).

pip install -e .

Plotting (optional):

pip install "ezdwg[plot]"

DWG to DXF conversion (optional, ezdxf backend):

pip install "ezdwg[dxf]"

Quick Start

import ezdwg

doc = ezdwg.read("path/to/file.dwg")
msp = doc.modelspace()

for e in msp.query("LINE LWPOLYLINE ARC CIRCLE ELLIPSE POINT TEXT MTEXT DIMENSION"):
    print(e.dxftype, e.handle, e.dxf)

Plot in matplotlib:

import ezdwg

doc = ezdwg.read("path/to/file.dwg")
doc.plot(types="ARC", arc_segments=96)

CLI

ezdwg --version
ezdwg inspect examples/data/line_2000.dwg
python -m ezdwg inspect examples/data/line_2000.dwg
ezdwg convert examples/data/line_2000.dwg /tmp/line_2000_out.dxf
ezdwg convert examples/data/arc_2000.dwg /tmp/arc_2000_out.dxf --types "ARC" --dxf-version R2010

DWG to DXF

ezdxf is used as the DXF writing backend.

import ezdwg

result = ezdwg.to_dxf(
    "examples/data/line_2000.dwg",
    "/tmp/line_2000_out.dxf",
    types="LINE ARC LWPOLYLINE",
    dxf_version="R2010",
)
print(result)

Or from an already opened document/layout:

doc = ezdwg.read("examples/data/line_2000.dwg")
doc.export_dxf("/tmp/line_2000_out.dxf")

Examples

Sample DWG files are available under examples/data/.

python examples/basic_read.py
python examples/query_types.py
python examples/plot.py
python examples/text_mtext.py
python examples/dimensions.py
python examples/raw_insert_2004.py
python examples/convert_to_dxf.py

Low-Level API

If you need raw decode access:

from ezdwg import raw

raw.decode_line_entities("path/to/file.dwg")

Limitations

• Read‑only
• High-level API supports R14 (AC1014, experimental), R2000 (AC1015), R2004 (AC1018), R2007 (AC1021), R2010 (AC1024), R2013 (AC1027), and R2018 (AC1032)
• AC1014 currently has stable version detection/object-header listing; entity geometry decoding coverage is limited
• AC1021/AC1024/AC1027/AC1032 use native decode for LINE/ARC/LWPOLYLINE/POINT/CIRCLE/ELLIPSE and are regression-tested against paired DXF samples
• TEXT/MTEXT/DIMENSION decoders now use version-aware common header paths internally; R2007+ dedicated sample regression coverage is still pending
• AC1021/AC1024/AC1027/AC1032 entity style/layer color resolution is currently best-effort on some files
• Legacy POLYLINE/VERTEX/SEQEND samples are not yet covered in AC1018 test data
• ARC angles in raw API are radians (high‑level API converts to degrees)