ezdxf

Abstract

This Python package is for creating and modifying DXF documents, regardless of the DXF version. The package supports loading and rewriting DXF file without losing any content except comments. Unknown DXF tags in the document are ignored but kept for rewriting. This behavior allows processing DXF documents that contain data from third-party applications without loosing information.

Quick-Info

ezdxf is a Python package to create new DXF files and read/modify/write existing DXF documents
MIT-License
the intended audience are programmers
requires at least Python 3.8
OS independent
tested with CPython and pypy3
has type annotations and passes mypy --ignore-missing-imports -p ezdxf successful
additional required packages for the core package without add-ons: typing_extensions, pyparsing, numpy, fontTools
read/write/new support for DXF versions: R12, R2000, R2004, R2007, R2010, R2013 and R2018
additional read-only support for DXF versions R13/R14 (upgraded to R2000)
additional read-only support for older DXF versions than R12 (upgraded to R12)
read/write support for ASCII DXF and Binary DXF
retains third-party DXF content
optional C-extensions for CPython are included in the binary wheels, available on PyPI for Windows, Linux and macOS

Included Extensions

Additional packages required for these add-ons are not automatically installed during the basic setup, for more information about the setup & dependencies visit the documentation.

The drawing add-on is a translation layer to send DXF data to a render backend, interfaces to matplotlib, which can export images as PNG, PDF or SVG, and PyQt5 are implemented.
r12writer add-on to write basic DXF entities direct and fast into a DXF R12 file or stream
iterdxf add-on to iterate over DXF entities from the modelspace of huge DXF files (> 5GB) which do not fit into memory
Importer add-on to import entities, blocks and table entries from another DXF document
dxf2code add-on to generate Python code for DXF structures loaded from DXF documents as starting point for parametric DXF entity creation
acadctb add-on to read/write plot style files (CTB/STB)
pycsg add-on for basic Constructive Solid Geometry (CSG) modeling
MTextExplode add-on for exploding MTEXT entities into single-line TEXT entities
text2path add-on to convert text into outline paths
geo add-on to support the __geo_interface__
meshex for exchanging meshes with other tools as STL, OFF or OBJ files
openscad add-on, an interface to OpenSCAD
odafc add-on, an interface to the ODA File Converter to read and write DWG files
hpgl2 add-on for converting HPGL/2 plot files to DXF, SVG and PDF

A simple example:

import ezdxf
from ezdxf import colors
from ezdxf.enums import TextEntityAlignment

# Create a new DXF document.
doc = ezdxf.new(dxfversion="R2010")

# Create new table entries (layers, linetypes, text styles, ...).
doc.layers.add("TEXTLAYER", color=colors.RED)

# DXF entities (LINE, TEXT, ...) reside in a layout (modelspace, 
# paperspace layout or block definition).  
msp = doc.modelspace()

# Add entities to a layout by factory methods: layout.add_...() 
msp.add_line((0, 0), (10, 0), dxfattribs={"color": colors.YELLOW})
msp.add_text(
    "Test", 
    dxfattribs={
        "layer": "TEXTLAYER"
    }).set_placement((0, 0.2), align=TextEntityAlignment.CENTER)

# Save the DXF document.
doc.saveas("test.dxf")

Example for the r12writer, which writes a simple DXF R12 file without in-memory structures:

from random import random
from ezdxf.addons import r12writer

MAX_X_COORD = 1000
MAX_Y_COORD = 1000

with r12writer("many_circles.dxf") as doc:
    for _ in range(100000):
        doc.add_circle((MAX_X_COORD*random(), MAX_Y_COORD*random()), radius=2)

The r12writer supports only the ENTITIES section of a DXF R12 drawing, no HEADER, TABLES or BLOCKS section is present, except FIXED-TABLES are written, than some additional predefined text styles and line types are available.

Installation

Basic installation by pip including the optional C-extensions from PyPI as binary wheels:

pip install ezdxf

Full installation with all dependencies (matplotlib, PySide6) for using the drawing add-on:

pip install ezdxf[draw]

For more information about the setup & dependencies visit the documentation.

Website

https://ezdxf.mozman.at/

Documentation

Documentation of the development version at https://ezdxf.mozman.at/docs

Documentation of the latest release at https://ezdxf.readthedocs.io/

Contribution

The source code of ezdxf can be found at GitHub, target your pull requests to the master branch:

https://github.com/mozman/ezdxf.git

Feedback

Questions and feedback at GitHub Discussions:

https://github.com/mozman/ezdxf/discussions

Questions at Stack Overflow:

Post questions at stack overflow and use the tag dxf or ezdxf.

Issue tracker at GitHub:

http://github.com/mozman/ezdxf/issues

Contact

Please always post questions at the forum or stack overflow to make answers available to other users as well.

[email protected]

Feedback is greatly appreciated.

Manfred

mozman/ezdxf

mozman

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