sean-spark / ezdxf

Python interface to DXF

ezdxf

Abstract

A Python package to create and modify DXF drawings, independent of the DXF version. You can open/save every DXF file without losing any content (except comments), Unknown tags in the DXF file will be ignored but preserved for saving. With this behavior it is possible to open also DXF drawings that contains data from 3rd party applications.

Quick-Info

• ezdxf is a Python package to create new DXF files and read/modify/write existing DXF files
• the intended audience are developers
• requires at least Python 3.7
• OS independent
• tested with CPython and pypy3
• C-extensions for CPython as binary wheels available on PyPI for Windows, Linux and macOS
• additional required packages: pyparsing
• optional Cython implementation of some low level math classes
• MIT-License
• read/write/new support for DXF versions: R12, R2000, R2004, R2007, R2010, R2013 and R2018
• additional read support for DXF versions R13/R14 (upgraded to R2000)
• additional read support for older DXF versions than R12 (upgraded to R12)
• read/write support for ASCII DXF and Binary DXF
• preserves third-party DXF content

Included Extensions

• 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.
• geo add-on to support the __geo_interface__
• 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 of the modelspace of really big (> 5GB) DXF files 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
• Plot Style Files (CTB/STB) read/write add-on

A simple example:

import ezdxf

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

# Create new table entries (layers, linetypes, text styles, ...).
doc.layers.new('TEXTLAYER', dxfattribs={'color': 2})

# 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': 7})
msp.add_text(
    'Test', 
    dxfattribs={
        'layer': 'TEXTLAYER'
    }).set_pos((0, 0.2), align='CENTER')

# Save 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, PyQt5) to use 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 development version at https://ezdxf.mozman.at/docs

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

Contribution

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

http://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