Fast, exact 2D geometry for Python
Documentation ·
Installation ·
Examples ·
License and notices
planex2d is free software under the GNU Lesser General Public License, version 2.1 or (at your option) any later version. Its compiled module contains code from Eigen, pybind11 and Taskflow; its OpenCASCADE bindings, the package planex2d-occ, are linked to Netgen and Open CASCADE Technology and make use of facilities provided by the Open CASCADE Technology software. See License and notices and THIRD_PARTY_NOTICES.md.
What it is
planex2d is a 2D geometry kernel for Python, written in C++. You draw outlines from lines, arcs, circles and splines, combine them with exact Boolean operations, dimension them with constraints, and clean up drawings imported from other tools. The resulting faces go to OpenCASCADE, netgen/NGSolve, gmsh and other tools for 3D modeling, meshing and simulation.
Installation
pip install planex2d # the core: sketches, faces, Booleans, drawings, files
pip install "planex2d[occ]" # with the OpenCASCADE bindings and netgen
The quotes keep shells like zsh, the default on macOS, from reading the brackets as a file pattern.
planex2d comes as wheels for Linux (x86_64 and aarch64) and macOS (Apple silicon and Intel, macOS 13.3 or newer), for
Python 3.11 to 3.14; Windows follows with version 0.2.1. The core runs on numpy alone. The extra occ installs
planex2d-occ, the OpenCASCADE bindings built for the last netgen releases (on Linux x86_64 and macOS, where netgen has
wheels), and netgen with it; planex picks the bindings for the installed netgen. The package is called planex2d on
PyPI and planex in Python (import planex as px). See
Installation for the optional packages and for building from source
(a C++20 compiler, CMake; Xcode 16 on macOS).
A first sketch
A QuickSketch draws with a pen: Line draws along the current direction, Turn changes the direction, Arc
continues with a tangent arc, and Close joins the outline to its start. Circle adds a hole. The result is an angle
bracket with an inner fillet and two holes.
import planex as px
bracket = px.QuickSketch()
bracket.Line(60).Turn(90).Line(10).Turn(90).Line(40)
bracket.Arc(10, -90).Line(30).Turn(90).Line(10).Close()
bracket.Circle((45, 5), 2.5).Circle((5, 35), 2.5)
face = px.Face(bracket.Wires())
face.Plot()
Where to go next
- Quick sketches and constraint sketches: drawing, and dimensions and relations that a solver keeps satisfied.
- Boolean operations, measuring and cleaning up imported drawings.
- Files: DXF, KiCad, SVG, STEP and more.
- OpenCASCADE and netgen/NGSolve: from faces to solids, meshes and simulations.
- Examples: mechanisms, machines, fields and manufacturing.
- Benchmarks: planex2d next to OpenCASCADE and polygon libraries on the same tasks.
License
planex2d is Copyright (C) 2026 Sebastian Hirnschall.
planex2d is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version.
planex2d is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License, the file LICENSE, for more details. The third-party notices are in THIRD_PARTY_NOTICES.md and on the page License and notices.
2 maintainers
Metadata
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Release files for planex2d 0.2.0
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Total release size: 69.4 MB
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