polylabel-pyo3 0.1.0

Polylabel algorithm for optimal label centers in polygons (python wheels).

polylabel-pyo3

polylabel-pyo3 lets you calculate the pole of inaccessibility in Python. It's a pyo3 wrapper of polylabel-rs.

Install

pip install polylabel-pyo3

Use

from polylabel_pyo3 import polylabel_ext, polylabel_ext_np

# define an open L-shape
L = [(0,0),(1,0),(1,1),(2,1),(2,2),(0,2)]

polylabel_ext(L, 1.0)
# (0.5, 0.5)

# A version for numpy.ndarray only is slightly faster
import numpy as np
polylabel_ext_np(np.array(L, dtype=np.float), 1.0)
# (0.5, 0.5)

# Note that the optional polylabel center for an L-shape
# is in between its mean of exterior vertices and origin
np.mean(L, axis=0)
# array([1., 1.])

GUI Example

pip install -r examples/requirements.txt
python examples/polylabel_gui.py

Drag your shape with the mouse and observe a momentum based center in grey and polylabel center in green:

Develop

Requirements:

• Rust Toolchain
• Python >=3.6

In a venv or conda env:

pip install maturin -r requirements.txt
pre-commit install

Test

maturin develop
pytest -v

Benchmark

maturin develop --release
pyest benchmark