poly-check-b

Poly-Check-B

Poly-Check-B is a lightweight, dependency-free Python library for validating and analyzing simple 2D polygons. It answers common geometry questions: Is this polygon simple? Convex? Clockwise? Degenerate?

Features

• Self-intersection (simplicity) detection
• Convexity and orientation checks (CW/CCW)
• Duplicate and collinear-vertex detection
• Signed area and perimeter computation
• Point-in-polygon testing
• Pure Python, zero external dependencies

Install

pip install poly-check-b

Usage

from poly_check_b import Polygon

square = Polygon([(0, 0), (4, 0), (4, 4), (0, 4)])

print(square.is_simple())     # True
print(square.is_convex())     # True
print(square.orientation())   # ccw
print(square.area())          # 16.0
print(square.contains(2, 2))  # True

bowtie = Polygon([(0, 0), (2, 2), (2, 0), (0, 2)])
print(bowtie.is_simple())     # False
print(bowtie.errors())        # ['self-intersection at (1.0, 1.0)']

License

MIT