Module polygon 

Enums

PolygonClass

Functions

area_term

One oriented shoelace term (twice the edge’s area contribution).

classify

Boundary band followed by form-K parity. Keep the caller’s segment guard.

crosses_ray

Form-K horizontal-ray crossing; operand order is shared with the trim indexes.

parity_inside

Even-odd parity over a closed polygon, including its closing edge.

signed_area_2d

twice_signed_area_2d