Function method_of 

pub fn method_of<P>(outcome: &SegmentIntersection<P>) -> Method

The Method implied by a raw segment-intersection outcome.

• SegmentIntersection::Single → Method::Crosses (a proper crossing) — endpoint-touch refinement is applied separately by refine_touch once the segment endpoints are known.
• SegmentIntersection::Collinear → Method::Collinear.
• SegmentIntersection::Disjoint / SegmentIntersection::OutOfRange → Method::Disjoint (no turn should be emitted).

Mirrors the top-level case split in Boost’s get_turn_info (get_turn_info.hpp).