Function line_line2

pub fn line_line2(
    left: Line2,
    right: Line2,
    tolerance: Tolerance,
) -> Result<LineLineIntersection2, LinearIntersectionError>

Classify two unbounded planar lines.

tolerance governs the residual acceptance of the computed point, not the topological parallel/coincident decision: that decision uses certified orientation predicates so it cannot be flipped by a scaled epsilon.