Bisect returns a line that bisects points a and b.

New line from start to end so that l.Pt1(0)==start and l.Pt1(1)==end.

TangentLine takes a Pt1V1 and a parametric t0 and returns a line on the curve at that point, tangent to that point.

DefaultRange checks that.

Small is the value that will be used to compare against 0.

Line in 2D space invoked parametrically.

Range checks if an intersection happened and was within a range.

Intersector finds the points where the interface intersects a line.

Segments links together a series of points and fulfils Curve.