Kernel::ConstructPerpendicularVector

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Kernel::ConstructPerpendicularVector_2

A model for this must provide:

Kernel::Vector_2 fo.operator() ( Kernel::Vector_2 v, Orientation o)
returns v rotated clockwise by 90 degrees, if o is CLOCKWISE, and rotated counterclockwise otherwise.
Precondition: o is not COLLINEAR.

AdaptableFunctor (with two arguments)

Kernel::Vector_2	fo.operator() ( Kernel::Vector_2 v, Orientation o)
		returns v rotated clockwise by 90 degrees, if o is CLOCKWISE, and rotated counterclockwise otherwise. Precondition: o is not COLLINEAR.