Returns a version of a scaled to be a unit vector (within rounding error).
The current version tries to handle infinite coordinates gracefully, but it's not clear that any callers need that.
Neither coordinate is NaN.
Definition at line 121 of file point.cpp.
References Geom::Point::normalize(), and unit_vector().
Referenced by darray_left_tangent(), darray_right_tangent(), generate_bezier(), and unit_vector().