void adjust_for_distance(TrackPosition &, TrackPosition &, float, float = 0.5) const;
TrackPoint get_point(const Vector &, const Vector &, float = 0.5) const;
TrackPoint get_point(const TrackPosition &, float, float = 0.5) const;
void adjust_for_distance(TrackPosition &, TrackPosition &, float, float = 0.5) const;
TrackPoint get_point(const Vector &, const Vector &, float = 0.5) const;
TrackPoint get_point(const TrackPosition &, float, float = 0.5) const;