Vector2D
- struct HPS.Vector2D
- Public Functions - override bool Equals (object obj)
 - bool Equals (Point2D p)
 - bool Equals (Vector2D p)
 - override int GetHashCode ()
 - double Length ()
 - double LengthSquared ()
 - float Magnitude ()
 - float Manhattan ()
 - Vector2D Normalize (float epsilon)
 - Vector2D (float in_x, float in_y)
 - Vector2D (Plane2D p)
 - Vector2D (Point2D p)
 - Vector2D (Vector v)
 - Vector2D (Vector2D v)
 - Public Static Functions 
