public Vector2d(Point2d p0, Point2d p1) : base(p1.X - p0.X, p1.Y - p0.Y) { }
public Range2d(Point2d point0, Point2d point1) { m_x = new Range1d(point0.X, point1.X); m_y = new Range1d(point0.Y, point1.Y); }
public Vector2d(Point2d pt) : base(pt.X, pt.Y) { }