Function Dual

TSConformal2D.h:480–483

	/// \related RoundPoint2D

	inline Circle2D Dual(const RoundPoint2D& a)
	{
		return (Circle2D(-a.z, a.x, a.y, -a.w));
	}

	/// \brief Returns the dual of the 2D dipole $d$, which is a 2D dipole.
	/// \related Dipole2D