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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Base/Vector/GisasDirection.h
//! @brief Defines class GisasDirection.
//!
//! @homepage http://www.bornagainproject.org
//! @license GNU General Public License v3 or higher (see COPYING)
//! @copyright Forschungszentrum Jülich GmbH 2018
//! @authors Scientific Computing Group at MLZ (see CITATION, AUTHORS)
//
// ************************************************************************************************
#ifdef SWIG
#error no need to expose this header to Swig
#endif // SWIG
#ifndef BORNAGAIN_BASE_VECTOR_GISASDIRECTION_H
#define BORNAGAIN_BASE_VECTOR_GISASDIRECTION_H
#include <heinz/Vectors3D.h>
R3 vecOfKAlphaPhi(double _k, double _alpha, double _phi = 0);
R3 vecOfLambdaAlphaPhi(double _lambda, double _alpha, double _phi = 0);
//! A direction in three-dimensional space, parameterized by GISAS angles alpha_f, phi_f.
class GisasDirection {
public:
GisasDirection(double alpha, double phi)
: m_alpha(alpha)
, m_phi(phi)
{
}
double alpha() const { return m_alpha; }
double phi() const { return m_phi; }
//! Returns Cartesian 3D vector, where alpha, phi parameterize declination away from (r,0,0)
R3 declinationVector(double r) const;
private:
double m_alpha; //!< declination in +z direction
double m_phi; //!< declination in -y direction
};
#endif // BORNAGAIN_BASE_VECTOR_GISASDIRECTION_H
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