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// ************************************************************************************************
//
// BornAgain: simulate and fit reflection and scattering
//
//! @file Base/Vector/GisasDirection.cpp
//! @brief Implements 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)
//
// ************************************************************************************************
#include "Base/Vector/GisasDirection.h"
#include <cmath>
#include <numbers>
using std::numbers::pi;
R3 vecOfKAlphaPhi(double _k, double _alpha, double _phi)
{
return GisasDirection(_alpha, _phi).declinationVector(_k);
}
R3 vecOfLambdaAlphaPhi(double _lambda, double _alpha, double _phi)
{
return vecOfKAlphaPhi((2 * pi) / _lambda, _alpha, _phi);
}
R3 GisasDirection::declinationVector(double r) const
{
return {r * std::cos(m_alpha) * std::cos(m_phi), -r * std::cos(m_alpha) * std::sin(m_phi),
r * std::sin(m_alpha)};
}
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