GravitySANSHelper.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2009 ISIS Rutherford Appleton Laboratory UKRI,
//   NScD Oak Ridge National Laboratory, European Spallation Source,
//   Institut Laue - Langevin & CSNS, Institute of High Energy Physics, CAS
// SPDX - License - Identifier: GPL - 3.0 +
#pragma once
 
#include "MantidKernel/V3D.h"
 
namespace Mantid {
namespace API {
class SpectrumInfo;
}
namespace Algorithms {
class GravitySANSHelper {
public:
  GravitySANSHelper() : m_beamLineNorm(-1), m_dropPerAngstrom2(-1), m_cachedDrop(-1) {}
  GravitySANSHelper(const API::SpectrumInfo &spectrumInfo, const size_t index, const double extraLength = 0.0);
  double calcSinTheta(const double wavAngstroms) const;
  double calcComponents(const double wavAngstroms, double &xFrac, double &yFrac) const;
 
  double gravitationalDrop(const double wav) const { return m_dropPerAngstrom2 * wav * wav; }
 
private:
  Kernel::V3D m_samplePos;
  Kernel::V3D m_beamLine;
  double m_beamLineNorm;
 
  double m_dropPerAngstrom2;
  mutable Kernel::V3D m_cachedLineOfSight;
  mutable double m_cachedDrop;
 
  const Kernel::V3D &getDetLoc(const double wav) const;
  double gravitationalDrop(const double L2, const double waveLength, const double extraLength) const;
  double calcSinTheta() const;
};
} // namespace Algorithms
} // namespace Mantid