Bk2BkExpConvPV.h

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// Mantid Repository : https://github.com/mantidproject/mantid
//
// Copyright © 2012 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 "MantidAPI/IFunctionMW.h"
#include "MantidAPI/IPeakFunction.h"
#include "MantidCurveFitting/DllConfig.h"
#include "MantidKernel/System.h"
#include <complex>
 
namespace Mantid {
namespace CurveFitting {
namespace Functions {
 
class MANTID_CURVEFITTING_DLL Bk2BkExpConvPV : virtual public API::IPeakFunction, virtual public API::IFunctionMW {
public:
  Bk2BkExpConvPV() = default;
 
  double centre() const override;
  double height() const override;
  double fwhm() const override;
  void setCentre(const double c) override;
  void setHeight(const double h) override;
  void setFwhm(const double w) override;
 
  std::string name() const override { return "Bk2BkExpConvPV"; }
  const std::string category() const override { return "Peak"; }
 
  // void setCalculationRange(double tof_low, double tof_upper);
  void geneatePeak(double *out, const double *xValues, const size_t nData);
 
  void setMatrixWorkspace(std::shared_ptr<const API::MatrixWorkspace> workspace, size_t wi, double startX,
                          double endX) override;
 
protected:
  void functionLocal(double *out, const double *xValues, const size_t nData) const override;
  void functionDerivLocal(API::Jacobian *out, const double *xValues, const size_t nData) override;
  void functionDeriv(const API::FunctionDomain &domain, API::Jacobian &jacobian) override;
 
  void init() override;
 
private:
  mutable std::vector<double> m_dtt1;
 
  double calOmega(double x, double eta, double N, double alpha, double beta, double H, double sigma2,
                  double invert_sqrt2sigma) const;
 
  std::complex<double> E1(std::complex<double> z) const;
 
  void calHandEta(double sigma2, double gamma, double &H, double &eta) const;
  double expWidth() const;
};
 
// using TableWorkspace_sptr = std::shared_ptr<TableWorkspace>;
 
using Bk2BkExpConvPV_sptr = std::shared_ptr<Bk2BkExpConvPV>;
 
} // namespace Functions
} // namespace CurveFitting
} // namespace Mantid