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/// \file G4BlineEquation.cc
/// \brief Implementation of the G4BlineEquation class

// --------------------------------------------------------------------
//
// G4BlineEquation implementation
//
// --------------------------------------------------------------------
// Author: Laurent Desorgher (desorgher@phim.unibe.ch)
//         Created - 2003-10-06
// --------------------------------------------------------------------

#include "G4BlineEquation.hh"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

G4BlineEquation::G4BlineEquation(G4MagneticField* magField) : G4Mag_EqRhs(magField) {}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void G4BlineEquation::EvaluateRhsGivenB(const G4double y[], const G4double B[3],
                                        G4double dydx[]) const
{
  G4double Bmag = fDirection * std::sqrt(B[0] * B[0] + B[1] * B[1] + B[2] * B[2]);
  dydx[0] = B[0] / Bmag;
  dydx[1] = B[1] / Bmag;
  dydx[2] = B[2] / Bmag;

  dydx[3] = 0. * y[0];  // y[0] is used to remove warning
  dydx[4] = 0.;
  dydx[5] = 0.;
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void G4BlineEquation::SetBackwardDirectionOfIntegration(G4bool abool)
{
  fBackward_direction = abool;
  fDirection = 1.;
  if (fBackward_direction) fDirection = -1.;
}
