BDSIntegratorEulerOld.hh

/* 
Beam Delivery Simulation (BDSIM) Copyright (C) Royal Holloway, 
University of London 2001 - 2023.
 
This file is part of BDSIM.
 
BDSIM is free software: you can redistribute it and/or modify 
it under the terms of the GNU General Public License as published 
by the Free Software Foundation version 3 of the License.
 
BDSIM is distributed in the hope that it will be useful, but 
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU General Public License for more details.
 
You should have received a copy of the GNU General Public License
along with BDSIM.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef BDSINTEGRATOREULEROLD_H
#define BDSINTEGRATOREULEROLD_H
 
#include "BDSIntegratorMag.hh"
 
#include "globals.hh"
 
class G4Mag_EqRhs;
 
class BDSIntegratorEulerOld: public BDSIntegratorMag
{
public:
  explicit BDSIntegratorEulerOld(G4Mag_EqRhs* eqOfMIn);
  virtual ~BDSIntegratorEulerOld(){;}
 
  virtual void Stepper(const G4double yIn[],
                       const G4double dydx[],
                       const G4double h,
                       G4double       yOut[],
                       G4double       yErr[]);
  
protected:
  virtual void AdvanceHelix(const G4double yIn[],
                            G4double       h,
                            G4double       yOut[],
                            G4double       yErr[]) = 0;
 
  void AdvanceChord(const G4double       h,
                    G4ThreeVector&       localPos,
                    G4ThreeVector&       localMom,
                    const G4ThreeVector& localA);
};
 
#endif