BDSFieldMagGlobal.cc

/* 
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/>.
*/
#include "BDSDebug.hh"
#include "BDSFieldMag.hh"
#include "BDSFieldMagGlobal.hh"
 
#include "globals.hh" // geant4 types / globals
#include "G4ThreeVector.hh"
 
BDSFieldMagGlobal::BDSFieldMagGlobal(BDSFieldMag* fieldIn):
  field(fieldIn)
{
  finiteStrength = field->FiniteStrength();
}
 
BDSFieldMagGlobal::~BDSFieldMagGlobal()
{
  delete field;
}
 
G4ThreeVector BDSFieldMagGlobal::GetFieldTransformed(const G4ThreeVector& position,
                                                     const G4double       t) const
{
  if (!finiteStrength)
    {return G4ThreeVector();} // quicker than query
  else
    {return GetField(position, t);}
}
 
G4ThreeVector BDSFieldMagGlobal::GetField(const G4ThreeVector& position,
                                          const G4double       t) const
{
  G4ThreeVector localPosition = ConvertToLocal(position);
  G4ThreeVector localField    = field->GetFieldTransformed(localPosition,t);
  G4ThreeVector globalField   = ConvertAxisToGlobal(localField);
  return globalField;
}