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

#include "ExErrorMagneticField.hh"

#include "G4FieldManager.hh"
#include "G4TransportationManager.hh"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
ExErrorMagneticField::ExErrorMagneticField() : G4UniformMagField(G4ThreeVector())
{
  GetGlobalFieldManager()->SetDetectorField(this);
  GetGlobalFieldManager()->CreateChordFinder(this);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
ExErrorMagneticField::ExErrorMagneticField(G4ThreeVector fieldVector)
  : G4UniformMagField(fieldVector)
{
  GetGlobalFieldManager()->SetDetectorField(this);
  GetGlobalFieldManager()->CreateChordFinder(this);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void ExErrorMagneticField::SetFieldValue(G4double fieldValue)
{
  G4UniformMagField::SetFieldValue(G4ThreeVector(0, 0, fieldValue));
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
void ExErrorMagneticField::SetFieldValue(G4ThreeVector fieldVector)
{
  // Find the Field Manager for the global field
  G4FieldManager* fieldMgr = GetGlobalFieldManager();

  if (fieldVector != G4ThreeVector(0., 0., 0.)) {
    G4UniformMagField::SetFieldValue(fieldVector);
    fieldMgr->SetDetectorField(this);
  }
  else {
    // If the new field's value is Zero, then it is best to
    //  insure that it is not used for propagation.
    G4MagneticField* magField = NULL;
    fieldMgr->SetDetectorField(magField);
  }
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
G4FieldManager* ExErrorMagneticField::GetGlobalFieldManager()
{
  return G4TransportationManager::GetTransportationManager()->GetFieldManager();
}
