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

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


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


//-------------------------------------------------------------
void ExErrorMagneticField::SetFieldValue(G4double fieldValue)
{
  G4UniformMagField::SetFieldValue(G4ThreeVector(0,0,fieldValue));

}


//-------------------------------------------------------------
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);
  }
}


//-------------------------------------------------------------
ExErrorMagneticField::~ExErrorMagneticField()
{
}


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