//  Geant4 simulation for MuSR
//  AUTHOR: Toni SHIROKA, Paul Scherrer Institut, PSI
//  DATE  : 2008-05
//

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#include "lem4MagneticField.hh"
#include "G4FieldManager.hh"

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lem4MagneticField::lem4MagneticField()
  : G4UniformMagField(G4ThreeVector())
{
  GetGlobalFieldManager()->SetDetectorField(this);
  GetGlobalFieldManager()->CreateChordFinder(this);
}

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lem4MagneticField::lem4MagneticField(G4ThreeVector fieldVector)
  : G4UniformMagField(fieldVector)
{
  GetGlobalFieldManager()->SetDetectorField(this);    
  GetGlobalFieldManager()->CreateChordFinder(this);
}

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// Set the value of the Global Field to fieldValue along Z
//
void lem4MagneticField::SetFieldValue(G4double fieldValue)
{
   G4UniformMagField::SetFieldValue(G4ThreeVector(0,0,fieldValue));
}

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// Set the value of the Global Field
//
void lem4MagneticField::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);
  }
}

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lem4MagneticField::~lem4MagneticField()
{
  // GetGlobalFieldManager()->SetDetectorField(0);
}

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#include "G4TransportationManager.hh"

G4FieldManager*  lem4MagneticField::GetGlobalFieldManager()
{
  return G4TransportationManager::GetTransportationManager()->GetFieldManager();
}

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