//
// ********************************************************************
// * DISCLAIMER                                                       *
// *                                                                  *
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//
//
// $Id: ExN02MagneticField.cc,v 1.7 2002/01/09 17:24:10 ranjard Exp $
// GEANT4 tag $Name: geant4-04-01 $
//  
//   User Field class implementation.
//
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#include "ExN02MagneticField.hh"
#include "G4FieldManager.hh"

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ExN02MagneticField::ExN02MagneticField()
  : G4UniformMagField(G4ThreeVector())
{
  GetGlobalFieldManager()->SetDetectorField(this);
  GetGlobalFieldManager()->CreateChordFinder(this);
}

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ExN02MagneticField::ExN02MagneticField(G4ThreeVector fieldVector)
  : G4UniformMagField(fieldVector)
{
  GetGlobalFieldManager()->SetDetectorField(this);    
  GetGlobalFieldManager()->CreateChordFinder(this);
}

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// Set the value of the Global Field to fieldValue along X
//
void ExN02MagneticField::SetFieldValue(G4double fieldValue)
{
   G4UniformMagField::SetFieldValue(G4ThreeVector(fieldValue,0,0));
}

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// Set the value of the Global Field
//
void ExN02MagneticField::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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ExN02MagneticField::~ExN02MagneticField()
{
  // GetGlobalFieldManager()->SetDetectorField(0);
}

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#include "G4TransportationManager.hh"

G4FieldManager*  ExN02MagneticField::GetGlobalFieldManager()
{
  return G4TransportationManager::GetTransportationManager()->GetFieldManager();
}

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