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/// \file persistency/P01/include/ExP01MagneticField.hh
/// \brief Definition of the ExP01MagneticField class
//
//
//
//
//    A class for control of the Magnetic Field of the detector.
//  The field is assumed to be uniform.
// 
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#ifndef ExP01MagneticField_H
#define ExP01MagneticField_H

#include "G4UniformMagField.hh"

class G4FieldManager;

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/// Magnetic field for the persistency example

class ExP01MagneticField: public G4UniformMagField
{
  public:
  
   ExP01MagneticField(G4ThreeVector);  //  The value of the field
   ExP01MagneticField();               //  A zero field
  ~ExP01MagneticField();  
      
   //Set the field (fieldValue,0,0)
   void SetFieldValue(G4double fieldValue);
   void SetFieldValue(G4ThreeVector fieldVector);
      
   G4ThreeVector GetConstantFieldValue();

  protected:

      // Find the global Field Manager
      G4FieldManager* GetGlobalFieldManager();   // static 
};

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#endif
