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// $Id: G4UniformMagField.hh,v 1.9 2006/06/29 18:23:27 gunter Exp $
// GEANT4 tag $Name: geant4-09-02-cand-01 $
//
// 
// class G4UniformMagField
//
// Class description:
//
// Class for creation of Uniform Magnetic Field.

// History:
// - 30.01.97 V.Grichine, Created.
// - 01.08.97 J.Apostolakis, cleanup, new 3-vector constructor, 
//            and removal of helix-stepper (to separate file).
// - 05.11.97 G.Cosmo, added copy constructor and assignment operator.

#ifndef G4UNIFORMMAGFIELD_HH
#define G4UNIFORMMAGFIELD_HH

#include "G4Types.hh"
#include "G4ThreeVector.hh"
#include "G4MagneticField.hh"

class G4UniformMagField : public G4MagneticField
{
  public:  // with description
  
    G4UniformMagField(const G4ThreeVector& FieldVector );
      // A field with value equal to FieldVector.

    G4UniformMagField(G4double vField,
                      G4double vTheta,
                      G4double vPhi     ) ;

    virtual ~G4UniformMagField() ;

    G4UniformMagField(const G4UniformMagField &p);
    G4UniformMagField& operator = (const G4UniformMagField &p);
      // Copy constructor and assignment operator.

    virtual void GetFieldValue(const G4double yTrack[4],
                                     G4double *MagField) const ;

    void SetFieldValue(const G4ThreeVector& newFieldValue);

    G4ThreeVector GetConstantFieldValue() const;
      // Return the field value  

  private:

    G4double fFieldComponents[3] ;
};

#endif
