// This code implementation is the intellectual property of
// the GEANT4 collaboration.
//
// By copying, distributing or modifying the Program (or any work
// based on the Program) you indicate your acceptance of this statement,
// and all its terms.
//
// $Id: G4UniformMagField.hh,v 1.3 2000/04/27 09:14:07 gcosmo Exp $
// GEANT4 tag $Name: geant4-02-00 $
//
// 
// 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 "globals.hh"
#include "G4ThreeVector.hh"
#include "G4MagneticField.hh"
#include "G4Mag_EqRhs.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     ) ;
		       
    ~G4UniformMagField() ;

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

    void GetFieldValue(const G4double yTrack[3] ,
	                     G4double *MagField ) const ;

    void SetFieldValue( const G4ThreeVector& newFieldValue );

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

  private:
         G4double fFieldComponents[3] ;
};

#endif
