G4UniformGravityField.hh

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// G4UniformGravifyField
//
// Class description:
//
// Class for creation of Uniform Gravitation Field.

// Created: P.Gumplinger, 14.06.2011 - Adapted from G4UniformElectricField
//          Thanks to P.Fierlinger (PSI), A.Capra and A.Fontana (INFN Pavia)
// -------------------------------------------------------------------
#ifndef G4UNIFORMGRAVITYFIELD_HH
#define G4UNIFORMGRAVITYFIELD_HH

#include <CLHEP/Units/PhysicalConstants.h>

#include "G4Types.hh"
#include "G4ThreeVector.hh"
#include "G4Field.hh"

class G4UniformGravityField : public G4Field
{
  public:  // with description

    G4UniformGravityField(const G4ThreeVector& FieldVector );
      // A field with value equal to FieldVector.

    G4UniformGravityField(const G4double gy = -9.81*CLHEP::m/CLHEP::s/CLHEP::s);
      // Standard Gravitational field on earth's surface

    virtual ~G4UniformGravityField();

    G4UniformGravityField(const G4UniformGravityField& p);
    G4UniformGravityField& operator=(const G4UniformGravityField& p);
      // Copy constructor and assignment operator

    inline G4bool DoesFieldChangeEnergy() const { return true; }
      // Since a gravitational field can change track energy

    virtual void GetFieldValue(const G4double Point[4], G4double* field) const;
    
    virtual G4Field* Clone() const;

  private:

    G4double fFieldComponents[3];
};

#endif