G4ElectroMagneticField.hh

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//
// G4ElectroMagneticField
//
// Class description:
//
// A full electromagnetic field, containing both electric and magnetic fields.
// It is an abstract class, and a derived type of this field must be
// created by the user to describe his/her field configuration.
//
// We have established a convention for the electromagnetic field components:
// In the GetValue() method, the return values of Bfield will have 
// the following meaning
//  - Components 0, 1 and 2 are the Magnetic Field (x, y, z respectively);
//  - Components 3, 4 and 5 are the Electric field (x, y, z respectively).
// 
// Note 1: one or the other field could optional, depending on the Equation
// Note 2: such a convention is required between any field and its 
//         corresponding equation of motion.

// Created: J.Apostolakis, 12.11.1998
// Modified: V.Grichine, 08.11.2001: Extended "Point" to add time
// -------------------------------------------------------------------
#ifndef G4ELECTROMAGNETIC_FIELD_HH
#define G4ELECTROMAGNETIC_FIELD_HH

#include "G4Field.hh"

class G4ElectroMagneticField : public G4Field
{
  public:  // with description

     G4ElectroMagneticField();
     virtual ~G4ElectroMagneticField();

     G4ElectroMagneticField(const G4ElectroMagneticField& r);
     G4ElectroMagneticField& operator = (const G4ElectroMagneticField& p);
       // Copy constructor & assignment operators.

     virtual void  GetFieldValue(const G4double Point[4],
                                       G4double *Bfield ) const = 0;
       // Return as Bfield[0], [1], [2] the magnetic field x, y & z components
       // and   as Bfield[3], [4], [5] the electric field x, y & z components

     virtual G4bool DoesFieldChangeEnergy() const = 0;
       // For field with an electric component this should be true
       // For pure magnetic field this should be false
       // Alternative: default safe implementation { return true; }
};

#endif