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//
// G4HarmonicPolMagField
//
// Class description:
//
// Class describing magnetic field parametrised by harmonic polynom up to
// 3rd order. The function MagneticField(yTrack,B) calculates the magnetic
// field induction vector B for the trajectory point yTrack according to
// formula given in:
//   M.Metcalf, Analysis of the SFM Field
//   OM Development Note AP-10 (revised), 1974

// Author: Vladimir Grichine (CERN), 03.02.1997
// --------------------------------------------------------------------
#ifndef G4HARMONICPOLMAGFIELD_HH
#define G4HARMONICPOLMAGFIELD_HH

#include "G4MagneticField.hh"

/**
 * @brief G4HarmonicPolMagField describes a magnetic field parametrised
 * by harmonic polynom up to 3rd order.
 */

class G4HarmonicPolMagField : public G4MagneticField
{
  public:
                       
    /**
     * Default Constructor and Destructor.
     */
    G4HarmonicPolMagField() = default;
    ~G4HarmonicPolMagField() override = default;
     
    /**
     * Returns the field value on the given position 'yTrack'.
     *  @param[in] yTrack Time position array.
     *  @param[out] B The returned field array.
     */
    void GetFieldValue(const G4double yTrack[], G4double B[]) const override;

    /**
     * Returns a pointer to a new allocated clone of this object.
     */
    G4HarmonicPolMagField* Clone() const override;
};

#endif