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/// \file field/BlineTracer/include/G4BlinePrimaryGeneratorAction.hh
/// \brief Definition of the G4BlinePrimaryGeneratorAction class
//
//
//
//
// --------------------------------------------------------------------
//
// Class description:
//
// Defines the primary generator action used for tracing magnetic
// field lines.
// It generates the primary vertex by using the user defined primary
// generator action and replaces only the definition of the particle
// to be tracked by a "charged-geantino".
// The user can define start position for field line tracking in
// his/her own primary generator action.

// --------------------------------------------------------------------
// Author: Laurent Desorgher (desorgher@phim.unibe.ch)
//         Created - 2003-10-06
// --------------------------------------------------------------------
#ifndef G4BlinePrimaryGeneratorAction_h
#define G4BlinePrimaryGeneratorAction_h 1

#include <vector>

#include "G4Types.hh"
#include "G4ThreeVector.hh"
#include "G4VUserPrimaryGeneratorAction.hh"

class G4Event;

class G4BlinePrimaryGeneratorAction : public G4VUserPrimaryGeneratorAction
{
  public:  // with description

    G4BlinePrimaryGeneratorAction() = default;
    ~G4BlinePrimaryGeneratorAction() override = default;

     void GeneratePrimaries(G4Event* anEvent) override;
    inline void SetUserPrimaryAction(G4VUserPrimaryGeneratorAction* anAction)
      { fUserPrimaryAction=anAction; }

  private:

    G4VUserPrimaryGeneratorAction* fUserPrimaryAction = nullptr;
    G4bool fFirstPartOfBline = true;
    G4ThreeVector fBlineStartPosition;
    G4double fT0 = 0.;
};

#endif
