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// ********************************************************************
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//
// $Id: G4BlineTracer.hh,v 1.2 2006/06/29 17:15:03 gunter Exp $
// GEANT4 tag $Name: geant4-09-04-beta-01 $
//
// 
// --------------------------------------------------------------------
//
// G4BlineTracer
//
// Class description:
//
// Defines a tool to trace and visualise magnetic field lines
// To use this tool in a Geant4 application the user should  
// create an instance of this class in the code as a run action.
// It will only work if a G4MagneticField field object is declared.

// --------------------------------------------------------------------
// Author: Laurent Desorgher (desorgher@phim.unibe.ch)
//         Created - 2003-10-06
// --------------------------------------------------------------------
#ifndef G4BlineTracer_h
#define G4BlineTracer_h 1

#include <vector>

#include "G4Types.hh"
#include "G4UserRunAction.hh"

class G4VUserPrimaryGeneratorAction;
class G4MagneticField;
class G4FieldManager;
class G4ChordFinder;

class G4BlineTracerMessenger;
class G4BlineSteppingAction;
class G4BlineEventAction;
class G4BlinePrimaryGeneratorAction;
class G4BlineEquation;

class G4BlineTracer : public G4UserRunAction 
{
   public:  // with description
  
     G4BlineTracer();
     virtual ~G4BlineTracer();
  
     virtual void BeginOfRunAction(const G4Run* aRun);
     virtual void EndOfRunAction(const G4Run* aRun);

     void ComputeBlines(G4int nlines);

     inline void SetMaxTrackingStep(G4double max_step)
       { MaxTrackingStep=max_step; }
     inline G4BlineEventAction* GetEventAction()
       { return fEventAction; }

   private:

     void ResetChordFinders();

   private:

     G4BlineTracerMessenger* fMessenger;
     G4BlineSteppingAction* fSteppingAction;
     G4BlineEventAction* fEventAction;
     G4BlinePrimaryGeneratorAction* fPrimaryGeneratorAction;
     G4double MaxTrackingStep;
     G4bool was_ResetChordFinders_already_called;
 
     G4VUserPrimaryGeneratorAction* fUserPrimaryAction;
       // User defined primary generator action

     std::vector<G4ChordFinder* > vecChordFinders;
     std::vector<G4FieldManager* > vecFieldManagers;
     std::vector<G4MagneticField* > vecMagneticFields;
     std::vector<G4BlineEquation* > vecEquationOfMotion;
       // ChordFinders, detector fields, equation of motions, and field
       // manager for the different local and global magnetic fields.
};

#endif