PointGeomAnalyzer.h

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//____________________________________________________________________________
/*!
 
\class   genie::geometry::PointGeomAnalyzer
 
\brief   The PointGeomAnalyzer class is the simplest implementation of the
         GeomAnalyserI interface and defines a simple 'point-like' geometry.
 
         Use this geometry analyzer to generate events when you do not want
         to use a detailed GEANT/ROOT geometry description but you only need
         to generate events for a 'single' nuclear target while you still want
         to use the GENIE MC job driver 'loaded' with a GENIE flux driver.
         The geometry can also support a mix of targets, each with its
         corresponding weight.
 
\author  Costas Andreopoulos <c.andreopoulos \at cern.ch>
         University of Liverpool
 
\created July 14, 2005
 
\cpright Copyright (c) 2003-2025, The GENIE Collaboration
         For the full text of the license visit http://copyright.genie-mc.org        
*/
//____________________________________________________________________________
 
#ifndef _POINT_GEOMETRY_ANALYZER_H_
#define _POINT_GEOMETRY_ANALYZER_H_
 
#include <map>
 
#include "Framework/EventGen/GeomAnalyzerI.h"
 
using std::map;
 
namespace genie    {
namespace geometry {
 
class PointGeomAnalyzer : public GeomAnalyzerI {
 
public :
  PointGeomAnalyzer(int tgtpdgc);
  PointGeomAnalyzer(unsigned int n, const int tgt_pdg[], const double weight[]);
  PointGeomAnalyzer(const map<int,double> & tgtmap /* pdg -> weight*/);
 ~PointGeomAnalyzer();
 
  // implement the GeomAnalyzerI interface
 
  const PDGCodeList &    ListOfTargetNuclei    (void);
  const PathLengthList & ComputeMaxPathLengths (void);
 
  const PathLengthList &
           ComputePathLengths
             (const TLorentzVector & x, const TLorentzVector & p);
  const TVector3 &
           GenerateVertex
             (const TLorentzVector & x, const TLorentzVector & p, int tgtpdg);
private:
 
  void Initialize (const map<int,double> & tgtmap);
  void CleanUp    (void);
 
  TVector3 *       fCurrVertex;          ///< current generated vertex
  PathLengthList * fCurrPathLengthList;  ///< current list of path-lengths
  PDGCodeList *    fCurrPDGCodeList;     ///< current list of target nuclei
};
 
}      // geometry namespace
}      // genie    namespace
 
#endif // _POINT_GEOMETRY_ANALYZER_H_