KFVertex.h

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/*
 * This file is part of KFParticle package
 * Copyright (C) 2007-2019 FIAS Frankfurt Institute for Advanced Studies
 *               2007-2019 Goethe University of Frankfurt
 *               2007-2019 Ivan Kisel <I.Kisel@compeng.uni-frankfurt.de>
 *               2007-2019 Maksym Zyzak
 *
 * KFParticle is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * KFParticle is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program.  If not, see <https://www.gnu.org/licenses/>.
 */


#ifndef KFVERTEX_H
#define KFVERTEX_H

#include "KFParticle.h"
#include "KFPVertex.h"

class KFVertex : public KFParticle
{
 public:

  KFVertex():KFParticle(),fIsConstrained(0){ } 
  KFVertex( const KFParticle &particle ): KFParticle(particle), fIsConstrained(0) {} 
  KFVertex( const KFPVertex &vertex );
  ~KFVertex(){}

  Int_t GetNContributors() const { return fIsConstrained ?fNDF/2:(fNDF+3)/2; } 


  void operator +=( const KFParticle &Daughter );  
  KFVertex operator -( const KFParticle &Daughter ) const; 
  void operator -=( const KFParticle &Daughter );  

  void SetBeamConstraint( float X, float Y, float Z, 
                          float ErrX, float ErrY, float ErrZ );
  void SetBeamConstraintOff();

  void ConstructPrimaryVertex( const KFParticle *vDaughters[], int nDaughters,
                               Bool_t vtxFlag[], float ChiCut=3.5  );

 protected:

  Bool_t fIsConstrained; 
  
#ifndef KFParticleStandalone
  ClassDef( KFVertex, 2 )
#endif
};


//---------------------------------------------------------------------
//
//     Inline implementation of the KFVertex methods
//
//---------------------------------------------------------------------


inline void KFVertex::operator+=( const KFParticle &Daughter )
{
  KFParticle::operator+=( Daughter );
}
  

inline void KFVertex::operator-=( const KFParticle &Daughter )
{
  Daughter.SubtractFromVertex( *this );
}
  
inline KFVertex KFVertex::operator-( const KFParticle &Daughter ) const 
{
  KFVertex tmp = *this;
  Daughter.SubtractFromVertex( tmp );
  return tmp;
}


#endif