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HepMCProduct.cc

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/*************************
 *
 *  Date: 2005/08 $
 *  \author J Weng - F. Moortgat'
 */

#include "SimDataFormats/HepMCProduct/interface/HepMCProduct.h"
#include <iostream>
#include <algorithm> // because we use std::swap

//#include "CLHEP/Vector/ThreeVector.h"

using namespace edm;
using namespace std;

HepMCProduct::HepMCProduct( HepMC::GenEvent * evt ) {
    evt_ = evt;
    cout << "Contructing HepMCProduct" << endl;
    
    //note: this is not quite safe, because GenEvent does NOT
    //      know if vertex smearing applied or nor - only the
    //      HepMCProduct itself knows !
    // isVtxGenApplied_ = 0 ;  // ???
}

HepMCProduct::~HepMCProduct(){

        delete evt_; evt_ = 0; isVtxGenApplied_ = false;
        isVtxBoostApplied_ = false;
        isPBoostApplied_ = false;
}


void HepMCProduct::addHepMCData( HepMC::GenEvent  *evt){
  //  evt->print();
  // cout <<sizeof (evt)  <<"  " << sizeof ( HepMC::GenEvent)   << endl;
  evt_ = evt;
  
  // same story about vertex smearing - GenEvent won't know it...
  // in fact, would be better to implement CmsGenEvent...
  
}

void HepMCProduct::applyVtxGen( HepMC::FourVector* vtxShift ) const
{
        //std::cout<< " applyVtxGen called " << isVtxGenApplied_ << endl;

   if ( isVtxGenApplied() ) return ;
      
   for ( HepMC::GenEvent::vertex_iterator vt=evt_->vertices_begin();
                                          vt!=evt_->vertices_end(); ++vt )
   {
            
      double x = (*vt)->position().x() + vtxShift->x() ;
      double y = (*vt)->position().y() + vtxShift->y() ;
      double z = (*vt)->position().z() + vtxShift->z() ;
      // for now, (re)set time exactly as it comes from the generator
      double t = (*vt)->position().t() ;
      //std::cout << " vertex (x,y,z)= " << x <<" " << y << " " << z << std::endl;
      (*vt)->set_position( HepMC::FourVector(x,y,z,t) ) ;      
   }
      
   isVtxGenApplied_ = true ;
   
   return ;

} 

void HepMCProduct::boostToLab( TMatrixD* lorentz, std::string type ) const {

        //std::cout << "from boostToLab:" << std::endl;
        
  
  
        if ( lorentz == 0 ) {

                //std::cout << " lorentz = 0 " << std::endl;
                return;
        }

        //lorentz->Print();

  TMatrixD tmplorentz(*lorentz);
  //tmplorentz.Print();
  
        if ( type == "vertex") {

                if ( isVtxBoostApplied() ) {
                        //std::cout << " isVtxBoostApplied true " << std::endl;
                        return ;
                }
                
                for ( HepMC::GenEvent::vertex_iterator vt=evt_->vertices_begin();
                          vt!=evt_->vertices_end(); ++vt ) {

                        // change basis to lorentz boost definition: (t,x,z,y)
                        TMatrixD p4(4,1);
                        p4(0,0) = (*vt)->position().t();
                        p4(1,0) = (*vt)->position().x();
                        p4(2,0) = (*vt)->position().z();
                        p4(3,0) = (*vt)->position().y();

                        TMatrixD p4lab(4,1);
                        p4lab = tmplorentz * p4;
                        //std::cout << " vertex lorentz: " << p4lab(1,0) << " " << p4lab(3,0) << " " << p4lab(2,0) << std::endl;
                        (*vt)->set_position( HepMC::FourVector(p4lab(1,0),p4lab(3,0),p4lab(2,0), p4lab(0,0) ) ) ;      
                }
      
                isVtxBoostApplied_ = true ;
        }
        else if ( type == "momentum") {
                
                if ( isPBoostApplied() ) {
                        //std::cout << " isPBoostApplied true " << std::endl;
                        return ;
                }
                
                for ( HepMC::GenEvent::particle_iterator part=evt_->particles_begin();
                          part!=evt_->particles_end(); ++part ) {

                        // change basis to lorentz boost definition: (E,Px,Pz,Py)
                        TMatrixD p4(4,1);
                        p4(0,0) = (*part)->momentum().e();
                        p4(1,0) = (*part)->momentum().x();
                        p4(2,0) = (*part)->momentum().z();
                        p4(3,0) = (*part)->momentum().y();

                        TMatrixD p4lab(4,1);
                        p4lab = tmplorentz * p4;
                        //std::cout << " momentum lorentz: " << p4lab(1,0) << " " << p4lab(3,0) << " " << p4lab(2,0) << std::endl;
                        (*part)->set_momentum( HepMC::FourVector(p4lab(1,0),p4lab(3,0),p4lab(2,0),p4lab(0,0) ) ) ;      
                }
      
                isPBoostApplied_ = true ;
        }
        else {
                std::cout << " no type found for boostToLab(std::string), options are vertex or momentum" << std::endl;
        }
                
                 
        return ;
}


const HepMC::GenEvent&  
HepMCProduct::getHepMCData()const   {

  return  * evt_;
}

// copy constructor
HepMCProduct::HepMCProduct(HepMCProduct const& other) :
  evt_(0) {
  
   if (other.evt_) evt_=new HepMC::GenEvent(*other.evt_);
   isVtxGenApplied_ = other.isVtxGenApplied_ ;
   isVtxBoostApplied_ = other.isVtxBoostApplied_;
   isPBoostApplied_ = other.isPBoostApplied_;
}

// swap
void
HepMCProduct::swap(HepMCProduct& other) {
  std::swap(evt_, other.evt_);
  std::swap(isVtxGenApplied_, other.isVtxGenApplied_);
  std::swap(isVtxBoostApplied_, other.isVtxBoostApplied_);
  std::swap(isPBoostApplied_, other.isPBoostApplied_);
  
}

// assignment: use copy/swap idiom for exception safety.
HepMCProduct&
HepMCProduct::operator=(HepMCProduct const& other) {
  HepMCProduct temp(other);
  swap(temp);
  return *this;
} 

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