exGPSEventAction.cc

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// $Id: exGPSEventAction.cc 76468 2013-11-11 10:27:19Z gcosmo $
//
//

#include "exGPSEventAction.hh"
#include "exGPSEventActionMessenger.hh"

#include "exGPSHistoManager.hh"


#include "G4Event.hh"
#include "G4EventManager.hh"
#include "G4ios.hh"
#include "G4UnitsTable.hh"
#include "G4ThreeVector.hh"
#include "G4PhysicalConstants.hh"

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exGPSEventAction::exGPSEventAction(exGPSHistoManager* histoManager)
:G4UserEventAction(),
 fDrawFlag("all"), fPrintModulo(1000), fEventMessenger(NULL),
 fexGPSHistoManager(histoManager)
{
 fEventMessenger = new exGPSEventActionMessenger(this);
}

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exGPSEventAction::~exGPSEventAction()
{
  delete fEventMessenger;
}

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void exGPSEventAction::BeginOfEventAction(const G4Event* evt)
{
  
  G4int evtNb = evt->GetEventID();
  if (evtNb%fPrintModulo == 0)
    { 
      G4cout << "\n---> Begin of event: " << evtNb << G4endl;
      //  HepRandom::showEngineStatus();
    }
    
}

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void exGPSEventAction::EndOfEventAction(const G4Event* evt)
{
  //  G4int evtNb = evt->GetEventID();

  G4int nVertex = evt->GetNumberOfPrimaryVertex();
  for ( G4int j = 0; j < nVertex; j++) { 
    G4int nPart =  evt->GetPrimaryVertex(j)->GetNumberOfParticle(); 
    for ( G4int i = 0; i < nPart; i++) {
      G4ThreeVector position=evt->GetPrimaryVertex(j)->GetPosition();
      G4ThreeVector direction=evt->GetPrimaryVertex(j)->GetPrimary(i)
                                 ->GetMomentum();
      G4double P=direction.mag();
      G4double E=evt->GetPrimaryVertex(j)->GetPrimary(i)->GetMass();
      G4double E0=evt->GetPrimaryVertex(j)->GetPrimary(i)->GetG4code()
                                 ->GetPDGMass();
      E=std::sqrt(P*P+E0*E0);   
      E -= E0;
      G4int pid = evt->GetPrimaryVertex(j)->GetPrimary(i)
                                 ->GetPDGcode();
      //
      direction=direction*(1./direction.mag());                
      direction = -direction;  // reverse the direction
      G4double x,y,z,w;
      G4double Phi=direction.phi();
      if (Phi <0) Phi=Phi+twopi;
      G4double Theta=direction.theta();
      x=position.x();
      y=position.y();
      z=position.z();
      w = evt->GetPrimaryVertex(j)->GetPrimary(i)->GetWeight();
      fexGPSHistoManager->Fill(pid,E,x,y,z,Theta,Phi,w);
    }
  }   
}

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