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//
//
// $Id$
//
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#include "eRositaPrimaryGeneratorAction.hh"
#include "eRositaDetectorConstruction.hh"

#include "globals.hh"
#include "G4SystemOfUnits.hh"
#include "G4Event.hh"
#include "G4ParticleGun.hh"
#include "G4ParticleTable.hh"
#include "G4ParticleDefinition.hh"

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eRositaPrimaryGeneratorAction::eRositaPrimaryGeneratorAction(
	                                eRositaDetectorConstruction* myDC)
:myDetector(myDC)
{
  G4int n_particle = 1;
//   G4int n_particle = 1000;
  particleGun = new G4ParticleGun(n_particle);

// default particle

  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();

  G4ParticleDefinition* particle = particleTable->FindParticle("proton");
  
  particleGun->SetParticleDefinition(particle);
  xdirection =  0.0;     // x component of initial momentum vector
  ydirection = -0.5;     // y              -"-
  zdirection = -1.0;     // z              -"-
  particleGun->SetParticleMomentumDirection(G4ThreeVector(xdirection,ydirection,zdirection));
  particleGun->SetParticleEnergy(100.0*MeV);

}

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eRositaPrimaryGeneratorAction::~eRositaPrimaryGeneratorAction()
{
  delete particleGun;
}

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void eRositaPrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{ 

  xposition = 0.0*cm;
  yposition = 2.25*cm;
  zposition = 4.0*cm;

  particleGun->SetParticlePosition(G4ThreeVector(xposition,yposition,zposition));

  particleGun->GeneratePrimaryVertex(anEvent);
}

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