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// $Id: MyExPrimaryGeneratorAction.cc,v 1.1 2006/11/28 15:19:42 tnikitin Exp $
// GEANT4 tag $Name: geant4-09-04-ref-00 $
//

#include "ExN01PrimaryGeneratorAction.hh"

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

ExN01PrimaryGeneratorAction::ExN01PrimaryGeneratorAction()
{
  G4int n_particle = 1;
  particleGun = new G4ParticleGun(n_particle);

  G4ParticleTable* particleTable = G4ParticleTable::GetParticleTable();
  G4String particleName;
  particleGun->SetParticleDefinition(particleTable->FindParticle(particleName="e-"));
  ////First Test =No Intersection
  G4double momen=(0.3*2.*0.70001)*GeV;
  G4double kinEnergy=std::sqrt(momen*momen+0.000510999*0.000510999*GeV);
  particleGun->SetParticleEnergy(kinEnergy);
  particleGun->SetParticlePosition(G4ThreeVector(-70.0001*cm, 0.0*cm,-0.0*cm));
  /////Second Test=Intersection But Almost Not !!!Very slow step but not in Propagator
  //G4double momen=(0.3*2.*0.50001)*GeV;
  // G4double kinEnergy=std::sqrt(momen*momen+0.000510999*0.000510999*GeV);
  //  particleGun->SetParticleEnergy(kinEnergy);
  //  particleGun->SetParticlePosition(G4ThreeVector(-70.0001*cm, 0.0*cm,-0.0*cm));
  /////Third Test=No Intersection But One "Difficult" Point
  //Test simple 
  //   G4double momen=(0.3*2.*0.20001)*GeV;
  //   G4double kinEnergy=std::sqrt(momen*momen+0.000510999*0.000510999*GeV);
  //  particleGun->SetParticleEnergy(kinEnergy);
  //  particleGun->SetParticlePosition(G4ThreeVector(-70.0001*cm, 0.0*cm,-0.0*cm));
  
    G4cout<<"Energy="<<kinEnergy/GeV<<"  Radius="<<momen/0.6/mm<<G4endl;
   
}

ExN01PrimaryGeneratorAction::~ExN01PrimaryGeneratorAction()
{
  delete particleGun;
}

void ExN01PrimaryGeneratorAction::GeneratePrimaries(G4Event* anEvent)
{
  G4int i = anEvent->GetEventID() % 3;
  G4ThreeVector v(0.0,1.0,0.01);
  // switch(i)
  //{
  //  case 0:
  //    break;
  //  case 1:
  //    v.setY(0.1);
  //    break;
  //  case 2:
  //    v.setZ(0.1);
  //    break;
  //}
  particleGun->SetParticleMomentumDirection(v);
  particleGun->GeneratePrimaryVertex(anEvent);
}


