G4INCLRandom.cc

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//
// INCL++ intra-nuclear cascade model
// Pekka Kaitaniemi, CEA and Helsinki Institute of Physics
// Davide Mancusi, CEA
// Alain Boudard, CEA
// Sylvie Leray, CEA
// Joseph Cugnon, University of Liege
//
#define INCLXX_IN_GEANT4_MODE 1

#include "globals.hh"

/*
 * G4INCLRandom.cc
 *
 *  \date 7 June 2009
 * \author Pekka Kaitaniemi
 */

#include "G4INCLRandom.hh"
#include "G4INCLGlobals.hh"

namespace G4INCL {

  G4INCL::IRandomGenerator* Random::theGenerator;

  G4double Random::gauss(G4double sigma) {
    // generate a Gaussian random number with standard deviation sigma
    // uses the flat() and flat0() methods
    static G4bool generated = false;
    static G4double u, v;

    if( !generated )
    {
      u = shoot0();
      v = Math::twoPi*shoot();
      generated = true;
      return sigma*std::sqrt(-2*std::log(u))*std::cos(v);
    }
    else
    {
      generated = false;
      return sigma*std::sqrt(-2*std::log(u))*std::sin(v);
    }
  }

  ThreeVector Random::normVector(G4double norm) {

    const G4double ctheta = (1.-2.*shoot());
    const G4double stheta = std::sqrt(1.-ctheta*ctheta);
    const G4double phi = Math::twoPi*shoot();
    return ThreeVector(
        norm * stheta * std::cos(phi),
        norm * stheta * std::sin(phi),
        norm * ctheta);

  }

}