OpBoundaryProcessSimple.hh

Go to the documentation of this file.

// ********************************************************************
// * License and Disclaimer                                           *
// *                                                                  *
// * The  Geant4 software  is  copyright of the Copyright Holders  of *
// * the Geant4 Collaboration.  It is provided  under  the terms  and *
// * conditions of the Geant4 Software License,  included in the file *
// * LICENSE and available at  http://cern.ch/geant4/license .  These *
// * include a list of copyright holders.                             *
// *                                                                  *
// * Neither the authors of this software system, nor their employing *
// * institutes,nor the agencies providing financial support for this *
// * work  make  any representation or  warranty, express or implied, *
// * regarding  this  software system or assume any liability for its *
// * use.  Please see the license in the file  LICENSE  and URL above *
// * for the full disclaimer and the limitation of liability.         *
// *                                                                  *
// * This  code  implementation is the result of  the  scientific and *
// * technical work of the GEANT4 collaboration.                      *
// * By using,  copying,  modifying or  distributing the software (or *
// * any work based  on the software)  you  agree  to acknowledge its *
// * use  in  resulting  scientific  publications,  and indicate your *
// * acceptance of all terms of the Geant4 Software license.          *
// ********************************************************************
//
//
// GEANT4 tag $Name:  $
//
//
// Optical Photon Boundary Process Class Definition

#ifndef OpBoundaryProcessSimple_h
#define OpBoundaryProcessSimple_h 1

#include "Geant4/G4ForceCondition.hh"
#include "Geant4/G4OpticalPhoton.hh"
#include "Geant4/G4ProcessType.hh"
#include "Geant4/G4String.hh"
#include "Geant4/G4Types.hh"
#include "Geant4/G4VDiscreteProcess.hh"
#include "Geant4/Randomize.hh"

class G4ParticleDefinition;
class G4Step;
class G4Track;
class G4VParticleChange;

// Class Definition

namespace larg4 {

  // Possible statuses of a particle after each step.
  enum OpBoundaryProcessSimpleStatus {
    Undefined,
    NotAtBoundary,
    SimpleAbsorbedNoRefl,
    SimpleAbsorbed,
    SimpleDiffuse,
    SimpleSpecular,
    StepTooSmall,
    NoRINDEX
  };

  class OpBoundaryProcessSimple : public G4VDiscreteProcess {
  public:
    OpBoundaryProcessSimple(const G4String& processName = "OpBoundary",
                            G4ProcessType type = fOptical);

    // Returns true -> 'is applicable' only for an optical photon.
    G4bool IsApplicable(const G4ParticleDefinition& aParticleType);

    // Returns infinity; i. e. the process does not limit the step,
    // but sets the 'Forced' condition for the DoIt to be invoked at
    // every step. However, only at a boundary will any action be
    // taken.
    G4double GetMeanFreePath(const G4Track&, G4double, G4ForceCondition* condition);

    // This is the method implementing boundary processes.
    G4VParticleChange* PostStepDoIt(const G4Track& aTrack, const G4Step& aStep);

    // Returns the current status.
    OpBoundaryProcessSimpleStatus GetStatus() const;

  private:
    // Generate a random bool to decide which process to execute
    G4bool G4BooleanRand(const G4double prob) const;

    OpBoundaryProcessSimpleStatus fTheStatus;
    G4double fCarTolerance;

    int fVerbosity;
  };

  inline G4bool OpBoundaryProcessSimple::G4BooleanRand(const G4double prob) const
  {
    /* Returns a random boolean variable with the specified probability */
    return (G4UniformRand() < prob);
  }

  inline G4bool OpBoundaryProcessSimple::IsApplicable(const G4ParticleDefinition& aParticleType)
  {
    return (&aParticleType == G4OpticalPhoton::OpticalPhoton());
  }

  inline OpBoundaryProcessSimpleStatus OpBoundaryProcessSimple::GetStatus() const
  {
    return fTheStatus;
  }

}

#endif /* OpBoundaryProcessSimple_h */