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// $Id: G4ComptonScattering.cc,v 1.31 2009/02/20 12:06:37 vnivanch Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
// 
//------------ G4ComptonScattering physics process -----------------------------
//                   by Michel Maire, April 1996
//
// 28-05-96, DoIt() small change in ElecDirection, by M.Maire
// 10-06-96, simplification in ComputeMicroscopicCrossSection(), by M.Maire
// 21-06-96, SetCuts implementation, M.Maire
// 13-09-96, small changes in DoIt for better efficiency. Thanks to P.Urban
// 06-01-97, crossection table + meanfreepath table, M.Maire
// 05-03-97, new Physics scheme, M.Maire
// 28-03-97, protection in BuildPhysicsTable, M.Maire
// 07-04-98, remove 'tracking cut' of the scattered gamma, MMa
// 04-06-98, in DoIt, secondary production condition:
//                                     range>std::min(threshold,safety)
// 13-08-98, new methods SetBining()  PrintInfo()
// 15-12-98, cross section=0 below 10 keV
// 28-05-01, V.Ivanchenko minor changes to provide ANSI -wall compilation
// 13-07-01, DoIt: suppression of production cut for the electron (mma)
// 03-08-01, new methods Store/Retrieve PhysicsTable (mma)
// 06-08-01, BuildThePhysicsTable() called from constructor (mma)
// 17-09-01, migration of Materials to pure STL (mma)
// 20-09-01, DoIt: fminimalEnergy = 1*eV (mma)
// 01-10-01, come back to BuildPhysicsTable(const G4ParticleDefinition&)
// 17-04-02, LowestEnergyLimit = 1*keV     
// 26-05-04, cross section parametrization improved for low energy :
//           Egamma <~ 15 keV (Laszlo) 
// 08-11-04, Remove Store/Retrieve tables (V.Ivanchenko)
// 09-03-05  Migrate to model interface 
//           and inherit from G4VEmProcess (V.Ivanchenko) 
// 04-05-05, Make class to be default (V.Ivanchenko)
// 09-09-06, modify SetModel(G4VEmModel*) (mma)
// 12-09-06, move SetModel(G4VEmModel*) in G4VEmProcess (mma)
//
// -----------------------------------------------------------------------------

#include "G4ComptonScattering.hh"
#include "G4KleinNishinaCompton.hh"
#include "G4Electron.hh"

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

using namespace std;

G4ComptonScattering::G4ComptonScattering(const G4String& processName,
  G4ProcessType type):G4VEmProcess (processName, type),
    isInitialised(false)
{
  SetProcessSubType(fComptonScattering);
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
 
G4ComptonScattering::~G4ComptonScattering()
{}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

G4bool G4ComptonScattering::IsApplicable(const G4ParticleDefinition& p)
{
  return (&p == G4Gamma::Gamma());
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

void G4ComptonScattering::InitialiseProcess(const G4ParticleDefinition*)
{
  if(!isInitialised) {
    isInitialised = true;
    SetBuildTableFlag(true);
    SetSecondaryParticle(G4Electron::Electron());
    if(!Model()) SetModel(new G4KleinNishinaCompton);
    Model()->SetLowEnergyLimit(MinKinEnergy());
    Model()->SetHighEnergyLimit(MaxKinEnergy());
    AddEmModel(1, Model());
  } 
}

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......

void G4ComptonScattering::PrintInfo()
{}         

//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo......
