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// $Id: G4eLowEnergyLoss.icc,v 1.8 2006/06/29 19:37:44 gunter Exp $
// GEANT4 tag $Name: geant4-09-03-beta-cand-00 $
//
// ---------------------------------------------------------------
//      GEANT 4 class inlined methods file 
//
//      History: based on object model of
//      2nd December 1995, G.Cosmo
//      ------------ G4eLowEnergyLoss physics process ------------
//                  by Laszlo Urban, 20 March 1997
// ***************************************************************
// It is the first implementation of the NEW UNIFIED ENERGY LOSS PROCESS.
// It calculates the energy loss of e+/e-.
// -------------------------------------------------------------
//
// 08-09-98  cleanup
// 28-03-02  V.Ivanchenko add fluorescence flag
// 21-01-03  V.Ivanchenko cut per region
// 18-04-03  V.Ivanchenko finalRange redefinition
//
// ---------------------------------------------------------------

inline G4double G4eLowEnergyLoss::GetConstraints(
                                      const G4DynamicParticle* aParticle,
                                      const G4MaterialCutsCouple* couple)
{
  G4double StepLimit;
  // returns the Step limit
  // dRoverRange is the max. allowed relative range loss in one Step
  // it calculates dEdx and the range as well....

  const G4ParticleDefinition* ParticleType=aParticle->GetDefinition();

  Charge = aParticle->GetDefinition()->GetPDGCharge();
  if(Charge != lastCharge) lastCharge = Charge ;

  G4double KineticEnergy = aParticle->GetKineticEnergy();

  fdEdx = G4EnergyLossTables::GetDEDX(ParticleType,KineticEnergy,couple);
  fRangeNow =
           G4EnergyLossTables::GetRange(ParticleType,KineticEnergy,couple);

  G4double r = std::min(finalRange, couple->GetProductionCuts()
                 ->GetProductionCut(idxG4ElectronCut));

  if (fRangeNow > r) {
    StepLimit = dRoverRange*fRangeNow + r*(1.0 - dRoverRange)*(2.0 - r/fRangeNow);
    //randomise this value
    if (rndmStepFlag) StepLimit = finalRange + (StepLimit-finalRange)*G4UniformRand();
    if (StepLimit > fRangeNow) StepLimit = fRangeNow;
  }
  else StepLimit = fRangeNow;

  return StepLimit;
}

//

inline G4double G4eLowEnergyLoss::GetContinuousStepLimit(
                                               const G4Track& track,
                                               G4double,
                                               G4double currentMinimumStep,
                                               G4double&)
{

  G4double Step =
    GetConstraints(track.GetDynamicParticle(),track.GetMaterialCutsCouple());

  if ((Step>0.0)&&(Step<currentMinimumStep)) currentMinimumStep = Step;

  return Step ;
}

//
inline G4bool G4eLowEnergyLoss::IsApplicable(const G4ParticleDefinition&
                                                     particle)
{
  return(   (&particle == G4Electron::Electron())
           ||(&particle == G4Positron::Positron()) );
}

inline void G4eLowEnergyLoss::ActivateFluorescence(G4bool val)
{
  theFluo = val; 
}

inline G4bool G4eLowEnergyLoss::Fluorescence() const
{
  return theFluo;
}

//