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// $Id: G4VeEnergyLoss.icc,v 1.14 2006/06/29 19:51:50 gunter Exp $
// GEANT4 tag $Name: geant4-08-02 $
//
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// 
// 18/11/98 L. Urban
//          It is a modified version of G4VeEnergyLoss:
//          continuous energy loss with generation of subcutoff delta rays
// 08-11-01 Charge,lastCharge not data members, L.Urban
// 15-01-03 Migrade to cut per region (V.Ivanchenko)
// 08-04-03 finalRange is region aware (V.Ivanchenko)
//
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inline G4double G4VeEnergyLoss::GetConstraints(
                                 const G4DynamicParticle* aParticle,
                                 const G4MaterialCutsCouple* couple)
{
  // returns the Step limit
  // dRoverRange is the max. allowed relative range loss in one Step
  // it calculates dEdx and the range as well....

  G4double StepLimit;
  const G4ParticleDefinition* ParticleType=aParticle->GetDefinition();

  G4double KineticEnergy = aParticle->GetKineticEnergy();

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

  // compute the Step limit
  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 = r + (StepLimit-r)*G4UniformRand();
    if (StepLimit > fRangeNow) StepLimit = fRangeNow;
  }
  else StepLimit = fRangeNow;

  return StepLimit;
}

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inline G4double G4VeEnergyLoss::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 ;
}

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inline G4bool G4VeEnergyLoss::IsApplicable(const G4ParticleDefinition&
                                                     particle)
{
   return(   (&particle == G4Electron::Electron())
           ||(&particle == G4Positron::Positron()) );
}

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