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//
// $Id: G4VeEnergyLoss.icc,v 1.3.2.1 2001/06/28 19:12:35 gunter Exp $
// GEANT4 tag $Name:  $
//
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....
// 
// 18/11/98, L. Urban
//  It is a modified version of G4VeEnergyLoss:
//  continuous energy loss with generation of subcutoff delta rays
// 
//....oooOO0OOooo........oooOO0OOooo........oooOO0OOooo........oooOO0OOooo....

inline G4double G4VeEnergyLoss::GetConstraints(
                                 const G4DynamicParticle* aParticle,
                                              G4Material* aMaterial)
{
  // 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();

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

  G4double KineticEnergy = aParticle->GetKineticEnergy();

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

  // compute the (random) Step limit
  if (fRangeNow>finalRange)
  {
    StepLimit = c1lim*fRangeNow+c2lim+c3lim/fRangeNow;
    //randomise this value
    if (rndmStepFlag) StepLimit = finalRange +
                          (StepLimit-finalRange)*G4UniformRand();
    if (StepLimit > fRangeNow) StepLimit = fRangeNow;
  }
  else StepLimit = fRangeNow;

  return StepLimit;
}

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

inline G4double G4VeEnergyLoss::GetContinuousStepLimit(
                                               const G4Track& track,
                                               G4double,
                                               G4double currentMinimumStep,
                                               G4double&)
{
 
  G4double Step =
    GetConstraints(track.GetDynamicParticle(),track.GetMaterial());

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

  return Step ;
}

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

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

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