source: trunk/examples/advanced/underground_physics/src/DMXMinEkineCuts.cc @ 1304

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// $Id: DMXMinEkineCuts.cc,v 1.6 2006/06/29 16:26:39 gunter Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
// 
// --------------------------------------------------------------
//      GEANT 4 class implementation file 
//
//      History: first implementation, based on object model of
//      2nd December 1995, G.Cosmo
// --------------------------------------------------------------
//                   15 April 1998 M.Maire
// --------------------------------------------------------------

#include "DMXMinEkineCuts.hh"

#include "G4Step.hh"
#include "G4UserLimits.hh"
#include "G4VParticleChange.hh"
#include "G4EnergyLossTables.hh"

DMXMinEkineCuts::DMXMinEkineCuts(const G4String& aName)
  : DMXSpecialCuts(aName)
{
   if (verboseLevel>1) {
     G4cout << GetProcessName() << " is created "<< G4endl;
   }
   SetProcessType(fUserDefined);
}

DMXMinEkineCuts::~DMXMinEkineCuts()
{}

DMXMinEkineCuts::DMXMinEkineCuts(DMXMinEkineCuts&)
  : DMXSpecialCuts()
{}


G4double DMXMinEkineCuts::PostStepGetPhysicalInteractionLength(
                             const G4Track& aTrack,
                             G4double ,
                             G4ForceCondition* condition
                            )
{
  // condition is set to "Not Forced"
  *condition = NotForced;

   G4double     proposedStep = DBL_MAX;
   // get the pointer to UserLimits
   G4UserLimits* pUserLimits = aTrack.GetVolume()->GetLogicalVolume()->GetUserLimits();
   const G4DynamicParticle* aParticle = aTrack.GetDynamicParticle();
   G4ParticleDefinition* aParticleDef = aTrack.GetDefinition();
  
   if (pUserLimits && aParticleDef->GetPDGCharge() != 0.0) {
     //min kinetic energy
     G4double temp = DBL_MAX;
     G4double    eKine     = aParticle->GetKineticEnergy();
     const G4MaterialCutsCouple* couple = aTrack.GetMaterialCutsCouple();
     G4double eMin = pUserLimits->GetUserMinEkine(aTrack);

     G4double    rangeNow = DBL_MAX;

     rangeNow = G4EnergyLossTables::GetRange(aParticleDef,eKine,couple);

     if (eKine < eMin ) {
       proposedStep = 0.;
     } else {
       // charged particles only
       G4double rangeMin = G4EnergyLossTables::GetRange(aParticleDef,eMin,couple);
       temp = rangeNow - rangeMin;
       if (proposedStep > temp) proposedStep = temp;
     }
   }
   return proposedStep;
}