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// $Id: G4StepLimiterPerRegion.cc,v 1.4 2007/05/16 16:27:53 vnivanch Exp $
// GEANT4 tag $Name:  $
//
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#include "G4StepLimiterPerRegion.hh"
#include "G4StepLimiterMessenger.hh"
#include "G4VPhysicalVolume.hh"
#include "Histo.hh"

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G4StepLimiterPerRegion::G4StepLimiterPerRegion(const G4String& processName)
 : G4VDiscreteProcess(processName),
   MaxChargedStep(DBL_MAX)
{
  pMess = new G4StepLimiterMessenger(this);
  gasVolume = Histo::GetPointer()->GasVolume();
}

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G4StepLimiterPerRegion::~G4StepLimiterPerRegion() 
{ 
  delete pMess; 
}

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G4bool G4StepLimiterPerRegion::IsApplicable(const G4ParticleDefinition& particle)
{
  return (particle.GetPDGCharge() != 0. && !(particle.IsShortLived()));
}

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void G4StepLimiterPerRegion::SetMaxStep(G4double step) 
{
  MaxChargedStep = step;
}

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G4double G4StepLimiterPerRegion::PostStepGetPhysicalInteractionLength(
                                              const G4Track& aTrack,
                                                    G4double,
                                                    G4ForceCondition* condition )
{
  // condition is set to "Not Forced"
  *condition = NotForced;
  ProposedStep = MaxChargedStep;
  if(aTrack.GetVolume() == gasVolume) ProposedStep = 0.0;
  return ProposedStep;
}

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G4VParticleChange* G4StepLimiterPerRegion::PostStepDoIt(const G4Track& aTrack, 
							const G4Step&)
{
  aParticleChange.Initialize(aTrack);
  if(aTrack.GetVolume() == gasVolume) 
    aParticleChange.ProposeTrackStatus(fStopAndKill);
  return &aParticleChange;
}

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