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// $Id: G4ErrorTrackLengthTarget.hh,v 1.2 2007/05/29 14:41:35 gcosmo Exp $
// GEANT4 tag $Name: geant4-09-03 $
//
//
// Class Description:
//
// G4ErrorTarget class: limits step when track length is bigger than
// theMaximumTrackLength. It is a G4VDiscreteProcess: limits the step in
// PostStepGetPhysicalInteractionLength().

// History:
// - Created. P. Arce, September 2004
// --------------------------------------------------------------------

#ifndef G4ErrorTrackLengthTarget_hh
#define G4ErrorTrackLengthTarget_hh

#include "G4ios.hh" 
#include "globals.hh"
#include "G4VDiscreteProcess.hh"
#include "G4PhysicsTable.hh"
#include "G4PhysicsLogVector.hh"
#include "G4ElementTable.hh"
#include "G4Step.hh" 
#include "G4ErrorTarget.hh"

//---------------------------------------------------------------------------- 

class G4ErrorTrackLengthTarget : public G4VDiscreteProcess,
                                 public G4ErrorTarget
{
 public:  // with description

  G4ErrorTrackLengthTarget(const G4double maxTrkLength );
    // Constructs and add this process to G4ProcessManager of all particles
  virtual ~G4ErrorTrackLengthTarget(){}
  
    // These methods are dummy, as the step limitation is done in the
    // PostStepGetPhysicalInteractionLength().

  virtual G4double GetDistanceFromPoint( const G4ThreeVector&,
                                         const G4ThreeVector& ) const
    { return DBL_MAX; }   
  virtual G4double GetDistanceFromPoint( const G4ThreeVector& ) const
    { return DBL_MAX; } 

  virtual G4double
  PostStepGetPhysicalInteractionLength( const G4Track& track,
                                              G4double previousStepSize,
                                              G4ForceCondition* condition );
    // Checks if the maximum track length has been reached

  virtual  G4double GetMeanFreePath(const class G4Track & track,
                                    G4double, G4ForceCondition *);
    // Mean free path = theMaximumTrackLength - track.GetTrackLength()

   virtual G4VParticleChange* PostStepDoIt( const G4Track&, const G4Step& );
                       
   virtual void Dump( const G4String& msg ) const;

 private:

  G4double theMaximumTrackLength;
};
   
#endif