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// $Id: G4VTransitionRadiation.hh,v 1.3 2006/06/29 19:55:53 gunter Exp $
// GEANT4 tag $Name: geant4-09-03-cand-01 $
//
// G4VTransitionRadiation  -- header file
//
// Generic process of transition radiation
//
// History:
// 29.02.04, V.Ivanchenko created
// 28.07.05, P.Gumplinger add G4ProcessType to constructor

#ifndef G4VTransitionRadiation_h
#define G4VTransitionRadiation_h


#include "G4VDiscreteProcess.hh"
#include "G4Track.hh"
#include "G4ForceCondition.hh"
#include "globals.hh"
#include <vector>

class G4Material;
class G4Region;
class G4VTRModel;
class G4particleDefinition;

class G4VTransitionRadiation : public   G4VDiscreteProcess
{
public:

// Constructors
  G4VTransitionRadiation( const G4String& processName = "TR",
                                G4ProcessType type = fElectromagnetic);


// Destructor
  virtual ~G4VTransitionRadiation() ;

  virtual G4bool IsApplicable(const G4ParticleDefinition& aParticleType);

  virtual G4double GetMeanFreePath(const G4Track& track, G4double,
				         G4ForceCondition* condition);

  virtual G4VParticleChange* PostStepDoIt(const G4Track& track,
 				          const G4Step& step);

  virtual void PrintInfoDefinition();
  // Print out of the class parameters

  void SetRegion(const G4Region* reg);

  void SetModel(G4VTRModel* m);

// private :

  void Clear();

  // hide assignment operator
  G4VTransitionRadiation & operator=(const G4VTransitionRadiation &right);
  G4VTransitionRadiation(const G4VTransitionRadiation&);

  std::vector<const G4Material*>  materials;
  std::vector<G4double>           steps;
  std::vector<G4ThreeVector>      normals;

  G4ThreeVector     startingPosition;
  G4ThreeVector     startingDirection;
  const G4Region*   region;
  G4VTRModel*       model;

  G4int             nSteps;

  G4double          gammaMin;
  G4double          cosDThetaMax;

};

inline G4double G4VTransitionRadiation::GetMeanFreePath(
                                const G4Track& track, G4double,
                                      G4ForceCondition* condition)
{
  if(nSteps > 0) {
    *condition = StronglyForced;
  } else {
    *condition = NotForced;
    if(track.GetKineticEnergy()/track.GetDefinition()->GetPDGMass() + 1.0 > gammaMin &&
       track.GetVolume()->GetLogicalVolume()->GetRegion() == region) {
         *condition = StronglyForced;
    }
  }
  return DBL_MAX;      // so TR doesn't limit mean free path
}


#endif   // G4VTransitionRadiation_h
