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// $Id$
//
// G4TransitionRadiation  -- header file
//
// Class for description of  transition radiation generated
// by  charged particle crossed interface between material 1
// and material 2 (1 -> 2). Transition radiation could be of kind:
// - optical back
// - optical forward
// - X-ray   forward (for relativistic case Tkin/mass >= 10^2)
//
// GEANT 4 class header file --- Copyright CERN 1995
// CERB Geneva Switzerland
//
// for information related to this code, please, contact
// CERN, CN Division, ASD Group
// History:
// 18.12.97, V. Grichine (Vladimir.Grichine@cern.ch)
// 02.02.00, V.Grichine, new data fEnergy and fVarAngle for double
//                       numerical integration in inherited classes
// 03.06.03, V.Ivanchenko fix compilation warnings
// 28.07.05, P.Gumplinger add G4ProcessType to constructor

#ifndef G4TransitionRadiation_h
#define G4TransitionRadiation_h


#include "G4VDiscreteProcess.hh"
#include "G4Material.hh"
// #include "G4OpBoundaryProcess.hh"

class G4TransitionRadiation : public   G4VDiscreteProcess
{
public:

  G4TransitionRadiation( const G4String& processName = "TR",
			 G4ProcessType type = fElectromagnetic) ;

  virtual ~G4TransitionRadiation() ;

  // Methods

  G4bool IsApplicable(const G4ParticleDefinition& aParticleType);

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

  G4VParticleChange* PostStepDoIt(const G4Track&, const G4Step&);

  virtual
  G4double SpectralAngleTRdensity( G4double energy,
                                 G4double varAngle ) const = 0 ;

  G4double IntegralOverEnergy( G4double energy1,
			       G4double energy2,
			       G4double varAngle     ) const ;

  G4double IntegralOverAngle( G4double energy,
			      G4double varAngle1,
			      G4double varAngle2     ) const ;

  G4double AngleIntegralDistribution( G4double varAngle1,
				      G4double varAngle2     ) const ;

  G4double EnergyIntegralDistribution( G4double energy1,
				       G4double energy2     )  const   ;



  // Access functions

protected :

  G4int fMatIndex1 ;                   // index of the 1st material
  G4int fMatIndex2 ;                   // index of the 2nd material

  // private :

  G4double fGamma ;
  G4double fEnergy ;
  G4double fVarAngle ;

  // Local constants
  static const G4int fSympsonNumber ; // Accuracy of Sympson integration 10
  static const G4int fGammaNumber   ; // = 15
  static const G4int fPointNumber   ; // = 100

  G4double fMinEnergy ;                //  min TR energy
  G4double fMaxEnergy ;                //  max TR energy
  G4double fMaxTheta  ;                //  max theta of TR quanta

  G4double fSigma1 ;                   // plasma energy Sq of matter1
  G4double fSigma2 ;                   // plasma energy Sq of matter2

private:

// Operators
  G4TransitionRadiation(const G4TransitionRadiation& right) ;
  G4TransitionRadiation& operator=(const G4TransitionRadiation& right) ;

};

#endif   // G4TransitionRadiation_h