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TrLinearExtrapolator.h

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#ifndef TRLINEAREXTRAPOLATOR_H 
#define TRLINEAREXTRAPOLATOR_H 1

// Include file
#include "GaudiAlg/GaudiTool.h"
#include "TrKernel/ITrExtrapolator.h"

// Forward declaration
class TrState;

class TrLinearExtrapolator: public GaudiTool,
                            virtual public ITrExtrapolator {

public:
  TrLinearExtrapolator( const std::string& type, 
                        const std::string& name, 
                        const IInterface* parent );

  virtual ~TrLinearExtrapolator();

  StatusCode propagate( TrState* state,
                        double z,
                        ParticleID& pid = ParticleID(211) );

  StatusCode propagate( TrState* state,
                        HepPlane3D& plane,
                        ParticleID& pid = ParticleID(211) );

  virtual const HepMatrix& transportMatrix() const;

private:

  HepMatrix m_F; 

  void extrapolate( TrState* state) const;

};

#endif // TRLINEAREXTRAPOLATOR_H

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