AnalyticalImpactPointExtrapolator.h

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#ifndef AnalyticalImpactPointExtrapolator_h_
#define AnalyticalImpactPointExtrapolator_h_

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"

#include "DataFormats/GeometryCommonDetAlgo/interface/DeepCopyPointerByClone.h"
#include "TrackingTools/GeomPropagators/interface/Propagator.h"

class FreeTrajectoryState;
class TrajectoryStateOnSurface;
class IterativeHelixExtrapolatorToLine;
class MagneticField; 

class AnalyticalImpactPointExtrapolator {

public:

  AnalyticalImpactPointExtrapolator ( const MagneticField* field);

  AnalyticalImpactPointExtrapolator (const Propagator&, const MagneticField*);

  TrajectoryStateOnSurface extrapolate (const FreeTrajectoryState& fts, 
                    const GlobalPoint& vtx) const;
  TrajectoryStateOnSurface extrapolate (const TrajectoryStateOnSurface tsos, 
                        const GlobalPoint& vtx) const;

private:
  TrajectoryStateOnSurface extrapolateFullState(const TrajectoryStateOnSurface tsos, 
                        const GlobalPoint& vertex) const;
  TrajectoryStateOnSurface extrapolateSingleState(const FreeTrajectoryState& fts, 
                          const GlobalPoint& vertex) const;
  bool propagateWithHelix (const IterativeHelixExtrapolatorToLine& extrapolator,
               const GlobalPoint& vertex,
               GlobalPoint& x, GlobalVector& p, double& s) const;

private:
  DeepCopyPointerByClone<Propagator> thePropagator;
  const MagneticField* theField;
};

#endif