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