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#ifndef TransverseImpactPointExtrapolator_h_
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#define TransverseImpactPointExtrapolator_h_
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#include "TrackingTools/GeomPropagators/interface/Propagator.h"
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#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
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#include "DataFormats/GeometryVector/interface/GlobalVector.h"
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#include "DataFormats/GeometryCommonDetAlgo/interface/DeepCopyPointerByClone.h"
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#include "MagneticField/Engine/interface/MagneticField.h"
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class FreeTrajectoryState;
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class TrajectoryStateOnSurface;
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// class Propagator;
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class BoundPlane;
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template <class T> class ReferenceCountingPointer;
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/** Extrapolate to impact point with respect to vtx,
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* i.e. point of closest approach to vtx in 2D.
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* The surface of the returned TrajectoryStateOnSurface
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* is chosen centred on vtx;
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* the axes of the local coordinate system (x_loc, y_loc, z_loc) are
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* z_loc // trajectory direction in transverse plane at impact point;
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* x_loc normal to trajectory and along impact vector (impact point - vtx);
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* y_loc forms a right-handed system with the other axes.
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*/
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class TransverseImpactPointExtrapolator {
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public:
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/// constructor with default geometrical propagator
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TransverseImpactPointExtrapolator();
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/// constructor with default geometrical propagator
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TransverseImpactPointExtrapolator(const MagneticField* field);
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/// constructor with user-supplied propagator
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TransverseImpactPointExtrapolator(const Propagator& u);
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/// extrapolation with default (=geometrical) propagator
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TrajectoryStateOnSurface extrapolate(const FreeTrajectoryState& fts,
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const GlobalPoint& vtx) const;
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/// as above, but from TrajectoryStateOnSurface
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TrajectoryStateOnSurface extrapolate(const TrajectoryStateOnSurface tsos,
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const GlobalPoint& vtx) const;
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/// extrapolation with user-supplied propagator
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TrajectoryStateOnSurface extrapolate(const FreeTrajectoryState& fts,
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const GlobalPoint& vtx,
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const Propagator& u) const;
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/// as above, but from TrajectoryStateOnSurface
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TrajectoryStateOnSurface extrapolate(const TrajectoryStateOnSurface tsos,
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const GlobalPoint& vtx,
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const Propagator& u) const;
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private:
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/// extrapolation of (multi) TSOS with (internal or user-supplied) propagator
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TrajectoryStateOnSurface doExtrapolation (const TrajectoryStateOnSurface tsos,
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const GlobalPoint& vtx,
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const Propagator& u) const;
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/// extrapolation of (single) FTS with (internal or user-supplied) propagator
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TrajectoryStateOnSurface doExtrapolation (const FreeTrajectoryState& fts,
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const GlobalPoint& vtx,
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const Propagator& u) const;
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/// computation of the TIP surface
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ReferenceCountingPointer<BoundPlane> tipSurface (const GlobalPoint& position,
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const GlobalVector& momentum,
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const double& signedTransverseRadius,
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const GlobalPoint& vtx) const;
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private:
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DeepCopyPointerByClone<Propagator> thePropagator;
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};
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#endif
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