RKPropagatorInS.h

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#ifndef RKPropagatorInS_H
#define RKPropagatorInS_H

#include "TrackingTools/GeomPropagators/interface/Propagator.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "DataFormats/GeometryVector/interface/Basic3DVector.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
#include "DataFormats/TrajectoryState/interface/TrackCharge.h"
#include "MagneticField/VolumeGeometry/interface/MagVolume.h"
#include "FWCore/Utilities/interface/Visibility.h"

class GlobalTrajectoryParameters;
class GlobalParametersWithPath;
class MagVolume;
class RKLocalFieldProvider;
class CartesianStateAdaptor;

class RKPropagatorInS final : public Propagator {
public:
  // RKPropagatorInS( PropagationDirection dir = alongMomentum) : Propagator(dir), theVolume(0) {}
  // tolerance (see below) used to be 1.e-5 --> this was observed to cause problems with convergence
  // when propagating to cylinder with large radius (~10 meter) MM 22/6/07

  explicit RKPropagatorInS(const MagVolume& vol, PropagationDirection dir = alongMomentum, double tolerance = 5.e-5)
      : Propagator(dir), theVolume(&vol), theTolerance(tolerance) {}

  ~RKPropagatorInS() override {}

  using Propagator::propagate;
  using Propagator::propagateWithPath;

private:
  std::pair<TrajectoryStateOnSurface, double> propagateWithPath(const FreeTrajectoryState&,
                                                                const Plane&) const override;

  std::pair<TrajectoryStateOnSurface, double> propagateWithPath(const FreeTrajectoryState&,
                                                                const Cylinder&) const override;

public:
  Propagator* clone() const override;

  const MagneticField* magneticField() const override { return theVolume; }

private:
  typedef std::pair<TrajectoryStateOnSurface, double> TsosWP;

  const MagVolume* theVolume;
  double theTolerance;

  GlobalTrajectoryParameters gtpFromLocal(const Basic3DVector<float>& lpos,
                                          const Basic3DVector<float>& lmom,
                                          TrackCharge ch,
                                          const Surface& surf) const dso_internal;

  GlobalTrajectoryParameters gtpFromVolumeLocal(const CartesianStateAdaptor& state,
                                                TrackCharge charge) const dso_internal;

  RKLocalFieldProvider fieldProvider() const;
  RKLocalFieldProvider fieldProvider(const Cylinder& cyl) const dso_internal;

  PropagationDirection invertDirection(PropagationDirection dir) const dso_internal;

  Basic3DVector<double> rkPosition(const GlobalPoint& pos) const dso_internal;
  Basic3DVector<double> rkMomentum(const GlobalVector& mom) const dso_internal;
  GlobalPoint globalPosition(const Basic3DVector<float>& pos) const dso_internal;
  GlobalVector globalMomentum(const Basic3DVector<float>& mom) const dso_internal;

  GlobalParametersWithPath propagateParametersOnPlane(const FreeTrajectoryState& ts,
                                                      const Plane& plane) const dso_internal;
  GlobalParametersWithPath propagateParametersOnCylinder(const FreeTrajectoryState& ts,
                                                         const Cylinder& cyl) const dso_internal;
};

#endif