HelixForwardPlaneCrossing.h

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#ifndef HelixForwardPlaneCrossing_H_
#define HelixForwardPlaneCrossing_H_

#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"
#include "TrackingTools/GeomPropagators/interface/HelixPlaneCrossing.h"

class HelixForwardPlaneCrossing : public HelixPlaneCrossing {
public:
  HelixForwardPlaneCrossing(const PositionType& point,
                const DirectionType& direction,
                const float curvature,
                const PropagationDirection propDir = alongMomentum);
  // destructor
  virtual ~HelixForwardPlaneCrossing() {}

  virtual std::pair<bool,double> pathLength(const Plane& plane);

  virtual PositionType position(double s) const;

  virtual DirectionType direction(double s) const;

private:
  //
  // double precision vectors for internal use
  //
  typedef Basic3DVector<double>  PositionTypeDouble;
  typedef Basic3DVector<double>  DirectionTypeDouble;

  const double theX0,theY0,theZ0;
  double theCosPhi0,theSinPhi0;
  double theCosTheta,theSinTheta;
  const double theRho;

  const PropagationDirection thePropDir;

  mutable double theCachedS;
  mutable double theCachedDPhi;
  mutable double theCachedSDPhi;
  mutable double theCachedCDPhi;

  static const float theNumericalPrecision;
};

#endif