HelixBarrelPlaneCrossingByCircle.h

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#ifndef HelixBarrelPlaneCrossingByCircle_H
#define HelixBarrelPlaneCrossingByCircle_H
 
#include "TrackingTools/GeomPropagators/interface/HelixPlaneCrossing.h"
#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
 
class HelixBarrelPlaneCrossingByCircle final : public HelixPlaneCrossing {
public:
  HelixBarrelPlaneCrossingByCircle(const PositionType& pos,
                                   const DirectionType& dir,
                                   double rho,
                                   PropagationDirection propDir = alongMomentum);
 
  HelixBarrelPlaneCrossingByCircle(const GlobalPoint& pos,
                                   const GlobalVector& dir,
                                   double rho,
                                   PropagationDirection propDir = alongMomentum);
 
  std::pair<bool, double> pathLength(const Plane&) override;
 
  PositionType position(double s) const override;
 
  DirectionType direction(double s) const override;
 
private:
  typedef Basic2DVector<double> Vector2D;
 
  PositionType theStartingPos;
  DirectionType theStartingDir;
  double theRho;
  PropagationDirection thePropDir;
 
  double theCosTheta;
  double theSinTheta;
  double theXCenter;
  double theYCenter;
 
  // caching of the solution for faster access
  double theS;
  Vector2D theD;
  double theDmag;
 
  // internal communication - not very clean
  double theActualDir;
  bool useStraightLine;
 
  void init();
  bool chooseSolution(const Vector2D& d1, const Vector2D& d2);
};
 
#endif