/data/refman/pasoursint/CMSSW_4_4_5_patch3/src/TrackingTools/GeomPropagators/interface/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 : 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);

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

  virtual PositionType position( double s) const;

  virtual DirectionType direction( double s) const;

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