HelixBarrelCylinderCrossing.h

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#ifndef HelixBarrelCylinderCrossing_H
#define HelixBarrelCylinderCrossing_H

#include "DataFormats/GeometryVector/interface/Basic2DVector.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"

#include "FWCore/Utilities/interface/Visibility.h"

class Cylinder;

class HelixBarrelCylinderCrossing {

public:
  enum Solution {bothSol, bestSol, onlyPos};

  typedef double                   TmpType;
  typedef Basic2DVector<TmpType>   Point; // for private use only
  typedef Basic2DVector<TmpType>   Vector; // for private use only


  typedef GlobalPoint    PositionType;
  typedef GlobalVector   DirectionType;

  HelixBarrelCylinderCrossing( const GlobalPoint& startingPos,
                   const GlobalVector& startingDir,
                   double rho, PropagationDirection propDir, 
                   const Cylinder& cyl, Solution sol=bothSol);

  bool hasSolution() const { return theSolExists;}

  double pathLength() const { return theS;}

  PositionType position() const { return thePos;}
  
  PositionType position1() const { return thePos1;}

  PositionType position2() const { return thePos2;}


  DirectionType direction() const { return theDir;}

private:

  PositionType   thePos;
  DirectionType  theDir;
  double         theS;
  bool           theSolExists;


  PositionType   thePos1;
  PositionType   thePos2;


  std::pair<Vector,int> chooseSolution( const Point& p1, const Point& p2,
                    const PositionType& startingPos,
                    const DirectionType& startingDir, 
                    PropagationDirection propDir) dso_internal;

};

#endif