/data/refman/pasoursint/CMSSW_5_3_3/src/TrackingTools/GeomPropagators/interface/StraightLineBarrelCylinderCrossing.h

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#ifndef StraightLineBarrelCylinderCrossing_H
#define StraightLineBarrelCylinderCrossing_H

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

#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"

#include <utility>

class Cylinder;

class StraightLineBarrelCylinderCrossing {

public:
  StraightLineBarrelCylinderCrossing (const GlobalPoint& startingPos,
                                      const GlobalVector& startingDir,
                                      const PropagationDirection propDir);

  std::pair<bool,double> pathLength (const Cylinder& cyl) const;

  GlobalPoint position (const double s) const { return GlobalPoint(theX0+s*theP0);}

private:
  std::pair<bool,double> chooseSolution (const double s1, const double s2) const;

private:
  //
  // single precision is sufficient for intermediate vectors
  //
  typedef GlobalPoint   PositionType;
  typedef GlobalVector  DirectionType;
  typedef Basic2DVector<float>  PositionType2D;
  typedef Basic2DVector<float>  DirectionType2D;

  const PositionType   theX0;
  const DirectionType  theP0;
  const PropagationDirection thePropDir;
};

#endif