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