/data/git/CMSSW_5_3_11_patch5/src/TrackingTools/GeomPropagators/interface/StraightLineCylinderCrossing.h

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#ifndef StraightLineCylinderCrossing_H
#define StraightLineCylinderCrossing_H

#include "DataFormats/GeometryVector/interface/LocalPoint.h"
#include "DataFormats/GeometryVector/interface/LocalVector.h"
#include "DataFormats/GeometryVector/interface/Basic2DVector.h"

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

#include <utility>

class Cylinder;

class StraightLineCylinderCrossing {

public:
  StraightLineCylinderCrossing (const LocalPoint& startingPos,
                                const LocalVector& startingDir,
                                const PropagationDirection propDir=alongMomentum,
                                double tolerance=0);

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

  LocalPoint position (const double s) const { return LocalPoint(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 LocalPoint   PositionType;
  typedef LocalVector  DirectionType;
  typedef Basic2DVector<float>  PositionType2D;
  typedef Basic2DVector<float>  DirectionType2D;

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

#endif