/afs/cern.ch/work/a/aaltunda/public/www/CMSSW_5_3_14/src/TrackingTools/GeomPropagators/interface/StraightLinePlaneCrossing.h

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#ifndef StraightLinePlaneCrossing_H_
#define StraightLinePlaneCrossing_H_

#include "DataFormats/GeometryVector/interface/Basic3DVector.h"
#include "DataFormats/TrajectorySeed/interface/PropagationDirection.h"

#include <utility>

class Plane;

class StraightLinePlaneCrossing {
public:
  typedef Basic3DVector<float>   PositionType;
  typedef Basic3DVector<float>   DirectionType;

public:
  StraightLinePlaneCrossing(const PositionType& point,
                            const DirectionType& momentum,
                            const PropagationDirection propDir = alongMomentum);
  // destructor
  ~StraightLinePlaneCrossing() {}

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

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

  std::pair<bool,PositionType> position(const Plane& plane) const;

private:
  //
  // single precision vectors sufficient for internal use
  //
//   typedef Basic3DVector<double>  PositionTypeDouble;
//   typedef Basic3DVector<double>  DirectionTypeDouble;
  typedef Basic3DVector<float>  PositionTypeDouble;
  typedef Basic3DVector<float>  DirectionTypeDouble;

  const PositionTypeDouble theX0;
  const PositionTypeDouble theP0;
  const PropagationDirection thePropDir;
};

#endif