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:
  using  PositionType = Basic3DVector<float>;
  using DirectionType = Basic3DVector<float>;

public:
  StraightLinePlaneCrossing(const PositionType& point,
                const DirectionType& momentum,
                const PropagationDirection propDir = alongMomentum) :
  theX0(point),
  theP0(momentum.unit()),
  thePropDir(propDir) {}

  // destructor
  ~StraightLinePlaneCrossing() {}

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

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

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

private:
  //
  // single precision vectors sufficient for internal use
  //

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

#endif