HelixLineExtrapolation.h

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#ifndef HelixLineExtrapolation_H
#define HelixLineExtrapolation_H

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

#include <utility>

class Line;

class HelixLineExtrapolation {
public:
  typedef Basic3DVector<float> PositionType;
  typedef Basic3DVector<float> DirectionType;
  typedef Basic3DVector<double> PositionTypeDouble;
  typedef Basic3DVector<double> DirectionTypeDouble;

public:
  virtual ~HelixLineExtrapolation() = default;
  //
  // the helix is passed to the constructor and does not appear in the interface
  //

  virtual std::pair<bool, double> pathLength(const GlobalPoint& point) const = 0;

  virtual std::pair<bool, double> pathLength(const Line& line) const = 0;

  virtual PositionType position(double s) const = 0;

  virtual DirectionType direction(double s) const = 0;
};

#endif