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:
  //
  // 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