/data/refman/pasoursint/CMSSW_5_2_9/src/TrackingTools/PatternTools/interface/ClosestApproachOnHelices.h

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#ifndef _ClosestApproachOnHelices_H_
#define _ClosestApproachOnHelices_H_

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include <utility>

class FreeTrajectoryState;
class TrajectoryStateOnSurface;

class ClosestApproachOnHelices {

public:

  ClosestApproachOnHelices() {}

  virtual ~ClosestApproachOnHelices() {}


  virtual bool calculate(const TrajectoryStateOnSurface & sta, 
         const TrajectoryStateOnSurface & stb) = 0;

  virtual bool calculate(const FreeTrajectoryState & sta,
        const FreeTrajectoryState & stb) = 0;

  virtual bool status() const = 0;

  virtual std::pair<GlobalPoint, GlobalPoint> points() const = 0;

  virtual GlobalPoint crossingPoint() const = 0;

  virtual float distance() const = 0;

  virtual ClosestApproachOnHelices * clone() const = 0;

};

#endif