/data/refman/pasoursint/CMSSW_5_2_9/src/RecoPixelVertexing/PixelTriplets/interface/ThirdHitPredictionFromInvLine.h

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#ifndef ThirdHitPredictionFromInvLine_H
#define ThirdHitPredictionFromInvLine_H
#include "DataFormats/GeometryVector/interface/Basic2DVector.h"
#include "DataFormats/GeometryVector/interface/Basic3DVector.h"
#include "DataFormats/GeometrySurface/interface/TkRotation.h"

#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "RecoTracker/TkMSParametrization/interface/PixelRecoRange.h"


#include "DataFormats/GeometryVector/interface/Basic2DVector.h"
#include "DataFormats/GeometryVector/interface/Basic3DVector.h"
#include "DataFormats/GeometrySurface/interface/TkRotation.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "RecoTracker/TkMSParametrization/interface/PixelRecoRange.h"

class ThirdHitPredictionFromInvLine {

public:

  typedef TkRotation<double> Rotation;
  typedef PixelRecoRange<float> Range;

  ThirdHitPredictionFromInvLine(const GlobalPoint & P1, const GlobalPoint & P2, double errorRPhiP1 = 1., double errorRPhiP2 = 1. );

  int size() const { return nPoints;}

  void add(const GlobalPoint& p, double erroriRPhi =1.);

  void remove(const GlobalPoint& p, double erroriRPhi =1.);

  GlobalPoint crossing(double radius) const;

  double curvature() const { check(); return theCurvatureValue; }

  double errorCurvature() const { check(); return theCurvatureError; }

  double chi2() const {  check(); return theChi2; }

  void print() const;
private:

  template <class T> class MappedPoint {
  public:
    MappedPoint() : theU(0), theV(0), pRot(0) { }
    MappedPoint(const T & aU, const T & aV, const TkRotation<T> * aRot)
        : theU(aU), theV(aV), pRot(aRot) { }
    MappedPoint(const Basic2DVector<T> & point, const TkRotation<T> * aRot)
        : pRot(aRot) {
      T radius2 = point.mag2();
      Basic3DVector<T> rotated = (*pRot) * point;
      theU = rotated.x() / radius2;
      theV = rotated.y() / radius2;
    }
    T u() const {return theU; }
    T v() const {return theV; }
    Basic2DVector<T> unmap () const {
       T invRadius2 = theU*theU+theV*theV;
       Basic3DVector<T> tmp
           = (*pRot).multiplyInverse(Basic2DVector<T>(theU,theV));
       return Basic2DVector<T>( tmp.x()/invRadius2, tmp.y()/invRadius2);
    }
  private:
    T theU, theV;
    const TkRotation<T> * pRot;
  };

private:
  typedef MappedPoint<double> PointUV;
  void add(const ThirdHitPredictionFromInvLine::PointUV & point, double weight);
  void check() const;

private:
  Rotation theRotation;
  int    nPoints;
  long double theSum, theSumU, theSumUU, theSumV, theSumUV, theSumVV;
  mutable bool hasParameters;
  mutable double theCurvatureValue, theCurvatureError, theChi2; 
};


#endif