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"
 
#include <cassert>
 
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 {
    assert(hasParameters);
    return theCurvatureValue;
  }
 
  double errorCurvature() const {
    assert(hasParameters);
    return theCurvatureError;
  }
 
  double chi2() const {
    assert(hasParameters);
    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();
 
private:
  Rotation theRotation;
  int nPoints;
  long double theSum, theSumU, theSumUU, theSumV, theSumUV, theSumVV;
  bool hasParameters;
  double theCurvatureValue, theCurvatureError, theChi2;
};
 
#endif