TRecHit2DPosConstraint.h

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#ifndef RECOTRACKER_TRANSIENTRACKINGRECHIT_TRecHit2DPosConstraint_H
#define RECOTRACKER_TRANSIENTRACKINGRECHIT_TRecHit2DPosConstraint_H

#include "TrackingTools/TransientTrackingRecHit/interface/TransientTrackingRecHit.h"
#include "DataFormats/GeometryCommonDetAlgo/interface/ErrorFrameTransformer.h"



class TRecHit2DPosConstraint final : public TransientTrackingRecHit {
public:

  ~TRecHit2DPosConstraint() override {}

  AlgebraicVector parameters() const override {
    AlgebraicVector result(2);
    LocalPoint lp = localPosition();
    result[0] = lp.x();
    result[1] = lp.y();
    return result;
  }
  
  AlgebraicSymMatrix parametersError() const override {
    AlgebraicSymMatrix m(2);
    LocalError le( localPositionError());
    m[0][0] = le.xx();
    m[0][1] = le.xy();
    m[1][1] = le.yy();
    return m;
  }

  AlgebraicMatrix projectionMatrix() const override {
    AlgebraicMatrix theProjectionMatrix;
    theProjectionMatrix = AlgebraicMatrix( 2, 5, 0);
    theProjectionMatrix[0][3] = 1;
    theProjectionMatrix[1][4] = 1;
    return theProjectionMatrix;
  }
  int dimension() const override {return 2;}

  LocalPoint localPosition() const override {return pos_;}
  LocalError localPositionError() const override {return err_;}

  const TrackingRecHit * hit() const override {return nullptr;}//fixme return invalid
  TrackingRecHit * cloneHit() const override { return nullptr;}
  
  std::vector<const TrackingRecHit*> recHits() const override { return std::vector<const TrackingRecHit*>(); }
  std::vector<TrackingRecHit*> recHits() override { return std::vector<TrackingRecHit*>(); }
  bool sharesInput( const TrackingRecHit*, SharedInputType) const override { return false;}

  bool canImproveWithTrack() const override {return false;}

  virtual RecHitPointer clone (const TrajectoryStateOnSurface& ts) const {return RecHitPointer(clone());}

  const GeomDetUnit* detUnit() const override {return nullptr;}

  static RecHitPointer build( const LocalPoint& pos, const LocalError& err,
                  const Surface* surface) {
    return RecHitPointer( new TRecHit2DPosConstraint( pos, err, surface));
  }

  const Surface * surface() const override {return &(*surface_);}

  GlobalPoint globalPosition() const override { return  surface()->toGlobal(localPosition());}
  GlobalError globalPositionError() const override { return ErrorFrameTransformer().transform( localPositionError(), *surface() );}
  float errorGlobalR() const override { return std::sqrt(globalPositionError().rerr(globalPosition()));}
  float errorGlobalZ() const override { return std::sqrt(globalPositionError().czz()); }
  float errorGlobalRPhi() const override { return globalPosition().perp()*sqrt(globalPositionError().phierr(globalPosition())); }


private:
  const LocalPoint pos_;
  const LocalError err_;
  ConstReferenceCountingPointer<Surface> surface_;
  TRecHit2DPosConstraint(const LocalPoint& pos,
             const LocalError& err,
             const Surface* surface): 
    pos_(pos),err_(err),surface_(surface) {}

  TRecHit2DPosConstraint( const TRecHit2DPosConstraint& other ):
    pos_( other.localPosition() ),err_( other.localPositionError() ), surface_((other.surface())) {}

  TRecHit2DPosConstraint * clone() const override {
    return new TRecHit2DPosConstraint(*this);
  }

};

#endif