GFKalman.h

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/* Copyright 2008-2010, Technische Universitaet Muenchen,
   Authors: Christian Hoeppner & Sebastian Neubert

   This file is part of GENFIT.

   GENFIT is free software: you can redistribute it and/or modify
   it under the terms of the GNU Lesser General Public License as published
   by the Free Software Foundation, either version 3 of the License, or
   (at your option) any later version.

   GENFIT is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU Lesser General Public License for more details.

   You should have received a copy of the GNU Lesser General Public License
   along with GENFIT.  If not, see <http://www.gnu.org/licenses/>.
*/
#ifndef GFKALMAN_H
#define GFKALMAN_H

#include <map>
#include <iostream>

#include "TMatrixT.h"


class GFAbsRecoHit;
class GFAbsTrackRep;
class GFTrack;

class GFKalman {
public:

  //friend class KalmanTester; // gives the Tester access to private methods

  // Constructors/Destructors ---------
  GFKalman();
  ~GFKalman();

  // Operators
  inline void operator()(GFTrack* track){processTrack(track);}
  
  inline void operator()(std::pair<int,GFTrack*> tr){processTrack(tr.second);}

  // Operations ----------------------

  void setLazy(Int_t){std::cerr<<"Using outdates setLazy method of class GFKalman:"<<std::endl;}

  void setNumIterations(Int_t i){fNumIt=i;}

  void processTrack(GFTrack* trk);

  void fittingPass(GFTrack*,int dir); // continues track from lastHitInFit

  double getChi2Hit(GFAbsRecoHit*, GFAbsTrackRep*);

  void setInitialDirection(int d){fInitialDirection=d;}

  void setBlowUpFactor(double f){fBlowUpFactor=f;}

  // Private Methods -----------------
private:
  void processHit(GFTrack*, int, int, int);
  
  void switchDirection(GFTrack* trk); // switches the direction of propagation for all reps

  TMatrixT<double> calcGain(const TMatrixT<double>& cov, 
                                                const TMatrixT<double>& HitCov,
                                                const TMatrixT<double>& H);

  double chi2Increment(const TMatrixT<double>& r,const TMatrixT<double>& H,
                       const TMatrixT<double>& cov,const TMatrixT<double>& V);

  void blowUpCovs(GFTrack* trk);

  int fInitialDirection;
  Int_t fNumIt;
  double fBlowUpFactor;
  bool fSmooth;




};


#endif