/data/refman/pasoursint/CMSSW_5_3_1/src/RecoMuon/TrackerSeedGenerator/interface/L1MuonPixelTrackFitter.h

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#ifndef RecoMuon_TrackerSeedGenerator_L1MuonPixelTrackFitter_H
#define RecoMuon_TrackerSeedGenerator_L1MuonPixelTrackFitter_H

#include "RecoPixelVertexing/PixelTrackFitting/interface/PixelFitter.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"

#include "DataFormats/GeometryVector/interface/GlobalTag.h"
#include "DataFormats/GeometryVector/interface/Vector3DBase.h"
#include "DataFormats/GeometryVector/interface/Point3DBase.h"
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"

#include <vector>

namespace edm {class EventSetup;}
namespace reco { class Track;}

class TrackingRegion;
class TrackingRecHit;
class L1MuGMTCand;
class PixelRecoLineRZ;
class SeedingHitSet;

class L1MuonPixelTrackFitter : public PixelFitter {

public:
  class Circle {
  public:
    typedef Vector3DBase< long double, GlobalTag>  Vector;
    typedef  Point3DBase< long double, GlobalTag>  Point;
    Circle() : theValid(false) {}
    Circle(const GlobalPoint& h1, const GlobalPoint& h2, double curvature):theCurvature(curvature){
      Point p1(h1); Point p2(h2); Vector dp = (p2-p1)/2.; int charge = theCurvature > 0 ? 1 : -1;
      Vector ec = charge * dp.cross(Vector(0,0,1)).unit();
      long double dist_tmp = 1./theCurvature/theCurvature - dp.perp2();
      theValid = (dist_tmp > 0.);
      theCenter = p1+dp + ec*sqrt( fabs(dist_tmp ) );
    }
    bool   isValid() const { return theValid; }
    const  Point & center() const { return theCenter; }
    const long double & curvature() const { return theCurvature; }
  private:
    bool theValid;
    long double theCurvature;
    Point theCenter;
  };

public:
  L1MuonPixelTrackFitter() {}
  L1MuonPixelTrackFitter( const edm::ParameterSet& cfg);

  virtual ~L1MuonPixelTrackFitter(){}

  void setL1Constraint(const L1MuGMTCand& muon);
  void setPxConstraint(const SeedingHitSet & hits);

  virtual reco::Track* run( 
      const edm::EventSetup& es,
      const std::vector<const TrackingRecHit *>& hits, 
      const TrackingRegion& region) const;

  static double getBending( double invPt, double eta, int charge);
  static double getBendingError(double invPt, double eta);
private:

  double valInversePt( double phi0, double phiL1, double eta) const;
  double errInversePt(double invPt, double eta) const;

  double valPhi(const Circle &c, int charge) const;
  double errPhi(double invPt, double eta) const;

  double valCotTheta(const PixelRecoLineRZ& line) const;
  double errCotTheta(double invPt, double eta) const;

  double valZip(double curvature, const GlobalPoint& p0, const GlobalPoint& p1) const;
  double errZip(double invPt, double eta) const;

  double valTip(const Circle &c, double curvature) const;
  double errTip(double invPt, double eta) const;

  double findPt(double phi0, double phiL1, double eta, int charge) const;
  double deltaPhi( double phi1, double phi2) const;
  static void param( double eta, double &p1, double& p2, double& p3);

private:

  edm::ParameterSet theConfig;

  // L1 constraint
  double thePhiL1, theEtaL1; int theChargeL1;

  // Px constraint
  GlobalPoint theHit1, theHit2;

private:
  friend class L1Seeding;
};
#endif