// ************************************************************************
// This file is property of and copyright by the ALICE HLT Project        *
// ALICE Experiment at CERN, All rights reserved.                         *
// See cxx source for full Copyright notice                               *
//                                                                        *
//*************************************************************************

#ifndef ALIHLTTPCCATRACKLINEARISATIONARBB_H
#define ALIHLTTPCCATRACKLINEARISATIONARBB_H

#include "AliHLTTPCCATrackParamArBB.h"

/**
 * @class AliHLTTPCCATrackLinearisation
 *
 * AliHLTTPCCATrackLinearisation class describes the parameters which are used
 * to linearise the transport equations for the track trajectory.
 *
 * The class is used during track (re)fit, when the AliHLTTPCTrackParam track is only
 * partially fitted, and there is some apriory knowledge about trajectory.
 * This apriory knowledge is used to linearise the transport equations.
 *
 * In case the track is fully fitted, the best linearisation point is
 * the track trajectory itself (AliHLTTPCCATrackLinearisation = AliHLTTPCTrackParam ).
 *
 */
class AliHLTTPCCATrackLinearisationArBB
{
  public:

    AliHLTTPCCATrackLinearisationArBB() {}
    AliHLTTPCCATrackLinearisationArBB( AliHLTTPCCATrackParamArBB t )
    {
      f32 MaxSin = .999f;
      f32 MinSin = -.999f;

      fSinPhi = arbb::min( MaxSin, arbb::max( MinSin, t.fP[2] ));
      fCosPhi = t.fSignCosPhi * arbb::sqrt( 1.f - t.fP[2] * t.fP[2] );
      fDzDs   = t.fP[3];
      fQPt    = t.fP[4];
    }

    dense<f32> SinPhi()      const { return fSinPhi; }
    dense<f32> CosPhi()      const { return fCosPhi; }
    dense<f32> DzDs()        const { return fDzDs; }
    dense<f32> QPt()         const { return fQPt; }

 public:
  dense<f32> fSinPhi; // SinPhi
  dense<f32> fCosPhi; // CosPhi
  dense<f32> fDzDs;   // DzDs
  dense<f32> fQPt;    // QPt
};

#endif