1 // $Id: AliHLTTPCCATrackConvertor.cxx 27042 2008-07-02 12:06:02Z richterm $
2 // **************************************************************************
3 // This file is property of and copyright by the ALICE HLT Project *
4 // ALICE Experiment at CERN, All rights reserved. *
6 // Primary Authors: Sergey Gorbunov <sergey.gorbunov@kip.uni-heidelberg.de> *
7 // Ivan Kisel <kisel@kip.uni-heidelberg.de> *
8 // for The ALICE HLT Project. *
10 // Permission to use, copy, modify and distribute this software and its *
11 // documentation strictly for non-commercial purposes is hereby granted *
12 // without fee, provided that the above copyright notice appears in all *
13 // copies and that both the copyright notice and this permission notice *
14 // appear in the supporting documentation. The authors make no claims *
15 // about the suitability of this software for any purpose. It is *
16 // provided "as is" without express or implied warranty. *
18 //***************************************************************************
21 #include "AliHLTTPCCATrackConvertor.h"
22 #include "AliExternalTrackParam.h"
23 #include "AliHLTTPCCATrackParam.h"
24 #include "AliHLTTPCCAMath.h"
27 bool AliHLTTPCCATrackConvertor::GetExtParam( const AliHLTTPCCATrackParam &T1, AliExternalTrackParam &T2, double alpha )
29 //* Convert from AliHLTTPCCATrackParam to AliExternalTrackParam parameterisation,
30 //* the angle alpha is the global angle of the local X axis
32 bool ok = T1.CheckNumericalQuality();
34 double par[5], cov[15];
35 for ( int i = 0; i < 5; i++ ) par[i] = T1.GetPar()[i];
36 for ( int i = 0; i < 15; i++ ) cov[i] = T1.GetCov()[i];
38 if ( par[2] > .99 ) par[2] = .99;
39 if ( par[2] < -.99 ) par[2] = -.99;
41 if ( T1.GetSignCosPhi() < 0 ) { // change direction
42 par[2] = -par[2]; // sin phi
43 par[3] = -par[3]; // DzDs
44 par[4] = -par[4]; // kappa
53 if ( CAMath::Abs( par[4] ) < 1.e-5 ) par[4] = 1.e-5; // some other software will crash if q/Pt==0
54 if ( CAMath::Abs( par[4] ) > 1./0.08 ) ok = 0; // some other software will crash if q/Pt is too big
56 T2.Set( ( double ) T1.GetX(), alpha, par, cov );
61 void AliHLTTPCCATrackConvertor::SetExtParam( AliHLTTPCCATrackParam &T1, const AliExternalTrackParam &T2 )
63 //* Convert from AliExternalTrackParam parameterisation
65 for ( int i = 0; i < 5; i++ ) T1.SetPar( i, T2.GetParameter()[i] );
66 for ( int i = 0; i < 15; i++ ) T1.SetCov( i, T2.GetCovariance()[i] );
68 if ( T1.SinPhi() > .99 ) T1.SetSinPhi( .99 );
69 if ( T1.SinPhi() < -.99 ) T1.SetSinPhi( -.99 );
70 T1.SetSignCosPhi( 1 );