Line data    Source code

       1             : /**************************************************************************
       2             :  * Copyright(c) 2009-2010, ALICE Experiment at CERN, All rights reserved. *
       3             :  *                                                                        *
       4             :  * Author: The ALICE Off-line Project.                                    *
       5             :  * Contributors are mentioned in the code where appropriate.              *
       6             :  *                                                                        *
       7             :  * Permission to use, copy, modify and distribute this software and its   *
       8             :  * documentation strictly for non-commercial purposes is hereby granted   *
       9             :  * without fee, provided that the above copyright notice appears in all   *
      10             :  * copies and that both the copyright notice and this permission notice   *
      11             :  * appear in the supporting documentation. The authors make no claims     *
      12             :  * about the suitability of this software for any purpose. It is          *
      13             :  * provided "as is" without express or implied warranty.                  *
      14             :  **************************************************************************/
      15             : 
      16             : /* $Id$ */
      17             : 
      18             : /////////////////////////////////////////////////////////////////////
      19             : // Helper class for 3D primary vertexing                           //
      20             : // Used by AliITSSortTrkl                                          //
      21             : // In each object the labels of the 2 paired tracklets             //
      22             : // are stored. DCA and crossing point coordinates are also stored. //
      23             : // Origin M.Masera (masera@to.infn.it)                             //
      24             : /////////////////////////////////////////////////////////////////////
      25             : 
      26             : #include <TMath.h>
      27             : #include "AliITSTracklPairs.h"
      28             : 
      29         118 : ClassImp(AliITSTracklPairs)
      30             : 
      31             : //______________________________________________________________________
      32           0 : AliITSTracklPairs::AliITSTracklPairs():TObject(),
      33           0 : fTrack1(0),
      34           0 : fTrack2(0),
      35           0 : fDCA(0.) {
      36             :   // Default constructor
      37             : 
      38           0 :   for(Int_t i=0;i<3;i++)fCross[i]=0.;
      39           0 : }
      40             : 
      41             : //______________________________________________________________________
      42           0 : AliITSTracklPairs::AliITSTracklPairs(Int_t t1, Int_t t2, Double_t dca, Double_t *coo):TObject(),
      43           0 : fTrack1(t1),
      44           0 : fTrack2(t2),
      45           0 : fDCA(dca) {
      46             :   // Standard constructor
      47             : 
      48           0 :   for(Int_t i=0;i<3;i++)fCross[i]=coo[i];
      49           0 : }
      50             : 
      51             : //______________________________________________________________________
      52           0 : AliITSTracklPairs::~AliITSTracklPairs(){
      53             :   // destructor
      54           0 : }
      55             : 
      56             : //______________________________________________________________________
      57             : Double_t AliITSTracklPairs::GetDistance(const AliITSTracklPairs& pair) const {
      58             :   // Get distance between the crossing point of pair and this
      59           0 :   Double_t point1[3];
      60           0 :   pair.GetCrossCoord(point1);
      61             :   Double_t dist = 0.;
      62           0 :   for(Int_t i=0; i<3; i++)dist+=(point1[i]-fCross[i])*(point1[i]-fCross[i]);
      63           0 :   dist=TMath::Sqrt(dist);
      64           0 :   return dist;
      65           0 : }