CbmStsTrackFinderIdeal.cxx

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/* Copyright (C) 2005-2020 GSI Helmholtzzentrum fuer Schwerionenforschung, Darmstadt
   SPDX-License-Identifier: GPL-3.0-only
   Authors: Denis Bertini [committer], Volker Friese, Florian Uhlig */
 
// -------------------------------------------------------------------------
// -----                CbmStsTrackFinderIdeal source file             -----
// -----                  Created 01/02/05  by V. Friese               -----
// -------------------------------------------------------------------------
 
#include "CbmStsTrackFinderIdeal.h"
 
#include "CbmStsHit.h"
#include "CbmStsTrack.h"
 
// CBM includes
#include "CbmMCTrack.h"
#include "FairMCPoint.h"
#include "FairRootManager.h"
 
// ROOT includes
#include "TClonesArray.h"
 
// C++ includes
#include <iomanip>
#include <iostream>
#include <map>
 
using std::cout;
using std::endl;
using std::left;
using std::map;
using std::setw;
 
 
// -----   Default constructor   -------------------------------------------
CbmStsTrackFinderIdeal::CbmStsTrackFinderIdeal() : CbmStsTrackFinder(), fMCTrackArray(NULL), fMCPointArray(NULL)
{
  fVerbose = 1;
  fName    = "STSTrackFinderIdeal";
}
// -------------------------------------------------------------------------
 
 
// -----   Standard constructor   ------------------------------------------
CbmStsTrackFinderIdeal::CbmStsTrackFinderIdeal(Int_t verbose)
  : CbmStsTrackFinder()
  , fMCTrackArray(NULL)
  , fMCPointArray(NULL)
{
  fVerbose = verbose;
  fName    = "STSTrackFinderIdeal";
}
// -------------------------------------------------------------------------
 
 
// -----   Destructor   ----------------------------------------------------
CbmStsTrackFinderIdeal::~CbmStsTrackFinderIdeal() {}
// -------------------------------------------------------------------------
 
 
// -----   Public method Init   --------------------------------------------
void CbmStsTrackFinderIdeal::Init()
{
 
  // Get and check FairRootManager
  FairRootManager* ioman = FairRootManager::Instance();
  if (!ioman) {
    cout << "-E- " << fName << "::Init: "
         << "RootManager not instantised!" << endl;
    return;
  }
 
  // Get MCTrack array
  fMCTrackArray = (TClonesArray*) ioman->GetObject("MCTrack");
  if (!fMCTrackArray) {
    cout << "-E- " << fName << "::Init: No MCTrack array!" << endl;
    return;
  }
 
  // Get MCPoint array
  fMCPointArray = (TClonesArray*) ioman->GetObject("StsPoint");
  if (!fMCPointArray) {
    cout << "-E- " << fName << "::Init: No MCPoint array!" << endl;
    return;
  }
}
// -------------------------------------------------------------------------
 
 
// -----   Public method DoFind   ------------------------------------------
Int_t CbmStsTrackFinderIdeal::DoFind()
{
 
  Bool_t success = kTRUE;
 
  // Check pointers
  if (!fMCTrackArray) {
    cout << "-E- " << fName << "::DoFind: "
         << "MCTrack array missing! " << endl;
    return -1;
  }
  if (!fMCPointArray) {
    cout << "-E- " << fName << "::DoFind: "
         << "MCPoint array missing! " << endl;
    return -1;
  }
 
  if (!fStsHits) {
    cout << "-E- " << fName << "::DoFind: "
         << "Hit array missing! " << endl;
    return -1;
  }
 
  if (!fTracks) {
    cout << "-E- " << fName << "::DoFind: "
         << "Track array missing! " << endl;
    return -1;
  }
 
  // Initialise control counters
  Int_t nNoMCTrack  = 0;
  Int_t nNoTrack    = 0;
  Int_t nNoStsPoint = 0;
  Int_t nNoStsHit   = 0;
 
  // Create pointers to StsHit and StsPoint
  CbmStsHit* pHit    = NULL;
  FairMCPoint* pMCpt = NULL;
  CbmMCTrack* pMCtr  = NULL;
  CbmStsTrack* pTrck = NULL;
 
  // Number of Sts hits
  Int_t nHits = fStsHits->GetEntriesFast();
  ;
 
  // Declare some variables outside the loops
  Int_t ptIndex      = 0;  // MCPoint index
  Int_t mcTrackIndex = 0;  // MCTrack index
  Int_t trackIndex   = 0;  // StsTrack index
 
 
  // Create STL map from MCtrack index to number of valid StsHits
  map<Int_t, Int_t> hitMap;
 
  // Loop over Sts hits
  for (Int_t iHit = 0; iHit < nHits; iHit++) {
    pHit = (CbmStsHit*) fStsHits->At(iHit);
    if (!pHit) continue;
    ptIndex = pHit->GetRefId();
    if (ptIndex < 0) continue;  // fake or background hit
    pMCpt = (FairMCPoint*) (fMCPointArray->At(ptIndex));
    if (!pMCpt) continue;
    mcTrackIndex = pMCpt->GetTrackID();
    hitMap[mcTrackIndex]++;
  }
 
  // Create STL map from MCTrack index to StsTrack index
  map<Int_t, Int_t> trackMap;
 
  // Create StsTracks for reconstructable MCTracks
  Int_t nMCacc    = 0;  // accepted MCTracks
  Int_t nTracks   = 0;  // reconstructable MCTracks
  Int_t nMCTracks = fMCTrackArray->GetEntriesFast();
  for (Int_t iMCTrack = 0; iMCTrack < nMCTracks; iMCTrack++) {
    pMCtr = (CbmMCTrack*) fMCTrackArray->At(iMCTrack);
    if (!pMCtr) continue;
    if (pMCtr->GetNPoints(ECbmModuleId::kSts) < 3) continue;
    nMCacc++;
    if (hitMap[iMCTrack] < 3) continue;
    new ((*fTracks)[nTracks]) CbmStsTrack();
    if (fVerbose > 1)
      cout << "-I- " << fName << ": StsTrack " << nTracks << " created from MCTrack " << iMCTrack << " ("
           << pMCtr->GetNPoints(ECbmModuleId::kSts) << " StsPoints)" << endl;
    trackMap[iMCTrack] = nTracks++;
  }
 
  if (fVerbose > 2) cout << "-I- " << GetName() << ": " << endl;
 
  // Loop over Sts hits. Get corresponding MCPoint and MCTrack index
  for (Int_t iHit = 0; iHit < nHits; iHit++) {
    pHit = (CbmStsHit*) fStsHits->At(iHit);
    if (!pHit) {
      cout << "-E- " << fName << "::DoFind: Empty slot "
           << "in StsHitArray at position " << iHit << endl;
      nNoStsHit++;
      success = kFALSE;
      continue;
    }
    ptIndex = pHit->GetRefId();
    if (ptIndex < 0) continue;  // fake or background hit
    pMCpt = (FairMCPoint*) (fMCPointArray->At(ptIndex));
    if (!pMCpt) {
      cout << "-E- " << fName << "::DoFind: No reference "
           << "MCPoint " << ptIndex << " for hit " << iHit << endl;
      nNoStsPoint++;
      success = kFALSE;
      continue;
    }
    mcTrackIndex = pMCpt->GetTrackID();
    if (mcTrackIndex < 0 || mcTrackIndex > nMCTracks) {
      cout << "-E- " << fName << "::DoFind: "
           << "MCTrack index out of range. " << mcTrackIndex << " " << nMCTracks << endl;
      nNoMCTrack++;
      success = kFALSE;
      continue;
    }
    if (trackMap.find(mcTrackIndex) == trackMap.end()) continue;
    trackIndex = trackMap[mcTrackIndex];
    pTrck      = (CbmStsTrack*) fTracks->At(trackIndex);
    if (!pTrck) {
      cout << "-E- " << fName << "::DoFind: "
           << "No StsTrack pointer. " << iHit << " " << ptIndex << " " << mcTrackIndex << " " << trackIndex << endl;
      nNoTrack++;
      success = kFALSE;
      continue;
    }
    pTrck->AddStsHit(iHit);
    if (fVerbose > 2)
      cout << "Sts Hit " << iHit << " from StsPoint " << ptIndex << " (MCTrack " << mcTrackIndex
           << ") added to StsTrack " << trackIndex << endl;
  }
 
 
  if (fVerbose) {
    cout << endl;
    cout << "-------------------------------------------------------" << endl;
    cout << "-I-    " << fName << endl;
    cout << "Sts hits: " << nHits << endl;
    cout << "MCTracks: total " << nMCTracks << ", accepted " << nMCacc << ", reconstructable: " << nTracks << endl;
    if (nNoStsHit) cout << "StsHits not found   : " << nNoStsHit << endl;
    if (nNoStsPoint) cout << "StsPoints not found : " << nNoStsPoint << endl;
    if (nNoMCTrack) cout << "MCTracks not found  : " << nNoMCTrack << endl;
    if (nNoTrack) cout << "StsTracks not found : " << nNoTrack << endl;
    cout << "-------------------------------------------------------" << endl;
  }
  else if (success)
    cout << "+ ";
  else
    cout << "- ";
  cout << setw(15) << left << fName << ": " << nMCTracks << ", acc. " << nMCacc << ", rec. " << nTracks << endl;
 
  return nTracks;
}
// -------------------------------------------------------------------------
 
 
ClassImp(CbmStsTrackFinderIdeal)