ITS/AliITSFindClustersV2.C

   1 #ifndef __CINT__
   2   #include <iostream.h>
   3
   4   #include "AliRun.h"
   5   #include "AliITS.h"
   6   #include "AliITSgeom.h"
   7   #include "AliITSRecPoint.h"
   8   #include "AliITSclusterV2.h"
   9   #include "AliITSsimulationFastPoints.h"
  10
  11   #include "TFile.h"
  12   #include "TTree.h"
  13   #include "TParticle.h"
  14 #endif
  15
  16 Int_t AliITSFindClustersV2() {
  17 /****************************************************************
  18  *  Just something to start with                                *
  19  ****************************************************************/
  20    cerr<<"Looking for clusters...\n";
  21
  22    if (gAlice) {delete gAlice; gAlice=0;}
  23
  24    TFile *in=TFile::Open("galice.root","update");
  25    if (!in->IsOpen()) {
  26       cerr<<"Can't open galice.root !\n";
  27       return 1;
  28    }
  29
  30    if (!(gAlice=(AliRun*)in->Get("gAlice"))) {
  31       cerr<<"Can't find gAlice !\n";
  32       return 2;
  33    }
  34
  35    Int_t ev=0;
  36    gAlice->GetEvent(ev);
  37
  38    AliITS *ITS  = (AliITS*)gAlice->GetModule("ITS");
  39    if (!ITS) {
  40       cerr<<"Can't find the ITS !\n";
  41       return 3;
  42    }
  43
  44    gAlice->MakeTree("R"); ITS->MakeBranch("R",0);
  45 //////////////// Taken from ITSHitsToFastPoints.C ///////////////////////
  46    ITS->SetSimulationModel(0,new AliITSsimulationFastPoints());
  47    ITS->SetSimulationModel(1,new AliITSsimulationFastPoints());
  48    ITS->SetSimulationModel(2,new AliITSsimulationFastPoints());
  49    Int_t nsignal=25;
  50    Int_t size=-1;
  51    Int_t bgr_ev=Int_t(ev/nsignal);
  52    ITS->HitsToFastRecPoints(ev,bgr_ev,size," ","All"," ");
  53 //////////////////////////////////////////////////////////////////////////
  54
  55    delete gAlice; gAlice=0;
  56    in->Close();
  57
  58 ///////////////// Conversion AliITSRecPoint -> AliITSclusterV2 //////////////
  59    /*TFile */in=TFile::Open("galice.root");
  60
  61    if (gAlice) {delete gAlice; gAlice=0;}
  62
  63    if (!(gAlice=(AliRun*)in->Get("gAlice"))) {
  64       cerr<<"Can't find gAlice !\n";
  65       return 4;
  66    }
  67
  68    gAlice->GetEvent(0);
  69
  70    /*AliITS */ITS  = (AliITS*)gAlice->GetModule("ITS");
  71    if (!ITS) {
  72       cerr<<"Can't find the ITS !\n";
  73       return 5;
  74    }
  75    AliITSgeom *geom=ITS->GetITSgeom();
  76
  77    TFile *out=TFile::Open("AliITSclustersV2.root","new");
  78    if (!out->IsOpen()) {
  79       cerr<<"Delete old AliITSclustersV2.root !\n";
  80       return 6;
  81    }
  82    geom->Write();
  83
  84    TClonesArray *clusters=new TClonesArray("AliITSclusterV2",10000);
  85    //TTree *cTree=new TTree("cTree","ITS clusters");
  86    TTree *cTree=new TTree("TreeC_ITS_0","ITS clusters");
  87    cTree->Branch("Clusters",&clusters);
  88
  89    TTree *pTree=gAlice->TreeR();
  90    if (!pTree) {
  91       cerr<<"Can't get TreeR !\n";
  92       return 7;
  93    }
  94    TBranch *branch=pTree->GetBranch("ITSRecPoints");
  95    if (!branch) {
  96       cerr<<"Can't get ITSRecPoints branch !\n";
  97       return 8;
  98    }
  99    TClonesArray *points=new TClonesArray("AliITSRecPoint",10000);
 100    branch->SetAddress(&points);
 101
 102    TClonesArray &cl=*clusters;
 103    Int_t nclusters=0;
 104    Int_t nentr=(Int_t)pTree->GetEntries();
 105
 106    cerr<<"Number of entries: "<<nentr<<endl;
 107
 108    for (Int_t i=0; i<nentr; i++) {
 109        points->Clear();
 110        pTree->GetEvent(i);
 111        Int_t ncl=points->GetEntriesFast(); if (ncl==0){cTree->Fill();continue;}
 112        Int_t lay,lad,det; geom->GetModuleId(i,lay,lad,det);
 113        Float_t x,y,zshift; geom->GetTrans(lay,lad,det,x,y,zshift);
 114        Double_t rot[9];    geom->GetRotMatrix(lay,lad,det,rot);
 115        Double_t yshift = x*rot[0] + y*rot[1];
 116        Int_t ndet=(lad-1)*geom->GetNdetectors(lay) + (det-1);
 117        nclusters+=ncl;
 118        for (Int_t j=0; j<ncl; j++) {
 119           AliITSRecPoint *p=(AliITSRecPoint*)points->UncheckedAt(j);
 120           Float_t lp[5];
 121           lp[0]=-p->GetX()-yshift; if (lay==1) lp[0]=-lp[0];
 122           lp[1]=p->GetZ()+zshift;
 123           lp[2]=p->GetSigmaX2();
 124           lp[3]=p->GetSigmaZ2();
 125           lp[4]=p->GetQ();
 126           Int_t lab[6];
 127           lab[0]=p->GetLabel(0);lab[1]=p->GetLabel(1);lab[2]=p->GetLabel(2);
 128           lab[3]=ndet;
 129
 130           Int_t label=lab[0];
 131           TParticle *part=(TParticle*)gAlice->Particle(label);
 132           label=-3;
 133           while (part->P() < 0.005) {
 134              Int_t m=part->GetFirstMother();
 135              if (m<0) {cerr<<"Primary momentum: "<<part->P()<<endl; break;}
 136              label=m;
 137              part=(TParticle*)gAlice->Particle(label);
 138           }
 139           if      (lab[1]<0) lab[1]=label;
 140           else if (lab[2]<0) lab[2]=label;
 141           else cerr<<"No empty labels !\n";
 142
 143           new(cl[j]) AliITSclusterV2(lab,lp);
 144        }
 145        cTree->Fill(); clusters->Delete();
 146        points->Delete();
 147    }
 148    cTree->Write();
 149
 150    cerr<<"Number of clusters: "<<nclusters<<endl;
 151
 152    delete cTree; delete clusters; delete points;
 153
 154    delete gAlice; gAlice=0;
 155
 156    in->Close();
 157    out->Close();
 158
 159    return 0;
 160
 161 }
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