ITS/AliITSFindClustersV2.C

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