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