New version with the Bari/Salerno model as default for SPD simulation

[u/mrichter/AliRoot.git] / ITS / AliITSFindClustersV2.C

#ifndef __CINT__
  #include "AliRun.h"
  #include "AliITS.h"
  #include "AliITSgeom.h"
  #include "AliITSRecPoint.h"
  #include "AliITSclusterV2.h"
  #include "AliITSsimulationFastPoints.h"

  #include "TFile.h"
  #include "TTree.h"
  #include "TParticle.h"
#endif

Int_t AliITSFindClustersV2() {
/****************************************************************
 *  Just something to start with                                *
 ****************************************************************/
   cerr<<"Looking for clusters...\n";

   if (gAlice) {delete gAlice; gAlice=0;}

   TFile *in=TFile::Open("galice.root","update");
   if (!in->IsOpen()) {
      cerr<<"Can't open galice.root !\n"; 
      return 1;
   }
   
   if (!(gAlice=(AliRun*)in->Get("gAlice"))) {
      cerr<<"Can't find gAlice !\n";
      return 2;
   }

   Int_t ev=0;
   gAlice->GetEvent(ev);

   AliITS *ITS  = (AliITS*)gAlice->GetModule("ITS");
   if (!ITS) {
      cerr<<"Can't find the ITS !\n";
      return 3;
   }

   gAlice->MakeTree("R"); ITS->MakeBranch("R",0);
//////////////// Taken from ITSHitsToFastPoints.C ///////////////////////
   AliITSsimulationFastPoints *sim = new AliITSsimulationFastPoints();
   for (Int_t i=0;i<3;i++) { ITS->SetSimulationModel(i,sim); }

   Int_t nsignal=25;
   Int_t size=-1;
   Int_t bgr_ev=Int_t(ev/nsignal);
   ITS->HitsToFastRecPoints(ev,bgr_ev,size," ","All"," ");
//////////////////////////////////////////////////////////////////////////
   delete gAlice; gAlice=0;
   in->Close();

///////////////// Conversion AliITSRecPoint -> AliITSclusterV2 //////////////
   /*TFile */in=TFile::Open("galice.root");

   if (gAlice) {delete gAlice; gAlice=0;}

   if (!(gAlice=(AliRun*)in->Get("gAlice"))) {
      cerr<<"Can't find gAlice !\n";
      return 4;
   }

   gAlice->GetEvent(0);

   /*AliITS */ITS  = (AliITS*)gAlice->GetModule("ITS");
   if (!ITS) {
      cerr<<"Can't find the ITS !\n";
      return 5;
   }
   AliITSgeom *geom=ITS->GetITSgeom();
 
   TFile *out=TFile::Open("AliITSclustersV2.root","new");
   if (!out->IsOpen()) {
      cerr<<"Delete old AliITSclustersV2.root !\n"; 
      return 6;
   }
   geom->Write();

   TClonesArray *clusters=new TClonesArray("AliITSclusterV2",10000);
   TTree *cTree=new TTree("cTree","ITS clusters");
   cTree->Branch("Clusters",&clusters);

   TTree *pTree=gAlice->TreeR();
   if (!pTree) { 
      cerr<<"Can't get TreeR !\n";
      return 7;
   }
   TBranch *branch=pTree->GetBranch("ITSRecPoints");
   if (!branch) { 
      cerr<<"Can't get ITSRecPoints branch !\n";
      return 8;
   }
   TClonesArray *points=new TClonesArray("AliITSRecPoint",10000);
   branch->SetAddress(&points);

   TClonesArray &cl=*clusters;
   Int_t nclusters=0;
   Int_t nentr=(Int_t)pTree->GetEntries();

   cerr<<"Number of entries: "<<nentr<<endl;

   for (Int_t i=0; i<nentr; i++) {
       if (!pTree->GetEvent(i)) {cTree->Fill(); continue;}
       Int_t lay,lad,det; geom->GetModuleId(i,lay,lad,det);
       Float_t x,y,zshift; geom->GetTrans(lay,lad,det,x,y,zshift); 
       Double_t rot[9];    geom->GetRotMatrix(lay,lad,det,rot);
       Double_t yshift = x*rot[0] + y*rot[1];
       Int_t ndet=(lad-1)*geom->GetNdetectors(lay) + (det-1);
       Int_t ncl=points->GetEntriesFast();
       nclusters+=ncl;
       for (Int_t j=0; j<ncl; j++) {
          AliITSRecPoint *p=(AliITSRecPoint*)points->UncheckedAt(j);
          Float_t lp[5];
          lp[0]=-p->GetX()-yshift; if (lay==1) lp[0]=-lp[0];
          lp[1]=p->GetZ()+zshift;
          lp[2]=p->GetSigmaX2();
          lp[3]=p->GetSigmaZ2();
          lp[4]=p->GetQ();
          Int_t lab[6]; 
          lab[0]=p->GetLabel(0);lab[1]=p->GetLabel(1);lab[2]=p->GetLabel(2);
          lab[3]=ndet;

          Int_t label=lab[0];
          TParticle *part=(TParticle*)gAlice->Particle(label);
          label=-3;
          while (part->P() < 0.005) {
             Int_t m=part->GetFirstMother();
             if (m<0) {cerr<<"Primary momentum: "<<part->P()<<endl; break;}
             label=m;
             part=(TParticle*)gAlice->Particle(label);
          }
          if      (lab[1]<0) lab[1]=label;
          else if (lab[2]<0) lab[2]=label;
          else cerr<<"No empty labels !\n";

          new(cl[j]) AliITSclusterV2(lab,lp);
       }
       cTree->Fill(); clusters->Delete();
       points->Delete();
   }
   cTree->Write();

   cerr<<"Number of clusters: "<<nclusters<<endl;

   delete cTree; delete clusters; delete points;

   delete gAlice; gAlice=0;
   in->Close();
   out->Close();

   return 0;
}