void analITS (Int_t evNumber=0) { ///////////////////////////////////////////////////////////////////////// // This macro is a small example of a ROOT macro // illustrating how to read the output of GALICE // and fill some histograms. // // Root > .L anal.C //this loads the macro in memory // Root > anal(); //by default process first event // Root > anal(2); //process third event //Begin_Html /* */ //End_Html ///////////////////////////////////////////////////////////////////////// // Dynamically link some shared libs if (gClassTable->GetID("AliRun") < 0) { gSystem->Load("libGeant3Dummy.so"); // a dummy version of Geant3 gSystem->Load("PHOS/libPHOSdummy.so"); // the standard Alice classes gSystem->Load("libgalice.so"); // the standard Alice classes } // Connect the Root Galice file containing Geometry, Kine and Hits TFile *file = (TFile*)gROOT->GetListOfFiles()->FindObject("galice.root"); if (!file) file = new TFile("galice.root"); // Get AliRun object from file or create it if not on file if (!gAlice) { gAlice = (AliRun*)file->Get("gAlice"); if (gAlice) printf("AliRun object found on file\n"); if (!gAlice) gAlice = new AliRun("gAlice","Alice test program"); } // Import the Kine and Hits Trees for the event evNumber in the file Int_t nparticles = gAlice->GetEvent(evNumber); if (nparticles <= 0) return; Float_t x,y,z,mass,e,r; Int_t nbytes = 0; Int_t j,hit,ipart; Int_t nhits; Int_t sector,plane; GParticle *particle; AliTPChit *tpcHit; AliITShit *itsHit; // Get pointers to Alice detectors and Hits containers AliDetector *TPC = gAlice->GetDetector("TPC"); AliDetector *ITS = gAlice->GetDetector("ITS"); TClonesArray *Particles = gAlice->Particles(); if (TPC) TClonesArray *TPChits = TPC->Hits(); if (ITS) TClonesArray *ITShits = ITS->Hits(); TTree *TH = gAlice->TreeH(); Int_t ntracks = TH->GetEntries(); // Create histograms TH1F *hITSZ = new TH1F("hITSZ","Z of hits in ITS",100,-50.,50.); TH1F *hITSR = new TH1F("hITSR","R of hits in ITS",100,0.,50.); TH1F *hITSDnum = new TH1F("hITSDnum","JLAY of hits in ITS",20, 0., 20.); TH1F *hITSTr = new TH1F("hITSTr","Track number for hits in ITS",100,0.,50000.); // Start loop on tracks in the hits containers for (Int_t track=0; trackResetHits(); nbytes += TH->GetEvent(track); Int_t i=0; if (ITS) { nhits = ITShits->GetEntriesFast(); for (hit=0;hitUncheckedAt(hit); ipart = itsHit->fTrack; particle = (GParticle*)Particles->UncheckedAt(ipart); z = itsHit->fZ; hITSZ->Fill(z); r = sqrt(itsHit->fX*itsHit->fX + itsHit->fY*itsHit->fY); hITSR->Fill(r); hITSDnum->Fill(itsHit->fDnum); hITSTr->Fill(itsHit->fTrack); i++; } } } //Create a canvas, set the view range, show histograms TCanvas *c1 = new TCanvas("c1","Alice TPC and ITS hits",400,10,600,700); c1->Divide(2,2); c1->cd(1); gPad->SetFillColor(33); hITSZ->SetFillColor(33); hITSZ->Draw(); c1->cd(2); gPad->SetFillColor(33); hITSR->SetFillColor(46); hITSR->Draw(); c1->cd(3); gPad->SetFillColor(33); hITSDnum->SetFillColor(46); hITSDnum->Draw(); c1->cd(4); gPad->SetFillColor(33); hITSTr->SetFillColor(46); hITSTr->Draw(); c1->Print("analITS.ps"); }