void anal (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) { gROOT->LoadMacro("loadlibs.C"); loadlibs(); } // 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; Int_t nbytes = 0; Int_t j,hit,ipart; Int_t nhits; Int_t sector,plane; TParticle *particle; AliTPChit *tpcHit; AliTRDhit *trdHit; // Get pointers to Alice detectors and Hits containers AliDetector *TPC = gAlice->GetDetector("TPC"); AliDetector *TRD = gAlice->GetDetector("TRD"); TClonesArray *Particles = gAlice->Particles(); if (TPC) TClonesArray *TPChits = TPC->Hits(); if (TRD) TClonesArray *TRDhits = TRD->Hits(); TTree *TH = gAlice->TreeH(); Int_t ntracks = TH->GetEntries(); // Create histograms TH1F *hSectors = new TH1F("hSectors","Number of tracks hits per sector",75,1,76); TH1F *hTRD = new TH1F("hTRD","Number of planes crossed per track in TRD",6,1,7); TH1F *hTRDprim = new TH1F("hTRDprim","Number of planes crossed per primary track in TRD",6,1,7); // Start loop on tracks in the hits containers for (Int_t track=0; trackResetHits(); nbytes += TH->GetEvent(track); // ======>Histogram TPC // histogram number of tracks per sector if (TPC) { nhits = TPChits->GetEntriesFast(); for (hit=0;hitUncheckedAt(hit); sector = tpcHit->fPadRow; hSectors->Fill(sector); } } // =======>Histogram TRD // histogram number of planes crossed per track // same for primary tracks only if (TRD) { nhits = TRDhits->GetEntriesFast(); for (hit=0;hitUncheckedAt(hit); ipart = trdHit->fTrack; particle = (TParticle*)Particles->UncheckedAt(ipart); plane = trdHit->fX;//Plane; hTRD->Fill(plane); if (particle->GetFirstMother() < 0) hTRDprim->Fill(plane); } } } //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(1,2); c1->cd(1); gPad->SetFillColor(33); hSectors->SetFillColor(42); hSectors->Fit("pol1"); c1->cd(2); gPad->SetFillColor(33); hTRD->SetFillColor(42); hTRD->Draw(); hTRDprim->SetFillColor(46); hTRDprim->Draw("same"); c1->Print("anal.ps"); }