Logo ROOT   6.12/07
Reference Guide
ProofEvent.C File Reference

Detailed Description

Selector for generic processing with Event.

#define ProofEvent_cxx
#include "ProofEvent.h"
#include "Event.h"
#include <TCanvas.h>
#include <TH1F.h>
#include <TRandom3.h>
//_____________________________________________________________________________
ProofEvent::ProofEvent()
{
// Constructor
fEvent = 0;
fNtrack = -1;
fHisto = 0;
fRandom = 0;
}
//_____________________________________________________________________________
ProofEvent::~ProofEvent()
{
// Destructor
SafeDelete(fRandom);
}
//_____________________________________________________________________________
void ProofEvent::Begin(TTree * /*tree*/)
{
// The Begin() function is called at the start of the query.
// When running with PROOF Begin() is only called on the client.
// The tree argument is deprecated (on PROOF 0 is passed).
TString option = GetOption();
Info("Begin", "starting a simple exercise with process option: %s", option.Data());
}
//_____________________________________________________________________________
void ProofEvent::SlaveBegin(TTree * /*tree*/)
{
// The SlaveBegin() function is called after the Begin() function.
// When running with PROOF SlaveBegin() is called on each slave server.
// The tree argument is deprecated (on PROOF 0 is passed).
TString option = GetOption();
Info("SalveBegin", "starting on a slave with process option: %s", option.Data());
// Create event
fEvent = new Event();
// Create the histogram
fHisto = new TH1F("histo", "tracks multiplicity", 20, 0, 100);
fHisto->GetYaxis()->SetTitle("number of events");
fHisto->GetXaxis()->SetTitle("number of tracks");
//adding histo to selector output list
fOutput->Add(fHisto);
// Set random seed
fRandom = new TRandom3(0);
}
//_____________________________________________________________________________
Bool_t ProofEvent::Process(Long64_t )
{
// Start main loop over all events
// get a random parameter for connstructing event
int i= (int)(100 * (fRandom->Rndm()));
fEvent->Build(i,(1+i), 2);
fNtrack= (fEvent->GetNtrack());
if ((fNtrack >= 0 )&& (fNtrack <= 100 ))
fHisto->Fill(fNtrack, 1);
return kTRUE;
}
//_____________________________________________________________________________
void ProofEvent::SlaveTerminate()
{
//nothing to be done
}
//_____________________________________________________________________________
void ProofEvent::Terminate()
{
// The Terminate() function is the last function to be called during
// a query. It always runs on the client, it can be used to present
// the results graphically or save the results to file.
TCanvas *c1 = new TCanvas("c1","Proof ProofEvent canvas",200,10,700,700);
fHisto = dynamic_cast<TH1F *>(fOutput->FindObject(Form("histo")));
if (fHisto) {
fHisto->Draw("h");
// Final update
c1->cd();
c1->Update();
} else {
Warning("Terminate", "histogram not found");
}
}
Author
Gerardo Ganis (gerar.nosp@m.do.g.nosp@m.anis@.nosp@m.cern.nosp@m..ch)

Definition in file ProofEvent.C.