#include "Selector.h"
#include "TCanvas.h"

//_____________________________________________________________________________
Selector::Selector()
{
   // Constructor
   fH1F = 0;
   fRandom = 0;
}
 
//_____________________________________________________________________________
Selector::~Selector()
{
   // Destructor
   if (fRandom) delete fRandom;
}

//_____________________________________________________________________________
void Selector::Initialise()
{
   // 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();
 
   // Histogram
   fH1F = new TH1F("FirstH1F", "First TH1F in PROOF", 100, -10., 10.);
   fOutput->Add(fH1F);
 
   // Random number generator
   fRandom = new TRandom3(0);
}

//_____________________________________________________________________________
void Selector::Loop()
{
   // The Process() function is called for each entry in the tree (or possibly
   // keyed object in the case of PROOF) to be processed. The entry argument
   // specifies which entry in the currently loaded tree is to be processed.
   // It can be passed to either ProofFirst::GetEntry() or TBranch::GetEntry()
   // to read either all or the required parts of the data. When processing
   // keyed objects with PROOF, the object is already loaded and is available
   // via the fObject pointer.
   //
   // This function should contain the "body" of the analysis. It can contain
   // simple or elaborate selection criteria, run algorithms on the data
   // of the event and typically fill histograms.
   //
   // The processing can be stopped by calling Abort().
   //
   // Use fStatus to set the return value of TTree::Process().
   //
   // The return value is currently not used.
 
   if (fRandom && fH1F) {
      Double_t x = fRandom->Gaus(0.,1.);
      fH1F->Fill(x);
   }
}

 //_____________________________________________________________________________
void Selector::Summary()
{
   // 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.
 
   // Create a canvas, with 100 pads
   TCanvas* c1 = new TCanvas("c1", "Proof ProofFirst canvas",200,10,400,400);
   fH1F = dynamic_cast<TH1F *>(fOutput->FindObject("FirstH1F"));
   if (fH1F) fH1F->Draw();
   c1->Update();
}