#define myselector_cxx
// The class definition in myselector.h has been generated automatically
// by the ROOT utility TTree::MakeSelector(). This class is derived
// from the ROOT class TSelector. For more information on the TSelector
// framework see $ROOTSYS/README/README.SELECTOR or the ROOT User Manual.

// The following methods are defined in this file:
//    Begin():        called everytime a loop on the tree starts,
//                    a convenient place to create your histograms.
//    SlaveBegin():   called after Begin(), when on PROOF called only on the
//                    slave servers.
//    Process():      called for each event, in this function you decide what
//                    to read and fill your histograms.
//    SlaveTerminate: called at the end of the loop on the tree, when on PROOF
//                    called only on the slave servers.
//    Terminate():    called at the end of the loop on the tree,
//                    a convenient place to draw/fit your histograms.
//
// To use this file, try the following session on your Tree T:
//
// Root > T->Process("myselector.C")
// Root > T->Process("myselector.C","some options")
// Root > T->Process("myselector.C+")
//

#include "myselector.h"
#include <TH2.h>
#include <TStyle.h>


void myselector::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).
 Init(tree);


   TString option = GetOption();

   fHist=new TH1F("fHist","px",40,0.0,8.0);

}

void myselector::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).

	    Init(tree);

	       TString option = GetOption();

	       }


Bool_t myselector::Process(Int_t entry)
{
   // 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 TTree::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.

   // WARNING when a selector is used with a TChain, you must use
   //  the pointer to the current TTree to call GetEntry(entry).
   //  The entry is always the local entry number in the current tree.
   //  Assuming that fChain is the pointer to the TChain being processed,
   //  use fChain->GetTree()->GetEntry(entry).

 if (ProcessCut(entry)) {
    ProcessFill(entry);
  }

   return kTRUE;
}

void myselector::SlaveTerminate()
{
   // The SlaveTerminate() function is called after all entries or objects
   // have been processed. When running with PROOF SlaveTerminate() is called
   // on each slave server.

}

Bool_t myselector::ProcessCut(Int_t entry)
{
   // Selection function.
   // Entry is the entry number in the current tree.
   // Read only the necessary branches to select entries.
   // Return kFALSE as soon as a bad entry is detected.
   // To read complete event, call fChain->GetTree()->GetEntry(entry).

   return kTRUE;
}

void myselector::ProcessFill(Int_t entry)
{
   // Function called for selected entries only.
   // Entry is the entry number in the current tree.
   // Read branches not processed in ProcessCut() and fill histograms.
   // To read complete event, call fChain->GetTree()->GetEntry(entry).

  fChain->GetTree()->GetEntry(entry);
  fHist->Fill(px);
}




void myselector::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.
  fOutput->Add(fHist);

}