#include <iostream.h>

//Purpose: Simple example of how to make plots from file made by TElecand.cc 
//
//User can specify file name as an argument .x ele_example.C("myfile.hbk")
//
void ele_example(Char_t* filename="ele_cand.root"){
  
  //Set up the style
  gROOT->SetStyle("Plain");
  gStyle->SetTitleFont(32);  	//Title box font (32=italic times bold)
  gStyle->SetTitleX(0.1);		//Title box x position (top left-hand corner)	
  gStyle->SetTitleY(0.995); 	//Title box y position (default value)		
  gStyle->SetTitleW(0.6);		//Title box width as fraction of pad size
  gStyle->SetTitleH(0.08);	//Title box height as fraction of pad size	

  //Open the file
  TFile* f=new TFile(filename);
  f->ls();
  
  //Open a canvas
  TCanvas* myc = new TCanvas("Electrons","Example plot: default/tight/loose/stacked",400,500);
  myc->Clear();
  myc->Divide(2,2); 

  //Draw ET histograms for default, tight and loose electrons

  myc->cd(1);//draw stntuple default 
  f->cd("ElectronBlock/default");
  ncem_Et->Draw();
  
  myc->cd(2);//draw tight 
  f->cd("ElectronBlock/tight");
  ncem_Et->Draw();

  myc->cd(3);//draw loose
  f->cd("ElectronBlock/loose");
  ncem_Et->Draw();

  myc->cd(4);//stack them - have to add tight and loose together and store in "both"
  f->cd("ElectronBlock/default");
  ncem_Et->Draw();
  
  f->cd("ElectronBlock/loose");
  TH1F* both = (TH1F*) ncem_Et->Clone();
  both->SetName("both");

  f->cd("ElectronBlock/tight");
  both->Add(ncem_Et);
  both->SetFillColor(4);
  both->SetFillStyle(3004);
  both->Draw("same");

  ncem_Et->SetFillColor(4);
  ncem_Et->Draw("same");

  //Add a legend
  leg =new TLegend(0.65,0.75,0.75,0.85,"");
  leg->SetFillColor(0);
  f->cd("ElectronBlock/default");
  leg->AddEntry(ncem_Et,"Default");
  leg->AddEntry(both,"Loose","F");
  f->cd("ElectronBlock/tight");
  leg->AddEntry(ncem_Et,"Tight","F");
  leg->Draw();


  return;
}