#include "TStyle.h"
#include "TTimer.h"
#include "Riostream.h"
#include "TCanvas.h"
#include "TGraph.h"
#include "TROOT.h"
#include "TGraphErrors.h"
#include "TFrame.h"
#include "TAxis.h"



void grapherrors(){
  //
  gStyle->SetOptStat(10);
  gStyle->SetOptFit(111);
  gStyle->SetFrameBorderMode(0);
  gStyle->SetCanvasBorderMode(0);
  gStyle->SetPadBorderMode(0);
  gStyle->SetFrameFillColor(10);
  gStyle->SetPadColor(10);
  gStyle->SetCanvasColor(10);
  gStyle->SetTitleColor(10);
  gStyle->SetStatColor(10);
  gStyle->SetFillColor(10);
  gROOT->Reset();
 
  TCanvas * c1 = new TCanvas("c1","A Simple Graph",200,10,700,500);
  
  c1->SetFillColor(42);
  c1->SetGrid();
 
  const Int_t n = 4;
  Float_t x[n]  = {-0.22, 0.05, 0.25, 0.35};
  Float_t y[n]  = {1.,2.9,5.6,7.4};
  Float_t ex[n] = {.5,.1,.07,.07};
  Float_t ey[n] = {.8,.7,.6,.5};
  
  c1->cd();

  TGraph * gr1 = new TGraph(n,x,y);
  gr1->SetTitle("TGraph");
  gr1->SetMarkerColor(4);
  gr1->SetMarkerStyle(21);
  gr1->GetXaxis()->SetTitle("x"); //Add a title to the axis
  gr1->GetYaxis()->SetTitle("y");
  gr1->Draw("ALP");

  TCanvas * c2 = new TCanvas("c2","A Simple Graph with error bars",910,10,700,500);
  c2->cd();
  c2->SetFillColor(8);
  c2->SetGrid();
  c2->GetFrame()->SetFillColor(21);
  c2->GetFrame()->SetBorderSize(12);
  
  
  TGraph * gr2 = new TGraphErrors(n,x,y,ex,ey);
  gr2->SetTitle("TGraphErrors Example");
  gr2->SetMarkerColor(4);
  gr2->SetMarkerStyle(21);
  gr2->Draw("ALP");
  
  return;
}