#include "THStack.h"
#include "TH1F.h"
#include "TCanvas.h"
#include "TPaveStats.h"

int histStack()
{
  THStack *hs = new THStack("hs","test stacked histograms");
  TH1F *h1 = new TH1F("h1","test hstack",100,-4,4);
  h1->FillRandom("gaus",20000);
  h1->SetFillColor(kRed);
  hs->Add(h1);
  TH1F *h2 = new TH1F("h2","test hstack",100,-4,4);
  h2->FillRandom("gaus",15000);
  h2->SetFillColor(kBlue);
  hs->Add(h2);
  TH1F *h3 = new TH1F("h3","test hstack",100,-4,4);
  h3->FillRandom("gaus",10000);
  h3->SetFillColor(kGreen);
  hs->Add(h3);
  TCanvas *c1 = new TCanvas("c1","stacked hists",10,10,700,900);
  c1->Divide (1,2);
  c1->cd(1);
  hs->Draw("nostack");
  c1->cd(2);
  hs->Draw();
  gPad->Update();
  TPaveStats *statbox_stack = (TPaveStats*) hs->GetHistogram()->FindObject("stats");
  statbox_stack->SetY1NDC(0.8);
  statbox_stack->SetY2NDC(0.95);
  gPad->Modified();
  c1->Update();
  return 0;
}