// This file is part of the ACTS project.

//

// Copyright (C) 2016 CERN for the benefit of the ACTS project

//

// This Source Code Form is subject to the terms of the Mozilla Public

// License, v. 2.0. If a copy of the MPL was not distributed with this

// file, You can obtain one at https://mozilla.org/MPL/2.0/.

#include "TFile.h"

#include "TH1F.h"

#include "TROOT.h"

#include "TTree.h"

/// This root script reads in two histograms with the names 'hist1Name' and

/// 'hist2Name' from the root file 'inFile' and draws them normalized with

/// different colors in one Canvas

void

compareDistributions(std::string inFile1,

std::string hist1Name,

int col1,

std::string inFile2,

std::string hist2Name,

int col2)

{

std::cout << "Opening file: " << inFile1 << std::endl;

TFile inputFile1(inFile1.c_str());

std::cout << "Opening file: " << inFile2 << std::endl;

TFile inputFile2(inFile2.c_str());

std::cout << "Comparing Histograms: " << hist1Name << " & " << hist2Name

<< std::endl;

TH1F* h1 = (TH1F*)inputFile1.Get(hist1Name.c_str());

TH1F* h2 = (TH1F*)inputFile2.Get(hist2Name.c_str());

h1->SetLineColor(col1);

h1->DrawNormalized();

h2->SetLineColor(col2);

h2->DrawNormalized("same");

TLegend* leg = new TLegend(0.72, 0.71, 0.99, 0.95);

leg->AddEntry(h1, hist1Name.c_str());

leg->AddEntry(h2, hist2Name.c_str());

leg->Draw();

h1->SetDirectory(0);

h2->SetDirectory(0);

inputFile1.Close();

inputFile2.Close();

}