#include <fstream>
#include <iostream>
#include <string>
#include "TCanvas.h"
#include "TH1.h"
#include "TF1.h"
#include "TFile.h"
#include "TGraph.h"
#include "TGaxis.h"
#include "TPad.h"
#include "TKey.h"

void draw(){
      
    TFile *f = new TFile("temperatures.root");
    f->GetListOfKeys()->Sort();
    //f->GetListOfKeys()->Print();
    int numofgraphs = 0;
    int numofkeys = f->GetListOfKeys()->GetSize();
    std::cout<<"Number of keys: "<<numofkeys<<std::endl;  
    TGraph** graphs = new TGraph*[numofkeys];

    for(int i=0;i<numofkeys;i++){
        std::string histoname(f->GetListOfKeys()->At(i)->GetName());
        if (histoname.rfind("Room", 0) == 0 || histoname.rfind("Crystal", 0) == 0){
            std::cout << histoname << std::endl;
            graphs[numofgraphs] = (TGraph*) ((TKey*)f->GetListOfKeys()->At(i))->ReadObj();
            numofgraphs++;
        }
    }
    std::cout << numofgraphs << std::endl;
  
    TCanvas *canvas = new TCanvas("Temperature","Temperature correlation",2000,1000);

    canvas->cd(1);
    graphs[0]->GetYaxis()->SetRangeUser(-200,40);
    graphs[0]->Draw("AL");
    graphs[1]->SetLineColor(4);
    graphs[1]->Draw("L");
}