#include <TGraph.h>
#include <TCanvas.h>
#include "TROOT.h"
#include "TRandom3.h"
#include <TStyle.h>
#include <TSystem.h>
#include <TMath.h>


#include <iostream>
#include <fstream>
#include <string>

using namespace std;



void SetNewValues(TGraph* h);

int nr = 8;
int nrPoints = 2048;

int gDisp()
{
gStyle->SetCanvasPreferGL(kTRUE); 
 
TCanvas *c = new TCanvas("c","c",800,400);
TH1F* fHist = c->DrawFrame(0, -2, nrPoints, 2, "TRACKS");
c->Draw();

TGraph** g;
g = new TGraph*[nr];

char name[20];
for(int i = 0; i < nr; i++){
      sprintf(name,"h_%d",i);
      g[i] = new TGraph(nrPoints);
      g[i]->Draw("L");
      g[i]->SetLineColor(i+2);
      c->cd();  
   }
c->Update();


int loop = 0;
while(1){
   for(int i = 0; i < nr; i++){
      SetNewValues( g[i] );
      }
   c->Modified();
   c->Update();
   c->cd();
   if(!(loop%100)) cout << "\r" << loop << flush;
   gSystem->ProcessEvents();
   loop++;
   } 

return 0;
}

void SetNewValues(TGraph* g){

 double freq = gRandom->Rndm()*10;
 for(Int_t i = 0; i < nrPoints; i++){
     g->SetPoint(i, i, gRandom->Rndm()*TMath::Sin(TMath::Pi()*i/(60*freq)));
    }
}