#include <time.h>

void macro_ex() {
 


 TCanvas *c1 = new TCanvas("c1","A Simple Graph Example",200,10,700,500);

   c1->SetFillColor(42);
   c1->SetGrid();
    
   const Int_t max = 10;
   
  
   Double_t x[max];
   Double_t y[max];
  
   Double_t c=0;
   x[0]=0;
   y[0]=0;
   stringstream temp;
   string datetime;
   const char *p;
   
   gr = new TGraph(1,x, y);
   gr->SetMarkerStyle(21);
   gr->SetTitle("Time graph");
   gr->GetXaxis()->SetTitle("X title");
   gr->GetYaxis()->SetTitle("Y title");
   c1->Update();
   c1->Clear();
   Int_t i =0;
   while(1){

    	        t = time(0);
		timeinfo = localtime ( &t );
		
		
		temp << timeinfo->tm_hour << ":" << timeinfo->tm_min <<":" << timeinfo-> tm_sec;
     		datetime = temp.str();
 
		p = datetime.c_str();
	
		x[i] = t;
		
	        if (i==max){
	          i=0;
		  gr->Set(i);
		  }
		
		if (i%2 == 0)  // only to draw triangles
		  y[i] = 2000;
		else
	          y[i] = 2;
     		
		gr->SetPoint(i,x[i],y[i]);
                gr->GetXaxis()->SetBinLabel(i,p);
     	 	gr->Draw("AL");
     	 	c1->Update();
     		gSystem->Sleep(1000);
                i= i+1;
		
		
   }
 
}