#include <unistd.h>
#include "TColor.h"
#include "TObjArray.h"
#include "TH2D.h"
#include "TCanvas.h"
#include "TApplication.h"
#include "TROOT.h"
#include "TPolyLine.h"
#include "TImage.h"
#include "TStyle.h"
#include "TRandom.h"

int main()
{
  TApplication app("App", 0, 0);
  
  gROOT->SetBatch(1);

  TObjArray array;
  TCanvas* can;
  TImage* img;
  
  TRandom rand;

  daemon(0, 0);

  while(1){
    can = new TCanvas("can", "", 644, 508);
    array.Add(can);

    img = TImage::Open("tmp.png");
    array.Add(img);
    if(img->IsValid()){
      img->Draw();
    } // if

    can->cd();

    for(int i=0; i<100; i++){
      double x[5], y[5];
      for(int j=0; j<4; j++){
	x[j] = rand.Uniform(-0.1, 1.1);
	y[j] = rand.Uniform(-0.1, 1.1);
      } // j
      x[4] = x[0];
      y[4] = y[0];

      TPolyLine* pol = new TPolyLine(5, x, y);
      array.Add(pol);
      pol->SetFillColor(100 + i);
      pol->SetLineWidth(0);
      pol->Draw("f");
    } // i

    can->SaveAs("tmp.png");
    
    array.Delete();
  } // while
}