//
ellipses(Int_t ne = 20,Int_t period=30)
{
  //Int_t ne = 50;
  TCanvas* c = new TCanvas("c","",800,800);
  c->SetFillColor(601);
  c->SetTopMargin(0);c->SetLeftMargin(0);c->SetRightMargin(0);c->SetBottomMargin(0);

  c->DrawFrame(0,0,ne,ne,"");
  TEllipse e;
  e.SetNoEdges(1);e.SetLineWidth(2);

  for (int i = 0;i<ne;i++)
    {
      for(int j = 0;j<ne;j++)
	{
	  e.SetFillColor(413);
	  e.SetLineColor(1);
	  e.DrawEllipse(i+.5,j+.5,.5,.25,0,180,i*period+j*period); 
	  e.SetLineColor(0);
	  e.DrawEllipse(i+.5,j+.5,.5,.25,180,360,i*period+j*period); 
	}
    }
}