void ellipse()
{
   auto c1 = new TCanvas("c1");
   c1->Range(0, 0, 1, 1);
   auto pel = new TPaveLabel(0.1, 0.8, 0.9, 0.95, "Examples of Ellipses");
   pel->SetFillColor(42);
   pel->Draw();
   auto el1 = new TEllipse(0.25, 0.25, .1, .2);
   el1->Draw();
   auto el2 = new TEllipse(0.25, 0.6, .2, .1);
   el2->SetFillColor(6);
   el2->SetFillStyle(3008);
   el2->Draw();
   auto el3 = new TEllipse(0.75, 0.6, .2, .1, 45, 315);
   el3->SetFillColor(2);
   el3->SetFillStyle(1001);
   el3->SetLineColor(4);
   el3->Draw();
   auto el4 = new TEllipse(0.75, 0.25, .2, .15, 45, 315, 62);
   el4->SetFillColor(5);
   el4->SetFillStyle(1001);
   el4->SetLineColor(4);
   el4->SetLineWidth(6);
   el4->Draw();
}