//Illustrate some basic primitives
//Author: Rene Brun
{
   gROOT->Reset();
   c1 = new TCanvas("c1","ROOT Event description",700,500);
   c1->Range(0,0,14,15.5);
   TPaveText event(1,13,3,15);
   event.SetFillColor(11);
   event.Draw();
   event.AddText("Event");
   TLine line(1.1,13,1.1,1.5);
   line.SetLineWidth(2);
   line.Draw();
   line.DrawLine(1.3,13,1.3,3.5);
   line.DrawLine(1.5,13,1.5,5.5);
   line.DrawLine(1.7,13,1.7,7.5);
   line.DrawLine(1.9,13,1.9,9.5);
   line.DrawLine(2.1,13,2.1,11.5);
   TArrow arrow(1.1,1.5,3.9,1.5,0.02,"|>");
   arrow.SetFillStyle(1001);
   arrow.SetFillColor(1);
   arrow.Draw();
   arrow.DrawArrow(1.3,3.5,3.9,3.5,0.02,"|>");
   arrow.DrawArrow(1.5,5.5,3.9,5.5,0.02,"|>");
   arrow.DrawArrow(1.7,7.5,3.9,7.5,0.02,"|>");
   arrow.DrawArrow(1.9,9.5,3.9,9.5,0.02,"|>");
   arrow.DrawArrow(2.1,11.5,3.9,11.5,0.02,"|>");
   TPaveText p1(4,1,11,2);
   p1.SetTextAlign(12);
   p1.SetFillColor(42);
   p1.AddText("1 Mbyte");
   p1.Draw();
   TPaveText p2(4,3,10,4);
   p2.SetTextAlign(12);
   p2.SetFillColor(42);
   p2.AddText("100 Kbytes");
   p2.Draw();
   TPaveText p3(4,5,9,6);
   p3.SetTextAlign(12);
   p3.SetFillColor(42);
   p3.AddText("10 Kbytes");
   p3.Draw();
   TPaveText p4(4,7,8,8);
   p4.SetTextAlign(12);
   p4.SetFillColor(42);
   p4.AddText("1 Kbytes");
   p4.Draw();
   TPaveText p5(4,9,7,10);
   p5.SetTextAlign(12);
   p5.SetFillColor(42);
   p5.AddText("100 bytes");
   p5.Draw();
   TPaveText p6(4,11,6,12);
   p6.SetTextAlign(12);
   p6.SetFillColor(42);
   p6.AddText("10 bytes");
   p6.Draw();
   TText text;
   text.SetTextAlign(12);
   text.SetTextSize(0.04);
   text.SetTextFont(72);
   text.DrawText(6.2,11.5,"Header:Event_flag");
   text.DrawText(7.2,9.5,"Trigger_Info");
   text.DrawText(8.2,7.5,"Muon_Detector: TOF");
   text.DrawText(9.2,5.5,"Calorimeters");
   text.DrawText(10.2,3.5,"Forward_Detectors");
   text.DrawText(11.2,1.5,"TPCs");
}