/// \file
/// \ingroup tutorial_eve
/// Demonstrates usage of class TEveStraightLineSet.
///
/// \image html eve_lineset.png
/// \macro_code
///
/// \author Matevz Tadel

TEveStraightLineSet* lineset(Int_t nlines = 40, Int_t nmarkers = 4)
{
   TEveManager::Create();

   TRandom r(0);
   Float_t s = 100;

   auto ls = new TEveStraightLineSet();

   for (Int_t i = 0; i<nlines; i++) {
      ls->AddLine( r.Uniform(-s,s), r.Uniform(-s,s), r.Uniform(-s,s),
                   r.Uniform(-s,s), r.Uniform(-s,s), r.Uniform(-s,s));
      // add random number of markers
      Int_t nm = Int_t(nmarkers* r.Rndm());
      for (Int_t m = 0; m < nm; m++) ls->AddMarker(i, r.Rndm());
   }

   ls->SetMarkerSize(1.5);
   ls->SetMarkerStyle(4);

   gEve->AddElement(ls);
   gEve->Redraw3D();

   return ls;
}

TEveStraightLineSet* lineset_2d(Int_t nlines = 40, Int_t nmarkers = 4)
{
   TEveManager::Create();

   TRandom r(0);
   Float_t s = 100;

   auto ls = new TEveStraightLineSet();

   for (Int_t i = 0; i<nlines; i++) {
      ls->AddLine( r.Uniform(-s,s), r.Uniform(-s,s), 0,
                   r.Uniform(-s,s), r.Uniform(-s,s), 0);
      // add random number of markers
      Int_t nm = Int_t(nmarkers* r.Rndm());
      for (Int_t m = 0; m < nm; m++) ls->AddMarker(i, r.Rndm());
   }

   ls->SetMarkerSize(1.5);
   ls->SetMarkerStyle(4);

   gEve->AddElement(ls);
   gEve->Redraw3D();

   return ls;
}