compound.C

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/// \file
/// \ingroup tutorial_eve
/// Demonstrates usage of EVE compound objects - class TEveCompound.
///
/// \image html eve_compound.png
/// \macro_code
///
/// \author Matevz Tadel
 
TEveLine *random_line(TRandom &rnd, Int_t n, Float_t delta)
{
   auto line = new TEveLine;
   line->SetMainColor(kGreen);
 
   Float_t x = 0, y = 0, z = 0;
   for (Int_t i = 0; i < n; ++i) {
      line->SetNextPoint(x, y, z);
      x += rnd.Uniform(0, delta);
      y += rnd.Uniform(0, delta);
      z += rnd.Uniform(0, delta);
   }
 
   return line;
}
 
void compound()
{
   TEveManager::Create();
 
   auto ml = new TEveLine;
   ml->SetMainColor(kRed);
   ml->SetLineStyle(kDashed);
   ml->SetLineWidth(3);
   gEve->InsertVizDBEntry("BigLine", ml);
 
   auto cmp = new TEveCompound;
   cmp->SetMainColor(kGreen);
   gEve->AddElement(cmp);
 
   TRandom rnd(0);
 
   cmp->OpenCompound();
 
   cmp->AddElement(random_line(rnd, 20, 10));
   cmp->AddElement(random_line(rnd, 20, 10));
 
   auto line = random_line(rnd, 20, 12);
   line->ApplyVizTag("BigLine");
   cmp->AddElement(line);
 
   cmp->CloseCompound();
 
   // Projected view
   auto viewer = gEve->SpawnNewViewer("Projected");
   auto scene = gEve->SpawnNewScene("Projected Event");
   viewer->AddScene(scene);
   {
      auto v = viewer->GetGLViewer();
      v->SetCurrentCamera(TGLViewer::kCameraOrthoXOY);
   }
 
   // projections
   auto mng = new TEveProjectionManager(TEveProjection::kPT_RPhi);
   scene->AddElement(mng);
   auto axes = new TEveProjectionAxes(mng);
   scene->AddElement(axes);
   gEve->AddToListTree(axes, kTRUE);
   gEve->AddToListTree(mng, kTRUE);
 
   mng->ImportElements(cmp);
 
   gEve->Redraw3D(kTRUE);
}