projection.C

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/// \file
/// \ingroup tutorial_eve
/// Demonstrates usage of automatic 2D projections - class TEveProjectionManager.
///
/// \image html eve_projection.png
/// \macro_code
///
/// \author Matevz Tadel
 
const char *esd_geom_file_name = "http://root.cern/files/alice_ESDgeometry.root";
 
void projection()
{
   TFile::SetCacheFileDir(".");
   TEveManager::Create();
 
   // camera
   auto s = gEve->SpawnNewScene("Projected Event");
   gEve->GetDefaultViewer()->AddScene(s);
   auto v = gEve->GetDefaultGLViewer();
   v->SetCurrentCamera(TGLViewer::kCameraOrthoXOY);
   TGLOrthoCamera &cam = (TGLOrthoCamera &)v->CurrentCamera();
   cam.SetZoomMinMax(0.2, 20);
 
   // projections
   auto mng = new TEveProjectionManager(TEveProjection::kPT_RPhi);
   s->AddElement(mng);
   auto axes = new TEveProjectionAxes(mng);
   axes->SetTitle("TEveProjections demo");
   s->AddElement(axes);
   gEve->AddToListTree(axes, kTRUE);
   gEve->AddToListTree(mng, kTRUE);
 
   // Simple geometry
   auto geom = TFile::Open(esd_geom_file_name, "CACHEREAD");
   if (!geom)
      return;
 
   auto gse = (TEveGeoShapeExtract *)geom->Get("Gentle");
   auto gsre = TEveGeoShape::ImportShapeExtract(gse, 0);
   geom->Close();
   delete geom;
   gsre->SetPickableRecursively(kTRUE);
   gEve->AddGlobalElement(gsre);
   gEve->GetGlobalScene()->SetRnrState(kFALSE);
   mng->ImportElements(gsre);
 
   auto line = new TEveLine;
   line->SetMainColor(kGreen);
   for (Int_t i = 0; i < 160; ++i)
      line->SetNextPoint(120 * sin(0.2 * i), 120 * cos(0.2 * i), 80 - i);
   gEve->AddElement(line);
   mng->ImportElements(line);
   line->SetRnrSelf(kFALSE);
 
   gEve->Redraw3D(kTRUE);
}