/// \file
/// \ingroup tutorial_eve
/// Demonstates 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.ch/files/alice_ESDgeometry.root";
void projection()
{
TFile::SetCacheFileDir(".");
TEveManager::Create();
// camera
TEveScene* s = gEve->SpawnNewScene("Projected Event");
gEve->GetDefaultViewer()->AddScene(s);
TGLViewer* v = gEve->GetDefaultGLViewer();
v->SetCurrentCamera(TGLViewer::kCameraOrthoXOY);
TGLOrthoCamera& cam = (TGLOrthoCamera&) v->CurrentCamera();
cam.SetZoomMinMax(0.2, 20);
// projections
TEveProjectionManager* mng =
new TEveProjectionManager(TEveProjection::kPT_RPhi);
s->AddElement(mng);
TEveProjectionAxes* axes = new TEveProjectionAxes(mng);
axes->SetTitle("TEveProjections demo");
s->AddElement(axes);
gEve->AddToListTree(axes, kTRUE);
gEve->AddToListTree(mng, kTRUE);
// Simple geometry
TFile* geom = TFile::Open(esd_geom_file_name, "CACHEREAD");
if (!geom)
return;
TEveGeoShapeExtract* gse = (TEveGeoShapeExtract*) geom->Get("Gentle");
TEveGeoShape* gsre = TEveGeoShape::ImportShapeExtract(gse, 0);
geom->Close();
delete geom;
gsre->SetPickableRecursively(kTRUE);
gEve->AddGlobalElement(gsre);
gEve->GetGlobalScene()->SetRnrState(kFALSE);
mng->ImportElements(gsre);
TEveLine* 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);
}