text_test.C: Demonstrates usage of class TEveText - 2D & 3D text in GL.

// @(#)root/eve:$Id: text_test.C 26876 2008-12-12 14:45:40Z matevz $
// Author: Alja Mrak-Tadel

// Demonstrates usage of class TEveText - 2D & 3D text in GL.


TEveText* text_test()
{
   gSystem->IgnoreSignal(kSigSegmentationViolation, true);

   TEveManager::Create();

   TEvePointSet* marker = new TEvePointSet(8);
   marker->SetName("Origin marker");
   marker->SetMarkerColor(6);
   marker->SetMarkerStyle(3);
   Float_t a = 10;
   marker->SetPoint(0, a,  +a, +a);
   marker->SetPoint(1, a,  -a, +a);
   marker->SetPoint(2, -a, -a, +a);
   marker->SetPoint(3, -a, +a, +a);
   marker->SetPoint(4, +a, +a, -a);
   marker->SetPoint(5, +a, -a, -a);
   marker->SetPoint(6, -a, +a, -a);
   marker->SetPoint(7, -a, -a, -a);
   gEve->AddElement(marker);

   TEveText* t = new TEveText("DADA");
   t->PtrMainTrans()->RotateLF(1, 3, TMath::PiOver2());
   t->SetMainColor(kOrange-2);
   t->SetFontSize(64);
   t->SetFontMode(TGLFont::kExtrude);
   t->SetLighting(kTRUE);
   gEve->AddElement(t);

   // TEveText does not know its bounding box before first rendering.
   gEve->FullRedraw3D(kTRUE);
   gEve->GetDefaultGLViewer()->ResetCurrentCamera();
   gEve->GetDefaultGLViewer()->RequestDraw(TGLRnrCtx::kLODHigh);

   return t;
}