boxset_cones.C

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/// \file
/// \ingroup tutorial_eve
/// Demonstrates usage of 'cone' mode in TEveBoxSet class.
///
/// \image html eve_boxset_cones.png
/// \macro_code
///
/// \author Alja Mrak-Tadel
 
TEveBoxSet *boxset_cones(Float_t x = 0, Float_t y = 0, Float_t z = 0, Int_t num = 100, Bool_t register = kTRUE)
{
   TEveManager::Create();
 
   using namespace TMath;
 
   auto lines = new TEveStraightLineSet("StraightLines");
   lines->SetLineColor(kYellow);
   lines->SetLineWidth(2);
 
   TRandom r(0);
   auto pal = new TEveRGBAPalette(0, 500);
   auto cones = new TEveBoxSet("ConeSet");
   cones->SetPalette(pal);
   cones->Reset(TEveBoxSet::kBT_Cone, kFALSE, 64);
 
   Float_t a = 40; // max distance between cones
   TEveVector dir, pos;
   Float_t theta, phi, height, rad;
   for (Int_t i = 0; i < num; ++i) {
      theta = r.Uniform(0, TMath::Pi());
      phi = r.Uniform(-TMath::Pi(), TMath::Pi());
      height = r.Uniform(5, 15);
      rad = r.Uniform(3, 5);
      dir.Set(Cos(phi) * Cos(theta), Sin(phi) * Cos(theta), Sin(theta));
      dir *= height;
      pos.Set(r.Uniform(-a, a), r.Uniform(-a, a), r.Uniform(-a, a));
 
      cones->AddCone(pos, dir, rad);
      cones->DigitValue(r.Uniform(0, 500));
 
      // draw axis line 30% longer than cone height
      end = pos + dir * 1.3f;
      end.fZ);
   }
 
   // by default cone cap not drawn
   if (r.Integer(2) > 0)
      cones->SetDrawConeCap(kTRUE);
 
   cones->RefitPlex();
   TEveTrans &t = cones->RefMainTrans();
   t.SetPos(x, y, z);
 
   gEve->AddElement(cones);
   gEve->AddElement(lines);
 
   gEve->Redraw3D(kTRUE);
 
   return cones;
}
 
TEveBoxSet *elliptic_boxset_cones(Float_t x = 0, Float_t y = 0, Float_t z = 0, Int_t num = 100, Bool_t register = kTRUE)
{
   TEveManager::Create();
 
   using namespace TMath;
 
   TEveManager::Create();
 
   auto lines = new TEveStraightLineSet("StraightLines");
   lines->SetLineColor(kYellow);
   lines->SetLineWidth(2);
 
   TRandom r(0);
 
   auto cones = new TEveBoxSet("EllipticConeSet");
   cones->Reset(TEveBoxSet::kBT_EllipticCone, kTRUE, 64);
 
   cones->SetPickable(kTRUE);
 
   Float_t a = 40; // max distance between cones
   TEveVector dir, pos;
   Float_t theta, phi, height, rad;
   for (Int_t i = 0; i < num; ++i) {
      theta = r.Uniform(0, TMath::Pi());
      phi = r.Uniform(-TMath::Pi(), TMath::Pi());
      height = r.Uniform(5, 15);
      rad = r.Uniform(3, 5);
      dir.Set(Cos(phi) * Cos(theta), Sin(phi) * Cos(theta), Sin(theta));
      dir *= height;
      pos.Set(r.Uniform(-a, a), r.Uniform(-a, a), r.Uniform(-a, a));
 
      cones->AddEllipticCone(pos, dir, rad, 0.5 * rad, r.Uniform(0, 360));
      cones->DigitColor(r.Uniform(20, 255), r.Uniform(20, 255), r.Uniform(20, 255), r.Uniform(20, 255));
 
      // draw axis line 30% longer than cone height
      end = pos + dir * 1.3f;
      end.fZ);
   }
 
   // by default cone cap not drawn
   if (r.Integer(2) > 0)
      cones->SetDrawConeCap(kTRUE);
 
   cones->RefitPlex();
   TEveTrans &t = cones->RefMainTrans();
   t.SetPos(x, y, z);
 
   gEve->AddElement(cones);
   gEve->AddElement(lines);
 
   gEve->Redraw3D(kTRUE);
 
   return cones;
}