box.C

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/// \file
/// \ingroup tutorial_eve
/// Demonstrates usage of TEveBox class.
///
/// \image html eve_box.png
/// \macro_code
///
/// \author Matevz Tadel
#include <ROOT/REveBox.hxx>
#include <ROOT/REveScene.hxx>
#include <ROOT/REveManager.hxx>
 
using namespace ROOT::Experimental;
 
REveBox *box(Float_t a = 10, Float_t d = 5, Float_t x = 0, Float_t y = 0, Float_t z = 0)
{
   auto gEve = REveManager::Create();
 
   TRandom &r = *gRandom;
 
   auto b = new REveBox;
   b->SetMainColor(kCyan);
   b->SetMainTransparency(0);
 
#define RND_BOX(x) r.Uniform(-(x), (x))
   b->SetVertex(0, x - a + RND_BOX(d), y - a + RND_BOX(d), z - a + RND_BOX(d));
   b->SetVertex(1, x - a + RND_BOX(d), y + a + RND_BOX(d), z - a + RND_BOX(d));
   b->SetVertex(2, x + a + RND_BOX(d), y + a + RND_BOX(d), z - a + RND_BOX(d));
   b->SetVertex(3, x + a + RND_BOX(d), y - a + RND_BOX(d), z - a + RND_BOX(d));
   b->SetVertex(4, x - a + RND_BOX(d), y - a + RND_BOX(d), z + a + RND_BOX(d));
   b->SetVertex(5, x - a + RND_BOX(d), y + a + RND_BOX(d), z + a + RND_BOX(d));
   b->SetVertex(6, x + a + RND_BOX(d), y + a + RND_BOX(d), z + a + RND_BOX(d));
   b->SetVertex(7, x + a + RND_BOX(d), y - a + RND_BOX(d), z + a + RND_BOX(d));
#undef RND_BOX
 
   gEve->GetEventScene()->AddElement(b);
   gEve->Show();
 
   return b;
}