annotation.C: Demonstrates usage of TGLAnnotation class.
// @(#)root/eve:$Id$
// Author: Alja Mrak-Tadel
// Demonstrates usage of TGLAnnotation class.
#include <TEveManager.h>
#include <TGLViewer.h>
#include <TGLAnnotation.h>
#include <TEveBox.h>
#include <TDatime.h>
#include <TTimer.h>
#include <TDatime.h>
class MyTimer : public TTimer
{
private:
TGLAnnotation* m_label;
public:
MyTimer(TGLAnnotation* x) : TTimer(1000), m_label(x)
{
}
virtual Bool_t Notify()
{
// stop timer
TurnOff();
// so some action here
TDatime d;
m_label->SetText(d.AsString());
gEve->GetDefaultGLViewer()->RequestDraw();
// start timer
SetTime(1000);
Reset();
TurnOn();
return true;
}
};
void annotation(Float_t a=10, Float_t d=5, Float_t x=0, Float_t y=0, Float_t z=0)
{
TEveManager::Create();
// add a box in scene
TEveBox* b = new TEveBox("Box", "Test Title");
b->SetMainColor(kCyan);
b->SetMainTransparency(0);
b->SetVertex(0, x - a, y - a, z - a);
b->SetVertex(1, x - a, y + a, z - a);
b->SetVertex(2, x + a, y + a, z - a);
b->SetVertex(3, x + a, y - a, z - a);
b->SetVertex(4, x - a, y - a, z + a);
b->SetVertex(5, x - a, y + a, z + a);
b->SetVertex(6, x + a, y + a, z + a);
b->SetVertex(7, x + a, y - a, z + a);
gEve->AddElement(b);
gEve->Redraw3D(kTRUE);
// add overlay text
TGLViewer* v = gEve->GetDefaultGLViewer();
TDatime time;
TGLAnnotation* ann = new TGLAnnotation(v, time.AsString(), 0.1, 0.9);
ann->SetTextSize(0.1);// % of window diagonal
// set timer to update text every second
MyTimer* timer = new MyTimer(ann);
timer->SetTime(1000);
timer->Reset();
timer->TurnOn();
}