const Double_t gUserSizeX = 20;
const Double_t gUserSizeY = 10;

TObject* add_pave(TH2I* Hist, Double_t Xuser, Double_t Yuser) {
   TPaveLabel* label = new TPaveLabel(Xuser, Yuser, Xuser+gUserSizeX, Yuser+gUserSizeY, "Pave", "");
   return label;
}

TObject* add_latex(TH2I* Hist, Double_t Xuser, Double_t Yuser) {
TLatex* label = new TLatex(Xuser, Yuser, "Latex");
   return label;
}

TObject* add_box(TH2I* Hist, Double_t Xuser, Double_t Yuser) {
TBox* label = new TBox(Xuser, Yuser, Xuser+gUserSizeX, Yuser+gUserSizeY);
label->SetFillColor(kRed);
   return label;
}

TObject* add_label(TH2I* Hist, Double_t Xuser, Double_t Yuser) {
TLabel* label = new TLabel(Xuser, Yuser, Xuser+gUserSizeX, Yuser+gUserSizeY, "label"); 
   return label;
}

TObject* add_labelfixed(TH2I* Hist, Double_t Xuser, Double_t Yuser) {
TLabel* label = new TLabel(Xuser, Yuser, Xuser+gUserSizeX, Yuser+gUserSizeY, "labelfixed");
label->FixNDCSize();
   return label;
}

void testlabel() {
   auto hist = new TH2I("histname", "label comparison", 100, 0, 100, 100, 0, 100);
   TObject* pave = add_pave(hist, 10, 90);
   TObject* latex = add_latex(hist, 10, 70);
   TObject* box = add_box(hist, 10, 10);
   TObject* label = add_label(hist, 10, 30);
   TObject* fixed = add_labelfixed(hist, 10, 50);
   hist->Draw();
   pave->Draw();
   latex->Draw();
   box->Draw();
   label->Draw();
   fixed->Draw();
}