Draw macros for histogram

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1

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Hi, i made a simple macros DrawBox.C :

void DrawBox (double energy)
{
  TBox box (0.02, energy - 0.02, 0.06, energy + 0.02);
  box.SetLineColor(1);
  box.SetFillStyle(0);
  box.SetLineWidth(2);
  box.Draw();
}

I open histogram in .root file, use DrawBox, but box didn’t draw on histogram. Why&

2

box.DrawClone();

3

It works, thanks.

Can I build a box right away in a histogram when creating or filling in?

12 
{
  TH1F *h = new TH1F("h", "h", 100, -3., 3.);
  h->FillRandom("gaus", 5000); // fill here ...
#if 1 /* 0 or 1 */
  TBox *box = new TBox(1.75, 80., 2.75, 100.);
  box->SetLineColor(1);
  box->SetFillStyle(0);
  box->SetLineWidth(2);
  h->GetListOfFunctions()->Add(box);
#endif /* 0 or 1 */
  h->FillRandom("gaus", 5000); // ... or/and here
  h->Draw();
}