TLatex: subscript far below with integral

[furutaka]

Hi…

The following code fragment

{
  TCanvas TL("TL","TL", 500,500);
  TL.SetGrid();
  TL.DrawFrame(0,0,1,1);
  TLatex latex;
  latex.SetTextSize(0.1);
  latex.DrawLatex(0.2, 0.85, "f^{2}_{trans}(E)");
  latex.DrawLatex(0.2, 0.50, "#int dE f^{2}_{trans}(E)");
  latex.DrawLatex(0.2, 0.15, "#int f^{2}_{trans}(E) dE");
  TL.Print("intTlatex.png");
}

yields this:

TLatex subscripts go far below the baselines of their respective texts when used with #int; rather, it seems the subscripts were aligned to the baselines of integral characters…
How can I avoid this and make the positions of subscripts correct?

Thanks in advance.
Kazuyoshi

---

Please read tips for efficient and successful posting and posting code

ROOT Version: 6.23/01
Platform: linuxx8664gcc
Compiler: c++ (GCC) 10.1.1 20200507 (Red Hat 10.1.1-1)

---

[dastudillo]

Try adding a space and a negative space between the superscript and subscript:

 latex.DrawLatex(0.1, 0.4, "#int f^{2} #kern[-0.2]{ _{trans} (E) dE}");  // note the space before _{trans}

or just:

 latex.DrawLatex(0.1, 0.4, "#int f^{2} #kern[-0.15]{_{trans} (E) dE}");

https://root.cern/doc/v610/classTLatex.html#L11

[dastudillo]

A cleaner alternative: add empty limits on the integral:

 latex.DrawLatex(0.4, 0.8, "#int f^{2} #kern[-0.2]{ _{trans} (E) dE}");
 latex.DrawLatex(0.4, 0.6, "#int f^{2} #kern[-0.15]{_{trans} (E) dE}");
 latex.DrawLatex(0.4, 0.2, "#int^{}_{} f^{2}_{trans} (E) dE");

[furutaka]

Thanks!

Is this an intended feature? or a bug?

[dastudillo]

Maybe one of the developers can answer that, but they actually mention this (and the last solution I mentioned) in the same page I linked above, at the bottom of the “Subscripts and Superscripts” section (first section of the page).

[couet]

#int is implicitly waiting for limits. If you do not need them specify empty ones:

  latex.DrawLatex(0.2, 0.50, "#int^{}_{} f^{2}_{trans}(E) dE");