TLatex.cxx

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// @(#)root/graf:$Id$
// Author: Nicolas Brun, Olivier Couet, Oleksandr Grebenyuk
 
/*************************************************************************
 * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
#include <iostream>
#include "TROOT.h"
#include "TLatex.h"
#include "TMathText.h"
#include "TMath.h"
#include "TVirtualPad.h"
#include "TVirtualPS.h"
#include "TVirtualX.h"
#include "snprintf.h"
 
const Double_t kPI = TMath::Pi();
 
 
/** \class TLatex
\ingroup BasicGraphics
 
To draw Mathematical Formula.
 
TLatex's purpose is to write mathematical equations. The syntax is very similar
to the Latex's one. It provides several functionalities:
 
- [Subscripts and Superscripts](\ref L1)
- [Fractions](\ref L2)
- [Splitting Lines](\ref L3)
- [Roots](\ref L4)
- [Mathematical Symbols](\ref L5)
- [Delimiters](\ref L6)
- [Greek Letters](\ref L7)
- [Accents](\ref L8)
- [Changing Style](\ref L9)
- [Alignment Rules](\ref L10)
- [Character Adjustment](\ref L11)
- [Italic and Boldface](\ref L12)
- [Examples](\ref L13)
- [Interface to TMathText](\ref L14)
- [URL links](\ref L15)
 
When the font precision (see `TAttText`) is low (0 or 1), TLatex is
painted as a normal TText, the control characters are not interpreted.
 
\anchor L1
## Subscripts and Superscripts
Subscripts and superscripts are made with the `_` and `^`
commands. These commands can be combined to make complicated subscript and
superscript expressions. You may adjust the display of subscripts and
superscripts by using the two functions `SetIndiceSize(Double_t)`,
which set relative size of subscripts and superscripts, and
`SetLimitIndiceSize(Int_t)`, which set limits for text resizing of
subscripts and superscripts.
 
Examples:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,500);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Double_t dy = 1./7.;
   Tl.DrawText(.1, dy,   "x^{2y} :");    Tl.DrawLatex(.5, dy,   "x^{2y}");
   Tl.DrawText(.1, 2*dy, "x_{2y} :");    Tl.DrawLatex(.5, 2*dy, "x_{2y}");
   Tl.DrawText(.1, 3*dy, "x^{y^{2}} :"); Tl.DrawLatex(.5, 3*dy, "x^{y^{2}}");
   Tl.DrawText(.1, 4*dy, "x^{y_{1}} :"); Tl.DrawLatex(.5, 4*dy, "x^{y_{1}}");
   Tl.DrawText(.1, 5*dy, "x^{y}_{1} :"); Tl.DrawLatex(.5, 5*dy, "x^{y}_{1}");
   Tl.DrawText(.1, 6*dy, "x_{1}^{y} :"); Tl.DrawLatex(.5, 6*dy, "x_{1}^{y}");
}
End_Macro
 
The best way to put the subscripts and superscripts before the character and not
after, is to use an empty character:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,100);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Tl.DrawText(.1, .5,   "{}^{40}_{20}Ca :"); Tl.DrawLatex(.5, .5, "{}^{40}_{20}Ca");
}
End_Macro
 
The subscripts and superscripts operators apply not only on one character but
on all the "normal text" preceding them. In the following example the second
`E` is lower than the first one because the operator `_` is
applied on `/f` which has a descending part, and not only on `f`
which as no descending part.
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,100);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Tl.DrawText(.1, .5,   "f_{E}/f_{E} :"); Tl.DrawLatex(.5, .5, "f_{E}/f_{E}");
}
End_Macro
 
To make sure the second operator `_` applies only on `f` a dummy operator `^{}`
should be introduced to separate the `f` from the `/`.
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,100);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Tl.DrawText(.1, .5,   "f_{E}/^{}f_{E} :"); Tl.DrawLatex(.5, .5, "f_{E}/^{}f_{E}");
}
End_Macro
 
\anchor L2
## Fractions
Fractions denoted by the `/` symbol are made in the obvious way.
The `#frac` command is used for large fractions in displayed formula;
it has two arguments: the numerator and the denominator.
 
Examples:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,100);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Tl.DrawText(.1, .5,   "x = #frac{y+z/2}{y^{2}+1} :"); Tl.DrawLatex(.5, .5, "x = #frac{y+z/2}{y^{2}+1}");
}
End_Macro
 
\anchor L3
## Splitting Lines
Text can be split in two lines via the command `#splitline`.
 
Examples:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,100);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Tl.DrawText(.1, .5,   "#splitline{21 April 2003}{14:02:30} :"); Tl.DrawLatex(.6, .5, "#splitline{21 April 2003}{14:02:30}");
}
End_Macro
 
\anchor L4
## Roots
The `#sqrt` command produces the square root of its argument; it has
an optional first argument for other roots.
 
Examples:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,100);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Tl.DrawText(.1, .5,   "#sqrt{10} #sqrt[3]{10} :"); Tl.DrawLatex(.5, .5, "#sqrt{10} #sqrt[3]{10}");
}
End_Macro
 
\anchor L5
## Mathematical Symbols
TLatex can display dozens of special mathematical symbols. A few of them, such
as `+` and `>` , are produced by typing the corresponding
keyboard character. Others are obtained with the commands in the following
table:
 
Begin_Macro
mathsymbols.C
End_Macro
 
 
\anchor L6
## Delimiters
TLatex provides 4 kinds of proportional delimiters:
 
    #[]{....} or "a la" Latex #left[.....#right] : big square brackets
    #{}{....} or              #left{.....#right} : big curly brackets
    #||{....} or              #left|.....#right| : big absolute value symbols
    #(){....} or              #left(.....#right) : big parentheses
 
\anchor L7
## Greek Letters
The command to produce a lowercase Greek letter is obtained by adding a
`#` to the name of the letter. For an uppercase Greek letter, just
capitalize the first letter of the command name. Some letters have two
representations. The name of the second one (the "variation") starts with "var".
The following table gives the complete list:
 
Begin_Macro
greekletters.C
End_Macro
 
 
\anchor L8
## Accents
Several kind of accents are available:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,300);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Tl.DrawText(.1, .10,   "#hat : ");   Tl.DrawLatex(.3, .10, " #hat{a} ");
   Tl.DrawText(.1, .23,   "#check : "); Tl.DrawLatex(.3, .23, " #check{a} ");
   Tl.DrawText(.1, .36,   "#acute : "); Tl.DrawLatex(.3, .36, " #acute{a} ");
   Tl.DrawText(.1, .50,   "#grave : "); Tl.DrawLatex(.3, .50, " #grave{a} ");
   Tl.DrawText(.1, .63,   "#dot : ");   Tl.DrawLatex(.3, .63, " #dot{a} ");
   Tl.DrawText(.1, .76,   "#ddot : ");  Tl.DrawLatex(.3, .76, " #ddot{a} ");
   Tl.DrawText(.1, .90,   "#tilde : "); Tl.DrawLatex(.3, .90, " #tilde{a} ");
}
End_Macro
 
 
The special sign: `#slash` draws a slash on top of the text between brackets:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,100);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Tl.DrawText(.1, .5,   "#slash{E}_{T} :"); Tl.DrawLatex(.5, .5, "#slash{E}_{T}");
}
End_Macro
 
Bar and vectors sign are done the following way:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,700,100);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Tl.DrawText(.1, .5,   "#bar{a} and #vec{a} :"); Tl.DrawLatex(.5, .5, "#bar{a} and #vec{a}");
}
End_Macro
 
\anchor L9
## Changing Style
One can change the font, the text color, or the text size at any time using :
`#font[font-number]{...}`, `#color[color-number]{...}`
and `#scale[scale-factor]{...}`
 
Examples:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,900,300);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Double_t dy = 1./4.;
   Tl.DrawText(.01, dy,   "#font[12]{Times Italic} and #font[22]{Times bold} :");    Tl.DrawLatex(.7, dy,   "#font[12]{Times Italic} and #font[22]{Times bold}");
   Tl.DrawText(.01, 2*dy, "#color[2]{Red} and #color[4]{Blue} :");    Tl.DrawLatex(.7, 2*dy, "#color[2]{Red} and #color[4]{Blue}");
   Tl.DrawText(.01, 3*dy, "#scale[1.2]{Bigger} and #scale[0.8]{Smaller} :"); Tl.DrawLatex(.7, 3*dy, "#scale[1.2]{Bigger} and #scale[0.8]{Smaller}");
}
End_Macro
 
\anchor L10
## Alignment Rules
The `TText` alignment rules apply to the `TLatex` objects with one exception
concerning the vertical alignment:
 
- if the vertical alignment = 1 , subscripts are not taken into account
- if the vertical alignment = 0 , the text is aligned to the box surrounding
                                  the full text with sub and superscripts
 
This is illustrated by the following example:
 
Begin_Macro(source)
{
   TCanvas Tlva("Tlva","Tlva",500,500);
   Tlva.SetGrid();
   Tlva.DrawFrame(0,0,1,1);
   const char *longstring = "K_{S}... K^{*0}... #frac{2s}{#pi#alpha^{2}} #frac{d#sigma}{dcos#theta} (e^{+}e^{-} #rightarrow f#bar{f} ) = #left| #frac{1}{1 - #Delta#alpha} #right|^{2} (1+cos^{2}#theta)";
 
   TLatex latex;
   latex.SetTextSize(0.025);
   latex.SetTextAlign(13);  //align at top
   latex.DrawLatex(.2,.9,"K_{S}");
   latex.DrawLatex(.3,.9,"K^{*0}");
   latex.DrawLatex(.2,.8,longstring);
 
   latex.SetTextAlign(12);  //centered
   latex.DrawLatex(.2,.6,"K_{S}");
   latex.DrawLatex(.3,.6,"K^{*0}");
   latex.DrawLatex(.2,.5,longstring);
 
   latex.SetTextAlign(11);  //default bottom alignment
   latex.DrawLatex(.2,.4,"K_{S}");
   latex.DrawLatex(.3,.4,"K^{*0}");
   latex.DrawLatex(.2,.3,longstring);
 
   latex.SetTextAlign(10);  //special bottom alignment
   latex.DrawLatex(.2,.2,"K_{S}");
   latex.DrawLatex(.3,.2,"K^{*0}");
   latex.DrawLatex(.2,.1,longstring);
 
   latex.SetTextAlign(12);
   latex.SetTextFont(72);
   latex.DrawLatex(.1,.80,"13");
   latex.DrawLatex(.1,.55,"12");
   latex.DrawLatex(.1,.35,"11");
   latex.DrawLatex(.1,.18,"10");
   return Tlva;
}
End_Macro
 
 
\anchor L11
## Character Adjustment
 
The two commands `#kern` and `#lower` enable a better control
over character placement. The command `#kern[(Float_t)dx]{text}` moves
the output string horizontally by the fraction `dx` of its length.
Similarly, `#lower[(Float_t)dy]{text}` shifts the text up or down by
the fraction `dy` of its height.
 
Examples:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,900,300);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   TLatex Tt; Tt.SetTextFont(43); Tt.SetTextSize(16);
   Double_t dy = 1./7.;
   Tl.DrawLatex(.5,   dy, "Positive k#kern[0.3]{e}#kern[0.3]{r}#kern[0.3]{n}#kern[0.3]{i}#kern[0.3]{n}#kern[0.3]{g}");
   Tt.DrawText(.01, 2*dy, "Positive k#kern[0.3]{e}#kern[0.3]{r}#kern[0.3]{n}#kern[0.3]{i}#kern[0.3]{n}#kern[0.3]{g} :");
   Tl.DrawLatex(.5, 3*dy, "Negative k#kern[-0.3]{e}#kern[-0.3]{r}#kern[-0.3]{n}#kern[-0.3]{i}#kern[-0.3]{n}#kern[-0.3]{g}");
   Tt.DrawText(.01, 4*dy, "Negative k#kern[-0.3]{e}#kern[-0.3]{r}#kern[-0.3]{n}#kern[-0.3]{i}#kern[-0.3]{n}#kern[-0.3]{g} :");
   Tl.DrawLatex(.5, 5*dy, "Vertical a#lower[0.2]{d}#lower[0.4]{j}#lower[0.1]{u}#lower[-0.1]{s}#lower[-0.3]{t}#lower[-0.4]{m}#lower[-0.2]{e}#lower[0.1]{n}t");
   Tt.DrawText(.01, 6*dy, "Vertical a#lower[0.2]{d}#lower[0.4]{j}#lower[0.1]{u}#lower[-0.1]{s}#lower[-0.3]{t}#lower[-0.4]{m}#lower[-0.2]{e}#lower[0.1]{n}t :");
 
}
End_Macro
 
\anchor L12
## Italic and Boldface
Text can be turned italic or boldface using the commands
`#it` and `#bf`.
 
Examples:
 
Begin_Macro
{
   TCanvas *cl = new TCanvas("cl","cl",10,10,900,300);
   TLatex Tl; Tl.SetTextFont(43); Tl.SetTextSize(20);
   Double_t dy = 1./3.;
   Tl.DrawText(.01, dy,   "abc#alpha#beta#gamma, #it{abc#alpha#beta#gamma} :");    Tl.DrawLatex(.7, dy,   "abc#alpha#beta#gamma, #it{abc#alpha#beta#gamma}");
   Tl.DrawText(.01, 2*dy, "#bf{bold}, #it{italic}, #bf{#it{bold italic}}, #bf{#bf{unbold}} :");    Tl.DrawLatex(.7, 2*dy, "#bf{bold}, #it{italic}, #bf{#it{bold italic}}, #bf{#bf{unbold}}");
}
End_Macro
 
\anchor L13
## Examples
 
Begin_Macro(source)
{
   TCanvas ex1("ex1","Latex",500,600);
   TLatex Tl;
   Tl.SetTextAlign(12);
   Tl.SetTextSize(0.04);
   Tl.DrawLatex(0.1,0.8,"1)   C(x) = d #sqrt{#frac{2}{#lambdaD}}  #int^{x}_{0}cos(#frac{#pi}{2}t^{2})dt");
   Tl.DrawLatex(0.1,0.6,"2)   C(x) = d #sqrt{#frac{2}{#lambdaD}}  #int^{x}cos(#frac{#pi}{2}t^{2})dt");
   Tl.DrawLatex(0.1,0.4,"3)   R = |A|^{2} = #frac{1}{2}(#[]{#frac{1}{2}+C(V)}^{2}+#[]{#frac{1}{2}+S(V)}^{2})");
   Tl.DrawLatex(0.1,0.2,"4)   F(t) = #sum_{i=-#infty}^{#infty}A(i)cos#[]{#frac{i}{t+i}}");
   return ex1;
}
End_Macro
Begin_Macro(source)
{
   TCanvas ex2("ex2","Latex",500,300);
   TLatex Tl;
   Tl.SetTextAlign(23);
   Tl.SetTextSize(0.08);
   Tl.DrawLatex(0.5,0.95,"e^{+}e^{-}#rightarrowZ^{0}#rightarrowI#bar{I}, q#bar{q}");
   Tl.DrawLatex(0.5,0.75,"|#vec{a}#bullet#vec{b}|=#Sigmaa^{i}_{jk}+b^{bj}_{i}");
   Tl.DrawLatex(0.5,0.5,"i(#partial_{#mu}#bar{#psi}#gamma^{#mu}+m#bar{#psi}=0#Leftrightarrow(#Box+m^{2})#psi=0");
   Tl.DrawLatex(0.5,0.3,"L_{em}=eJ^{#mu}_{em}A_{#mu} , J^{#mu}_{em}=#bar{I}#gamma_{#mu}I , M^{j}_{i}=#SigmaA_{#alpha}#tau^{#alphaj}_{i}");
   return ex2;
}
End_Macro
Begin_Macro(source)
{
   TCanvas ex3("ex3","Latex",500,300);
   TPaveText pt(.1,.1,.9,.9);
   pt.AddText("#frac{2s}{#pi#alpha^{2}}  #frac{d#sigma}{dcos#theta} (e^{+}e^{-} #rightarrow f#bar{f} ) = ");
   pt.AddText("#left| #frac{1}{1 - #Delta#alpha} #right|^{2} (1+cos^{2}#theta");
   pt.AddText("+ 4 Re #left{ #frac{2}{1 - #Delta#alpha} #chi(s) #[]{#hat{g}_{#nu}^{e}#hat{g}_{#nu}^{f} (1 + cos^{2}#theta) + 2 #hat{g}_{a}^{e}#hat{g}_{a}^{f} cos#theta) } #right}");
   pt.SetLabel("Born equation");
   pt.Draw();
   return ex3;
}
End_Macro
 
 
\anchor L14
## Interface to TMathText
 
The class `TMathText` is a TeX math formulae interpreter. It uses plain
TeX syntax and uses "\\" as control instead of "#". If a piece of text containing
"\\" is given to `TLatex` then `TMathText` is automatically invoked.
Therefore, as histograms' titles, axis titles, labels etc ... are drawn using
`TLatex`, the `TMathText` syntax can be used for them also.
 
\anchor L15
## URL links
JSROOT and standard SVG output support the syntax '#url[link]{label}'.
This can be combined with other LaTeX commands, such as color or font settings.
Begin_Macro(source)
{
   auto cl = new TCanvas("cl", "Use of #url in TLatex", 1200, 800);
   auto latex = new TLatex(0.5, 0.5, "Link on #color[4]{#url[https://root.cern]{root.cern}} web site");
   latex->SetTextSize(0.1);
   latex->SetTextAlign(22);
   latex->Draw();
   cl->Print("cl.svg");
}
End_Macro
*/
 
////////////////////////////////////////////////////////////////////////////////
/// Default constructor.
 
TLatex::TLatex()
{
   fFactorSize  = 1.5;
   fFactorPos   = 0.6;
   fError       = nullptr;
   fShow        = kFALSE;
   fOriginSize  = 0.04;
   fItalic      = kFALSE;
   fLimitFactorSize = 3;
   SetLineWidth(2);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Normal constructor.
 
TLatex::TLatex(Double_t x, Double_t y, const char *text)
       :TText(x,y,text)
{
   fFactorSize  = 1.5;
   fFactorPos   = 0.6;
   fError       = nullptr;
   fShow        = kFALSE;
   fOriginSize  = 0.04;
   fItalic      = kFALSE;
   fLimitFactorSize = 3;
   SetLineWidth(2);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Destructor.
 
TLatex::~TLatex()
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// Copy constructor.
 
TLatex::TLatex(const TLatex &latex) : TText(latex), TAttLine(latex)
{
   fFactorSize  = 1.5;
   fFactorPos   = 0.6;
   fError       = nullptr;
   fShow        = kFALSE;
   fOriginSize  = 0.04;
   fItalic      = kFALSE;
   fLimitFactorSize = 3;
   latex.TLatex::Copy(*this);
}
 
////////////////////////////////////////////////////////////////////////////////
///assignment operator
 
TLatex& TLatex::operator=(const TLatex& lt)
{
   if (this != &lt) {
      TText::operator=(lt);
      TAttLine::operator=(lt);
      fFactorSize = lt.fFactorSize;
      fFactorPos = lt.fFactorPos;
      fLimitFactorSize = lt.fLimitFactorSize;
      fError = lt.fError;
      fShow = lt.fShow;
      fTabSize = lt.fTabSize;
      fOriginSize = lt.fOriginSize;
      fItalic = lt.fItalic;
   }
   return *this;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Copy this TLatex object to another TLatex.
 
void TLatex::Copy(TObject &obj) const
{
   TText::Copy(obj);
   TAttLine::Copy((TLatex &)obj);
   ((TLatex&)obj).fFactorSize  = fFactorSize;
   ((TLatex&)obj).fFactorPos   = fFactorPos;
   ((TLatex&)obj).fLimitFactorSize  = fLimitFactorSize;
   ((TLatex&)obj).fError       = fError;
   ((TLatex&)obj).fShow        = fShow;
   ((TLatex&)obj).fTabSize     = fTabSize;
   ((TLatex&)obj).fOriginSize  = fOriginSize;
   ((TLatex&)obj).fItalic      = fItalic;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Rotate array of points around fX, fY coordinate by specified angle
 
void TLatex::Rotate(TVirtualPad *pad, Double_t angle, Int_t np, Double_t *x, Double_t *y)
{
   Double_t xOrigin, yOrigin;
   pad->XYtoAbsPixel(fX, fY, xOrigin, yOrigin);
 
   Double_t cos_angle = TMath::Cos(kPI*angle/180.);
   Double_t sin_angle = TMath::Sin(kPI*angle/180.);
   Double_t xx, yy;
   for (Int_t n = 0; n < np; ++n) {
      pad->AbsPixeltoXY( cos_angle * (x[n]-xOrigin) + sin_angle * (y[n]-yOrigin) + xOrigin,
                        -sin_angle * (x[n]-xOrigin) + cos_angle * (y[n]-yOrigin) + yOrigin,
                        xx, yy);
      x[n] = xx;
      y[n] = yy;
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Rotate single point around fX, fY coordinate by specified angle
 
void TLatex::Rotate(TVirtualPad *pad, Double_t angle, Double_t x, Double_t y, Double_t &xx, Double_t &yy)
{
   xx = x;
   yy = y;
   Rotate(pad, angle, 1, &xx, &yy);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Analyse function.
 
TLatex::TLatexFormSize TLatex::Anal1(const TextSpec_t &spec, const Char_t *t, Int_t length)
{
   return Analyse(0, 0, spec, t, length);
}
 
////////////////////////////////////////////////////////////////////////////////
///  Analyse and paint the TLatex formula
///
///  It is called twice : first for calculating the size of
///  each portion of the formula, then to paint the formula.
///  When analyse finds an operator or separator, it calls
///  itself recursively to analyse the arguments of the operator.
///  when the argument is an atom (normal text), it calculates
///  the size of it and return it as the result.
///  for example : if the operator #%frac{arg1}{arg2} is found :
///  Analyse(arg1) return the size of arg1 (width, up, down)
///  Analyse(arg2) return the size of arg2
///  now, we know the size of #%frac{arg1}{arg2}:
///
/// ~~~ {.cpp}
///  width = max(width_arg1, width_arg2)
///  up    = up_arg1 + down_arg1
///  down  = up_arg2 + down_arg2
/// ~~~
///
///  so, when the user wants to paint a fraction at position (x,y),
///  the rect used for the formula is : (x,y-up,x+width,y+down)
///
/// return size of zone occupied by the text/formula
///  - `t` : chain to be analyzed
///  - `length` : number of chars in t.
 
TLatex::TLatexFormSize TLatex::Analyse(Double_t x, Double_t y, const TextSpec_t &spec, const Char_t *t, Int_t length)
{
   const char *tab[] = { "alpha","beta","chi","delta","varepsilon","phi","gamma","eta","iota","varphi","kappa","lambda",
                "mu","nu","omicron","pi","theta","rho","sigma","tau","upsilon","varomega","omega","xi","psi","zeta",
                "Alpha","Beta","Chi","Delta","Epsilon","Phi","Gamma","Eta","Iota","vartheta",
                "Kappa","Lambda","Mu","Nu","Omicron","Pi","Theta","Rho","Sigma","Tau",
                "Upsilon","varsigma","Omega","Xi","Psi","Zeta","varUpsilon","epsilon"};
 
   const char *tab2[] = { "leq","/","infty","voidb","club","diamond","heart",
                 "spade","leftrightarrow","leftarrow","uparrow","rightarrow",
                 "downarrow","circ","pm","doublequote","geq","times","propto",
                 "partial","bullet","divide","neq","equiv","approx","3dots",
                 "cbar","topbar","downleftarrow","aleph","Jgothic","Rgothic","voidn",
                 "otimes","oplus","oslash","cap","cup","supset","supseteq",
                 "notsubset","subset","subseteq","in","notin","angle","nabla",
                 "oright","ocopyright","trademark","prod","surd","upoint","corner","wedge",
                 "vee","Leftrightarrow","Leftarrow","Uparrow","Rightarrow",
                 "Downarrow","diamond","LT","void1","copyright","void3","sum",
                 "arctop","lbar","arcbottom","topbar","void8", "bottombar","arcbar",
                 "ltbar","AA","aa","void06","GT","int","forall","exists" };
 
   const char *tab3[] = { "bar","vec","dot","hat","ddot","acute","grave","check","tilde","slash"};
 
   if (fError) return TLatexFormSize(0,0,0);
 
   Int_t nBlancDeb = 0, nBlancFin = 0, l_nBlancDeb = 0, l_nBlancFin = 0;
   Int_t i, k;
   Int_t min = 0, max = 0;
   Bool_t cont = kTRUE;
   while(cont) {
      // count leading blanks
      //while(nBlancDeb+nBlancFin<length && t[nBlancDeb]==' ') nBlancDeb++;
 
      if (nBlancDeb==length) return TLatexFormSize(0,0,0); // empty string
 
      // count trailing blanks
      //while(nBlancDeb+nBlancFin<length && t[length-nBlancFin-1]==' ') nBlancFin++;
 
      if (nBlancDeb==l_nBlancDeb && nBlancFin==l_nBlancFin) cont = kFALSE;
 
      // remove characters { }
      if (t[nBlancDeb]=='{' && t[length-nBlancFin-1]=='}') {
         Int_t nBrackets = 0;
         Bool_t sameBrackets = kTRUE;
         for(i=nBlancDeb;i<length-nBlancFin;i++) {
            if (t[i] == '{' && !(i>0 && t[i-1] == '@')) nBrackets++;
            if (t[i] == '}' && t[i-1]!= '@') nBrackets--;
            if (nBrackets==0 && i<length-nBlancFin-2) {
               sameBrackets=kFALSE;
               break;
            }
         }
 
         if (sameBrackets) {
            // begin and end brackets match
            nBlancDeb++;
            nBlancFin++;
            if (nBlancDeb+nBlancFin==length) return TLatexFormSize(0,0,0); // empty string
            cont = kTRUE;
         }
 
      }
 
      l_nBlancDeb = nBlancDeb;
      l_nBlancFin = nBlancFin;
   }
 
   // make a copy of the current processed chain of characters
   // removing leading and trailing blanks
   length -= nBlancFin+nBlancDeb; // length of string without blanks
   if (length <=0) {
      Error("Analyse", "It seems there is a syntax error in the TLatex string");
      return TLatexFormSize(0,0,0);
   }
   Char_t* text = new Char_t[length+1];
   strncpy(text,t+nBlancDeb,length);
   text[length] = 0;
 
   // compute size of subscripts and superscripts
   Double_t indiceSize = spec.fSize/fFactorSize;
   if(indiceSize<fOriginSize/TMath::Exp(fLimitFactorSize*TMath::Log(fFactorSize))-0.001f)
      indiceSize = spec.fSize;
   // subtract 0.001 because of rounding errors
   TextSpec_t specNewSize = spec;
   specNewSize.fSize       = indiceSize;
 
   // recherche des operateurs
   Int_t opPower         = -1;   // Position of first ^ (power)
   Int_t opUnder         = -1;   // Position of first _ (indice)
   Int_t opFrac          = -1;   // Position of first \frac
   Int_t opSqrt          = -1;   // Position of first \sqrt
   Int_t nBrackets       = 0;    // Nesting level in { }
   Int_t nCroch          = 0;    // Nesting level in [ ]
   Int_t opCurlyCurly    = -1;   // Position of first }{
   Int_t opSquareCurly   = -1;   // Position of first ]{
   Int_t opCloseCurly    = -2;   // Position of first }
   Int_t opColor         = -1;   // Position of first #color
   Int_t opUrl           = -1;   // Position of first #url
   Int_t opFont          = -1;   // Position of first #font
   Int_t opScale         = -1;   // Position of first #scale
   Int_t opGreek         = -1;   // Position of a Greek letter
   Int_t opSpec          = -1;   // position of a special character
   Int_t opAbove         = -1;   // position of a vector/overline
   Int_t opSquareBracket = 0 ;   // position of a "[]{" operator (#[]{arg})
   Int_t opBigCurly      = 0 ;   // position of a "{}{" operator (big curly bracket #{}{arg})
   Int_t opAbs           = 0 ;   // position of a "||{" operator (absolute value) (#||{arg})
   Int_t opParen         = 0 ;   // position of a "(){" operator (big parenthesis #(){arg})
   Int_t abovePlace      = 0 ;   // true if subscripts must be written above and not after
   Int_t opBox           = 0 ;   // position of #Box
   Int_t opPerp          = 0;    // position of #perp
   Int_t opOdot          = 0;    // position of #odot
   Int_t opHbar          = 0;    // position of #hbar
   Int_t opMinus         = 0;    // position of #minus
   Int_t opPlus          = 0;    // position of #plus
   Int_t opMp            = 0;    // position of #mp
   Int_t opBackslash     = 0;    // position of #backslash
   Int_t opParallel      = 0;    // position of #parallel
   Int_t opSplitLine     = -1;   // Position of first #splitline
   Int_t opKern          = -1;   // Position of first #kern
   Int_t opLower         = -1;   // Position of first #lower
   Int_t opBf            = -1;   // Position of first #bf
   Int_t opIt            = -1;   // Position of first #it
   Int_t opMbox          = -1;   // Position of first #mbox
 
   Bool_t opFound = kFALSE;
   Bool_t quote1 = kFALSE, quote2 = kFALSE ;
 
   for(i=0;i<length;i++) {
      switch (text[i]) {
         case '\'' : quote1 = !quote1 ; break ;
         case '"'  : quote2  = !quote2 ; break ;
      }
      //if (quote1 || quote2) continue ;
      switch (text[i]) {
         case '{':
            if (nCroch==0) {
               if (!(i>0 && text[i-1] == '@')) nBrackets++;
            }
            break;
         case '}':
            if (nCroch==0) {
               if (!(i>0 && text[i-1] == '@')) nBrackets--;
               if (nBrackets==0) {
                  if (i<length-1) if (text[i+1]=='{' && opCurlyCurly==-1) opCurlyCurly=i;
                  if (i<length-2) {
                     if (text[i+1]!='{' && !(text[i+2]=='{' && (text[i+1]=='^' || text[i+1]=='_'))
                     && opCloseCurly==-2) opCloseCurly=i;
                  }
                  else if (i<length-1) {
                     if (text[i+1]!='{' && opCloseCurly==-2) opCloseCurly=i;
                  }
                  else if (opCloseCurly==-2) opCloseCurly=i;
               }
            }
            break;
         case '[':
            if (nBrackets==0) {
               if (!(i>0 && text[i-1] == '@')) nCroch++;
            }
            break;
         case ']':
            if (nBrackets==0) {
               if (!(i>0 && text[i-1] == '@')) nCroch--;
               if (nCroch<0) {
                  // more "]" than "["
                  fError = "Missing \"[\"";
                  delete [] text;
                  return TLatexFormSize(0,0,0);
               }
            }
            break;
      }
      if (length>i+1) {
         Char_t buf[3];
         strncpy(buf,&text[i],2);
         if (strncmp(buf,"^{",2)==0) {
            if (opPower==-1 && nBrackets==0 && nCroch==0) opPower=i;
            if (i>3) {
               Char_t buf1[5];
               strncpy(buf1,&text[i-4],4);
               if (strncmp(buf1,"#int",4)==0) {
                  abovePlace = 1;
                  if (i>4 && opCloseCurly==-2) opCloseCurly=i-5;
               }
               if (strncmp(buf1,"#sum",4)==0) {
                  abovePlace = 2;
                  if (i>4 && opCloseCurly==-2) opCloseCurly=i-5;
               }
            }
         }
         if (strncmp(buf,"_{",2)==0) {
            if (opUnder==-1 && nBrackets==0 && nCroch==0) opUnder=i;
            if (i>3) {
               Char_t buf2[5];
               strncpy(buf2,&text[i-4],4);
               if (strncmp(buf2,"#int",4)==0) {
                  abovePlace = 1;
                  if (i>4 && opCloseCurly==-2) opCloseCurly=i-5;
               }
               if (strncmp(buf2,"#sum",4)==0) {
                  abovePlace = 2;
                  if (i>4 && opCloseCurly==-2) opCloseCurly=i-5;
               }
            }
         }
         if (strncmp(buf,"]{",2)==0)
            if (opSquareCurly==-1 && nBrackets==0 && nCroch==0) opSquareCurly=i;
      }
      // detect other operators
      if (text[i]=='\\' || (text[i]=='#' && !opFound && nBrackets==0 && nCroch==0)) {
 
         if (length>i+10) {
            Char_t buf[11];
            strncpy(buf,&text[i+1],10);
            if (strncmp(buf,"splitline{",10)==0) {
               opSplitLine=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
         }
         if (length>i+9) {
            Char_t buf[10];
            strncpy(buf,&text[i+1],9);
            if (!opBackslash && strncmp(buf,"backslash",9)==0) {
               opBackslash=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
         }
         if (length>i+8) {
            Char_t buf[9];
            strncpy(buf,&text[i+1],8);
            if (!opParallel && strncmp(buf,"parallel",8)==0) {
               opParallel=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
         }
         if (length>i+6) {
            Char_t buf[7];
            strncpy(buf,&text[i+1],6);
            if (strncmp(buf,"lower[",6)==0 || strncmp(buf,"lower{",6)==0) {
               opLower=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue ;
            }
            if (strncmp(buf,"scale[",6)==0 || strncmp(buf,"scale{",6)==0) {
               opScale=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue ;
            }
            if (strncmp(buf,"color[",6)==0 || strncmp(buf,"color{",6)==0) {
               opColor=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue ;
            }
         }
         if (length>i+5) {
            Char_t buf[6];
            strncpy(buf,&text[i+1],5);
            if (strncmp(buf,"frac{",5)==0) {
               opFrac=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (strncmp(buf,"sqrt{",5)==0 || strncmp(buf,"sqrt[",5)==0) {
               opSqrt=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (strncmp(buf,"font{",5)==0 || strncmp(buf,"font[",5)==0) {
               opFont=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (strncmp(buf,"kern[",5)==0 || strncmp(buf,"kern{",5)==0) {
               opKern=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue ;
            }
            if (!opMinus && strncmp(buf,"minus",5)==0) {
               opMinus=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (strncmp(buf,"mbox[",5)==0 || strncmp(buf,"mbox{",5)==0) {
               opMbox=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue ;
            }
         }
         if (length>i+4) {
            Char_t buf[5];
            strncpy(buf,&text[i+1],4);
            if (!opOdot && strncmp(buf,"odot",4)==0) {
               opOdot=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (!opHbar && strncmp(buf,"hbar",4)==0) {
               opHbar=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (!opPerp && strncmp(buf,"perp",4)==0) {
               opPerp=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (!opPlus && strncmp(buf,"plus",4)==0) {
               opPlus=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (strncmp(buf,"url[",4)==0 || strncmp(buf,"url{",4)==0) {
               opUrl=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue ;
            }
         }
         if (length>i+3) {
            Char_t buf[4];
            strncpy(buf,&text[i+1],3);
            buf[3] = 0;
            if (strncmp(buf,"[]{",3)==0) {
               opSquareBracket=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (strncmp(buf,"{}{",3)==0 ) {
               opBigCurly=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (strncmp(buf,"||{",3)==0) {
               opAbs=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (strncmp(buf,"(){",3)==0) {
               opParen=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (!opBox && strncmp(buf,"Box",3)==0) {
               opBox=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
            if (strncmp(buf,"bf[",3)==0 || strncmp(buf,"bf{",3)==0) {
               opBf=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue ;
            }
            if (strncmp(buf,"it[",3)==0 || strncmp(buf,"it{",3)==0) {
               opIt=i; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue ;
            }
         }
         if (length>i+2) {
            Char_t buf[3];
            strncpy(buf,&text[i+1],2);
            if (!opMp && strncmp(buf,"mp",2)==0) {
               opMp=1; opFound = kTRUE;
               if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               continue;
            }
         }
         for(k=0;k<54;k++) {
            if (!opFound && UInt_t(length)>i+strlen(tab[k])) {
               if (strncmp(&text[i+1],tab[k],strlen(tab[k]))==0) {
                  opGreek=k;
                  opFound = kTRUE;
                  if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               }
            }
         }
         for(k=0;k<10;k++) {
            if (!opFound && UInt_t(length)>i+strlen(tab3[k])) {
               if (strncmp(&text[i+1],tab3[k],strlen(tab3[k]))==0) {
                  opAbove=k;
                  opFound = kTRUE;
                  if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               }
            }
         }
         UInt_t lastsize = 0;
         if (!opFound)
         for(k=0;k<82;k++) {
            if ((opSpec==-1 || strlen(tab2[k])>lastsize) && UInt_t(length)>i+strlen(tab2[k])) {
               if (strncmp(&text[i+1],tab2[k],strlen(tab2[k]))==0) {
                  lastsize = strlen(tab2[k]);
                  opSpec=k;
                  opFound = kTRUE;
                  if (i>0 && opCloseCurly==-2) opCloseCurly=i-1;
               }
            }
         }
      }
   }
 
   TLatexFormSize fs1;
   TLatexFormSize fs2;
   TLatexFormSize fs3;
   TLatexFormSize result;
 
   // analysis of operators found
   if (opCloseCurly>-1 && opCloseCurly<length-1) { // separator } found
      if(!fShow) {
         fs1 = Anal1(spec,text,opCloseCurly+1);
         fs2 = Anal1(spec,text+opCloseCurly+1,length-opCloseCurly-1);
         Savefs(&fs1);
      } else {
         fs1 = Readfs();
         Analyse(x+fs1.Width(),y,spec,text+opCloseCurly+1,length-opCloseCurly-1);
         Analyse(x,y,spec,text,opCloseCurly+1);
      }
      result = fs1+fs2;
   }
 
   else if (opPower>-1 && opUnder>-1) { // ^ and _ found
      min = TMath::Min(opPower,opUnder);
      max = std::max(opPower,opUnder);
      Double_t xfpos = 0. ; //GetHeight()*spec.fSize/5.;
      Double_t prop=1, propU=1; // scale factor for #sum & #int
      switch (abovePlace) {
         case 1 :
            prop = .8 ; propU = 1.75 ; // Int
            break;
         case 2:
            prop = .9 ; propU = 1.75 ; // Sum
            break;
      }
     // propU acts on upper number
     // when increasing propU value, the upper indice position is higher
     // when increasing prop values, the lower indice position is lower
 
      if (!fShow) {
         Int_t ltext = min ;
         if (min >= 2 && strncmp(&text[min-2],"{}",2)==0) {
            // upper and lower indice before the character
            // like with chemical element
            snprintf(&text[ltext-2],length-(ltext-2),"I ") ;
            ltext-- ;
         }
         fs1 = Anal1(spec,text,ltext);
         fs2 = Anal1(specNewSize,text+min+1,max-min-1);
         fs3 = Anal1(specNewSize,text+max+1,length-max-1);
         Savefs(&fs1);
         Savefs(&fs2);
         Savefs(&fs3);
      } else {
         fs3 = Readfs();
         fs2 = Readfs();
         fs1 = Readfs();
         Double_t pos = 0;
         if (!abovePlace) {
            Double_t addW = fs1.Width()+xfpos, addH1, addH2;
            if (opPower<opUnder) {
               addH1 = -fs1.Over()*(fFactorPos)-fs2.Under();
               addH2 = fs1.Under()+fs3.Over()*(fFactorPos);
            } else {
               addH1 = fs1.Under()+fs2.Over()*(fFactorPos);
               addH2 = -fs1.Over()*(fFactorPos)-fs3.Under();
            }
            Analyse(x+addW,y+addH2,specNewSize,text+max+1,length-max-1);
            Analyse(x+addW,y+addH1,specNewSize,text+min+1,max-min-1);
         } else {
            Double_t addW1, addW2, addH1, addH2;
            Double_t m = std::max(fs1.Width(),std::max(fs2.Width(),fs3.Width()));
            pos = (m-fs1.Width())/2;
            if (opPower<opUnder) {
               addH1 = -fs1.Over()*propU-fs2.Under();
               addW1 = (m-fs2.Width())/2;
               addH2 = fs1.Under()*prop+fs3.Over();
               addW2 = (m-fs3.Width())/2;
            } else {
               addH1 = fs1.Under()*prop+fs2.Over();
               addW1 = (m-fs2.Width())/2;
               addH2 = -fs1.Over()*propU-fs3.Under();
               addW2 = (m-fs3.Width())/2;
            }
 
            Analyse(x+addW2,y+addH2,specNewSize,text+max+1,length-max-1);
            Analyse(x+addW1,y+addH1,specNewSize,text+min+1,max-min-1);
         }
 
         if (min >= 2 && strncmp(&text[min-2],"{}",2)==0) {
            snprintf(&text[min-2],length-(min-2),"  ") ;
            Analyse(x+pos,y,spec,text,min-1);
         } else {
            Analyse(x+pos,y,spec,text,min);
         }
      }
 
      if (!abovePlace) {
         if (opPower<opUnder) {
            result.Set(fs1.Width()+xfpos+std::max(fs2.Width(),fs3.Width()),
                       fs1.Over()*fFactorPos+fs2.Height(),
                       fs1.Under()+fs3.Height()-fs3.Over()*(1-fFactorPos));
         } else {
            result.Set(fs1.Width()+xfpos+std::max(fs2.Width(),fs3.Width()),
                       fs1.Over()*fFactorPos+fs3.Height(),
                       fs1.Under()+fs2.Height()-fs2.Over()*(1-fFactorPos));
         }
      } else {
         if (opPower<opUnder) {
            result.Set(std::max(fs1.Width(),std::max(fs2.Width(),fs3.Width())),
                       fs1.Over()*propU+fs2.Height(),fs1.Under()*prop+fs3.Height());
         } else {
            result.Set(std::max(fs1.Width(),std::max(fs2.Width(),fs3.Width())),
                       fs1.Over()*propU+fs3.Height(),fs1.Under()*prop+fs2.Height());
         }
      }
   }
   else if (opPower>-1) { // ^ found
      Double_t prop=1;
      Double_t xfpos = 0. ; //GetHeight()*spec.fSize/5. ;
      switch (abovePlace) {
         case 1 : //int
            prop = 1.75 ; break ;
         case 2 : // sum
            prop = 1.75;  break ;
      }
      // When increasing prop, the upper indice position is higher
      if (!fShow) {
         Int_t ltext = opPower ;
         if (ltext >= 2 && strncmp(&text[ltext-2],"{}",2)==0) {
            // upper and lower indice before the character
            // like with chemical element
            snprintf(&text[ltext-2],length-(ltext-2),"I ") ;
            ltext-- ;
         }
         fs1 = Anal1(spec,text,ltext);
         fs2 = Anal1(specNewSize,text+opPower+1,length-opPower-1);
         Savefs(&fs1);
         Savefs(&fs2);
      } else {
         fs2 = Readfs();
         fs1 = Readfs();
         Int_t pos = 0;
         if (!abovePlace){
            Double_t over = fs1.Over();
            if (over <= 0) over = 1.5*fs2.Over();
            Analyse(x+fs1.Width()+xfpos,y-over*fFactorPos-fs2.Under(),specNewSize,text+opPower+1,length-opPower-1);
         } else {
            Int_t pos2=0;
            if (fs2.Width()>fs1.Width())
               pos=Int_t((fs2.Width()-fs1.Width())/2);
            else
               pos2=Int_t((fs1.Width()-fs2.Width())/2);
 
            Analyse(x+pos2,y-fs1.Over()*prop-fs2.Under(),specNewSize,text+opPower+1,length-opPower-1);
         }
         if (opPower >= 2 && strncmp(&text[opPower-2],"{}",2)==0) {
            snprintf(&text[opPower-2],length-(opPower-2),"  ") ;
            Analyse(x+pos,y,spec,text,opPower-1);
         } else {
            Analyse(x+pos,y,spec,text,opPower);
         }
      }
 
      if (!abovePlace)
         result.Set(fs1.Width()+xfpos+fs2.Width(),
                    fs1.Over()*fFactorPos+fs2.Over(),fs1.Under());
      else
         result.Set(std::max(fs1.Width(),fs2.Width()),fs1.Over()*prop+fs2.Height(),fs1.Under());
 
   }
   else if (opUnder>-1) { // _ found
      Double_t prop = .9; // scale factor for #sum & #frac
      Double_t xfpos = 0.;//GetHeight()*spec.fSize/5. ;
      Double_t fpos = fFactorPos ;
      // When increasing prop, the lower indice position is lower
      if(!fShow) {
         Int_t ltext = opUnder ;
         if (ltext >= 2 && strncmp(&text[ltext-2],"{}",2)==0) {
            // upper and lower indice before the character
            // like with chemical element
            snprintf(&text[ltext-2],length-(ltext-2),"I ") ;
            ltext-- ;
         }
         fs1 = Anal1(spec,text,ltext);
         fs2 = Anal1(specNewSize,text+opUnder+1,length-opUnder-1);
         Savefs(&fs1);
         Savefs(&fs2);
      } else {
         fs2 = Readfs();
         fs1 = Readfs();
         Int_t pos = 0;
         if (!abovePlace)
            Analyse(x+fs1.Width()+xfpos,y+fs1.Under()+fs2.Over()*fpos,specNewSize,text+opUnder+1,length-opUnder-1);
         else {
            Int_t pos2=0;
            if (fs2.Width()>fs1.Width())
               pos=Int_t((fs2.Width()-fs1.Width())/2);
            else
               pos2=Int_t((fs1.Width()-fs2.Width())/2);
 
            Analyse(x+pos2,y+fs1.Under()*prop+fs2.Over(),specNewSize,text+opUnder+1,length-opUnder-1);
         }
         if (opUnder >= 2 && strncmp(&text[opUnder-2],"{}",2)==0) {
            snprintf(&text[opUnder-2],length-(opUnder-2),"  ") ;
            Analyse(x+pos,y,spec,text,opUnder-1);
         } else {
            Analyse(x+pos,y,spec,text,opUnder);
         }
      }
      if (!abovePlace)
         result.Set(fs1.Width()+xfpos+fs2.Width(),fs1.Over(),
                    fs1.Under()+fs2.Under()+fs2.Over()*fpos);
      else
         result.Set(std::max(fs1.Width(),fs2.Width()),fs1.Over(),fs1.Under()*prop+fs2.Height());
   }
   else if (opBox) {
      Double_t square = GetHeight()*spec.fSize/2;
      if (!fShow) {
         fs1 = Anal1(spec,text+4,length-4);
      } else {
         fs1 = Analyse(x+square,y,spec,text+4,length-4);
         Double_t adjust = GetHeight()*spec.fSize/20;
         Double_t x1 = x+adjust ;
         Double_t x2 = x-adjust+square ;
         Double_t y1 = y;
         Double_t y2 = y-square+adjust;
         DrawLine(x1,y1,x2,y1,spec);
         DrawLine(x2,y1,x2,y2,spec);
         DrawLine(x2,y2,x1,y2,spec);
         DrawLine(x1,y2,x1,y1,spec);
      }
      result = fs1 + TLatexFormSize(square,square,0);
   }
   else if (opOdot) {
      Double_t square = GetHeight()*spec.fSize/2;
      if (!fShow) {
         fs1 = Anal1(spec,text+5,length-5);
      } else {
         fs1 = Analyse(x+1.3*square,y,spec,text+5,length-5);
         Double_t adjust = GetHeight()*spec.fSize/20;
         Double_t r1 = 0.62*square;
         Double_t y1 = y-0.3*square-adjust;
         DrawCircle(x+0.6*square,y1,r1,spec) ;
         DrawCircle(x+0.6*square,y1,r1/100,spec) ;
      }
      result = fs1 + TLatexFormSize(square,square,0);
   }
   else if (opHbar) {
      Double_t square = GetHeight()*spec.fSize/2;
      if (!fShow) {
         fs1 = Anal1(spec,text+5,length-5);
      } else {
         fs1 = Analyse(x+square,y,spec,text+5,length-5);
         TText hbar;
         hbar.SetTextFont(12);
         hbar.SetTextColor(spec.fColor);
         hbar.SetTextSize(spec.fSize);
         hbar.SetTextAngle(fTextAngle);
         hbar.SetTextAlign(11);
         Double_t xx, yy;
         Rotate(gPad, spec.fAngle, x, y, xx, yy);
         hbar.PaintText(xx,yy,"h");
         DrawLine(x,y-0.8*square,x+0.75*square,y-square,spec);
      }
      result = fs1 + TLatexFormSize(square,square,0);
   }
   else if (opMinus) {
      Double_t square = GetHeight()*spec.fSize/2;
      if (!fShow) {
         fs1 = Anal1(spec,text+6,length-6);
      } else {
         fs1 = Analyse(x+square,y,spec,text+6,length-6);
         TText minus;
         minus.SetTextFont(122);
         minus.SetTextColor(spec.fColor);
         minus.SetTextSize(spec.fSize);
         minus.SetTextAngle(fTextAngle);
         minus.SetTextAlign(11);
         Double_t xx, yy;
         Rotate(gPad, spec.fAngle, x, y, xx, yy);
         minus.PaintText(xx,yy,"-");
      }
      result = fs1 + TLatexFormSize(square,square,0);
   }
   else if (opPlus) {
      Double_t square = GetHeight()*spec.fSize/2;
      if (!fShow) {
         fs1 = Anal1(spec,text+5,length-5);
      } else {
         fs1 = Analyse(x+square,y,spec,text+5,length-5);
         TText plus;
         plus.SetTextFont(122);
         plus.SetTextColor(spec.fColor);
         plus.SetTextSize(spec.fSize);
         plus.SetTextAngle(fTextAngle);
         plus.SetTextAlign(11);
         Double_t xx, yy;
         Rotate(gPad, spec.fAngle, x, y, xx, yy);
         plus.PaintText(xx,yy,"+");
      }
      result = fs1 + TLatexFormSize(square,square,0);
   }
   else if (opMp) {
      Double_t square = GetHeight()*spec.fSize/2;
      if (!fShow) {
         fs1 = Anal1(spec,text+3,length-3);
      } else {
         fs1 = Analyse(x+square,y,spec,text+3,length-3);
         TText mp;
         mp.SetTextFont(122);
         mp.SetTextColor(spec.fColor);
         mp.SetTextSize(spec.fSize);
         mp.SetTextAngle(fTextAngle+180);
         mp.SetTextAlign(11);
         Double_t xx, yy;
         Rotate(gPad, spec.fAngle, x+square, y-1.25*square, xx, yy);
         mp.PaintText(xx,yy,"\261");
      }
      result = fs1 + TLatexFormSize(square,square,0);
   }
   else if (opPerp) {
      Double_t square = GetHeight()*spec.fSize/1.4;
      if (!fShow) {
         fs1 = Anal1(spec,text+5,length-5);
      } else {
         fs1 = Analyse(x+0.5*square,y,spec,text+5,length-5);
         Double_t x0 = x  + 0.50*square;
         Double_t x1 = x0 - 0.48*square;
         Double_t x2 = x0 + 0.48*square;
         Double_t y1 = y  + 0.6*square;
         Double_t y2 = y1 - 1.3*square;
         DrawLine(x1,y1,x2,y1,spec);
         DrawLine(x0,y1,x0,y2,spec);
      }
      result = fs1;
   }
   else if (opBackslash) {
      Double_t square = GetHeight()*spec.fSize/2;
      if (!fShow) {
         fs1 = Anal1(spec,text+10,length-10);
      } else {
         fs1 = Analyse(x+square,y,spec,text+10,length-10);
         TText bs;
         bs.SetTextFont(GetTextFont());
         bs.SetTextColor(spec.fColor);
         bs.SetTextSize(spec.fSize);
         bs.SetTextAngle(fTextAngle);
         bs.SetTextAlign(11);
         Double_t xx, yy;
         Rotate(gPad, spec.fAngle, x, y, xx, yy);
         bs.PaintText(xx,yy,"\\");
      }
      result = fs1 + TLatexFormSize(square,square,0);
   }
   else if (opParallel) {
      Double_t square = GetHeight()*spec.fSize/1.4;
      if (!fShow) {
         fs1 = Anal1(spec,text+9,length-9);
      } else {
         fs1 = Analyse(x+0.5*square,y,spec,text+9,length-9);
         Double_t x1 = x + 0.15*square;
         Double_t x2 = x + 0.45*square;
         Double_t y1 = y + 0.3*square;
         Double_t y2 = y1- 1.3*square;
         DrawLine(x1,y1,x1,y2,spec);
         DrawLine(x2,y1,x2,y2,spec);
      }
      result = fs1 + TLatexFormSize(square,square,0);
   }
   else if (opGreek>-1) {
      TextSpec_t newSpec = spec;
      newSpec.fFont = fItalic ? 152 : 122;
      char letter = 97 + opGreek;
      Double_t yoffset = 0.; // Greek letter too low
      if (opGreek>25) letter -= 58;
      if (opGreek == 52) letter = '\241'; //varUpsilon
      if (opGreek == 53) letter = '\316'; //epsilon
      if (!fShow) {
         fs1 = Anal1(newSpec,&letter,1);
         fs2 = Anal1(spec,text+strlen(tab[opGreek])+1,length-strlen(tab[opGreek])-1);
         Savefs(&fs1);
      } else {
         fs1 = Readfs();
         Analyse(x+fs1.Width(),y,spec,text+strlen(tab[opGreek])+1,length-strlen(tab[opGreek])-1);
         Analyse(x,y-yoffset,newSpec,&letter,1);
      }
      fs1.AddOver(TLatexFormSize(0,yoffset,0)) ;
      result = fs1+fs2;
   }
 
   else if (opSpec>-1) {
      TextSpec_t newSpec = spec;
      newSpec.fFont = fItalic ? 152 : 122;
      char letter = '\243' + opSpec;
      if(opSpec == 75 || opSpec == 76) {
         newSpec.fFont = GetTextFont();
         if (gVirtualX->InheritsFrom("TGCocoa")) {
            if (opSpec == 75) letter = '\201'; // AA Angstroem
            if (opSpec == 76) letter = '\214'; // aa Angstroem
         } else {
            if (opSpec == 75) letter = '\305'; // AA Angstroem
            if (opSpec == 76) letter = '\345'; // aa Angstroem
         }
      }
      if(opSpec == 80 || opSpec == 81) {
         if (opSpec == 80) letter = '\042'; // #forall
         if (opSpec == 81) letter = '\044'; // #exists
      }
      Double_t props, propi;
      props = 1.8 ; // scale factor for #sum(66)
      propi = 2.3 ; // scale factor for  #int(79)
 
      if (opSpec==66 ) {
         newSpec.fSize = spec.fSize*props;
      } else if (opSpec==79) {
         newSpec.fSize = spec.fSize*propi;
      }
      if (!fShow) {
         fs1 = Anal1(newSpec,&letter,1);
         if (opSpec == 79 || opSpec == 66)
            fs1.Set(fs1.Width(),fs1.Over()*0.45,fs1.Over()*0.45);
 
         fs2 = Anal1(spec,text+strlen(tab2[opSpec])+1,length-strlen(tab2[opSpec])-1);
         Savefs(&fs1);
      } else {
         fs1 = Readfs();
         Analyse(x+fs1.Width(),y,spec,text+strlen(tab2[opSpec])+1,length-strlen(tab2[opSpec])-1);
         if (opSpec!=66 && opSpec!=79)
            Analyse(x,y,newSpec,&letter,1);
         else {
               Analyse(x,y+fs1.Under()/2.,newSpec,&letter,1);
         }
      }
      result = fs1+fs2;
   }
   else if (opAbove>-1) {
      if (!fShow) {
         fs1 = Anal1(spec,text+strlen(tab3[opAbove])+1,length-strlen(tab3[opAbove])-1);
         Savefs(&fs1);
      } else {
         fs1 = Readfs();
         Analyse(x,y,spec,text+strlen(tab3[opAbove])+1,length-strlen(tab3[opAbove])-1);
         Double_t sub = GetHeight()*spec.fSize/14;
         switch(opAbove) {
         case 0: { // bar
            Double_t xx[2], yy[2];
            xx[0] = x; xx[1] = x + fs1.Width();
            yy[0] = yy[1] = y - sub - fs1.Over();
            DrawPolyLine(2, xx, yy, spec, 0.03);
            break;
         }
         case 1: { // vec
            Double_t xx[3], yy[3],
                     dd = GetHeight()*spec.fSize/8, // arrow size
                     midy = y - sub - fs1.Over() - dd; // middle arrow line
            xx[0] = x; xx[1] = x + fs1.Width();
            yy[0] = yy[1] = midy;
            DrawPolyLine(2, xx, yy, spec, 0.03);
            xx[1] = x + fs1.Width(); xx[0] = xx[2] = xx[1] - 2*dd;
            yy[0] = midy - dd; yy[1] = midy; yy[2] = midy + dd;
            DrawPolyLine(3, xx, yy, spec, 0.03);
            break;
         }
         case 2: { // dot
            Double_t dd = std::max(0.5*GetLineWidth(), 0.5*sub), // dot size
                     midx = x + fs1.Width()/2,
                     midy = y - sub - fs1.Over() - dd;
            Double_t xx[5] = { midx - dd, midx - dd, midx + dd, midx + dd, midx - dd },
                     yy[5] = { midy + dd, midy - dd, midy - dd, midy + dd, midy + dd };
            DrawPolyLine(5, xx, yy, spec, 10.);
            break;
         }
         case 3: { // hat
            Double_t xx[3], yy[3];
            xx[1] = x + fs1.Width()/2;
            xx[0] = xx[1] - fs1.Width()/3;
            xx[2] = xx[1] + fs1.Width()/3;
            yy[0] = y - sub - fs1.Over();
            yy[1] = yy[0] - 2*sub;
            yy[2] = yy[0];
            DrawPolyLine(3, xx, yy, spec, 0.03);
            break;
         }
         case 4: { // ddot
            Double_t dd = std::max(0.5*GetLineWidth(), 0.5*sub), // dot size
                     midx = x + fs1.Width()/2 - 1.5*sub,
                     midy = y - sub - fs1.Over() - dd;
            Double_t xx1[5] = { midx - dd, midx - dd, midx + dd, midx + dd, midx - dd },
                     yy1[5] = { midy + dd, midy - dd, midy - dd, midy + dd, midy + dd };
            DrawPolyLine(5, xx1, yy1, spec, 10.);
            midx = x + fs1.Width()/2 + 1.5*sub;
            Double_t xx2[5] = { midx - dd, midx - dd, midx + dd, midx + dd, midx - dd },
                     yy2[5] = { midy + dd, midy - dd, midy - dd, midy + dd, midy + dd };
            DrawPolyLine(5, xx2, yy2, spec, 10.);
            break;
         }
         case 5: { // acute
            Double_t xx[2], yy[2];
            xx[0] = x + fs1.Width()/2; xx[1] = xx[0] + 3*sub;
            yy[0] = y - sub - fs1.Over();
            yy[1] = yy[0] - 2.5*sub;
            DrawPolyLine(2, xx, yy, spec, 0.03);
            break;
         }
         case 6: { // grave
            Double_t xx[2], yy[2];
            xx[0] = x + fs1.Width()/2 + sub; xx[1] = xx[0] - 2*sub;
            yy[0] = y - sub - fs1.Over();
            yy[1] = yy[0] - 2*sub;
            DrawPolyLine(2, xx, yy, spec, 0.03);
            break;
         }
         case 7: { // check
            Double_t xx[3], yy[3];
            xx[1] = x+fs1.Width()/2; xx[0] = xx[1] - 2*sub; xx[2] = xx[1] + 2*sub;
            yy[1] = y - sub - fs1.Over();
            yy[0] = yy[2] = yy[1] - 2*sub;
            DrawPolyLine(3, xx, yy, spec, 0.03);
            break;
         }
         case 8: { // tilde
            Double_t x2 = x+fs1.Width()/2, y2 = y -fs1.Over();
            // tilde must be drawn separately on screen and on PostScript
            // because an adjustment is required along Y for PostScript.
            TVirtualPS *saveps = gVirtualPS;
            if (gVirtualPS) gVirtualPS = nullptr;
            Double_t y22 = y2;
            if (gVirtualX->InheritsFrom("TGCocoa")) y2 -= 4.7*sub;
            Double_t xx, yy;
            Rotate(gPad, spec.fAngle, x2, y2, xx, yy);
            TText tilde;
            tilde.SetTextFont(fTextFont);
            tilde.SetTextColor(spec.fColor);
            tilde.SetTextSize(0.9*spec.fSize);
            tilde.SetTextAlign(22);
            tilde.SetTextAngle(fTextAngle);
            tilde.PaintText(xx,yy,"~");
            if (saveps) {
               gVirtualPS = saveps;
               if (!strstr(gVirtualPS->GetTitle(),"IMG")) y22 -= 4*sub;
               Rotate(gPad, spec.fAngle, x2, y22, xx, yy);
               gVirtualPS->SetTextAlign(22);
               gVirtualPS->Text(xx, yy, "~");
            }
            break;
         }
         case 9: { // slash
            Double_t xx[2], yy[2];
            xx[0] = x + 0.8*fs1.Width();
            yy[0] = y - fs1.Over() - sub;
            xx[1] = x + 0.3*fs1.Width();
            yy[1] = yy[0] + fs1.Height() + 2*sub;
            DrawPolyLine(2, xx, yy, spec, 0.03);
            break;
         }
         }
      }
      Double_t div = 3;
      if (opAbove==1) div=4;
      result.Set(fs1.Width(),fs1.Over()+GetHeight()*spec.fSize/div,fs1.Under());
   }
   else if (opSquareBracket) { // operator #[]{arg}
      Double_t l = GetHeight()*spec.fSize/4;
      Double_t l2 = l/2 ;
      if (!fShow) {
         fs1 = Anal1(spec,text+3,length-3);
         Savefs(&fs1);
      } else {
         fs1 = Readfs();
         Analyse(x+l2+l,y,spec,text+3,length-3);
         DrawLine(x+l2,y-fs1.Over(),x+l2,y+fs1.Under(),spec);
         DrawLine(x+l2,y-fs1.Over(),x+l2+l,y-fs1.Over(),spec);
         DrawLine(x+l2,y+fs1.Under(),x+l2+l,y+fs1.Under(),spec);
         DrawLine(x+l2+fs1.Width()+2*l,y-fs1.Over(),x+l2+fs1.Width()+2*l,y+fs1.Under(),spec);
         DrawLine(x+l2+fs1.Width()+2*l,y-fs1.Over(),x+l2+fs1.Width()+l,y-fs1.Over(),spec);
         DrawLine(x+l2+fs1.Width()+2*l,y+fs1.Under(),x+l2+fs1.Width()+l,y+fs1.Under(),spec);
      }
      result.Set(fs1.Width()+3*l,fs1.Over(),fs1.Under());
   }
   else if (opParen) {  // operator #(){arg}
      Double_t l = GetHeight()*spec.fSize/4;
      Double_t radius2,radius1 , dw, l2 = l/2 ;
      Double_t angle = 35 ;
      if (!fShow) {
         fs1 = Anal1(spec,text+3,length-3);
         Savefs(&fs1);
         radius2 = fs1.Height() ;
         radius1 = radius2  * 2 / 3;
         dw = radius1*(1 - TMath::Cos(kPI*angle/180)) ;
      } else {
         fs1 = Readfs();
         radius2 = fs1.Height();
         radius1 = radius2  * 2 / 3;
         dw = radius1*(1 - TMath::Cos(kPI*angle/180)) ;
         Double_t x1 = x+l2+radius1 ;
         Double_t x2 = x+5*l2+2*dw+fs1.Width()-radius1 ;
         Double_t y1 = y - (fs1.Over() - fs1.Under())/2. ;
         DrawParenthesis(x1,y1,radius1,radius2,180-angle,180+angle,spec) ;
         DrawParenthesis(x2,y1,radius1,radius2,360-angle,360+angle,spec) ;
         Analyse(x+3*l2+dw,y,spec,text+3,length-3);
      }
     // result = TLatexFormSize(fs1.Width()+3*l,fs1.Over(),fs1.Under());
      result.Set(fs1.Width()+3*l+2*dw,fs1.Over(),fs1.Under());
   }
   else if (opAbs) {  // operator #||{arg}
      Double_t l = GetHeight()*spec.fSize/4;
      Double_t l2 = l/2 ;
      if (!fShow) {
         fs1 = Anal1(spec,text+3,length-3);
         Savefs(&fs1);
      } else {
         fs1 = Readfs();
         Analyse(x+l2+l,y,spec,text+3,length-3);
         DrawLine(x+l2,y-fs1.Over(),x+l2,y+fs1.Under(),spec);
         DrawLine(x+l2+fs1.Width()+2*l,y-fs1.Over(),x+l2+fs1.Width()+2*l,y+fs1.Under(),spec);
      }
      result.Set(fs1.Width()+3*l,fs1.Over(),fs1.Under());
   }
   else if (opBigCurly) { // big curly bracket  #{}{arg}
      Double_t l = GetHeight()*spec.fSize/4;
      Double_t l2 = l/2 ;
      Double_t l8 , ltip;
 
      if (!fShow) {
         fs1 = Anal1(spec,text+3,length-3);
         l8 = fs1.Height()/8 ;
         ltip = TMath::Min(l8,l) ;
         l = ltip ;
         Savefs(&fs1);
      } else {
         fs1 = Readfs();
         Double_t y2 = y + (fs1.Under()-fs1.Over())/2 ;
         l8 = fs1.Height()/8 ;
         ltip = TMath::Min(l8,l) ;
         l = ltip ;
         Analyse(x+l+ltip+l2,y,spec,text+3,length-3);
         // Draw open curly bracket
         // Vertical lines
         DrawLine(x+l2+ltip,y-fs1.Over(),x+l2+ltip,y2-ltip,spec);
         DrawLine(x+l2+ltip,y2+ltip,x+l2+ltip,y+fs1.Under(),spec);
         // top and bottom lines
         DrawLine(x+l2+ltip,y-fs1.Over(),x+l2+ltip+l,y-fs1.Over(),spec);
         DrawLine(x+l2+ltip,y+fs1.Under(),x+l2+ltip+l,y+fs1.Under(),spec);
         // < sign
         DrawLine(x+l2,y2,x+l2+ltip,y2-ltip,spec);
         DrawLine(x+l2,y2,x+l2+ltip,y2+ltip,spec);
 
         // Draw close curly bracket
         // vertical lines
         DrawLine(x+l2+ltip+fs1.Width()+2*l,y-fs1.Over(),x+l2+ltip+fs1.Width()+2*l,y2-ltip,spec);
         DrawLine(x+l2+ltip+fs1.Width()+2*l,y2+ltip,x+l2+ltip+fs1.Width()+2*l,y+fs1.Under(),spec);
         // Top and bottom lines
         DrawLine(x+l2+fs1.Width()+l+ltip,y-fs1.Over(),x+l2+ltip+fs1.Width()+2*l,y-fs1.Over(),spec);
         DrawLine(x+l2+fs1.Width()+l+ltip,y+fs1.Under(),x+l2+ltip+fs1.Width()+2*l,y+fs1.Under(),spec);
         // > sign
         DrawLine(x+l2+ltip+2*l+fs1.Width(),y2-ltip,x+l2+2*l+2*ltip+fs1.Width(),y2,spec);
         DrawLine(x+l2+ltip+2*l+fs1.Width(),y2+ltip,x+l2+2*l+2*ltip+fs1.Width(),y2,spec);
      }
      result.Set(fs1.Width()+3*l+2*ltip,fs1.Over(),fs1.Under());
   }
   else if (opFrac>-1) { // \frac found
      if (opCurlyCurly==-1) { // }{ not found
         // arguments missing for \frac
         fError = "Missing denominator for #frac";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      Double_t height = GetHeight()*spec.fSize/8;
      if (!fShow) {
         fs1 = Anal1(spec,text+opFrac+6,opCurlyCurly-opFrac-6);
         fs2 = Anal1(spec,text+opCurlyCurly+2,length-opCurlyCurly-3);
         Savefs(&fs1);
         Savefs(&fs2);
      } else {
         fs2 = Readfs();
         fs1 = Readfs();
         Double_t addW1,addW2;
         if (fs1.Width()<fs2.Width()) {
            addW1 = (fs2.Width()-fs1.Width())/2;
            addW2 = 0;
         } else {
            addW1 = 0;
            addW2 = (fs1.Width()-fs2.Width())/2;
         }
         Analyse(x+addW2,y+fs2.Over()-height,spec,text+opCurlyCurly+2,length-opCurlyCurly-3);  // denominator
         Analyse(x+addW1,y-fs1.Under()-3*height,spec,text+opFrac+6,opCurlyCurly-opFrac-6); //numerator
 
         DrawLine(x,y-2*height,x+std::max(fs1.Width(),fs2.Width()),y-2*height,spec);
      }
 
      result.Set(std::max(fs1.Width(),fs2.Width()),fs1.Height()+3*height,fs2.Height()-height);
 
   }
   else if (opSplitLine>-1) { // \splitline found
      if (opCurlyCurly==-1) { // }{ not found
         // arguments missing for \splitline
         fError = "Missing second line for #splitline";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      Double_t height = GetHeight()*spec.fSize/8;
      if (!fShow) {
         fs1 = Anal1(spec,text+opSplitLine+11,opCurlyCurly-opSplitLine-11);
         fs2 = Anal1(spec,text+opCurlyCurly+2,length-opCurlyCurly-3);
         Savefs(&fs1);
         Savefs(&fs2);
      } else {
         fs2 = Readfs();
         fs1 = Readfs();
         Analyse(x,y+fs2.Over()-height,spec,text+opCurlyCurly+2,length-opCurlyCurly-3);  // second line
         Analyse(x,y-fs1.Under()-3*height,spec,text+opSplitLine+11,opCurlyCurly-opSplitLine-11); //first line
      }
 
      result.Set(std::max(fs1.Width(),fs2.Width()),fs1.Height()+3*height,fs2.Height()-height);
 
   }
   else if (opSqrt>-1) { // \sqrt found
      if (!fShow) {
         if (opSquareCurly>-1) {
            // power nth  #sqrt[n]{arg}
            fs1 = Anal1(specNewSize,text+opSqrt+6,opSquareCurly-opSqrt-6);
            fs2 = Anal1(spec,text+opSquareCurly+1,length-opSquareCurly-1);
            Savefs(&fs1);
            Savefs(&fs2);
            result.Set(fs2.Width()+ GetHeight()*spec.fSize/10+std::max(GetHeight()*spec.fSize/2,(Double_t)fs1.Width()),
                       fs2.Over()+fs1.Height()+GetHeight()*spec.fSize/4,fs2.Under());
         } else {
            fs1 = Anal1(spec,text+opSqrt+5,length-opSqrt-5);
            Savefs(&fs1);
            result.Set(fs1.Width()+GetHeight()*spec.fSize/2,fs1.Over()+GetHeight()*spec.fSize/4,fs1.Under());
         }
      } else {
         if (opSquareCurly>-1) { // ]{
            fs2 = Readfs();
            fs1 = Readfs();
            Double_t pas = std::max(GetHeight()*spec.fSize/2,(Double_t)fs1.Width());
            Double_t pas2 = pas + GetHeight()*spec.fSize/10;
            Double_t y1 = y-fs2.Over() ;
            Double_t y2 = y+fs2.Under() ;
            Double_t y3 = y1-GetHeight()*spec.fSize/4;
            Analyse(x+pas2,y,spec,text+opSquareCurly+1,length-opSquareCurly-1);
            Analyse(x,y-fs2.Over()-fs1.Under(),specNewSize,text+opSqrt+6,opSquareCurly-opSqrt-6); // indice
            DrawLine(x,y1,x+pas,y2,spec);
            DrawLine(x+pas,y2,x+pas,y3,spec);
            DrawLine(x+pas,y3,x+pas2+fs2.Width(),y3,spec);
         } else {
            fs1 = Readfs();
            Double_t x1 = x+GetHeight()*spec.fSize*2/5 ;
            Double_t x2 = x+GetHeight()*spec.fSize/2+fs1.Width() ;
            Double_t y1 = y-fs1.Over() ;
            Double_t y2 = y+fs1.Under() ;
            Double_t y3 = y1-GetHeight()*spec.fSize/4;
 
            Analyse(x+GetHeight()*spec.fSize/2,y,spec,text+opSqrt+6,length-opSqrt-7);
 
            Short_t lineW = GetLineWidth();
            SetLineWidth(1);
            Double_t dx = (y2-y3)/8;
            UInt_t a,d;
            GetTextAscentDescent(a, d, text);
            if (a>12) SetLineWidth(std::max(2,(Int_t)(dx/2)));
            DrawLine(x1-2*dx,y1,x1-dx,y2,spec);
            if (a>12) SetLineWidth(std::max(1,(Int_t)(dx/4)));
            DrawLine(x1-dx,y2,x1,y3,spec);
            DrawLine(x1,y3,x2,y3,spec);
            SetLineWidth(lineW);
         }
      }
   }
   else if (opColor>-1) { // \color found
      if (opSquareCurly==-1) {
         // color number is not specified
         fError = "Missing color number. Syntax is #color[(Int_t)nb]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      TextSpec_t newSpec = spec;
      Char_t *nb = new Char_t[opSquareCurly-opColor-6];
      strncpy(nb,text+opColor+7,opSquareCurly-opColor-7);
      nb[opSquareCurly-opColor-7] = 0;
      if (sscanf(nb,"%d",&newSpec.fColor) < 1) {
         delete[] nb;
         // color number is invalid
         fError = "Invalid color number. Syntax is #color[(Int_t)nb]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      delete[] nb;
      if (!fShow) {
         result = Anal1(newSpec,text+opSquareCurly+1,length-opSquareCurly-1);
      } else {
         Analyse(x,y,newSpec,text+opSquareCurly+1,length-opSquareCurly-1);
      }
   }
   else if (opUrl>-1) { // \url found
      if (opSquareCurly==-1) {
         // url is not specified
         fError = "Missing url. Syntax is #url[http://...]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      TextSpec_t newSpec = spec;
      Char_t *url = new Char_t[opSquareCurly-opUrl-4];
      strncpy(url,text+opUrl+5,opSquareCurly-opUrl-5);
      fName = url;
      delete[] url;
      if (!fShow) {
         result = Anal1(newSpec,text+opSquareCurly+1,length-opSquareCurly-1);
      } else {
         Analyse(x,y,newSpec,text+opSquareCurly+1,length-opSquareCurly-1);
      }
      fName = "";
   }
   else if (opFont>-1) { // \font found
      if (opSquareCurly==-1) {
         // font number is not specified
         fError = "Missing font number. Syntax is #font[nb]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      TextSpec_t newSpec = spec;
      Char_t *nb = new Char_t[opSquareCurly-opFont-5];
      strncpy(nb,text+opFont+6,opSquareCurly-opFont-6);
      nb[opSquareCurly-opFont-6] = 0;
      if (sscanf(nb,"%d",&newSpec.fFont) < 1) {
         delete[] nb;
         // font number is invalid
         fError = "Invalid font number. Syntax is #font[(Int_t)nb]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      delete[] nb;
      if (!fShow) {
         result = Anal1(newSpec,text+opSquareCurly+1,length-opSquareCurly-1);
      } else {
         Analyse(x,y,newSpec,text+opSquareCurly+1,length-opSquareCurly-1);
      }
   }
   else if (opKern>-1) { // #kern found
      if (opSquareCurly==-1) {
         // horizontal shift is not specified
         fError = "Missing horizontal shift number. Syntax is #kern[dx]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      Char_t *dxc = new Char_t[opSquareCurly-opKern-5];
      strncpy(dxc,text+opKern+6,opSquareCurly-opKern-6);
      dxc[opSquareCurly-opKern-6] = 0;
      Float_t dx = 0;
      if (sscanf(dxc,"%f",&dx) < 1) {
         delete[] dxc;
         // horizontal shift number is invalid
         fError = "Invalid horizontal shift number. Syntax is #kern[(Float_t)dx]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      delete[] dxc;
      if (!fShow) {
         fs1 = Anal1(spec,text+opSquareCurly+1,length-opSquareCurly-1);
         Savefs(&fs1);
         Double_t ddx = dx * fs1.Width();
         result = TLatexFormSize(fs1.Width() + ddx, fs1.Over(), fs1.Under());
      } else {
         fs1 = Readfs();
         Double_t ddx = dx * fs1.Width();
         Analyse(x + ddx,y,spec,text+opSquareCurly+1,length-opSquareCurly-1);
      }
   }
   else if (opLower>-1) { // #lower found
      if (opSquareCurly==-1) {
         // vertical shift is not specified
         fError = "Missing vertical shift number. Syntax is #lower[dy]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      Char_t *dyc = new Char_t[opSquareCurly-opLower-6];
      strncpy(dyc,text+opLower+7,opSquareCurly-opLower-7);
      dyc[opSquareCurly-opLower-7] = 0;
      Float_t dy = 0;
      if (sscanf(dyc,"%f",&dy) < 1) {
         delete[] dyc;
         // vertical shift number is invalid
         fError = "Invalid vertical shift number. Syntax is #lower[(Float_t)dy]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      delete[] dyc;
      if (!fShow) {
         fs1 = Anal1(spec,text+opSquareCurly+1,length-opSquareCurly-1);
         Savefs(&fs1);
         Double_t ddy = dy * (fs1.Over() + fs1.Under());
         result = TLatexFormSize(fs1.Width(), fs1.Over() + ddy, fs1.Under() + ddy);
      } else {
         fs1 = Readfs();
         Double_t ddy = dy * (fs1.Over() + fs1.Under());
         Analyse(x,y + ddy,spec,text+opSquareCurly+1,length-opSquareCurly-1);
      }
   }
   else if (opScale>-1) { // \scale found
      if (opSquareCurly==-1) {
         // scale factor is not specified
         fError = "Missing scale factor. Syntax is #scale[(Double_t)nb]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      TextSpec_t newSpec = spec;
      Char_t *nb = new Char_t[opSquareCurly-opScale-6];
      strncpy(nb,text+opScale+7,opSquareCurly-opScale-7);
      nb[opSquareCurly-opScale-7] = 0;
      if (sscanf(nb,"%lf",&newSpec.fSize) < 1) {
         delete[] nb;
         // scale factor is invalid
         fError = "Invalid scale factor. Syntax is #factor[(Double_t)nb]{ ... }";
         delete[] text;
         return TLatexFormSize(0,0,0);
      }
      newSpec.fSize *= spec.fSize;
      delete[] nb;
      if (!fShow) {
         result = Anal1(newSpec,text+opSquareCurly+1,length-opSquareCurly-1);
      } else {
         Analyse(x,y,newSpec,text+opSquareCurly+1,length-opSquareCurly-1);
      }
   }
   else if (opBf>-1) { // operator #bf{arg}
      TextSpec_t newSpec = spec;
      Int_t lut[] = {3, 13, 1, 6, 7, 4, 5, 10, 11, 8, 9, 12, 2, 14, 15};
      Int_t fontId = (newSpec.fFont/10);
      if ((fontId >= 1) && (fontId <= (Int_t)(sizeof(lut)/sizeof(lut[0])))) fontId = lut[fontId-1];
      newSpec.fFont = fontId*10 + newSpec.fFont%10;
      if (!fShow) {
         fs1 = Anal1(newSpec,text+3,length-3);
         Savefs(&fs1);
      } else {
         fs1 = Readfs();
         Analyse(x,y,newSpec,text+3,length-3);
      }
      result = fs1;
   }
   else if (opMbox>-1) { // dummy operator #mbox{arg}
      TextSpec_t newSpec = spec;
      if (!fShow) {
         fs1 = Anal1(newSpec,text+5,length-5);
         Savefs(&fs1);
      } else {
         fs1 = Readfs();
         Analyse(x,y,newSpec,text+5,length-5);
      }
      result = fs1;
   }
   else if (opIt>-1) { // operator #it{arg}
      TextSpec_t newSpec = spec;
      Int_t lut[] = {13, 3, 2, 5, 4, 7, 6, 9, 8, 11, 10, 15, 1, 14, 12};
      Int_t fontId = (newSpec.fFont/10);
      if ((fontId >= 1) && (fontId <= (Int_t)(sizeof(lut)/sizeof(lut[0])))) fontId = lut[fontId-1];
      newSpec.fFont = fontId*10 + newSpec.fFont%10;
      fItalic = !fItalic;
      if (!fShow) {
         fs1 = Anal1(newSpec,text+3,length-3);
         Savefs(&fs1);
      } else {
         fs1 = Readfs();
         Analyse(x,y,newSpec,text+3,length-3);
      }
      fItalic = !fItalic;
      result = fs1;
   }
   else { // no operators found, it is a character string
      SetTextSize(spec.fSize);
      SetTextAngle(spec.fAngle);
      SetTextColor(spec.fColor);
      SetTextFont(spec.fFont);
      SetTextAlign(11);
      TAttText::Modify();
      UInt_t w=0,h=0;
 
      Int_t leng = strlen(text) ;
 
      quote1 = quote2 = kFALSE ;
      Char_t *p ;
      for (i=0 ; i<leng ; i++) {
         switch (text[i]) {
            case '\'' : quote1 = !quote1 ; break ; // single quote symbol not correctly interpreted when PostScript
            case '"'  : quote2 = !quote2 ;  break ;
         }
         //if (quote1 || quote2) continue ;
         if (text[i] == '@') {  // @ symbol not correctly interpreted when PostScript
            p = &text[i] ;
            if ( *(p+1) == '{' || *(p+1) == '}' || *(p+1) == '[' || *(p+1) == ']') {
               while (*p != 0) {
                  *p = *(p+1) ; p++ ;
               }
               leng-- ;
            }
         }
      }
      text[leng] = 0 ;
 
      if (fShow) {
         // paint the Latex sub-expression per sub-expression
         Double_t xx, yy;
         Rotate(gPad, spec.fAngle, x, y, xx, yy);
         if (fName.Length() > 0) gPad->PaintTextUrl(xx, yy, text, fName.Data());
         else                    gPad->PaintText(xx, yy, text);
      } else {
         GetTextExtent(w,h,text);
         Double_t width = w;
         UInt_t a,d;
         GetTextAscentDescent(a, d, text);
         fs1.Set(width,a,d);
      }
 
      result = fs1;
   }
 
   delete[] text;
 
   return result;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Make a copy of this object with the new parameters
/// And copy object attributes
 
TLatex *TLatex::DrawLatex(Double_t x, Double_t y, const char *text)
{
   TLatex *newtext = new TLatex(x, y, text);
   TAttText::Copy(*newtext);
   TAttLine::Copy(*newtext);
   newtext->SetBit(kCanDelete);
   if (TestBit(kTextNDC)) newtext->SetNDC();
   newtext->AppendPad();
   return newtext;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Draw this TLatex with new coordinates in NDC.
 
TLatex *TLatex::DrawLatexNDC(Double_t x, Double_t y, const char *text)
{
   TLatex *newtext = DrawLatex(x, y, text);
   newtext->SetNDC();
   return newtext;
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Draw a poly line in a Latex formula
/// Is scale_width parameter >=1, fill area will be drawn
/// Otherwise line width will be scaled proportional to current font size
/// If not specified - default line width will be used
void TLatex::DrawPolyLine(Int_t npoints, Double_t *xx, Double_t *yy, const TextSpec_t &spec, Double_t scale_width)
{
   if (!gPad)
      return;
 
   Rotate(gPad, spec.fAngle, npoints, xx, yy);
 
   if (scale_width >= 1.) {
      TAttFill fill(spec.fColor, 1001);
      fill.Modify();
      gPad->PaintFillArea(npoints, xx, yy, "f");
      return;
   }
 
   auto prevWidth = GetLineWidth();
   if (scale_width) {
      Int_t lineWidth = TMath::Nint(GetHeight() * spec.fSize * scale_width);
      SetLineWidth(lineWidth > prevWidth ? lineWidth : prevWidth);
   }
 
   SetLineColor(spec.fColor);
   TAttLine::Modify();
 
   gPad->PaintPolyLine(npoints, xx, yy);
   if (scale_width)
      SetLineWidth(prevWidth);
}
 
 
////////////////////////////////////////////////////////////////////////////////
/// Draw a line in a Latex formula
 
void TLatex::DrawLine(Double_t x1, Double_t y1, Double_t x2, Double_t y2, const TextSpec_t &spec)
{
   if (!gPad) return;
   Double_t xx[2] = { x1, x2 };
   Double_t yy[2] = { y1, y2 };
   Rotate(gPad, spec.fAngle, 2, xx, yy);
   SetLineColor(spec.fColor);
   TAttLine::Modify();
   gPad->PaintLine(xx[0], yy[0], xx[1], yy[1]);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Draw an arc of ellipse in a Latex formula (right or left parenthesis)
 
void TLatex::DrawCircle(Double_t x1, Double_t y1, Double_t r, const TextSpec_t &spec)
{
   if (!gPad)
      return;
   if (r < 1)
      r = 1;
 
   const Int_t np = 40;
   Double_t dphi = 2*kPI/np;
   Double_t x[np+3], y[np+3];
 
   SetLineColor(spec.fColor);
   TAttLine::Modify();  //Change line attributes only if necessary
 
   for (Int_t i = 0; i <= np; i++) {
      Double_t angle = i*dphi;
      x[i] = x1 + r*TMath::Cos(angle);
      y[i] = y1 + r*TMath::Sin(angle);
   }
   Rotate(gPad, spec.fAngle, np+1, x, y);
 
   gPad->PaintPolyLine(np+1, x, y);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Draw an arc of ellipse in a Latex formula (right or left parenthesis)
 
void TLatex::DrawParenthesis(Double_t x1, Double_t y1, Double_t r1, Double_t r2,
                             Double_t  phimin, Double_t  phimax, const TextSpec_t &spec)
{
   if (!gPad)
      return;
   if (r1 < 1)
      r1 = 1;
   if (r2 < 1)
      r2 = 1;
 
   const Int_t np = 40;
   Double_t dphi = (phimax-phimin)*kPI/(180*np);
   Double_t x[np+3], y[np+3];
 
   SetLineColor(spec.fColor);
   TAttLine::Modify();  //Change line attributes only if necessary
 
   for (Int_t i = 0; i <= np; i++) {
      Double_t angle = phimin*kPI/180 + i*dphi;
      x[i] = x1 + r1*TMath::Cos(angle);
      y[i] = y1 + r2*TMath::Sin(angle);
   }
 
   Rotate(gPad, spec.fAngle, np+1, x, y);
 
   gPad->PaintPolyLine(np+1,x,y);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Paint.
 
void TLatex::Paint(Option_t *)
{
   if (!gPad) return ;
   Double_t xsave = fX;
   Double_t ysave = fY;
   if (TestBit(kTextNDC)) {
      fX = gPad->GetX1() + xsave*(gPad->GetX2() - gPad->GetX1());
      fY = gPad->GetY1() + ysave*(gPad->GetY2() - gPad->GetY1());
      PaintLatex(fX,fY,GetTextAngle(),GetTextSize(),GetTitle());
   } else {
      PaintLatex(gPad->XtoPad(fX),gPad->YtoPad(fY),GetTextAngle(),GetTextSize(),GetTitle());
   }
   fX = xsave;
   fY = ysave;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Main drawing function
///
/// Warning: Unlike most others "XYZ::PaintXYZ" methods, PaintLatex modifies
///          the TLatex data members.
 
void TLatex::PaintLatex(Double_t x, Double_t y, Double_t angle, Double_t size, const Char_t *text1)
{
   if (size<=0 || strlen(text1) <= 0) return; // do not paint empty text or text with size <= 0
 
   TAttText::Modify();  // Change text attributes only if necessary.
 
   TVirtualPS *saveps = gVirtualPS;
 
   if (gVirtualPS) {
      if (gVirtualPS->InheritsFrom("TTeXDump")) {
         gVirtualPS->SetTextAngle(angle);
         TString t(text1);
         if (t.Index("#")>=0 || t.Index("^")>=0 || t.Index("\\")>=0) {
            t.ReplaceAll("#LT","\\langle");
            t.ReplaceAll("#GT","\\rangle");
            t.ReplaceAll("#club","\\clubsuit");
            t.ReplaceAll("#spade","\\spadesuit");
            t.ReplaceAll("#heart","\\heartsuit");
            t.ReplaceAll("#diamond","\\diamondsuit");
            t.ReplaceAll("#voidn","\\wp");
            t.ReplaceAll("#voidb","f");
            t.ReplaceAll("#ocopyright","\\copyright");
            t.ReplaceAll("#trademark","TM");
            t.ReplaceAll("#void3","TM");
            t.ReplaceAll("#oright","R");
            t.ReplaceAll("#void1","R");
            t.ReplaceAll("#3dots","\\ldots");
            t.ReplaceAll("#lbar","\\mid");
            t.ReplaceAll("#bar","\\wwbar");
            t.ReplaceAll("#void8","\\mid");
            t.ReplaceAll("#divide","\\div");
            t.ReplaceAll("#Jgothic","\\Im");
            t.ReplaceAll("#Rgothic","\\Re");
            t.ReplaceAll("#doublequote","\"");
            t.ReplaceAll("#plus","+");
            t.ReplaceAll("#minus","-");
            t.ReplaceAll("#/","/");
            t.ReplaceAll("#upoint",".");
            t.ReplaceAll("#aa","\\mbox{\\aa}");
            t.ReplaceAll("#AA","\\mbox{\\AA}");
 
            t.ReplaceAll("#omicron","o");
            t.ReplaceAll("#Alpha","A");
            t.ReplaceAll("#Beta","B");
            t.ReplaceAll("#Epsilon","E");
            t.ReplaceAll("#Zeta","Z");
            t.ReplaceAll("#Eta","H");
            t.ReplaceAll("#Iota","I");
            t.ReplaceAll("#Kappa","K");
            t.ReplaceAll("#Mu","M");
            t.ReplaceAll("#Nu","N");
            t.ReplaceAll("#Omicron","O");
            t.ReplaceAll("#Rho","P");
            t.ReplaceAll("#Tau","T");
            t.ReplaceAll("#Chi","X");
            t.ReplaceAll("#varomega","\\varpi");
 
            t.ReplaceAll("#varUpsilon","?");
            t.ReplaceAll("#corner","?");
            t.ReplaceAll("#ltbar","?");
            t.ReplaceAll("#bottombar","?");
            t.ReplaceAll("#notsubset","?");
            t.ReplaceAll("#arcbottom","?");
            t.ReplaceAll("#cbar","?");
            t.ReplaceAll("#arctop","?");
            t.ReplaceAll("#topbar","?");
            t.ReplaceAll("#arcbar","?");
            t.ReplaceAll("#downleftarrow","?");
            t.ReplaceAll("#splitline","\\genfrac{}{}{0pt}{}");
 
            t.ReplaceAll("#","\\");
            t.ReplaceAll("%","\\%");
         }
         gVirtualPS->Text(x,y,t.Data());
      } else {
         Bool_t saveb = gPad->IsBatch();
         gPad->SetBatch(kTRUE);
         if (!PaintLatex1( x, y, angle, size, text1)) {
            if (saveps) gVirtualPS = saveps;
            return;
         }
         gPad->SetBatch(saveb);
      }
      gVirtualPS = nullptr;
   }
 
   if (!gPad->IsBatch()) PaintLatex1( x, y, angle, size, text1);
   if (saveps) gVirtualPS = saveps;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Drawing function
 
Int_t TLatex::PaintLatex1(Double_t x, Double_t y, Double_t angle, Double_t size, const Char_t *text1)
{
   if (!gPad)
      return 0;
   TString newText = text1;
   if(newText.Length() == 0)
      return 0;
   newText.ReplaceAll("#hbox","#mbox");
 
   fError = nullptr;
   if (CheckLatexSyntax(newText)) {
      Error("PaintLatex1", "%s\n==> %s", fError, text1);
      return 0;
   }
   fError = nullptr;
 
   // Do not use Latex if font is low precision.
   if (fTextFont % 10 < 2) {
      if (gVirtualX) gVirtualX->SetTextAngle(angle);
      if (gVirtualPS) gVirtualPS->SetTextAngle(angle);
      gPad->PaintText(x,y,text1);
      return 1;
   }
 
   Bool_t saveb = gPad->IsBatch();
   // Paint the text using TMathText if contains a "\"
   if (strstr(text1,"\\")) {
      TMathText tm;
      tm.SetTextAlign(GetTextAlign());
      tm.SetTextFont(GetTextFont());
      tm.SetTextColor(GetTextColor());
      tm.PaintMathText(x, y, angle, size, text1);
      // If PDF, paint using TLatex
      if (gVirtualPS) {
         if (gVirtualPS->InheritsFrom("TPDF") ||
             gVirtualPS->InheritsFrom("TSVG")) {
            newText.ReplaceAll("\\","#");
            gPad->SetBatch(kTRUE);
         } else {
            return 1;
         }
      } else {
         return 1;
      }
   }
 
   Double_t saveSize = size;
   Int_t saveFont = fTextFont;
   if (fTextFont % 10 > 2) {
      size = GetTextSizePercent(size);
      SetTextFont(10*(saveFont/10) + 2);
   }
 
   Int_t length = newText.Length();
   const Char_t *text = newText.Data();
 
   Double_t xsave = fX;
   Double_t ysave = fY;
   fX = x;
   fY = y;
   gPad->XYtoAbsPixel(fX, fY, x, y);
   fShow = kFALSE;
   TLatexFormSize fs = FirstParse(angle,size,text);
 
   fOriginSize = size;
 
   // Get current line attributes.
   Short_t lineW = GetLineWidth();
   Int_t lineC = GetLineColor();
 
   TextSpec_t spec;
   spec.fAngle = angle;
   spec.fSize  = size;
   spec.fColor = GetTextColor();
   spec.fFont  = GetTextFont();
   Short_t halign = fTextAlign/10;
   Short_t valign = fTextAlign - 10*halign;
   TextSpec_t newSpec = spec;
   if (fError) {
      Error("PaintLatex1", "%s\n==> %s", fError, text);
   } else {
      fShow = kTRUE;
      newSpec.fSize = size;
 
      switch (valign) {
         case 0: y -= fs.Under(); break;
         case 1: break;
         case 2: y += fs.Height()*0.5-fs.Under() + 1.; break;
         case 3: y += fs.Over(); break;
      }
      switch (halign) {
         case 2: x -= fs.Width()/2; break;
         case 3: x -= fs.Width(); break;
      }
      Analyse(x,y,newSpec,text,length);
   }
 
   gPad->SetBatch(saveb);
   SetTextSize(saveSize);
   SetTextAngle(angle);
   SetTextFont(saveFont);
   SetTextColor(spec.fColor);
   SetTextAlign(valign+10*halign);
   SetLineWidth(lineW);
   SetLineColor(lineC);
   fTabSize.clear();
   fX = xsave;
   fY = ysave;
   return fError ? 0 : 1;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Check if the Latex syntax is correct
 
Int_t TLatex::CheckLatexSyntax(TString &text)
{
   const Char_t *kWord1[] = {"{}^{","{}_{","^{","_{","#scale{","#color{","#url{","#font{","#sqrt{","#[]{","#{}{","#||{",
                       "#bar{","#vec{","#dot{","#hat{","#ddot{","#acute{","#grave{","#check{","#tilde{","#slash{","#bf{","#it{","#mbox{",
                       "\\scale{","\\color{","\\font{","\\sqrt{","\\[]{","\\{}{","\\||{","#(){","\\(){",
                       "\\bar{","\\vec{","\\dot{","\\hat{","\\ddot{","\\acute{","\\grave{","\\check{","\\bf{","\\it{","\\mbox{"}; // check for }
   const Char_t *kWord2[] = {"#scale[","#color[","#url[","#font[","#sqrt[","#kern[","#lower[","\\scale[","\\color[","\\font[","\\sqrt[","\\kern[","\\lower["}; // check for ]{ + }
   const Char_t *kWord3[] = {"#frac{","\\frac{","#splitline{","\\splitline{"}; // check for }{ then }
   const Char_t *kLeft1[] = {"#left[","\\left[","#left{","\\left{","#left|","\\left|","#left(","\\left("};
   const Char_t *kLeft2[] = {"#[]{","#[]{","#{}{","#{}{","#||{","#||{","#(){","#(){"};
   const Char_t *kRight[] = {"#right]","\\right]","#right}","\\right}","#right|","\\right|","#right)","\\right)"};
   const Int_t lkWord1[]  = {4,4,2,2,7,7,5,6,6,4,4,4,5,5,5,5,6,7,7,7,7,7,4,4,6,7,7,6,6,4,4,4,4,4,5,5,5,5,6,7,7,7,4,4,6};
   const Int_t lkWord2[]  = {7,7,5,6,6,6,7,7,7,6,6,6,7} ;
   const Int_t lkWord3[]  = {6,6,11,11} ;
   Int_t nkWord1 = 45, nkWord2 = 13, nkWord3 = 4;
   Int_t i,k ;
   Int_t nLeft1 , nRight , nOfLeft, nOfRight;
   Int_t lLeft1 = 6 ;
   Int_t lLeft2 = 4 ;
   Int_t lRight = 7 ;
   nLeft1  = nRight   = 8 ;
   nOfLeft = nOfRight = 0 ;
 
   Char_t buf[11] ; for (i=0;i<11;i++) buf[i]=0;
   Bool_t opFound ;
   Int_t  opFrac = 0;
   Int_t length = text.Length() ;
 
   Int_t nOfCurlyBracket, nOfKW1, nOfKW2, nOfKW3, nOfSquareCurly, nOfCurlyCurly ;
   Int_t nOfSquareBracket = 0 ;
   Int_t error = 0  ;
   Bool_t quote1 = kFALSE , quote2 = kFALSE;
 
   // first find and replace all occurrences of "kLeft1" keyword by "kLeft2" keyword,
   // and all occurrences of "kRight" keyword by "}".
   i = 0 ;
   while (i < length) {
      // The string in 'buf' does not need to be null terminated,
      // we will only check with strncmp.
      strncpy(buf,&text[i],TMath::Min(7,length-i));
      opFound = kFALSE ;
      for (k = 0 ; k < nLeft1 ; k++) {
         if (strncmp(buf,kLeft1[k],lLeft1)==0) {
            nOfLeft++ ;
            i+=lLeft1 ;
            opFound = kTRUE ;
            break ;
         }
      }
      if (opFound) continue ;
 
      for(k=0;k<nRight;k++) {
         if (strncmp(buf,kRight[k],lRight)==0) {
            nOfRight++ ;
            i+=lRight ;
            opFound = kTRUE ;
            break ;
         }
      }
      if (!opFound) i++ ;
   }
   if (nOfLeft != nOfRight) {
      printf(" nOfLeft = %d, nOfRight = %d\n",nOfLeft,nOfRight) ;
      error = 1 ;
      fError = "Operators \"#left\" and \"#right\" don't match !" ;
      goto ERROR_END ;
   }
 
   for (k = 0 ; k < nLeft1 ; k++) {
      text.ReplaceAll(kLeft1[k],lLeft1,kLeft2[k],lLeft2) ;
   }
   for (k = 0 ; k < nRight ; k++) {
      text.ReplaceAll(kRight[k],lRight,"}",1) ;
   }
   length = text.Length() ;
 
   i = nOfCurlyBracket = nOfKW1 = nOfKW2 = nOfKW3 = nOfSquareCurly = nOfCurlyCurly =0 ;
   while (i< length){
         switch (text[i]) {
            case '"' : quote1 = !quote1 ; break ;
            case '\'': quote2 = !quote2 ; break ;
         }
         // The string in 'buf' does not need to be null terminated,
         // we will only check with strncmp
         strncpy(buf,&text[i],TMath::Min(11,length-i));
         opFound = kFALSE ;
 
         for(k=0;k<nkWord1;k++) {
            if (strncmp(buf,kWord1[k],lkWord1[k])==0) {
               nOfKW1++ ;
               i+=lkWord1[k] ;
               opFound = kTRUE ;
               nOfCurlyBracket++ ;
               break ;
            }
         }
         if (opFound) continue ;
 
         for(k=0;k<nkWord2;k++) {
            if (strncmp(buf,kWord2[k],lkWord2[k])==0) {
               nOfKW2++ ;
               i+=lkWord2[k] ;
               opFound = kTRUE ;
               nOfSquareBracket++;
               break ;
            }
         }
         if (opFound) continue ;
 
         for(k=0;k<nkWord3;k++) {
            if (strncmp(buf,kWord3[k],lkWord3[k])==0) {
               nOfKW3++ ;
               i+=lkWord3[k] ;
               opFound = kTRUE ;
               opFrac++ ;
               nOfCurlyBracket++ ;
               break ;
            }
         }
         if (opFound) continue ;
         if (strncmp(buf,"}{",2) == 0 && opFrac) {
               opFrac-- ;
               nOfCurlyCurly++ ;
               i+= 2;
         }
         else if (strncmp(buf,"]{",2) == 0 && nOfSquareBracket) {
               nOfSquareCurly++ ;
               i+= 2 ;
               nOfCurlyBracket++ ;
               nOfSquareBracket-- ;
         }
         else if (strncmp(buf,"@{",2) == 0 || strncmp(buf,"@}",2) == 0) {
               i+= 2 ;
         }
         else if (strncmp(buf,"@[",2) == 0 || strncmp(buf,"@]",2) == 0) {
               i+= 2 ;
         }
         else if (text[i] == ']' ) {  // not belonging to a key word, add @ in front
               text.Insert(i,"@") ;
               length++ ;
               i+=2 ;
         }
         else if (text[i] == '[' ) {  // not belonging to a key word, add @ in front
               text.Insert(i,"@") ;
               length++ ;
               i+=2 ;
         }
         else if (text[i] == '{' ) {  // not belonging to a key word, add @ in front
               text.Insert(i,"@") ;
               length++ ;
               i+=2 ;
         }
         else if (text[i] == '}' ) {
            if ( nOfCurlyBracket) {
               nOfCurlyBracket-- ;
               i++ ;
            } else  { // extra }, add @ in front
               text.Insert(i,"@") ;
               length++ ;
               i+=2 ;
            }
         } else {
            i++ ;
            buf[1] = 0 ;
         }
   }
 
   if (nOfKW2 != nOfSquareCurly) {
      error = 1 ;
      fError = "Invalid number of \"]{\"" ;
   }
   else if (nOfKW3 != nOfCurlyCurly) {
      error = 1 ;
      fError = "Error in syntax of  \"#frac\"" ;
   }
   else if (nOfCurlyBracket  < 0) {
      error = 1 ;
      fError = "Missing \"{\"" ;
   }
   else if (nOfCurlyBracket  > 0) {
      error = 1 ;
      fError = "Missing \"}\"" ;
   }
   else if (nOfSquareBracket  < 0) {
      error  = 1 ;
      fError = "Missing \"[\"" ;
   }
   else if (nOfSquareBracket  > 0) {
      error = 1 ;
      fError = "Missing \"]\"" ;
   }
 
   ERROR_END:
   return error ;
}
 
////////////////////////////////////////////////////////////////////////////////
/// First parsing of the analyse sequence
 
TLatex::TLatexFormSize TLatex::FirstParse(Double_t angle, Double_t size, const Char_t *text)
{
   fTabSize.reserve(100); // ensure 100 entries before memory reallocation required
   fShow       = kFALSE;
   fOriginSize = size;
 
   //get current line attributes
   Short_t lineW = GetLineWidth();
   Int_t lineC = GetLineColor();
 
   TextSpec_t spec;
   spec.fAngle = angle;
   spec.fSize  = GetTextSizePercent(size);
   spec.fColor = GetTextColor();
   spec.fFont  = GetTextFont();
   Short_t halign = fTextAlign/10;
   Short_t valign = fTextAlign - 10*halign;
 
   TLatexFormSize fs = Anal1(spec,text,strlen(text));
 
   SetTextSize(size);
   SetTextAngle(angle);
   SetTextFont(spec.fFont);
   SetTextColor(spec.fColor);
   SetTextAlign(valign+10*halign);
   SetLineWidth(lineW);
   SetLineColor(lineC);
   return fs;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return height of current pad in pixels
 
Double_t TLatex::GetHeight() const
{
   if (!gPad) return 0.;
   Double_t w = gPad->GetAbsWNDC()*Double_t(gPad->GetWw());
   Double_t h = gPad->GetAbsHNDC()*Double_t(gPad->GetWh());
   if (w < h)
      return w;
   else
      return h;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return size of the formula along X in pad coordinates when the text precision
/// is smaller than 3.
 
Double_t TLatex::GetXsize()
{
   if (!gPad) return 0.;
   TString newText = GetTitle();
   if( newText.Length() == 0) return 0;
 
   // The text is a TMathText.
   if ( newText.Contains("\\") ) {
      TMathText tm(0., 0., newText.Data());
      return tm.GetXsize();
   }
 
   fError = nullptr;
   if (CheckLatexSyntax(newText)) {
      Error("GetXsize", "%s\n==> %s", fError, GetTitle());
      return 0;
   }
   fError = nullptr;
 
   const Char_t *text = newText.Data() ;
   Double_t angle_old = GetTextAngle();
   TLatexFormSize fs = FirstParse(0,GetTextSize(),text);
   SetTextAngle(angle_old);
   fTabSize.clear();
   return std::abs(gPad->AbsPixeltoX(fs.Width()) - gPad->AbsPixeltoX(0));
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return text size in pixels
 
void TLatex::GetBoundingBox(UInt_t &w, UInt_t &h, Bool_t angle)
{
   if (!gPad) return;
   TString newText = GetTitle();
   if( newText.Length() == 0) return;
 
   // The text is a TMathText.
   if ( newText.Contains("\\") ) {
      TMathText tm(0., 0., newText.Data());
      tm.GetBoundingBox(w, h);
      return;
   }
 
   fError = nullptr;
   if (CheckLatexSyntax(newText)) {
      Error("GetBoundingBox", "%s\n==> %s", fError, GetTitle());
      return;
   }
   fError = nullptr;
 
   if (angle) {
      Int_t cBoxX[4], cBoxY[4];
      Int_t ptx, pty;
      if (TestBit(kTextNDC)) {
         ptx = gPad->UtoPixel(fX);
         pty = gPad->VtoPixel(fY);
      } else {
         ptx = gPad->XtoAbsPixel(gPad->XtoPad(fX));
         pty = gPad->YtoAbsPixel(gPad->YtoPad(fY));
      }
      GetControlBox(ptx, pty, fTextAngle, cBoxX, cBoxY);
      Int_t x1 = cBoxX[0];
      Int_t x2 = cBoxX[0];
      Int_t y1 = cBoxY[0];
      Int_t y2 = cBoxY[0];
      for (Int_t i=1; i<4; i++) {
         if (cBoxX[i] < x1) x1 = cBoxX[i];
         if (cBoxX[i] > x2) x2 = cBoxX[i];
         if (cBoxY[i] < y1) y1 = cBoxY[i];
         if (cBoxY[i] > y2) y2 = cBoxY[i];
      }
      w = x2-x1;
      h = y2-y1;
   } else {
      const Char_t *text = newText.Data() ;
      TLatexFormSize fs = FirstParse(GetTextAngle(),GetTextSize(),text);
      fTabSize.clear();
      w = (UInt_t)fs.Width();
      h = (UInt_t)fs.Height();
   }
}
 
////////////////////////////////////////////////////////////////////////////////
/// Return size of the formula along Y in pad coordinates when the text precision
/// is smaller than 3.
 
Double_t TLatex::GetYsize()
{
   if (!gPad) return 0.;
   TString newText = GetTitle();
   if( newText.Length() == 0) return 0;
 
   // The text is a TMathText.
   if ( newText.Contains("\\") ) {
      TMathText tm(0., 0., newText.Data());
      return tm.GetYsize();
   }
 
   fError = nullptr;
   if (CheckLatexSyntax(newText)) {
      Error("GetYsize", "%s\n==> %s", fError, GetTitle());
      return 0;
   }
   fError = nullptr;
 
   const Char_t *text = newText.Data();
   Double_t angsav = fTextAngle;
   TLatexFormSize fs = FirstParse(0,GetTextSize(),text);
   fTextAngle = angsav;
   fTabSize.clear();
   return std::abs(gPad->AbsPixeltoY(fs.Height()) - gPad->AbsPixeltoY(0));
}
 
////////////////////////////////////////////////////////////////////////////////
/// Read fs in fTabSize
 
TLatex::TLatexFormSize TLatex::Readfs()
{
   if (fTabSize.empty()) {
      Error("Readfs", "No data in fTabSize stack");
      return TLatexFormSize(0,0,0);
   }
 
   TLatexFormSize result = fTabSize.back();
   fTabSize.pop_back();
   return result;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Save fs values in array fTabSize
 
void TLatex::Savefs(TLatex::TLatexFormSize *fs)
{
   fTabSize.emplace_back(*fs);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Save primitive as a C++ statement(s) on output stream out
 
void TLatex::SavePrimitive(std::ostream &out, Option_t *option)
{
   SavePrimitiveConstructor(
      out, Class(), "tex",
      TString::Format("%g, %g, \"%s\"", fX, fY, TString(GetTitle()).ReplaceSpecialCppChars().Data()), kFALSE);
 
   SaveTextAttributes(out, "tex", 11, 0, 1, 62, 0.05);
   SaveLineAttributes(out, "tex", 1, 1, 1);
 
   if (TestBit(kTextNDC))
      out << "   tex->SetNDC();\n";
 
   SavePrimitiveDraw(out, "tex", option);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set relative size of subscripts and superscripts
 
void TLatex::SetIndiceSize(Double_t factorSize)
{
   fFactorSize = factorSize;
}
 
////////////////////////////////////////////////////////////////////////////////
/// Set limit for text resizing of subscripts and superscripts
 
void TLatex::SetLimitIndiceSize(Int_t limitFactorSize)
{
   fLimitFactorSize = limitFactorSize;
}