index.md

2D Graphics Libraries

TASImage

• In some cases dashed lines with a line width greater than "1" were not drawn.
• The TLatex symbol #tilde, was misplaced.
• In TASImage::DrawtText, TTF::SetTextSize was called with a rounded value (to pixel). This cause some misplacements of character in TLatex formulae.

TPDF and TPostScript

• Parenthesis can be used in PDF and PS file names.
• In PDF files, italic greek characters were not correct for non null text angle.

New class TTeXDump: Graphics interface to TeX

This class allow to generate PGF/TikZ vector graphics output which can be included in TeX and LaTeX documents.

PGF is a TeX macro package for generating graphics. It is platform and format-independent and works together with the most important TeX backend drivers, including pdftex and dvips. It comes with a user-friedly syntax layer called TikZ.

To generate a such file it is enough to do:

   gStyle->SetPaperSize(10.,10.);
   hpx->Draw();
   gPad->Print("hpx.tex");

Then, the generated file (hpx.tex) can be included in a LaTeX document (simple.tex) in the following way:

`` \documentclass{article} \usepackage{tikz} \usetikzlibrary{patterns} \title{A simple LaTeX example} \date{July 2013} \begin{document} \maketitle The following image as been generated using the TTeXDump class: \par \input{hpx.tex} \end{document}

Note the two directive needed at the top of the LaTeX file:

\usepackage{tikz} \usetikzlibrary{patterns}

Then including the picture in the document is done with the
`\input` directive.

The command `pdflatex simple.tex` will generate the corresponding pdf
file `simple.pdf`.


### X11 fonts

-   A coverity fix in `Rotated.cxx` had a side effect on rotated text
    drawn with X11 fonts.

### TCanvas

- 'TPad::SaveAs' produces named macros in .C files.

### TGaxis and TAxis

-   The time axis behavior should now be correct along time zone and
    summer saving time. A fix has been done with the of Philippe Gras
    (CEA Saclay. IRFU/SEDI) and Julian Sitarek (IFAE). Time axis
    transported from a time zone to an other in a ROOT file are correct
    too. A new example test have been introduced to test the time axis
    (timeonaxis3.C)

### TLegend

-   The line attribute of objects in the legend were not taken into
    account with the option "e".
-   In case of automatic computation of the legend items' size, the 
    text size was wrong if the font precision was set to 3.
-   Improve the spacing between lines. Due to the way the vertical 
    text centring is done (bounding based) the spacing between lines 
    may appeared irregular in some cases.
-   The error bar in the legend (option "E") didn't have the line
    attributes when drawn alone (without option "L"). 

### TPie

-   New drawing option "SC" to draw the labels with the slices' colors.

### TLine

-   Add `SetNDC`.

### TMathText

-   TMathText's purpose is to write mathematical equations, exactly as
    TeX would do it. The syntax is the same as the TeX's one. Author:
    Yue Shi Lai (MIT)) \
    Example:

``` {.cpp}
    {
       TMathText l;
       l.SetTextAlign(23);
       l.SetTextSize(0.06);
       l.DrawMathText(0.50, 1.000, "\\prod_{j\\ge0} \\left(\\sum_{k\\ge0} a_{jk}z^k\\right) = \\sum_{n\\ge0} z^n \\left(\\sum_{k_0,k_1,\\ldots\\ge0\\atop k_0+k_1+\\cdots=n} a_{0k_0}a_{1k_1} \\cdots \\right)");
       l.DrawMathText(0.50, 0.800, "W_{\\delta_1\\rho_1\\sigma_2}^{3\\beta} = U_{\\delta_1\\rho_1\\sigma_2}^{3\\beta} + {1\\over 8\\pi^2} \\int_{\\alpha_1}^{\\alpha_2} d\\alpha_2^\\prime \\left[ {U_{\\delta_1\\rho_1}^{2\\beta} - \\alpha_2^\\prime U_{\\rho_1\\sigma_2}^{1\\beta} \\over U_{\\rho_1\\sigma_2}^{0\\beta}} \\right]");
       l.DrawMathText(0.50, 0.600, "d\\Gamma = {1\\over 2m_A} \\left( \\prod_f {d^3p_f\\over (2\\pi)^3} {1\\over 2E_f} \\right) \\left| \\mathscr{M} \\left(m_A - \\left\\{p_f\\right\\} \\right) \\right|^2 (2\\pi)^4 \\delta^{(4)} \\left(p_A - \\sum p_f \\right)");
       l.DrawMathText(0.50, 0.425, "4\\mathrm{Re}\\left\\{{2\\over 1-\\Delta\\alpha} \\chi(s) \\left[ \\^{g}_\\nu^e \\^{g}_\\nu^f (1 + \\cos^2\\theta) + \\^{g}_a^e \\^{g}_a^f \\cos\\theta \\right] \\right\\}");
       l.DrawMathText(0.50, 0.330, "p(n) = {1\\over\\pi\\sqrt{2}} \\sum_{k = 1}^\\infty \\sqrt{k} A_k(n) {d\\over dn} {\\sinh \\left\\{ {\\pi\\over k} \\sqrt{2\\over 3} \\sqrt{n - {1\\over 24}} \\right\\} \\over \\sqrt{n - {1\\over 24}}}");
       l.DrawMathText(0.13, 0.150, "{(\\ell+1)C_{\\ell}^{TE} \\over 2\\pi}");
       l.DrawMathText(0.27, 0.110, "\\mathbb{N} \\subset \\mathbb{R}");
       l.DrawMathText(0.63, 0.100, "\\hbox{RHIC スピン物理 Нью-Йорк}");
    }

• Implement \\frac using \\over.
• Treat \\mbox as \\hbox to improve the compatibility with TTexDump.

TLatex

• 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.
• Fix a very old bug (in TTF.cxx since the beginning). With the following code the spaces between "text" and #lambda were ignored.

       TLatex t; t.DrawLatex( 0.1,0.1,"text   #Lambda" )

• Implement #backslash.
• Implement DrawLatexNDC.
• Implement #minus and #plus typographically better than the standard "-" and "+".
• Make sure all greek and math symbols are printed correctly by TTexDump.
• Implement dummy operators #mbox and #hbox to improve the compatibility between TLatex, TMathText and TTexDump.
• Some operators like #minus, #plus, #mp, #hbar etc ... ignored the color defined by the operator #color.