Is it possible to highlight every cell with counters `iRow `and `jCol` in `NiceTabular`

highlightingnicematrixtikz-pgf

It is very common for me to need to place braces in matrix environment in a controlled fashion which I find NiceTabular environment suitable for such purpose.

One difficulty I encounter is that when tables are very large in size, it becomes harder to determine the position of each cell in the table. Is it possible to systematically highlight the cells numbers using the counters iRow and jCol as follows?

The following requirements are to be met

The highlighting color and transparency should be controllable
Highlighting should go exactly in the middle of each cell (even when \Block environment is used, cells of the \Block should still be highlighted)
If possible, the highlighting should be done using a convenient key to be added in the options

My MWE

\documentclass[11pt, a4paper]{article}

\usepackage{nicematrix}

\usepackage{calc}
\newlength{\widthCell}
\newcommand{\phantombox}[2]{%
    \setlength{\widthCell}{\widthof{{Cell \arabic{iRow},\arabic{jCol}}}}%
    {#2}\llap{\parbox{\widthCell}{\centering\color{gray!25}#1}}%
    }

\begin{document}

\begin{NiceTabular}[hvlines,rules/color=[gray]{0.89},rules/width=0.2pt]{*{3}c}
    
    \phantombox{\arabic{iRow},\arabic{jCol}}{Cell \arabic{iRow},\arabic{jCol}} & \phantombox{\arabic{iRow},\arabic{jCol}}{Cell \arabic{iRow},\arabic{jCol}} & \phantombox{\arabic{iRow},\arabic{jCol}}{Cell \arabic{iRow},\arabic{jCol}}
    \\
    
    \phantombox{\arabic{iRow},\arabic{jCol}}{Cell \arabic{iRow},\arabic{jCol}} & \phantombox{\arabic{iRow},\arabic{jCol}}{Cell \arabic{iRow},\arabic{jCol}} & \phantombox{\arabic{iRow},\arabic{jCol}}{Cell \arabic{iRow},\arabic{jCol}}
    \\
    
    \phantombox{\arabic{iRow},\arabic{jCol}}{Cell \arabic{iRow},\arabic{jCol}} & \phantombox{\arabic{iRow},\arabic{jCol}}{Cell \arabic{iRow},\arabic{jCol}} & \phantombox{\arabic{iRow},\arabic{jCol}}{Cell \arabic{iRow},\arabic{jCol}}
    \\
    
    \CodeAfter
    \SubMatrix{\{}{1-1}{3-1}{.}
    \SubMatrix{.}{1-2}{2-2}{\}}
    
    
\end{NiceTabular}

\end{document}

Best Answer

\documentclass{article}
\usepackage{nicematrix,tikz}

\ExplSyntaxOn
\NewDocumentCommand \HighLight { O { } }
  {
    \foreach \i in {1,...,\arabic{iRow}}
      \foreach \j in {1,...,\arabic{jCol}}
        { 
          \tikz [remember~picture, overlay] 
            \node [opacity=0.5] at (\i.5-|\j.5) { \Large \color{red} \i , \j } ;
        }
  }

\ExplSyntaxOff

\begin{document}

\begin{NiceTabular}{ccc}[hvlines,cell-space-limits=3pt]
\Block{2-2}{test} &           & test \\
                  &           & blabla \\
test              & some text & nothing 
\CodeAfter \HighLight
\end{NiceTabular}

\end{document}

As usual with nicematrix, you need several compilations.

Related Solutions

Is it possible to highlight and underline at the same time

A suitably modified censor package may provide something useful, in this regard. Make sure you get the latest [2021-12-23] version loaded, https://www.ctan.org/pkg/censor.

\documentclass{article}
\usepackage{censor}[2021-12-23]
\usepackage{xcolor,stackengine}
\makeatletter
\renewcommand\censorrule[1]{\textcolor{yellow}{\protect
  \rule[\censorruledepth]{#1}{\censorruleheight}}}

\newcommand\censorul[1]{\textcolor{blue}{\protect
  \rule[\censorruledepth]{#1}{1pt}}}

\renewcommand\@cenword[1]{\bgroup
  \renewcommand\stacktype{L}%
  \setstackgap{L}{0pt}%
  \stackon{\stackon{\censorrule{\widthofpbox{#1}}}
            {\censorul{\widthofpbox{#1}}}}%
    {#1}%
  \egroup
}

\def\censpace{\rlap{\censorrule{\spacelap}}%
  \rlap{\censorul{\spacelap}} \llap{\censorrule{\spacelap}}%
  \llap{\censorul{\spacelap}}}
\let\sv@censpace\censpace

\censorruledepth -\dp\strutbox
\censorruleheight \baselineskip
\makeatother
\begin{document}
We now have to test this approach.
\xblackout{Testing of a theory is proceeding at this point.
We must see whether line breaking occurs.  I can even include
  expandable macros if I use v 4.0.  See: \expanded{\today}---however, 
  hyphenation will not occur with this approach.}
The test is now complete.
\end{document}

SUPPLEMENT

The OP points out an underlying problem, which extends not only to this solution, but to the censor package itself, which I will have to repair. The problem concerns macros like \$, \#, \&, etc., which should be consor-able, but which do not expand (via \expanded) into simple text.

The workaround provided was: \xblackout{...\censor{\$}...}.

A better solution is redefine \xblackout to look for such characters in the first place and, finding them, censor them without extra user intervention. The following code block demonstrates how that might be done. Note, however, a solution such as this will be eventually incorporated into the censor package.

Here is the added code needed to redefine \xblackout and to incorporate such a character check. Other character macros can be added to the \testchars macro:

\makeatletter
\xtokcycleenvironment\xblackoutenv
  {\ifx.##1\@dump\censored@word\addcytoks[1]{\censordot}\else
    \@append\censored@word{##1}%
    \tcpeek\@next\ifx\@next\@tcEscapeptr\@dump\censored@word\fi\fi}
  {\tctestifcon\ifexpandarg{\expandafter\processtoks\expandafter{\expanded{##1}}}%
    {\processtoks{##1}}\@dump\censored@word\expandargfalse}
  {\@dump\censored@word\tctestifx{~##1}{\@append\censored@word{##1}}%
    {\tctestifx{\expanded##1}{\expandargtrue}{%
    \testchars{##1}\ifchar\addcytoks{\censor{##1}}\else\addcytoks{##1}\fi}}}
  {\@dump\censored@word\addcytoks{\censpace}}
  {\def\censored@word{}}
  {\@dump\censored@word}

\newif\ifchar
\newcommand\testchars[1]{\charfalse
  \ifx\$#1\chartrue\else
  \ifx\&#1\chartrue\else
  \ifx\##1\chartrue\else
  \fi\fi\fi
}
\makeatother

Best Answer

Related Solutions

Is it possible to highlight and underline at the same time

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