% !TeX root = ./examples/cat.tex
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% This package is part of the TikZlings package
%% A package to bring cute little animals and other beings into tikz
%% Maintained by samcarter
%%
%% Project repository and bug tracker:
%% https://github.com/samcarter/tikzlings
%%
%% Released under the LaTeX Project Public License v1.3c or later
%% See http://www.latex-project.org/lppl.txt
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ProvidesPackage{tikzlings-cats}[2022/06/17 version v1.0 Drawing cats in TikZ]

\RequirePackage{tikz}
\RequirePackage{tikzlings-addons}

\RequirePackage{expl3}
\ExplSyntaxOn
\ifdefined\sys_rand_seed:
  \pgfmathsetseed {\sys_rand_seed:}
\else
  \ifdefined\pdfrandomseed % pdflatex
  \else
      \ifdefined\randomseed 
        \let\pdfrandomseed\randomseed % post TL19 xelatex and lualatex
      \else
          \let\pdfrandomseed\time % pre TL19 xelatex
      \fi
  \fi
  \pgfmathsetseed{\number\pdfrandomseed} 
\fi
\ExplSyntaxOff

\newcommand*{\cat}[1][]{%
  \begin{scope}%
    \tikzset{/cat/.cd,#1}%
    \ifcat@schroedinger
      \pgfmathparse{int(random(0,1))}
      \let\cat@random=\pgfmathresult
      \ifnum\cat@random=1
        \cat@tombstone%
       \else
         \cat@draw%
      \fi
    \else
      \cat@draw%
    \fi
  \end{scope}%
  \thing[#1]%
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname cathookforeground\endcsname
  \csname tikzlinghookforeground\endcsname
}

\newif\ifcat@threeD
\newif\ifcat@schroedinger
\newif\ifcat@back
\newif\ifcat@contour

\tikzset{
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % Pass unknown keys on to tikz
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  /cat/.search also={/tikz,/pgf,/thing},
  /cat/.cd,
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % body
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  body/.store in          = \cat@body,
  body                    = gray!30!black,
  whiskers/.store in      = \cat@whiskers,
  whiskers                = gray!50!white,
  eye/.store in           = \cat@eye,
  eye                     = yellow!80!orange,
  eyes/.forward to        = /cat/eye,
  pupil/.store in         = \cat@pupil,
  pupil                   = black,
  pupilwidth/.code        = \def\cat@pupil@width{#1}
                            \edef\cat@pupil@offset{\strip@pt\dimexpr#1pt/4},
  pupil width/.forward to = /cat/pupilwidth,
  narrow pupils/.code     = \def\cat@pupil@width{0.005}
                            \edef\cat@pupil@offset{\strip@pt\dimexpr 0.005pt/4},
  medium pupils/.code     = \def\cat@pupil@width{0.015}
                            \edef\cat@pupil@offset{\strip@pt\dimexpr 0.015pt/4},
  wide pupils/.code       = \def\cat@pupil@width{0.025}
                            \edef\cat@pupil@offset{\strip@pt\dimexpr 0.025pt/4},
  very wide pupils/.code  = \def\cat@pupil@width{0.050}
                            \edef\cat@pupil@offset{\strip@pt\dimexpr 0.050pt/4},
  pupil width             = 0.015,
  paws/.store in          = \cat@paws,
  paws                    = \cat@body,
  nose/.store in          = \cat@nose,
  nose                    = red!40!white!80!gray,
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % options
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  3D/.code           = \cat@threeDtrue,
  schroedinger/.code = \cat@schroedingertrue,
  back/.code         = \cat@backtrue,  
  contour/.code      = \cat@contourtrue
                       \def\cat@contour{#1}
                       \def\cat@whiskers{#1},
  contour/.default   = black,  
  outline/.forward to = /cat/contour,   
}

\def\cat@draw{%
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % minimal bounding box size 
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \path (-0.56,0.1) rectangle (1.63, 2.22);
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % store the current scale factor
  % from https://github.com/samcarter/tikzlings/issues/3#issuecomment-461373494
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \pgfgettransformentries{\tmpscaleA}{\tmpscaleB}{\tmpscaleC}{\tmpscaleD}{\tmp}{\tmp}%
  \pgfmathsetmacro{\scalingfactor}{sqrt(abs(\tmpscaleA*\tmpscaleD-\tmpscaleB*\tmpscaleC))*sqrt(abs((\pgf@xx/1cm)*(\pgf@yy/1cm)-(\pgf@xy/1cm)*(\pgf@yx/1cm)))}%
  \pgfmathsetmacro{\xscalefactor}{\tmpscaleA}
  \pgfmathsetmacro{\yscalefactor}{\tmpscaleD}
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  % 
  % switch between 2D, 3D and contours, from
  % https://chat.stackexchange.com/transcript/message/45991801#45991801
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \ifcat@threeD
    \def\cat@part@draw[##1]{\shade[ball color=##1]}
  \else% 3D
    \ifcat@contour
      \def\cat@part@draw[##1]{\draw[##1,\cat@contour,fill=white,line width=\scalingfactor*0.4pt]}
    \else% contour
      \def\cat@part@draw[##1]{\fill[##1]}
    \fi% contour
  \fi% 3D
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % Body parts
  % 
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname cathookbackground\endcsname
  \csname tikzlinghookbackground\endcsname
  %
  % Tail %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \cat@part@draw[\cat@body,overlay] (0.3, 0.5) .. controls (0.55, 0.87) and (0.73, 1.50) .. (1.05, 1.65) .. controls (1.32, 1.77) and (1.76, 1.34) .. (1.56,1.33) .. controls (0.92, 2.03) and (0.86, 0.60) .. (0.5, 0.37) -- cycle;
  %
  % Feet if back %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \ifcat@back
    \cat@part@draw[\cat@paws] (-0.255,0.3) circle[radius=0.18];  
    \cat@part@draw[\cat@paws] (0.255,0.3) circle[radius=0.18];
  \fi% back
  %
  % Body %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \cat@part@draw[\cat@body] (0.5462, 0.7155) .. controls (0.5462, 0.1823) and (0.3259, 0.17) .. (0, 0.17) .. controls (-0.3259, 0.17) and (-0.5462, 0.1823) .. (-0.5462, 0.7155) .. controls (-0.5554, 1.2487) and (-0.3075, 1.6768) .. (0, 1.6768) .. controls (0.3075, 1.6768) and (0.5554, 1.2487) .. (0.5462, 0.7155) -- cycle;
  %
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname cathookbelly\endcsname
  \csname tikzlinghookbelly\endcsname
  %
  % Ears %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \cat@part@draw[\cat@body] 
  (0.12, 2.0392) .. controls (0.16, 2.1584) and (0.37, 2.22) .. (0.37, 2.20) .. controls (0.37, 2.2) and (0.39, 1.9) .. (0.2721, 1.9) .. controls (0.1891, 1.88) and (0.12, 1.88) .. (0.12, 2.0392) -- cycle; 
  \cat@part@draw[\cat@body] 
  (-0.12, 2.0392) .. controls (-0.16, 2.1584) and (-0.37, 2.22) .. (-0.37, 2.20) .. controls (-0.37, 2.2) and (-0.39, 1.9) .. (-0.2721, 1.9) .. controls (-0.1891, 1.88) and (-0.12, 1.88) .. (-0.12, 2.0392) -- cycle;
  %
  % Head %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \cat@part@draw[\cat@body] (0,1.64) circle[radius=0.44];
  %
  % Show details only from the front %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \unless\ifcat@back
    %
    % Eyes %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \cat@part@draw[\cat@eye] (-0.1014, 1.7491) .. controls (-0.1014, 1.7491) and (-0.1451, 1.7171) .. (-0.1841, 1.7284) .. controls (-0.2231, 1.7397) and (-0.2427, 1.79) .. (-0.2427, 1.79) .. controls (-0.2427, 1.79) and (-0.1992, 1.8221) .. (-0.1602, 1.8108) .. controls (-0.1212, 1.7995) and (-0.1014, 1.7491) .. (-0.1014, 1.7491) -- cycle;
    \cat@part@draw[\cat@eye] (0.1014, 1.7491) .. controls (0.1014, 1.7491) and (0.1451, 1.7171) .. (0.1841, 1.7284) .. controls (0.2231, 1.7397) and (0.2427, 1.79) .. (0.2427, 1.79) .. controls (0.2427, 1.79) and (0.1992, 1.8221) .. (0.1602, 1.8108) .. controls (0.1212, 1.7995) and (0.1014, 1.7491) .. (0.1014, 1.7491) -- cycle;
    %
    % Pupils %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \cat@part@draw[\cat@pupil] (-0.1720, 1.8071) .. controls (-0.1720+\cat@pupil@width, 1.7827+\cat@pupil@offset) and (-0.1720+\cat@pupil@width, 1.7584-\cat@pupil@offset) .. (-0.1720, 1.7341) .. controls (-0.1720-\cat@pupil@width, 1.7584-\cat@pupil@offset) and (-0.1720-\cat@pupil@width, 1.7827+\cat@pupil@offset) .. (-0.1720, 1.8071) -- cycle;
    \cat@part@draw[\cat@pupil] ( 0.1720, 1.8071) .. controls ( 0.1720+\cat@pupil@width, 1.7827+\cat@pupil@offset) and ( 0.1720+\cat@pupil@width, 1.7584-\cat@pupil@offset) .. ( 0.1720, 1.7341) .. controls ( 0.1720-\cat@pupil@width, 1.7584-\cat@pupil@offset) and ( 0.1720-\cat@pupil@width, 1.7827+\cat@pupil@offset) .. ( 0.1720, 1.8071) -- cycle;
    %
    % Mouth %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \draw[\cat@whiskers,line width=\scalingfactor*0.2pt] (-0.16, 1.527) .. controls (-0.16, 1.527) and (-0.062, 1.420) .. ( 0.000, 1.556)  .. controls ( 0.062, 1.420) and ( 0.16, 1.527) .. ( 0.16, 1.527);
    %
    % Nose %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \cat@part@draw[\cat@nose] (-0.069, 1.6452) .. controls (-0.0524, 1.6613) and (0.0524, 1.6613) .. (0.069, 1.6452) .. controls (0.08, 1.625) and (0.0206, 1.55) .. (0, 1.55) .. controls (-0.0206, 1.55) and (-0.08, 1.625) .. (-0.069, 1.6452) -- cycle;
    %
    % Wiskers %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \fill[\cat@whiskers] (0.0788, 1.5946) .. controls (0.1658, 1.6099) and (0.2086, 1.5439) .. (0.2956, 1.5286) -- (0.2956, 1.5386) .. controls (0.2097, 1.5537) and (0.1648, 1.6097) .. (0.0788, 1.5946) -- cycle;
    \fill[\cat@whiskers] (-0.0788, 1.5946) .. controls (-0.1658, 1.6099) and (-0.2087, 1.5439) .. (-0.2956, 1.5286) -- (-0.2956, 1.5386) .. controls (-0.2097, 1.5537) and (-0.1648, 1.6097) .. (-0.0788, 1.5946) -- cycle;
    \fill[\cat@whiskers] (0.0752, 1.6081) .. controls (0.1583, 1.6383) and (0.2171, 1.6109) .. (0.3002, 1.5807) -- (0.3002, 1.5907) .. controls (0.2174, 1.6208) and (0.158, 1.6382) .. (0.0752, 1.6081) -- cycle;
    \fill[\cat@whiskers] (-0.0752, 1.6081) .. controls (-0.1583, 1.6383) and (-0.2171, 1.6109) .. (-0.3002, 1.5807) -- (-0.3002, 1.5907) .. controls (-0.2174, 1.6208) and (-0.158, 1.6382) .. (-0.0752, 1.6081) -- cycle;
    \fill[\cat@whiskers] (0.0671, 1.6243) .. controls (0.1414, 1.6725) and (0.2182, 1.6964) .. (0.2925, 1.6482) -- (0.2925, 1.6582) .. controls (0.2179, 1.7066) and (0.1417, 1.6727) .. (0.0671, 1.6243) -- cycle;
    \fill[\cat@whiskers] (-0.0671, 1.6243) .. controls (-0.1414, 1.6725) and (-0.2182, 1.6964) .. (-0.2925, 1.6482) -- (-0.2925, 1.6582) .. controls (-0.2179, 1.7066) and (-0.1417, 1.6727) .. (-0.0671, 1.6243) -- cycle;
    %
    % Feet %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
    \cat@part@draw[\cat@paws] (-0.255,0.3) circle[radius=0.18];  
    \cat@part@draw[\cat@paws] (0.255,0.3) circle[radius=0.18]; 
    %
  \fi% back
  %
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname cathookbody\endcsname
  \csname tikzlinghookbody\endcsname
}

\def\cat@tombstone{%
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % minimal bounding box size 
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \path (-0.55,0.39) rectangle (0.55, 2.06);
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % store the current scale factor
  % from https://github.com/samcarter/tikzlings/issues/3#issuecomment-461373494
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \pgfgettransformentries{\tmpscaleA}{\tmpscaleB}{\tmpscaleC}{\tmpscaleD}{\tmp}{\tmp}%
  \pgfmathsetmacro{\scalingfactor}{sqrt(abs(\tmpscaleA*\tmpscaleD-\tmpscaleB*\tmpscaleC))}%
  \pgfmathsetmacro{\xscalefactor}{\tmpscaleA}
  \pgfmathsetmacro{\yscalefactor}{\tmpscaleD}
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  % 
  % switch between 2D, 3D and contours, from
  % https://chat.stackexchange.com/transcript/message/45991801#45991801
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \ifcat@threeD
    \def\cat@part@draw[##1]{\shade[ball color=##1]}
  \else% 3D
    \ifcat@contour
      \def\cat@part@draw[##1]{\draw[##1,\cat@contour,fill=white,line width=\scalingfactor*0.4pt]}
    \else% contour
      \def\cat@part@draw[##1]{\fill[##1]}
    \fi% contour
  \fi% 3D
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  % 
  % Drawing the tomebstone
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname cathookbackground\endcsname
  \csname tikzlinghookbackground\endcsname
  %
  % Stone %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \cat@part@draw[gray] (-0.55,0.4) -- (-0.55,1.5) arc [start angle=180, end angle=0, radius=0.55] -- (0.55,0.4) -- cycle;
  \node[scale=\scalingfactor] at (0,1.3) {R.I.P.};
  %
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname cathookbelly\endcsname
  \csname tikzlinghookbelly\endcsname
  %
  % soil %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \cat@part@draw[brown!65!black] (1,0.15) arc [start angle=50, end angle=130, radius=1.56] -- cycle;
  %
  % flower %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \ifcat@contour
    \draw[\cat@contour,line width=\scalingfactor*0.4pt] (-0.01,0.3) arc [start angle=-15, end angle=30, radius=0.7];
  \else% contour
    \draw[green!50!brown,line width=\scalingfactor*0.4pt] (-0.01,0.3) arc [start angle=-15, end angle=30, radius=0.7];
  \fi% contour
  \cat@part@draw[green!50!brown] (-0.1377, 0.7384) .. controls (-0.1775, 0.5828) and (-0.1479, 0.4649) .. (0.0072, 0.4246) .. controls (0.0570, 0.5636) and (-0.1529, 0.6447) .. (-0.1377, 0.7384) -- cycle;
  \cat@part@draw[green!50!brown] (0.1527, 0.7334) .. controls (0.1925, 0.5778) and (0.1629, 0.4599) .. (0.0178, 0.4196) .. controls (-0.0420, 0.5586) and (0.1679, 0.6397) .. (0.1527, 0.7334) -- cycle;
  \foreach \i in {0,51.42857,...,359}{
    \cat@part@draw[yellow!50!white,rotate around={\i:(-0.0865, 0.8219)}] (-0.087, 0.822) .. controls (-0.087, 0.822) and (-0.1635, 0.6638) .. (-0.0818, 0.6653) .. controls (-0.0066, 0.6646) and (-0.087, 0.822) .. (-0.087, 0.822) -- cycle;
  }
  %
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname cathookbody\endcsname
  \csname tikzlinghookbody\endcsname
  %
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% Documentation
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\clearpage
%\section[Cat]{MisTi$k$Zelees, the cat}
%
%\emph{Named after the worlds best singing cat}
%
%\subsection{Package name}
%
%\begin{tcolorbox}[lower separated=false, lefthand width=.8\linewidth]
%\vspace*{0.5cm}
%\lstinline|\usepackage{tikzlings-cats}| 
%\vspace*{0.5cm}
%\end{tcolorbox}
%
%\subsection{Basic Usage}
%
%\begin{tcblisting}{}
%\cat
%\end{tcblisting}
%
%\subsection{Options}
%
%The basic cat can be modified by changing its colour:
%\begin{tcblisting}{}
%\cat[body=blue]
%\end{tcblisting}
%
%In addition to the colour of the body, the colour of various body parts can be adjusted:
%\begin{tcblisting}{}
%\cat[eye=green]
%\end{tcblisting}
%\begin{tcblisting}{}
%\cat[pupil=red]
%\end{tcblisting}
%\begin{tcblisting}{}
%\cat[nose=red]
%\end{tcblisting}
%\begin{tcblisting}{}
%\cat[whiskers=red]
%\end{tcblisting}
%\begin{tcblisting}{}
%\cat[paws=red]
%\end{tcblisting}
%
%The shape of the \lstinline|pupil| can be changed with the \lstinline|pupilwidth| option:
%\begin{tcblisting}{}
%\cat[pupilwidth=0.015]
%\end{tcblisting}
%
%Additionally several predefined widths exist:
%\begin{tcolorbox}
%\begin{lstlisting}[morekeywords={narrow,medium,wide,very,pupils}]
%\cat[narrow pupils]
%
%\cat[medium pupils]
%
%\cat[wide pupils]
%
%\cat[very wide pupils]
%\end{lstlisting} 
%
%\tcblower
%\begin{tikzpicture}[yshift=2.4cm,xshift=1.8cm]
%\cat[narrow pupils]
%\cat[medium pupils,xshift=2.5cm]
%\cat[wide pupils,yshift=-2.5cm]
%\cat[very wide pupils,xshift=2.5cm,yshift=-2.5cm]
%\end{tikzpicture}
%\end{tcolorbox}
%
%There is also the special option \lstinline|schroedinger|. This cat is both alive and dead as long as you did not compile your document.
%Be prepared for a possibly disturbing scene when you open the pdf, this option is not suited for sensitive \tikzlings.
%\begingroup
%\makeatletter
%\renewcommand*{\cat}[1][]{%
%    \tikzset{/cat/.cd,#1}%
%    \cat@tombstone%
%}
%\renewcommand{\cathookbackground}{}
%\makeatother
%\begin{tcblisting}{}
%\cat[schroedinger]
%\end{tcblisting}
%\endgroup
%
%To view the cat from behind:
%\begin{tcblisting}{}
%\cat[back]
%\end{tcblisting}
%
%The key \lstinline|3D| will make the cat 3-dimensional:
%\begin{tcblisting}{}
%\cat[3D]
%\end{tcblisting}
%
%And finally the \lstinline|contour| key will only draw the outlines:
%\begin{tcblisting}{}
%\cat[contour=black]
%\end{tcblisting}