% !TeX root = ./examples/pingu.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-penguins}[2022/06/17 version v1.0 Draw penguins in TikZ]

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

\newcommand*{\penguin}[1][]{%
  \begin{scope}%
    \tikzset{/penguin/.cd,#1}%
    \penguin@draw%
  \end{scope}%
  \thing[#1]%
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname penguinhookforeground\endcsname
  \csname tikzlinghookforeground\endcsname
  %  
}

\newif\ifpenguin@threeD
\newif\ifpenguin@back
\newif\ifpenguin@contour

\tikzset{
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % Pass unknown keys on to tikz
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  /penguin/.search also={/tikz,/pgf,/thing},
  /penguin/.cd,
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % body
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  body/.store in     = \penguin@body,
  body               = black,
  belly/.store in    = \penguin@belly,
  belly              = white!95!black,
  feet/.store in     = \penguin@feet,
  feet               = yellow!50!orange,
  bill/.store in     = \penguin@bill,
  bill               = orange,  
  eye/.store in      = \penguin@eye,
  eye                = white!95!black,
  pupil/.store in    = \penguin@pupil,
  pupil              = black, 
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % options
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  3D/.code           = \penguin@threeDtrue, 
  back/.code         = \penguin@backtrue, 
  contour/.code      = \penguin@contourtrue
                       \def\penguin@contour{#1},
  contour/.default   = black,  
  outline/.forward to = /penguin/contour,    
}

\def\penguin@draw{%
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % minimal bounding box size 
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \path (-0.865, 0.15) rectangle (0.865, 2.13);
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % 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
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \ifpenguin@threeD
    \def\penguin@part@draw[##1]{\shade[ball color=##1]}
  \else% 3D
    \ifpenguin@contour
      \def\penguin@part@draw[##1]{\draw[##1,\penguin@contour,fill=white,line width=\scalingfactor*0.4pt]}
    \else% contour
      \def\penguin@part@draw[##1]{\fill[##1]}
    \fi% contour
  \fi% 3D
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % Body parts
  % 
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname penguinhookbackground\endcsname
  \csname tikzlinghookbackground\endcsname
  %
  % Arms %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \penguin@part@draw[\penguin@body] (0.575,1.2) ellipse[x radius=0.38, y radius=0.1, rotate=-50];
  \penguin@part@draw[\penguin@body] (-0.575,1.2) ellipse[x radius=0.38, y radius=0.1, rotate=50];  
  %
  % Feet if back %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \ifpenguin@back
    \penguin@part@draw[\penguin@feet] 
    (-0.265, 0.3941) .. controls (-0.283, 0.4505) and (-0.373, 0.6014) .. (-0.470, 0.6533) .. controls (-0.571, 0.7075) and (-0.576, 0.6369) .. (-0.554, 0.596) .. controls (-0.526, 0.5416) and (-0.573, 0.5302) .. (-0.602, 0.5384) .. controls (-0.695, 0.5653) and (-0.767, 0.5169) .. (-0.684, 0.434) .. controls (-0.664, 0.4137) and (-0.587, 0.3557) .. (-0.699, 0.3492) .. controls (-0.772, 0.345) and (-0.779, 0.268) .. (-0.689, 0.2445) .. controls (-0.597, 0.2206) and (-0.476, 0.2043) .. (-0.34, 0.2096) .. controls (-0.252, 0.2131) and (-0.237, 0.3059) .. (-0.265, 0.3941) -- cycle;
    \penguin@part@draw[\penguin@feet] 
    (0.265, 0.3941) .. controls (0.283, 0.4505) and (0.3725, 0.6014) .. (0.469, 0.6533) .. controls (0.571, 0.7075) and (0.5756, 0.6369) .. (0.554, 0.596) .. controls (0.526, 0.5416) and (0.5733, 0.5302) .. (0.602, 0.5384) .. controls (0.695, 0.5653) and (0.7672, 0.5169) .. (0.684, 0.434) .. controls (0.663, 0.4137) and (0.587, 0.3557) .. (0.699, 0.3492) .. controls (0.772, 0.345) and (0.7789, 0.268) .. (0.689, 0.2445) .. controls (0.597, 0.2206) and (0.4764, 0.2043) .. (0.34, 0.2096) .. controls (0.252, 0.2131) and (0.2368, 0.3059) .. (0.265, 0.3941) -- cycle;
  \fi% back
  %
  % Body %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \penguin@part@draw[\penguin@body] (0.595, 0.92) .. controls (0.595, 0.26) and (0.355, 0.18) .. (0, 0.18) .. controls (-0.355, 0.18) and (-0.595, 0.26) .. (-0.595, 0.92) .. controls (-0.605, 1.58) and (-0.335, 2.11) .. (0, 2.11) .. controls (0.335, 2.11) and (0.605, 1.58) .. (0.595, 0.92) -- cycle;
  %
  % Belly %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \unless\ifpenguin@back
    \penguin@part@draw[\penguin@belly] (0, 0.6) ellipse[x radius=0.48, y radius=0.35];
  \fi% back
  %
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname penguinhookbelly\endcsname
  \csname tikzlinghookbelly\endcsname
  %
  % Feet %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \unless\ifpenguin@back
    \penguin@part@draw[\penguin@feet] 
    (-0.265, 0.3941) .. controls (-0.283, 0.4505) and (-0.373, 0.6014) .. (-0.470, 0.6533) .. controls (-0.571, 0.7075) and (-0.576, 0.6369) .. (-0.554, 0.596) .. controls (-0.526, 0.5416) and (-0.573, 0.5302) .. (-0.602, 0.5384) .. controls (-0.695, 0.5653) and (-0.767, 0.5169) .. (-0.684, 0.434) .. controls (-0.664, 0.4137) and (-0.587, 0.3557) .. (-0.699, 0.3492) .. controls (-0.772, 0.345) and (-0.779, 0.268) .. (-0.689, 0.2445) .. controls (-0.597, 0.2206) and (-0.476, 0.2043) .. (-0.34, 0.2096) .. controls (-0.252, 0.2131) and (-0.237, 0.3059) .. (-0.265, 0.3941) -- cycle;
    \penguin@part@draw[\penguin@feet] 
    (0.265, 0.3941) .. controls (0.283, 0.4505) and (0.3725, 0.6014) .. (0.469, 0.6533) .. controls (0.571, 0.7075) and (0.5756, 0.6369) .. (0.554, 0.596) .. controls (0.526, 0.5416) and (0.5733, 0.5302) .. (0.602, 0.5384) .. controls (0.695, 0.5653) and (0.7672, 0.5169) .. (0.684, 0.434) .. controls (0.663, 0.4137) and (0.587, 0.3557) .. (0.699, 0.3492) .. controls (0.772, 0.345) and (0.7789, 0.268) .. (0.689, 0.2445) .. controls (0.597, 0.2206) and (0.4764, 0.2043) .. (0.34, 0.2096) .. controls (0.252, 0.2131) and (0.2368, 0.3059) .. (0.265, 0.3941) -- cycle;
  \fi% back
  %
  % Eyes %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \unless\ifpenguin@back
    \ifpenguin@contour
      \penguin@part@draw[\penguin@eye] (-0.175,1.64) ellipse[x radius=0.1, y radius=0.15, rotate=-10];
      \penguin@part@draw[\penguin@pupil] (-0.145,1.625) ellipse[x radius=0.0357, y radius=0.0714, rotate=-3];
      \penguin@part@draw[\penguin@eye] (0.175,1.64) ellipse[x radius=0.1, y radius=0.15, rotate=10];
      \penguin@part@draw[\penguin@pupil] (0.145,1.625) ellipse[x radius=0.0357, y radius=0.0714, rotate=3];
    \else% contour
      \fill[\penguin@eye] (-0.175,1.64) ellipse[x radius=0.1, y radius=0.15, rotate=-10];
      \fill[\penguin@pupil] (-0.145,1.625) ellipse[x radius=0.0357, y radius=0.0714, rotate=-3];
      \fill[\penguin@eye] (0.175,1.64) ellipse[x radius=0.1, y radius=0.15, rotate=10];
      \fill[\penguin@pupil] (0.145,1.625) ellipse[x radius=0.0357, y radius=0.0714, rotate=3];
    \fi% contour
  \fi% back
  %
  % Bill %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \unless\ifpenguin@back
    \penguin@part@draw[\penguin@bill] (0.323, 1.4591) .. controls (0.1467, 1.3257) and (0.1066, 1.4365) .. (0, 1.4358) .. controls (-0.1066, 1.4365) and (-0.1467, 1.3257) .. (-0.323, 1.4591) .. controls (-0.1267, 1.075) and (0.1267, 1.075) .. (0.323, 1.4591) -- cycle;
  \fi% back
  %
  % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  \csname penguinhookbody\endcsname
  \csname tikzlinghookbody\endcsname
  %
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% Documentation
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\clearpage
%\section[Penguin]{Tux, the penguin}
%
%\emph{Dedicated to the Linux mascot}
%
%\subsection{Package name}
%
%\begin{tcolorbox}[lower separated=false, lefthand width=.8\linewidth]
%\vspace*{0.5cm}
%\lstinline|\usepackage{tikzlings-penguins}| 
%\vspace*{0.5cm}
%\end{tcolorbox}
%
%\subsection{Basic Usage}
%
%\begin{tcblisting}{}
%\penguin
%\end{tcblisting}
%
%\subsection{Options}
%
%The basic penguin can be modified by changing its colour:
%\begin{tcblisting}{}
%\penguin[body=blue]
%\end{tcblisting}
%
%In addition to the colour of the body, the colour of various body parts can be adjusted:
%\begin{tcblisting}{}
%\penguin[eye=red]
%\end{tcblisting}
%\begin{tcblisting}{}
%\penguin[pupil=red]
%\end{tcblisting}
%\begin{tcblisting}{}
%\penguin[bill=red]
%\end{tcblisting}
%\begin{tcblisting}{}
%\penguin[belly=red]
%\end{tcblisting}
%\begin{tcblisting}{}
%\penguin[feet=red]
%\end{tcblisting}
%
%To view the penguin from behind:
%\begin{tcblisting}{}
%\penguin[back]
%\end{tcblisting}
%
%The key \lstinline|3D| will make the penguin 3-dimensional:
%\begin{tcblisting}{}
%\penguin[3D]
%\end{tcblisting}
%
%And finally the \lstinline|contour| key will only draw the outlines:
%\begin{tcblisting}{}
%\penguin[contour=black]
%\end{tcblisting}