% !TeX root = ./examples/koala.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 https://www.latex-project.org/lppl.txt
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ProvidesPackage{tikzlings-koalas}[2025/03/23 version v2.3 Drawing koalas in TikZ]

\RequirePackage{tikz}
\RequirePackage{tikzlings-addons}
\usetikzlibrary{shadows.blur}
\usetikzlibrary{fadings}

\tikzfading[name=koala@blush,inner color=transparent!50,outer color=transparent!100]

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

\newif\ifkoala@blush
\newif\ifkoala@sleeping
\newif\ifkoala@threeD
\newif\ifkoala@back
\newif\ifkoala@contour
\newif\ifkoala@openmouth

\NewHook{tikzlings/koala/background}
\NewHook{tikzlings/koala/belly}
\NewHook{tikzlings/koala/body}
\NewHook{tikzlings/koala/foreground}

\tikzset{
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % Pass unknown keys on to tikz
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 /koala/.search also={/tikz,/pgf,/thing},
 /koala/.cd,
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % body
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 body/.store in     = \koala@body,
 body               = gray!75!white,
 eyes/.store in     = \koala@eyes,
 eyes               = black,
 eye/.forward to    = /koala/eyes,
 mouth/.store in    = \koala@mouth,
 mouth              = \koala@body!40!black,
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % options
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 blush/.code        = \koala@blushtrue
                      \def\koala@blushcolor{#1},
 blush/.default     = red,
 sleeping/.code     = \koala@sleepingtrue,
 openmouth/.code    = \koala@openmouthtrue,
 open mouth/.forward to = /koala/openmouth,
 3D/.code           = \koala@threeDtrue
                      \def\koala@mouth{black},
 back/.code         = \koala@backtrue,
 contour/.code      = \koala@contourtrue
                      \def\koala@contour{#1}
                      \def\koala@blushcolor{#1}
                      \def\koala@mouth{#1},
 contour/.default   = black,
 outline/.forward to = /koala/contour,
}

\def\koala@draw{%
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % minimal bounding box size
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \path (-0.88,0.1) rectangle (0.88, 2.35);
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % 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
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \ifkoala@threeD
   \def\koala@part@draw[##1]{\shade[ball color=##1]}
 \else% 3D
   \ifkoala@contour
     \def\koala@part@draw[##1]{\draw[##1,\koala@contour,fill=white,line width=\scalingfactor*0.4pt]}
   \else% contour
     \def\koala@part@draw[##1]{\fill[##1]}
   \fi% contour
 \fi% 3D
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % Body parts
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \UseHook{tikzlings/koala/background}
 \UseHook{tikzlings/koala/background}
 \csname koalahookbackground\endcsname
 \csname tikzlinghookbackground\endcsname
 %
 % Feet %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \koala@part@draw[\koala@body!50!black] (0.255,0.2) ellipse[x radius=0.23, y radius=0.09];
 \koala@part@draw[\koala@body!50!black] (-0.255,0.2) ellipse[x radius=0.23, y radius=0.09];
 %
 % Ears %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \koala@part@draw[\koala@body] (0.405, 2.1) ellipse[x radius=0.3, y radius=0.23];
 \koala@part@draw[\koala@body] (-0.405, 2.1) ellipse[x radius=0.3, y radius=0.23];
 \unless\ifkoala@back
   \koala@part@draw[\koala@body!40!white] (-0.405, 2.1) ellipse[x radius=0.15, y radius=0.12];
   \koala@part@draw[\koala@body!40!white] (0.405, 2.1) ellipse[x radius=0.15, y radius=0.12];
 \fi% back
 %
 % Arms %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \koala@part@draw[\koala@body] (-0.625,1) ellipse[x radius=0.42, y radius=0.13, rotate=70];
 \koala@part@draw[\koala@body!50!black] (-0.745,0.65) ellipse[x radius=0.12, y radius=0.08, rotate=-20];
 \koala@part@draw[\koala@body] (0.625,1) ellipse[x radius=0.42, y radius=0.13, rotate=-70];
 \koala@part@draw[\koala@body!50!black] (0.745,0.65) ellipse[x radius=0.12, y radius=0.08, rotate=20];
 %
 % Body %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \koala@part@draw[\koala@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\ifkoala@back
   \koala@part@draw[\koala@body!40!white] ( 0.425, 0.71) .. controls ( 0.425, 0.41) and ( 0.255, 0.27) .. ( 0    , 0.27) .. controls (-0.255, 0.27) and (-0.425, 0.41) .. (-0.425, 0.71) .. controls (-0.425, 1.01) and (-0.255, 1.20) .. ( 0    , 1.20) .. controls ( 0.225, 1.20) and ( 0.425, 1.01) .. ( 0.425, 0.71) -- cycle;
 \fi% back
 %
 % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \UseHook{tikzlings/koala/belly}
 \UseHook{tikzlings/koala/belly}
 \csname koalahookbelly\endcsname
 \csname tikzlinghookbelly\endcsname
 %
 % Head %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \koala@part@draw[\koala@body] (0,1.67) ellipse[x radius=0.55, y radius=0.45];
 %
 % Show details only from the front %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \unless\ifkoala@back
   %
   % Nose %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   \koala@part@draw[\koala@body!40!black] (-0.1501, 1.5609) .. controls (-0.1784, 1.4833) and (-0.0827, 1.4108) .. ( 0.0000, 1.4108) .. controls ( 0.0827, 1.4108) and ( 0.1784, 1.4833) .. ( 0.1501, 1.5609) .. controls ( 0.1290, 1.6191) and ( 0.1187, 1.6573) .. ( 0.0750, 1.7010) .. controls ( 0.0336, 1.7424) and (-0.0336, 1.7424) .. (-0.0750, 1.7010) .. controls (-0.1187, 1.6573) and (-0.1290, 1.6191) .. (-0.1501, 1.5609) -- cycle;
   %
   % Eyes %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   \ifkoala@sleeping
     \fill[\koala@body!50!black] (0.2534, 1.675) rectangle ++(0.005, 0.03);
     \fill[\koala@body!50!black,rotate around={20:(0.2925, 1.6925)}] (0.29, 1.68) rectangle ++(0.005, 0.03);
     \fill[\koala@body!50!black,rotate around={-20:(0.2143, 1.6925)}] (0.2168, 1.68) rectangle ++(0.005, 0.03);
     \fill[\koala@body!50!black,rotate around={40:(0.3255, 1.7025)}] (0.323, 1.69) rectangle ++(0.005, 0.03);
     \fill[\koala@body!50!black,rotate around={-40:(0.1813, 1.7025)}] (0.1838, 1.69) rectangle ++(0.005, 0.03);
     \fill[\koala@body!50!black] (-0.2534, 1.675) rectangle ++(-0.005, 0.03);
     \fill[\koala@body!50!black,rotate around={-20:(-0.2925, 1.6925)}] (-0.29, 1.68) rectangle ++(-0.005, 0.03);
     \fill[\koala@body!50!black,rotate around={20:(-0.2143, 1.6925)}] (-0.2168, 1.68) rectangle ++(-0.005, 0.03);
     \fill[\koala@body!50!black,rotate around={-40:(-0.3255, 1.7025)}] (-0.323, 1.69) rectangle ++(-0.005, 0.03);
     \fill[\koala@body!50!black,rotate around={40:(-0.1813, 1.7025)}] (-0.1838, 1.69) rectangle ++(-0.005, 0.03);
     \fill[\koala@body!50!black, even odd rule] (0.3331, 1.741) ..  controls (0.3331, 1.685) and (0.1737, 1.685) .. (0.1737, 1.741) .. controls (0.1737, 1.848) and (0.3331, 1.848) .. (0.3331, 1.741) -- cycle (0.328, 1.741) .. controls   (0.323, 1.705) and   (0.184, 1.705) .. (0.179, 1.741) .. controls   (0.184, 1.843) and   (0.323, 1.843) .. (0.328, 1.741) -- cycle;
     \fill[\koala@body!50!black, even odd rule] (-0.3331, 1.741) ..  controls (-0.3331, 1.685) and (-0.1737, 1.685) .. (-0.1737, 1.741) .. controls (-0.1737, 1.848) and (-0.3331, 1.848) .. (-0.3331, 1.741) -- cycle   (-0.328, 1.741) .. controls     (-0.323, 1.705) and     (-0.184, 1.705) ..     (-0.179, 1.741) .. controls (-0.184, 1.843) and (-0.323, 1.843) .. (-0.328, 1.741) -- cycle;
   \else% sleeping
     \koala@part@draw[\koala@eyes] (-0.255, 1.74) circle[radius=0.08];
     \koala@part@draw[\koala@eyes] (0.255, 1.74) circle[radius=0.08];
     \fill[white] (-0.27, 1.76) circle[radius=0.015];
     \fill[white] (0.24, 1.76) circle[radius=0.015];
   \fi% sleeping
   %
   % Mouth %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   \ifkoala@openmouth
     \filldraw[\koala@mouth,line width=\scalingfactor*0.4pt] (0.115, 1.39) arc [start angle=-40, end angle=-140, radius=0.16];
   \else
     \draw[\koala@mouth,line width=\scalingfactor*0.4pt] (0.115, 1.39) arc [start angle=-40, end angle=-140, radius=0.16];
   \fi
   %
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   %
   % optional
   %
   %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   %
   % Blushed %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
   \ifkoala@blush
     \fill[\koala@blushcolor,path fading=koala@blush] (-0.3, 1.52) circle[radius=0.1];
     \fill[\koala@blushcolor,path fading=koala@blush] (0.3, 1.52) circle[radius=0.1];
   \fi% blush
   %
 \fi% back
 %
 % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \UseHook{tikzlings/koala/body}
 \UseHook{tikzlings/koala/body}
 \csname koalahookbody\endcsname
 \csname tikzlinghookbody\endcsname
 %
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% Documentation
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\clearpage
%\section[Koala]{Will, the koala}
%
%\emph{The koala was generously contributed by @marmot and is named in honour of a \LaTeX{} developer from Down Under}
%
%\subsection{Package name}
%
%\begin{tcolorbox}[title={Package usage}]
%\begin{samcode}
%\usepackage{tikzlings-koalas}
%\end{samcode}
%\end{tcolorbox}
%
%\subsection{Basic Usage}
%
%\begin{tcblisting}{title={Basic koala}}
%\koala
%\end{tcblisting}
%
%\subsection{Options}
%
%The basic koala can be modified by changing its colour:
%\begin{tcblisting}{title={Body colour}}
%\koala[body=blue]
%\end{tcblisting}
%
%In addition to the colour of the body, the colour of various body parts can be adjusted:
%\begin{tcblisting}{title={Eye colour}}
%\koala[eyes=red]
%\end{tcblisting}
%\begin{tcblisting}{title={Mouth colour}}
%\koala[mouth=red]
%\end{tcblisting}
%
% The koala can open its mouth:
%\begin{tcblisting}{title={Open mouth}}
%\koala[openmouth]
%\end{tcblisting}
%
%It can also blush
%\begin{tcblisting}{title={Blushing koala}}
%\koala[blush=red]
%\end{tcblisting}
%
%and if tired, it is going to take a nap:
%\begin{tcblisting}{title={Sleep}}
%\koala[sleeping]
%\end{tcblisting}
%
%To view the koala from behind:
%\begin{tcblisting}{title={Back view}}
%\koala[back]
%\end{tcblisting}
%
%The key \saminline|3D| will make the koala 3-dimensional:
%\begin{tcblisting}{title={3D view}}
%\koala[3D]
%\end{tcblisting}
%
%And finally the \saminline|contour| key will only draw the outlines:
%\begin{tcblisting}{title={Contours}}
%\koala[contour=black]
%\end{tcblisting}

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