% !TeX root = ./examples/owl.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-owls}[2025/03/23 version v2.3 Draw owls in TikZ]

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

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

\newif\ifowl@threeD
\newif\ifowl@back
\newif\ifowl@contour

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

\tikzset{
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % Pass unknown keys on to tikz
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 /owl/.search also={/tikz,/pgf,/thing},
 /owl/.cd,
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % body
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 body/.store in     = \owl@body,
 body               = brown!70!black,
 eyes/.store in     = \owl@eyes,
 eyes               = white!90!gray,
 eye/.forward to    = /owl/eyes,
 pupils/.store in   = \owl@pupils,
 pupils             = brown!30!black,
 pupil/.forward to  = /owl/pupils,
 bill/.store in     = \owl@bill,
 bill               = orange,
 feet/.store in     = \owl@feet,
 feet               = orange,
 foot/.forward to   = /owl/feet,
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % options
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 3D/.code           = \owl@threeDtrue,
 back/.code         = \owl@backtrue,
 contour/.code      = \owl@contourtrue
                      \def\owl@contour{#1},
 contour/.default   = black,
 outline/.forward to = /owl/contour,
}

\def\owl@draw{%
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % minimal bounding box size
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \path (-0.73, 0.08) rectangle (0.73, 2.24);
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % 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
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \ifowl@threeD
   \def\owl@part@draw[##1]{\shade[ball color=##1]}
 \else% 3D
   \ifowl@contour
     \def\owl@part@draw[##1]{\draw[##1,\owl@contour,fill=white,line width=\scalingfactor*0.4pt]}
   \else% contour
     \def\owl@part@draw[##1]{\fill[##1]}
   \fi% contour
 \fi% 3D
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % Body parts
 %
 %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 %
 % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \UseHook{tikzlings/owl/background}
 \UseHook{tikzlings/background}
 \csname owlhookbackground\endcsname
 \csname tikzlinghookbackground\endcsname
 %
 % Arms %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \owl@part@draw[\owl@body] (0.575,0.8) ellipse[x radius=0.38, y radius=0.1, rotate=-80];
 \owl@part@draw[\owl@body] (-0.575,0.8) ellipse[x radius=0.38, y radius=0.1, rotate=80];
 %
 % Feet if back %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \ifowl@back
   \owl@part@draw[\owl@feet] (0.175,0.2) ellipse[x radius=0.03, y radius=0.1];
   \owl@part@draw[\owl@feet] (0.225,0.21) ellipse[x radius=0.03, y radius=0.1, rotate=20];
   \owl@part@draw[\owl@feet] (0.275,0.23) ellipse[x radius=0.03, y radius=0.1, rotate=40];
   \owl@part@draw[\owl@feet] (-0.175,0.2) ellipse[x radius=0.03, y radius=0.1];
   \owl@part@draw[\owl@feet] (-0.225,0.21) ellipse[x radius=0.03, y radius=0.1, rotate=-20];
   \owl@part@draw[\owl@feet] (-0.275,0.23) ellipse[x radius=0.03, y radius=0.1, rotate=-40];
 \fi% back
 %
 % Body %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \owl@part@draw[\owl@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;
 %
 % Ears %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \owl@part@draw[\owl@body] (-0.6361, 1.777) .. controls   (-0.6361, 1.777) and   (-0.7586, 1.9603) ..   (-0.6759, 2.2145) .. controls   (-0.3248, 1.912) and   (0.3248, 1.912) ..   (0.6759, 2.2145) .. controls   (0.7586, 1.9603) and   (0.6361, 1.777) ..   (0.6361, 1.777);
 %
 % Belly %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \unless\ifowl@back
   \owl@part@draw[\owl@body!50!white] (0.425,0.5) .. controls (0.425,0.31) and (0.245,0.27) .. (0,0.27) .. controls (-0.245,0.27) and (-0.425,0.31) .. (-0.425,0.5) .. controls (-0.425,0.81) and (-0.225,0.98) .. (0,0.98) .. controls (0.225,0.98) and (0.425,0.81) .. (0.425,0.5) -- cycle;
 \fi% back
 %
 % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \UseHook{tikzlings/owl/belly}
 \UseHook{tikzlings/belly}
 \csname owlhookbelly\endcsname
 \csname tikzlinghookbelly\endcsname
 %
 % head %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \owl@part@draw[\owl@body] (0,1.55) ellipse[x radius=0.7, y radius=0.55];
 %
 % Eyes %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \unless\ifowl@back
   \ifowl@contour
     \owl@part@draw[\owl@eyes] (-0.28, 1.6) circle[radius=0.22];
     \owl@part@draw[\owl@eyes] (0.28, 1.6) circle[radius=0.22];
   \else% contour
     \fill[\owl@eyes] (-0.28, 1.6) circle[radius=0.22];
     \fill[\owl@eyes] (0.28, 1.6) circle[radius=0.22];
   \fi% contour
   \owl@part@draw[\owl@pupils]   (-0.28, 1.6) circle[radius=0.15];
   \owl@part@draw[\owl@pupils]   (0.28, 1.6) circle[radius=0.15];
   \owl@part@draw[white] (0.25, 1.64) circle[radius=0.03];
   \owl@part@draw[white] (-0.31, 1.64) circle[radius=0.03];
 \fi% back
 %
 % Bill %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \unless\ifowl@back
   \owl@part@draw[\owl@bill] (0, 1.4) -- (-0.1, 1.3) -- (0, 1.15) -- (0.1, 1.3) -- cycle;
 \fi% back
 %
 % Feet %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \unless\ifowl@back
   \owl@part@draw[\owl@feet] (0.175,0.2) ellipse[x radius=0.03, y radius=0.1];
   \owl@part@draw[\owl@feet] (0.225,0.21) ellipse[x radius=0.03, y radius=0.1, rotate=20];
   \owl@part@draw[\owl@feet] (0.275,0.23) ellipse[x radius=0.03, y radius=0.1, rotate=40];
   \owl@part@draw[\owl@feet] (-0.175,0.2) ellipse[x radius=0.03, y radius=0.1];
   \owl@part@draw[\owl@feet] (-0.225,0.21) ellipse[x radius=0.03, y radius=0.1, rotate=-20];
   \owl@part@draw[\owl@feet] (-0.275,0.23) ellipse[x radius=0.03, y radius=0.1, rotate=-40];
 \fi% back
 %
 % adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
 \UseHook{tikzlings/owl/body}
 \UseHook{tikzlings/body}
 \csname owlhookbody\endcsname
 \csname tikzlinghookbody\endcsname
 %
}

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%%
%% Documentation
%%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%\clearpage
%\section[Owl]{Jake, the owl}
%
%\emph{The owl Jake was inspired by the avatar of one of the world's top TikZperts}
%
%\subsection{Package name}
%
%\begin{tcolorbox}[title={Package usage}]
%\begin{samcode}
%\usepackage{tikzlings-owls}
%\end{samcode}
%\end{tcolorbox}
%
%\subsection{Basic Usage}
%
%\begin{tcblisting}{title={Basic owl}}
%\owl
%\end{tcblisting}
%
%\subsection{Options}
%
%The basic owl can be modified by changing its colour:
%\begin{tcblisting}{title={Body colour}}
%\owl[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}}
%\owl[eyes=red]
%\end{tcblisting}
%\begin{tcblisting}{title={Pupil colour}}
%\owl[pupils=red]
%\end{tcblisting}
%\begin{tcblisting}{title={Bill colour}}
%\owl[bill=red]
%\end{tcblisting}
%\begin{tcblisting}{title={Foot colour}}
%\owl[feet=red]
%\end{tcblisting}
%
%To view the owl from behind:
%\begin{tcblisting}{title={Back view}}
%\owl[back]
%\end{tcblisting}
%
%The key \saminline|3D| will make the owl 3-dimensional:
%\begin{tcblisting}{title={3D view}}
%\owl[3D]
%\end{tcblisting}
%
%And finally the \saminline|contour| key will only draw the outlines:
%\begin{tcblisting}{title={Contours}}
%\owl[contour=black]
%\end{tcblisting}

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