% !TeX root = ./examples/bear.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-bears}[2021/03/17 version v0.5 Draw teddy bears in TikZ]

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

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

\newif\ifbear@threeD
\newif\ifbear@back
\newif\ifbear@contour

\tikzset{
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % Pass unknown keys on to tikz
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  /bear/.search also={/tikz,/pgf,/thing},
  /bear/.cd,
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % body
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  body/.code         = \def\bear@body{#1},
  body               = brown,
  eye/.code          = \def\bear@eye{#1},
  eye                = \bear@body!30!black,  
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  %
  % options
  %
  %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
  3D/.code           = \bear@threeDtrue, 
  back/.code         = \bear@backtrue,  
  contour/.code      = \bear@contourtrue
                       \def\bear@contour{#1},
  contour/.default   = black,  
  outline/.forward to = /bear/contour,   
}

\def\bear@draw{%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% minimal bounding box size 
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\path (-0.8, 0.0) rectangle (0.8, 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
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ifbear@threeD
  \def\bear@part@draw[##1]{\shade[ball color=##1]}
\else
  \ifbear@contour
    \def\bear@part@draw[##1]{\draw[##1,\bear@contour,fill=white,line width=\scalingfactor*0.4pt]}
  \else
    \def\bear@part@draw[##1]{\fill[##1]}
  \fi
\fi
%
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% Body parts (center: x=0.925)
% 
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%
% adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\csname bearhookbackground\endcsname
\csname tikzlinghookbackground\endcsname
%
% Arms %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\bear@part@draw[\bear@body!70!black] (0.525,0.9) ellipse[x radius=0.35, y radius=0.15, rotate=-50];
\bear@part@draw[\bear@body!70!black] (-0.525,0.9) ellipse[x radius=0.35, y radius=0.15, rotate=50];
%
% Feet if back %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ifbear@back
  \bear@part@draw[\bear@body!70!black] (0.425, 0.3) circle[radius=0.28]; 
  \bear@part@draw[\bear@body!70!black] (-0.425, 0.3) circle[radius=0.28];
\fi
%
% Body %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\bear@part@draw[\bear@body!70!black] (0,0.75) ellipse[x radius=0.55, y radius=0.65]; 
\ifbear@back\else
  \bear@part@draw[\bear@body!50!white] (0,0.7) ellipse[x radius=0.35, y radius=0.4];
\fi 
%
% adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\csname bearhookbelly\endcsname
\csname tikzlinghookbelly\endcsname
%
% Feet %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ifbear@back\else
  \bear@part@draw[\bear@body!70!black] (0.425, 0.3) circle[radius=0.28]; 
  \bear@part@draw[\bear@body!70!black] (-0.425, 0.3) circle[radius=0.28];
  \bear@part@draw[\bear@body!50!white] (0.425, 0.3) circle[radius=0.17]; 
  \bear@part@draw[\bear@body!50!white] (-0.425, 0.3) circle[radius=0.17];
\fi
%
% Ears %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\bear@part@draw[\bear@body!70!black] (0.375, 1.95) circle[radius=0.15];
\bear@part@draw[\bear@body!70!black] (-0.375, 1.95) circle[radius=0.15];
\ifbear@back\else
  \bear@part@draw[\bear@body!50!white] (0.375, 1.95) circle[radius=0.1];
  \bear@part@draw[\bear@body!50!white] (-0.375, 1.95) circle[radius=0.1];
\fi
%
% Head %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\bear@part@draw[\bear@body!70!black] (0, 1.55) circle[radius=0.5]; 
%
% Show details only from the front %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ifbear@back\else
%
% Muzzle %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\bear@part@draw[\bear@body!50!white] (0, 1.4) ellipse[x radius=0.28, y radius=0.2]; 
\bear@part@draw[\bear@body!70!white!80!red] (0, 1.5) ellipse[x radius=0.15, y radius=0.08]; 
%
% Eyes %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\bear@part@draw[\bear@eye] (-0.155, 1.7) circle[radius=0.05]; 
\bear@part@draw[\bear@eye] (0.155, 1.7) circle[radius=0.05]; 
%
% Mouth %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\ifbear@contour
  \draw[\bear@contour,line width=\scalingfactor*0.4pt] (0.145, 1.38) arc [start angle=-20, end angle=-160, radius=0.16];
\else
  \draw[\bear@body!30!black,line width=\scalingfactor*0.4pt] (0.145, 1.38) arc [start angle=-20, end angle=-160, radius=0.16];
\fi
%
\fi
%
% adding hook for users to customise %%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
\csname bearhookbody\endcsname
\csname tikzlinghookbody\endcsname
%
}