% Copyright 2008 by Till Tantau % % This file may be distributed and/or modified % % 1. under the LaTeX Project Public License and/or % 2. under the GNU Public License. % % See the file doc/generic/pgf/licenses/LICENSE for more details. \ProvidesFileRCS[v\pgfversion] $Header: /cvsroot/pgf/pgf/generic/pgf/frontendlayer/tikz/libraries/tikzlibraryturtle.code.tex,v 1.3 2008/06/18 23:34:49 tantau Exp $ \tikzset{turtle/.style={/tikz/turtle/.cd,#1}} % The current angle is stored in this key. \tikzset{turtle/direction/.code=\gdef\tikz@lib@turtle@dir{#1},turtle/direction=90} % The current angle is stored in this key. \tikzset{turtle/distance/.initial=1cm} % The to path options that are used to move the turtle \tikzset{turtle/how/.style=} % Let the turtle jump home \tikzset{turtle/home/.style={/tikz/insert path={(0,0) [turtle/direction=90]}}} % Moves the turtle forward by the given distance or, if no distance is % given, by turtle distance \tikzset{ turtle/forward/.default=\pgfkeysvalueof{/tikz/turtle/distance}, turtle/forward/.style={/tikz/insert path={to[/tikz/turtle/how]++(\tikz@lib@turtle@dir:#1)}} } % Moves the turtle backward by the given distance or, if no distance is % given, by turtle distance \tikzset{ turtle/back/.default=\pgfkeysvalueof{/tikz/turtle/distance}, turtle/back/.style={turtle forward=-#1} } % Turns the turle left by the given number of degrees \tikzset{ turtle/left/.default=90, turtle/left/.code={% \pgfmathparse{#1+\tikz@lib@turtle@dir}% \ifdim\pgfmathresult pt>360pt\relax% \pgfmathparse{\pgfmathresult-360}% \fi% \global\let\tikz@lib@turtle@dir\pgfmathresult } } % Turns the turle left by the given number of degrees \tikzset{ turtle/right/.default=90, turtle/right/.code={% \pgfmathparse{#1} \pgfmathparse{\tikz@lib@turtle@dir-\pgfmathresult}% \ifdim\pgfmathresult pt<0pt\relax% \pgfmathparse{\pgfmathresult+360}% \fi% \global\let\tikz@lib@turtle@dir\pgfmathresult } } % Shortcuts: \tikzset{turtle/.cd, fd/.style={forward=#1}, fd/.default=\pgfkeysvalueof{/tikz/turtle/distance}, bk/.style={back=#1}, bk/.default=\pgfkeysvalueof{/tikz/turtle/distance}, lt/.style={left=#1}, lt/.default=90, rt/.style={right=#1}, rt/.default=90} \endinput