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