tikz-penciline.sty

%% Dimension line for LaTeX/TikZ
%% Copyright © 2013 Sébastien Gross  <seb•ɑƬ•chezwam•ɖɵʈ•org>
%%
%% This file may be distributed and/or modified
%%
%% 1. under the LaTeX Project Public License and/or
%% 2. under the WTF Public License.
%%
%%
%% Simulate naive hand drawing figure.
%%
%%
%% To install it copy the tango directory to either:
%%   - $TEXHOME/tex/latex/
%%   - ~/texmf/tex/latex/
%%   - ~/Library/texmf/tex/latex
%%

\NeedsTeXFormat{LaTeX2e}
\ProvidesPackage{tikz-penciline}[2014/12/18 v1.0 initial version]

\RequirePackage{tikz}
\RequirePackage{ifthen}

\usetikzlibrary{calc,patterns,decorations,plotmarks}
\RequirePackage{pgfplots}

\pgfdeclaredecoration{penciline}{initial}{
  \state{initial}[width=+\pgfdecoratedinputsegmentremainingdistance,
    auto corner on length=\pgfkeysvalueof{/tikz/penciline/auto corner on length},
  ]{
    \ifthenelse
        {\lengthtest{\pgfkeysvalueof{/tikz/penciline/jag ratio}pt = 0pt}} {
          \pgfpathcurveto%
              {% 1st control point
                \pgfpointpolar
                    {(\pgfkeysvalueof{/tikz/penciline/arc angle base1}+
                      \pgfkeysvalueof{/tikz/penciline/arc angle ratio1}*rand)}
                    {(\pgfkeysvalueof{/tikz/penciline/arc radius base1}+
                      \pgfkeysvalueof{/tikz/penciline/arc radius ratio1}*rand)*
                      \pgfdecoratedinputsegmentremainingdistance}
              }
              {%% 2nd control point
                \pgfpointadd
                    {\pgfpointdecoratedinputsegmentlast}
                    {\pgfpointpolar
                      {(\pgfkeysvalueof{/tikz/penciline/arc angle base2}+
                        \pgfkeysvalueof{/tikz/penciline/arc angle ratio2}*rand)}
                      {(\pgfkeysvalueof{/tikz/penciline/arc radius base2}+
                        \pgfkeysvalueof{/tikz/penciline/arc radius ratio2}*rand)*
                        \pgfdecoratedinputsegmentremainingdistance}
                    }
              }
              {% 2nd point (1st one is implicit)
                \pgfpointadd
                    {\pgfpointdecoratedinputsegmentlast}
                    {\pgfpoint
                      {rand*\pgfkeysvalueof{/tikz/penciline/x offset}}
                      {rand*\pgfkeysvalueof{/tikz/penciline/y offset}}}
              }          
        } {
          \pgfpathcurveto%
              {% 1st control point
                \pgfpoint
                    {\pgfdecoratedinputsegmentremainingdistance*
                      (\pgfkeysvalueof{/tikz/penciline/segment x base1}+
                      \pgfkeysvalueof{/tikz/penciline/segment x ratio1}*rnd)}
                    {\pgfkeysvalueof{/tikz/penciline/jag ratio}*
                      rand*\pgfdecorationsegmentamplitude}
              }
              {%% 2nd control point
                \pgfpoint
                %% Make sure random number is always between origin and target points
                    {\pgfdecoratedinputsegmentremainingdistance*
                      (\pgfkeysvalueof{/tikz/penciline/segment x base1}+
                      \pgfkeysvalueof{/tikz/penciline/segment x ratio1}*rnd)}
                    {\pgfkeysvalueof{/tikz/penciline/jag ratio}*
                      rand*\pgfdecorationsegmentamplitude}
              }
              {% 2nd point (1st one is implicit)
                \pgfpointadd
                    {\pgfpointdecoratedinputsegmentlast}
                    {\pgfpoint
                      {rand*\pgfkeysvalueof{/tikz/penciline/x offset}}
                      {rand*\pgfkeysvalueof{/tikz/penciline/y offset}}}
              }
        }
  }
  \state{final}{}
}


\tikzset{
  penciline/.code={\pgfqkeys{/tikz/penciline}{#1}},
  penciline={
    jag ratio/.initial=2,
    decoration/.initial = penciline,
    auto corner on length/.initial=1pt,
    segment x base1/.initial=0.5,
    segment x ratio1/.initial=0.25,
    segment x base2/.initial=0.5,
    segment x ratio2/.initial=0.25,
    arc angle base1/.initial = 20,
    arc angle ratio1/.initial = 10,
    arc radius base1/.initial = 0.3,
    arc radius ratio1/.initial = 0.05,
    arc angle base2/.initial = -90,
    arc angle ratio2/.initial = -10,
    arc radius base2/.initial = 0.7,
    arc radius ratio2/.initial = 0.05,
    x offset/.initial = 1,
    y offset/.initial = 1,
  },
  penciline/.style = {
    decorate,
    penciline/.cd,
    #1,
    /tikz/.cd,
    decoration=penciline
  },
  %% decorate,
}