Fill style that looks like hand-drawn / hand-filled with crayon

Question

How to generate in LaTeX (TikZ or something similar) the following image:

This was not drawn by hand, as far as I known, but with some Mac tool.

Answer 1

Here is a quick one: I've used the decoration that Forkrul Assail linked to and basically it's going back and forth between the corners just as you would do to hatch. However it's not really following the outer contour and you can make it more detailed if you define this as a genuine decoration following precisely the shape border. I didn't do it because I think Inkscape or something similar is much easier to perform this and I doubt that it is worth automating. Nevertheless the idea is essentially the same for the decoration anyhow.

Also much to my surprise the line join option is really showing a difference.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{shapes.geometric,calc,positioning,decorations}

\makeatletter
\pgfdeclaredecoration{penciline}{initial}{
    \state{initial}[width=+\pgfdecoratedinputsegmentremainingdistance,auto corner on length=1mm,]{
        \pgfpathcurveto%
        {% From
            \pgfqpoint{\pgfdecoratedinputsegmentremainingdistance}
                            {\pgfdecorationsegmentamplitude}
        }
        {%  Control 1
        \pgfmathrand
        \pgfpointadd{\pgfqpoint{\pgfdecoratedinputsegmentremainingdistance}{0pt}}
                        {\pgfqpoint{-\pgfdecorationsegmentaspect\pgfdecoratedinputsegmentremainingdistance}%
                                        {\pgfmathresult\pgfdecorationsegmentamplitude}
                        }
        }
        {%TO 
        \pgfpointadd{\pgfpointdecoratedinputsegmentlast}{\pgfpoint{1pt}{1pt}}
        }
    }
    \state{final}{}
}
\makeatother

\begin{document}
\begin{tikzpicture}[decoration={penciline,amplitude=2pt}]
\node[regular polygon,regular polygon sides=3,minimum height=2cm,draw] (a) {};
\node[below= 0.5cm of a] {\textsc{Working Copy}};
\draw[blue,opacity=0.3,decorate,line width=1mm,line join=round] (a.corner 3)
\foreach \x[remember=\x as \lastx(initially 0)] in {0.07,0.15,...,1.1}{
 -- ($(a.corner 1)!\lastx!(a.corner 2)$) --($(a.corner 3)!\lastx+0.05!(a.corner 2)$)
}--(a.corner 2);

\node[cylinder, shape border rotate=90, aspect = 0.65,draw,
        minimum height=1.7cm,minimum width=1.5cm] (b) at (4cm,0.2cm) {};
\node[below= 0.45cm of b] {\textsc{Copying Work}};
\draw[red,opacity=0.3,decorate,line width=0.9mm,line join=bevel] (b.after top)
\foreach \x[remember=\x as \lastx(initially 0)] in {0.1,0.2,...,1.1}{
 -- ($(b.after top)!\lastx!(b.before bottom)$) --($(b.after top)!\lastx+0.05!(b.before top)$)
} --(b.before bottom) 
\foreach \x[remember=\x as \lastx(initially 0)] in {0.1,0.2,...,1.1}{
 -- ($(b.before bottom)!\lastx!(b.after bottom)$) -- ($(b.before top)!\lastx+0.05!(b.after bottom)$)
};
\end{tikzpicture}
\end{document}

Answer 2

I think for this one idea should be create a custom pattern, but my solution is far from being good. Indeed I remember having read somewhere that paths are evils and today I discover why: bit modifications of the parameters lead to very different outputs. To have something a bit stable, one could set the seed by means of:

\pgfmathsetseed{<some value>}

As starting point I used custom and built in tikz fill patterns.

The code:

\documentclass{article}
% for the font
\renewcommand*\sfdefault{augie} 
\renewcommand*\familydefault{\sfdefault}
\usepackage{tikz}
\usetikzlibrary{positioning,patterns,shapes.geometric}

% defining the new dimensions
\newlength{\hatchspread}
\newlength{\hatchthickness}
% declaring the keys in tikz
\tikzset{hatchspread/.code={\setlength{\hatchspread}{#1}},
         hatchthickness/.code={\setlength{\hatchthickness}{#1}}}
% setting the default values
\tikzset{hatchspread=3pt,
         hatchthickness=0.4pt}
% declaring the pattern
\pgfdeclarepatternformonly[\hatchspread,\hatchthickness]% variables
   {custom north west lines}% name
   {\pgfqpoint{-2\hatchthickness}{-2\hatchthickness}}% lower left corner
   {\pgfqpoint{\dimexpr\hatchspread+2\hatchthickness}{\dimexpr\hatchspread+2\hatchthickness}}% upper right corner
   {\pgfpoint{\hatchspread}{\hatchspread}}% tile size
   {% shape description
    \pgfsetlinewidth{\hatchthickness*rand}
    \pgfpathmoveto{\pgfpoint{rand*0.2pt}{\hatchspread}}
   \pgfpathcurveto
{\pgfqpoint{\dimexpr\hatchspread+6pt}{0.2pt}}{\pgfpoint{\hatchspread+4pt}{rand*3pt}}{\pgfqpoint{\dimexpr\hatchspread+0.1pt}{0.15pt}}
    \pgfsetstrokeopacity{0.175}
    \pgfsetstrokecolor{blue}
    \pgfusepath{stroke}
   }

\begin{document}
\pgfmathsetseed{123564} % to have always the same result
\begin{tikzpicture}
\node[draw,cylinder,scale=8,rotate=90,aspect=0.25, pattern= custom north west lines, ,hatchspread=6.2pt,hatchthickness=17pt] at (0,-3){};
\node at (0,-4.5) {\textsc{Repository}};

\node[draw,regular polygon,regular polygon sides=3, scale=4.25, yshift=-0.02cm,
pattern= custom north west lines, ,hatchspread=6.2pt,hatchthickness=17pt] at (5,-3){};
\node at (5,-4.5) {\textsc{Working Copy}};

\end{tikzpicture}%


\end{document}

and the result is:

BTW: If one needs to fill something with almost roof tiles, here's a code to do that:

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{calc,decorations.pathmorphing,patterns,shapes.geometric}

% To draw tiles
% defining the new dimensions
\newlength{\hatchspread}
\newlength{\hatchthickness}
% declaring the keys in tikz
\tikzset{hatchspread/.code=\setlength{\hatchspread}{#1},
         hatchthickness/.code=\setlength{\hatchthickness}{#1},
         hatchspread=3pt,hatchthickness=0.4pt}
% declaring the pattern
\pgfdeclarepatternformonly[\hatchspread,\hatchthickness]% variables
   {custom north west lines}% name
   {\pgfqpoint{-2\hatchthickness}{-2\hatchthickness}}% lower left corner
   {\pgfqpoint{\dimexpr\hatchspread+2\hatchthickness}{\dimexpr\hatchspread+2\hatchthickness}}% upper right corner
   {\pgfpoint{\hatchspread}{\hatchspread}}% tile size
   {% shape description
    \pgfsetlinewidth{\hatchthickness*rand}
    \pgfpathmoveto{\pgfpoint{rand*0.2pt}{\hatchspread}}
   \pgfpathcurveto
{\pgfqpoint{\dimexpr\hatchspread+3pt}{0.2pt}}{\pgfpoint{\hatchspread+2pt}{20pt}}{\pgfqpoint{\dimexpr\hatchspread+0.15pt}{0.15pt}}
    \pgfsetstrokeopacity{0.5}
    \pgfusepath{stroke}
   }       

\begin{document}
\pgfmathsetseed{123561} % to have always the same result
\begin{tikzpicture}
\node[draw,trapezium,scale=9, pattern= custom north west lines,hatchspread=6pt,hatchthickness=9pt] (s) at (0,-3){};
\end{tikzpicture}%
\end{document}

The output:

---

Just for fun (and for fans of hand drawns):

\documentclass{article}

\usepackage{tikz}
\usetikzlibrary{backgrounds,calc,decorations,decorations.pathmorphing,patterns,shapes.geometric}

\makeatletter
\pgfdeclaredecoration{penciline}{initial}{
    \state{initial}[width=+\pgfdecoratedinputsegmentremainingdistance,auto corner on length=1mm,]{
        \pgfpathcurveto%
        {% From
            \pgfqpoint{\pgfdecoratedinputsegmentremainingdistance}
                            {\pgfdecorationsegmentamplitude}
        }
        {%  Control 1
        \pgfmathrand
        \pgfpointadd{\pgfqpoint{\pgfdecoratedinputsegmentremainingdistance}{0pt}}
                        {\pgfqpoint{-\pgfdecorationsegmentaspect\pgfdecoratedinputsegmentremainingdistance}%
                                        {\pgfmathresult\pgfdecorationsegmentamplitude}
                        }
        }
        {%TO 
        \pgfpointadd{\pgfpointdecoratedinputsegmentlast}{\pgfpoint{1pt}{1pt}}
        }
    }
    \state{final}{}
}
\makeatother


% To draw tiles
% defining the new dimensions
\newlength{\hatchspread}
\newlength{\hatchthickness}
% declaring the keys in tikz
\tikzset{hatchspread/.code=\setlength{\hatchspread}{#1},
         hatchthickness/.code=\setlength{\hatchthickness}{#1},
         hatchspread=3pt,hatchthickness=0.4pt}
% declaring the pattern
\pgfdeclarepatternformonly[\hatchspread,\hatchthickness]% variables
   {custom north west lines}% name
   {\pgfqpoint{-2\hatchthickness}{-2\hatchthickness}}% lower left corner
   {\pgfqpoint{\dimexpr\hatchspread+2\hatchthickness}{\dimexpr\hatchspread+2\hatchthickness}}% upper right corner
   {\pgfpoint{\hatchspread}{\hatchspread}}% tile size
   {% shape description
    \pgfsetlinewidth{\hatchthickness*rand}
    \pgfpathmoveto{\pgfpoint{rand*0.2pt}{\hatchspread}}
   \pgfpathcurveto
{\pgfqpoint{\dimexpr\hatchspread+3pt}{0.2pt}}{\pgfpoint{\hatchspread+2pt}{20pt}}{\pgfqpoint{\dimexpr\hatchspread+0.15pt}{0.15pt}}
    \pgfsetstrokeopacity{0.5}
    \pgfusepath{stroke}
   }

\tikzset{window/.style={
        draw, fill=cyan!20,
        rectangle, minimum size=8bp,
        decorate, decoration=penciline,
        append after command={
            [shorten >=1.5\pgflinewidth, shorten <=1.5\pgflinewidth,]           
        (\tikzlastnode.north) edge[decorate, decoration=penciline] (\tikzlastnode.south)
        (\tikzlastnode.east) edge[decorate, decoration=penciline] (\tikzlastnode.west)
        }
    }
}


\begin{document}
\pgfmathsetseed{123561}
\begin{tikzpicture}
\node[draw,trapezium,scale=5, 
    decorate, decoration=penciline,
    pattern= custom north west lines,
    hatchspread=6pt,hatchthickness=9pt,
    preaction={fill=red!80!black!50}] (s) at (0,0){};

\begin{scope}[on background layer]
\draw[decorate,decoration=penciline,fill=yellow!15] ($(s.bottom left corner)!0.3!(s.south west)$)--++(0,-1.5)--++(2.2,0)--    ($(s.bottom right corner)!0.3!(s.south east)$);
\end{scope}

\draw[decorate,decoration=penciline,fill=brown!50] ([yshift=-1.5cm]$(s.bottom side)!0.3!(s.south west)$)--++(0,0.65)--++(0.4,0)--    ([yshift=-1.4cm]$(s.bottom side)!0.3!(s.south east)$);
\draw[fill=brown] ([yshift=-1.2cm]$(s.bottom side)!0.2!(s.south east)$) circle(1bp);

\node[window,yshift=-0.5cm] at (s.south west) {};
\node[window,yshift=-0.5cm] at (s.south east) {};

\end{tikzpicture}%
\end{document}