# Example: Double Arrows a la Chef

Published 2012-11-18 | Author: Dominik Haumann

This example shows how to use double arrows with a very specific type of arrow head. Such double arrows are often used in control theory to distinct vectors from scalars. The title includes the addon “à la Chef” because Professors exist who want these arrows to look exactly like this. :-)

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% Double Arrows a la Chef
% Author: Dominik Haumann
\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows, decorations.markings}

% for double arrows a la chef
% adapt line thickness and line width, if needed
\tikzstyle{vecArrow} = [thick, decoration={markings,mark=at position
1 with {\arrow[semithick]{open triangle 60}}},
double distance=1.4pt, shorten >= 5.5pt,
preaction = {decorate},
postaction = {draw,line width=1.4pt, white,shorten >= 4.5pt}]
\tikzstyle{innerWhite} = [semithick, white,line width=1.4pt, shorten >= 4.5pt]

\begin{document}

\begin{tikzpicture}[thick]
\node[draw,rectangle] (a) {A};
\node[inner sep=0,minimum size=0,right of=a] (k) {}; % invisible node
\node[draw,rectangle,right of=k] (b) {B};
\node[draw,rectangle,below of=a] (c) {C};

% 1st pass: draw arrows
\draw[vecArrow] (a) to (b);
\draw[vecArrow] (k) |- (c);

% 2nd pass: copy all from 1st pass, and replace vecArrow with innerWhite
\draw[innerWhite] (a) to (b);
\draw[innerWhite] (k) |- (c);

% Note: If you have no branches, the 2nd pass is not needed
\end{tikzpicture}

\end{document}


• #1 Schmendrik, July 3, 2013 at 4:13 p.m.

If you ever want to change the color of the arrows, you'll need to use "non-open" triangle decoration and set their fill color accordingly, e.g.:

{\arrow[semithick, fill=blue]{triangle 60}}} 