# Parallel tikz lines and node placement (network graph)

I am trying to recreate (the less than pretty) figurebelow

Using the code at the bottom of the post I was able to come up with the following solution

I have some gripes with this solution, which I hope is possible to solve

• Can the three diagonal arrows (The path from A ->- C, B ->- E and D ->- F be parallel?
• I used code from the following question: TikZ: How to draw an arrow in the middle of the line? to create the arrows in the middle. However, this seems like a huge overcomplication, is there an easier solution?
• Similarly defining each node seemed unnecessary can this be done using a loop of some sort?
• Any other solutions on how to recreate the image is more than welcome.

# Code

\documentclass[tikz]{standalone}
\usetikzlibrary{decorations.pathreplacing,
decorations.markings,
positioning}
\tikzset{
% style to apply some styles to each segment of a path
on each segment/.style={
decorate,
decoration={
show path construction,
moveto code={},
lineto code={
\path [#1]
(\tikzinputsegmentfirst) -- (\tikzinputsegmentlast);
},
curveto code={
\path [#1] (\tikzinputsegmentfirst)
.. controls
(\tikzinputsegmentsupporta) and (\tikzinputsegmentsupportb)
..
(\tikzinputsegmentlast);
},
closepath code={
\path [#1]
(\tikzinputsegmentfirst) -- (\tikzinputsegmentlast);
},
},
},
% style to add an arrow in the middle of a path
mid arrow/.style={postaction={decorate,decoration={
markings,
mark=at position .5 with {\arrow[#1]{stealth}}
}}},
}

\usepackage[utf8]{inputenc}

\begin{document}

\begin{tikzpicture}[
every node/.style={draw,circle}]

\node (A) at (0,0) {$A$};
\node[label=above:{$\$\,1$},above right= of A] (B) {$B$}; \node[label=below:{$\$\,2$},below right= of A] (C) {$C$};
\node[label=above:{$\$\,2$},right= of B] (D) {$D$}; \node[label=below:{$\$\,1$},right= of C] (E) {$E$};
\node[above right= of E] (F) {$F$};

\path [draw,postaction={on each segment={mid arrow}}]
(A) -- (B)%
(A) -- (C)%
(B) -- (D)%
(B) -- (E)%
(C) -- (E)%
(D) -- (F)%
(E) -- (F)%
;

\end{tikzpicture}

\end{document}


Draw it as a regular hexagon.

\documentclass[tikz]{standalone}
\usetikzlibrary{decorations.pathreplacing,decorations.markings,positioning}
\tikzset{
mid arrow/.style={draw, postaction={decorate},
decoration={
markings, mark=at position 0.5 with {\arrow{stealth}}}},
every node/.style={draw,circle}}

\begin{document}
\begin{tikzpicture}
\node (F) at (0:2) {$F$};
\node (D) at (60:2) {$D$};
\node (B) at (120:2) {$B$};
\node (A) at (180:2) {$A$};
\node (C) at (240:2) {$C$};
\node (E) at (300:2) {$E$};

\path [mid arrow] (A) -- (B);
\path [mid arrow] (A) -- (C);%
\path [mid arrow] (B) -- (D);%
\path [mid arrow] (B) -- (E);%
\path [mid arrow] (C) -- (E);%
\path [mid arrow] (D) -- (F);%
\path [mid arrow] (E) -- (F);
\end{tikzpicture}
\end{document}


Like this?

Regular polygons (in your case hexagon) has has opposite sides parallel:

\documentclass[tikz, margin=3mm]{standalone}
\usetikzlibrary{decorations.markings,
positioning,
shapes.geometric}

\begin{document}

\begin{tikzpicture}[
node distance = 12mm and 12mm,
vertex/.style = {circle, draw, fill=white, minimum size=1em, inner sep=1pt},
decoration = {markings, mark=at position .5 with {\arrow{stealth}}},
every edge/.style = {draw, postaction={decorate}},
every label/.style = {inner sep=1pt, font=\footnotesize}
]
\node (s) [regular polygon,
regular polygon sides=6,
minimum size=44mm] {}; % coordinates for nodes
\foreach \i/\j [count=\k] in {D/\$\,2,B/\$\,1,A/,C/\$\,2,E/\$\,1,F/} % loop for nodes
\node (v\k) [vertex, label={\k*60}:\j] at (s.corner \k) {$\i$};
\draw  (v1) edge (v2);
\draw  (v2) edge (v3);
\draw  (v3) edge (v4);
\draw  (v4) edge (v5);
\draw  (v5) edge (v6);
\draw  (v6) edge (v1);
%
\draw  (v2) edge (v5);
\end{tikzpicture}
\end{document}


Edit: Edges around polygon you can draw with loop:

\foreach \i in {0,...,5}
{
\pgfmathsetmacro{\j}{int(Mod(\i,6)+1)}
\pgfmathsetmacro{\k}{int(Mod(\i+1,6)+1)}
\draw  (v\j)  edge (v\k);
}


since in your case polygon is hexagon, code isn't much shorter :-) as before.