Need to draw a cycle in TikZ

Question

I need to draw this:

But I'm not really the best when it comes to TikZ. Could anyone be of assistance?

What have you got so far? If you post the code you've got, especially in the form of a complete, small document, people can help with the bit you are having difficulty with. That way, you'll get better with TikZ ;). — cfr, Dec 06 '15 at 00:29
You might look for nodes and bend edges in the manual (e.g., the example on page 93). — cryingshadow, Dec 06 '15 at 00:40

score 8 · Accepted Answer · answered Dec 06 '15 at 00:43

Well, for startin point (as one of many possible solution) can serve the following MWE:

\documentclass[border=3mm,tikz]{standalone}
    \usetikzlibrary{arrows,automata,positioning}

    \begin{document}
\begin{tikzpicture}[
    node distance=12mm,
    >=stealth, auto,
every state/.style={draw=none, inner sep=0pt}
                ]
\node[state] (q14) {$14$};
\node[state] (q12) [above right=of q14] {$12$};
\node[state] (q23) [below right=of q12] {$23$};
\node[state] (q34) [below right=of q14] {$34$};
    \begin{scope}[bend left]%
\path[->]   (q14) edge node {c} (q12)
            (q12) edge node {c} (q23)
            (q23) edge node {c} (q34)
            (q34) edge node {c} (q14);
    \end{scope}
\end{tikzpicture}

\begin{tikzpicture}[
    node distance=12mm,
    >=stealth, auto,
every state/.style={draw=none}
                ]
\node[state] (q12)                  {$14$};
\node[state] (q24) [below=of q12]   {$34$};
    \begin{scope}[bend left]%
\path[->]   (q12.south east) edge node {c} (q24.north east)
            (q24.north west) edge node {c} (q12.south west);
    \end{scope}
\end{tikzpicture}
    \end{document}

@BlackMild, can be more specific? Answer show two example. In the first arrows mimic circle (but not drawn as arc/circle segment). Do you consider to ask new question? — Zarko, Oct 06 '19 at 14:23
This is small one, so I ask here. In the 1st example, you use [bend left] to draw an not-circuar arc from the node 14 to the node 12. Can we make that arc cỉcular in a simple way? — Black Mild, Oct 06 '19 at 14:49
I have posted a new question.Please have a look at https://tex.stackexchange.com/questions/511183/simple-way-to-make-circular-arrow-arc — Black Mild, Oct 06 '19 at 15:46

score 8 · Answer 2 · answered Dec 06 '15 at 01:24

A little 'Smarts' can draw simple cycles easily:

\documentclass{article}
\usepackage{smartdiagram}
\usesmartdiagramlibrary{additions}
\begin{document}
\smartdiagramadd[circular diagram]{
  Thing 1,Thing 2,Thing 3,Thing 4
}{
  above of module1/a,left of module2/b,below of module3/c,right of module4/d
}
\end{document}

score 6 · Answer 3 · answered Dec 06 '15 at 02:35

For what it's worth, here's how to do the diagram in Asymptote.

% file: foo.tex
% to compile: pdflatex --shell-escape foo
%
% For MikTeX users: Asymptote requires a separate program that cannot be installed
% by the package manager. You can get the installation file from
% https://sourceforge.net/projects/asymptote/files/2.35/
% (specifically, the file ending in setup.exe).

\documentclass{standalone}
\usepackage{asypictureB}
\begin{asyheader}
settings.outformat = "pdf";
\end{asyheader}
\begin{document}
\begin{asypicture}{name=cycles}
import flowchart;
unitsize(1cm);

block northnode = rectangle("$12$", center=N, drawpen=invisible);
block eastnode = rectangle("$23$", center=E, drawpen=invisible);
block southnode = rectangle("$34$", center=S, drawpen=invisible);
block westnode = rectangle("$14$", center=W, drawpen=invisible);

draw(northnode);
draw(eastnode);
draw(southnode);
draw(westnode);

real anglefudge = 10;  // shift 10 degrees away from straight right, down, etc.

add(new void(picture pic, transform t) {
  draw(pic, northnode.right(t) {dir(0-anglefudge)} .. {dir(-90+anglefudge)} eastnode.top(t),
       L=Label("$c$", align=LeftSide),
       arrow=Arrow(TeXHead));
  draw(pic, eastnode.bottom(t) {dir(-90-anglefudge)} .. {dir(180+anglefudge)} southnode.right(t),
       L=Label("$c$", align=LeftSide),
       arrow=Arrow(TeXHead));
  draw(pic, southnode.left(t) {dir(180-anglefudge)} .. {dir(90+anglefudge)} westnode.bottom(t),
       L=Label("$c$", align=LeftSide),
       arrow=Arrow(TeXHead));
  draw(pic, westnode.top(t) {dir(90-anglefudge)} .. {dir(0+anglefudge)} northnode.left(t),
       L=Label("$c$", align=LeftSide),
       arrow=Arrow(TeXHead));
});

currentpicture = shift(-3, 0) * currentpicture;

block topnode = rectangle("$13$", center=(0,1), drawpen=invisible);
block bottomnode = rectangle("$24$", center=(0,-1), drawpen=invisible);

draw(topnode);
draw(bottomnode);

real angleshift = 20;
real positionshift = 0.2;

add(new void(picture pic, transform t) {
  draw(pic,
      topnode.position(0.5+positionshift,t) {dir(-90+angleshift)}
          .. {dir(-90-angleshift)} bottomnode.position(2.5-positionshift,t),
      L=Label("$c$", align=LeftSide),
      arrow=Arrow(TeXHead));
  draw(pic,
      bottomnode.position(2.5+positionshift,t) {dir(90+angleshift)}
          .. {dir(90-angleshift)} topnode.position(0.5-positionshift,t),
      L=Label("$c$", align=LeftSide),
      arrow=Arrow(TeXHead));
});
\end{asypicture}
\end{document}

Need to draw a cycle in TikZ

3 Answers3