6

I am drawing a digraph to represent a matrix.

\begin{figure}
\begin{tikzpicture}[roundnode/.style={circle, draw=black!60, fill=black!5, very thick, minimum size=7mm}]
%Nodes
\node[roundnode]      (midcircle)                              {2};
\node[roundnode]      (uppercircle)       [above=of midcircle] {1};
\node[roundnode]      (rightcircle)       [right=of midcircle] {4};
\node[roundnode]      (lowercircle)       [below=of midcircle] {3};

%Edges out of 1
\draw[->] (uppercircle.east) -- (rightcircle.north);
\draw[->] (uppercircle.west) .. controls+(left:40mm) .. (lowercircle.west);
\draw[->] (uppercircle.west) .. controls +(up:20mm) and +(right:7mm) .. (uppercircle.east);

%2 Edges out of 2
\draw[->] (midcircle.east) -- (rightcircle.west);
\draw[->] (midcircle.north) .. controls +(up:5mm) and +(right:7mm) .. (midcircle.east);
\draw[->] (midcircle.south) -- (lowercircle.north);
\draw[->] (midcircle.north) -- (uppercircle.south);

%Edges out of 3
\draw[->] (lowercircle.west) .. controls+(left:50mm) and +(up:10mm) .. (uppercircle.west);
\draw[->] (lowercircle.east) -- (rightcircle.south);
\draw[->] (lowercircle.south) .. controls +(right:7mm) ..  (lowercircle.east);


%Edges out of 4
\draw[->] (rightcircle.south) .. controls +(down:7mm) and +(right:7mm) .. (midcircle.east);

\end{tikzpicture}
\end{figure}

This produces

Digraph

  1. I would like to know how to label edges with simply + or -
  2. I would like to make prettier edges, that do not intersect, and are more symmetrical. I am not sure if using controls command is the best approach. It may also work better to have edges leaving and entering not on north, south, east, or west. Any suggestions of better methods?
6

Here is the automaton drawn with the automata library. I have labeled all edges with letters to make it easier to identify them in the code, but of course you can also use something like node{\texttt{+}} or node{$+$}.

enter image description here

\documentclass[border=2mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{automata,positioning}
\begin{document}
\begin{tikzpicture}%
  [>=stealth,
   shorten >=1pt,
   node distance=2cm,
   on grid,
   auto,
   every state/.style={draw=black!60, fill=black!5, very thick}
  ]
\node[state] (mid)                  {2};
\node[state] (upper) [above=of mid] {1};
\node[state] (right) [right=of mid] {4};
\node[state] (lower) [below=of mid] {3};

\path[->]
%   FROM       BEND/LOOP           POSITION OF LABEL   LABEL   TO
   (upper) edge[bend left]     node                      {a} (right)
           edge[bend right=80] node[swap,very near start]{b} (lower)
           edge[loop above]    node                      {c} (upper)
   (mid)   edge[bend left=10]  node                      {d} (right)
           edge[loop left]     node                      {e} (mid)
           edge                node                      {f} (lower)
           edge                node                      {g} (upper)
   (lower) edge[bend left=70]  node[swap,very near start]{h} (upper)
           edge[bend right]    node[swap]                {i} (right)
           edge[loop below]    node                      {j} (lower)
   (right) edge[bend left=10]  node                      {k} (mid)
   ;
\end{tikzpicture}
\end{document}
| improve this answer | |
5

I do not know if I fully understood your question, but here is a solution. Certainly not the best.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{automata,arrows,calc,positioning}

\begin{document}

\begin{figure}
\begin{tikzpicture}[roundnode/.style={circle, draw=black!60, fill=black!5, very thick, minimum size=7mm}]
%Nodes
\node[roundnode]      (midcircle)                              {2};
\node[roundnode]      (uppercircle)       [above=of midcircle] {1};
\node[roundnode]      (rightcircle)       [right=of midcircle] {4};
\node[roundnode]      (lowercircle)       [below=of midcircle] {3};

%Edges out of 1
\draw[->] (uppercircle.east) to[bend left=20] node[above right]{-}(rightcircle.north);
\draw[->] (uppercircle.-135) to[bend right=40] node[right]{-}(lowercircle.135);
\draw[->] (uppercircle.135) to[out=135,in=180] ($(uppercircle) +(0,3em)$)node[above]{+} to[out=0, in =45] (uppercircle.45);

%2 Edges out of 2
\draw[->] (midcircle.east) --node[above]{+} (rightcircle.west);
\draw[->] (midcircle.80) to[out=80,in=135] ($(midcircle) +(2em,2em)$)node[right]{+}  to[out=-45, in =10] (midcircle.10);
\draw[->] (midcircle.south) -- (lowercircle.north);
\draw[->] (midcircle.north) -- (uppercircle.south);

%Edges out of 3
\draw[->] (lowercircle.150) to[bend left=80]node[left]{+}(uppercircle.-150);
\draw[->] (lowercircle.east) to[bend right=20]node[below right]{-}(rightcircle.south);
\draw[->] (lowercircle.-135)  to[out=-135,in=180] ($(lowercircle) +(0,-3em)$)node[below]{+} to[out=0, in =-45](lowercircle.-45);


%Edges out of 4
\draw[->] (rightcircle.-135) to[bend left=20] node[below]{-} (midcircle.-45);

\end{tikzpicture}
\end{figure}

\end{document}

enter image description here

| improve this answer | |
  • Not the worst either! OP should be able to take it from there. – JPi Jan 29 '17 at 18:33

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