[Tex/LaTex] Arrow from node back to itself

arrowsnodestikz-pgf

I've tried to follow this question in search for how to draw an Arrow in a nice loop from one node back to itself, but I can't figure out why my code doesn't provide me a loop. In the code below, I want the node with label A to have a loop back to itself.

\documentclass{article}
\usepackage{tikz}
\usetikzlibrary{arrows.meta}
\usetikzlibrary{arrows,shapes,decorations,automata,backgrounds,petri}
\begin{document}

\begin{tikzpicture}

\begin{scope}[every node/.style={circle,thick,draw}]
    \node (A) at (0,3) {A};
    \node (B) at (3,3) {B};
    \node (C) at (6,3) {C};
    \node (D) at (6,0) {D};
    \node (E) at (6,-3) {E};
    \node (F) at (3,-3) {F};
    \node (G) at (0,-3) {G};
    \node (H) at (0,0) {H};
\end{scope}

\begin{scope}[>={Stealth[black]},
              every node/.style={fill=white,circle},
              every edge/.style={draw=black}]

    \path [red,->] (A.90) arc (0:264:4mm) node {$xx$} (A);
    \path [->] (A) edge node {$xx$} (B);
    \path [->] (A) edge[bend left=60] node {$xx$} (C);
    \path [->] (A) edge node {$xx$} (D);
    \path [->] (A) edge node {$xx$} (E);
    \path [->] (A) edge node {$xx$} (F);
    \path [->] (A) edge[bend right=60] node {$xx$} (G);
    \path [->] (A) edge node {$xx$} (H);

\end{scope}

\end{tikzpicture}
\end{document}

As you can see, the arrow doesn't "bend out" of the node..

Best Answer

\path doesn't draw any lines unless you add draw in the options, so you need \path [draw,.., or just \draw instead of \path.

You probably also want to move the node with pos, so have something like

\draw [red,->] (A.90) arc (0:264:4mm) node[pos=0.5,above left] {$xx$} (A);

Related Solutions

[Tex/LaTex] How to define the default vertical distance between nodes

I don't really get the question so I hope this is what you wanted. If you include a full document (such that we copy paste and see the problem on our systems) things are much more easier.

Here, you can change the default setting within a scope but your block style had a node distance which was resetting every time it is issued. I've made it 2mm such that we can see the difference easier.

\documentclass[tikz]{standalone}
\usetikzlibrary{arrows,shapes.geometric,positioning}

\begin{document}
\begin{tikzpicture}[decision/.style={diamond, draw, text width=4.5em, text badly centered, node distance=3.5cm, inner sep=0pt},
                    block/.style   ={rectangle, draw, text width=6em, text centered, rounded corners, minimum height=4em, minimum height=2em},
                    cloud/.style   ={draw, ellipse, minimum height=2em},
                    line/.style    ={draw,-latex'},
                    node distance = 1cm, 
                    auto]
    \node [block] (1st) {1st};
    \node [block, right= of 1st]  (2nd1) {2nd1};
\begin{scope}[node distance=2mm and 10mm]%Here we change it for everything inside this scope
    \node [block, above= of 2nd1] (2nd2) {2nd2};
    \node [block, below= of 2nd1] (2nd3) {2nd3};
    \node [block, right= of 2nd1] (3rd1) {3rd1};
    \node [block, above= of 3rd1] (3rd2) {3rd2};
    \node [block, above= of 3rd2] (3rd3) {3rd3};
\end{scope}
    \node [block, below= of 3rd1] (3rd4) {3rd4};
    \node [block, below= of 3rd4] (3rd5) {3rd5};

    \path [line] (1st) -- (2nd1);
    \path [line] (2nd1) -- (2nd2);
    \path [line] (2nd1) -- (2nd3);
    \path [line] (2nd2) -- (3rd3);
    \path [line] (2nd1) -- (3rd1);
    \path [line] (1st) -- (2nd1);
\end{tikzpicture}
\end{document}

enter image description here

[Tex/LaTex] Draw edge on arc

you say:

drawing an arc alone does not draw arrows and does not end at the "borders" of the nodes, but at there center

(*their center, b.t.w.)

but it is not completely true; you can try with a workaround with arc. For example:

\draw [right, ->] (0.3,8) arc [radius=4, start angle=90, end angle= 0];

will draw an arrow from V1 to almost V2.

Playing around with the radius and the location of the nodes you can draw your circle (with arrows, see the -> above)

EDIT:

to avoid playing around with the starting location you can use node anchors:

\draw [->] (V1.east) arc [radius=4, start angle=90, end angle= 0];

Best Answer

Related Solutions

[Tex/LaTex] How to define the default vertical distance between nodes

[Tex/LaTex] Draw edge on arc

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