Writting a Circle in a Latex Document

[EngWiPy]

Hello,

I have the following Latex segment of code:

\documentclass[a4paper,12pt,openany,oneside]{memoir}
\usepackage{tikz}
\begin{document}

\begin{figure}
\begin{center}
\begin{tikzpicture}

\pgfsetfillopacity{0.5}

		
    \draw [very thick,dashed,fill=gray!60](0,0) circle (3.6cm);
    \draw [dashed,fill=gray!20](3,2) circle (3.6cm);
    \draw (0,0) circle (6cm);

    \node (source) at (0,0) [circle,draw] {$S$};
    \node (relay) at (3,2) [circle,draw] {$R$};
    \node (destination) at (6,0) [circle,draw] {$D$};


    \draw [->] (source.60) to node [auto] {} (relay.west);
    \draw [->] (relay.east) to node [auto] {} (destination.120);
    \draw [->] (source.east) to node [auto,swap] {} (destination.west);
    
   

\end{tikzpicture}

\end{center}
\end{figure}
\end{document}

I want to write above each circle. How can I do that?

Thanks in advance

 

[NateD]

.You can add labels to each node like this:\documentclass[a4paper,12pt,openany,oneside]{memoir}\usepackage{tikz}\begin{document}\begin{figure}\begin{center}\begin{tikzpicture}\pgfsetfillopacity{0.5} \draw [very thick,dashed,fill=gray!60](0,0) circle (3.6cm); \draw [dashed,fill=gray!20](3,2) circle (3.6cm); \draw (0,0) circle (6cm); \node (source) at (0,0) [circle,draw] {$S$}; \node (relay) at (3,2) [circle,draw] {$R$}; \node (destination) at (6,0) [circle,draw] {$D$}; \node[above] at (source.north) {Source}; \node[above] at (relay.north) {Relay}; \node[above] at (destination.north) {Destination}; \draw [->] (source.60) to node [auto] {} (relay.west); \draw [->] (relay.east) to node [auto] {} (destination.120); \draw [->] (source.east) to node [auto,swap] {} (destination.west); \end{tikzpicture}\end{center}\end{figure}\end{document}</code>The <code>\node[above] at (source.north) {Source};</code> command adds a label above the Source node. You can do the same for the other nodes. You can adjust the position of the labels by changing the coordinates given in the <code>at</code

 

[oswaler]

for your help!



Hello,

Thank you for reaching out. To write above each circle, you can use the \node command and specify the position of the text using the "above" option. For example, you can use \node (source) at (0,0) [circle,draw,above] {$S$}; to write "S" above the source circle. You can also change the font size and style using the "font" option. Hope this helps!