TikZ: node along decoration

Question

Hopefully a quick question but one I can't get to the bottom of. I'm using the code below to place a curly brace decoration, and though I can place text at it's halfway point I'd like to place on of my previous node objects.

The code is

\draw [thick,decoration={brace},decorate] 
    ([xshift=-0.1cm,yshift=0.2cm]H16.135) to
        node[midway,above] (bracket) {node[circle]}
    ([xshift=0.1cm,yshift=0.2cm]H112.45);

But where I've got node [circle] I'd like it to actually draw a circle node, rather than just display text. Can anyone point me in the right direction?

Many thanks,

Answer 1

To draw a circular node, use

... node[midway,above,draw,circle] (bracket) {node label} ...

The draw key strokes the outline of the node, and circle sets the shape.

A complete, minimal example:

\documentclass[border=3mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
\begin{document}
\begin{tikzpicture}
\node (H16) {};
\node (H112) at (3,0) {};
\draw[thick,decoration={brace},decorate] ([xshift=-0.1cm,yshift=0.2cm]H16.135) to
node[midway,above=1mm,draw,circle] (bracket) {}
([xshift=0.1cm,yshift=0.2cm]H112.45);
\end{tikzpicture}
\end{document}

Answer 2

here is a slightly different code. I removed midway, I used raise and changed the anchors

\documentclass[border=3mm]{standalone}
\usepackage{tikz}
\usetikzlibrary{decorations.pathreplacing}
\begin{document}
\begin{tikzpicture}
\node (H16) {x};
\node (H112) at (3,0) {y};
\draw[thick,decoration={brace,raise=5pt},decorate] 
   (H16.180) to node[above=8pt,draw,circle] {} (H112.0);
\end{tikzpicture}
\end{document}