Customize diameter of a circle around numbers

Question

The following code gives one good solution for displaying numbers in cricle but it would be better to have the possibility to control the size of the circle. Why ? In the example below you will see that the three numbers in circle do not look pretty when they are ine the same context : in the same paragraph or in one list like in the following code.

So I would like to us the first optional argument so as to do the following things :

1. If the first optional argument is 0, then the diameter of the circle is the current automatic one.
2. If the first optional argument is one natural number n <> 0, then the diameter of the circle is n times one character width.
3. In other case, one error must be raised.

Here is the code to modify...

% Source : http://tex.stackexchange.com/questions/7032/good-way-to-make-pgftextcircled-numbers

\documentclass{article}
    \usepackage{enumitem}
    \usepackage{tikz}

    \newcommand{\pgftextcircled}[2][0]{
        \setbox0=\hbox{#2}%
        \dimen0\wd0%
        \divide\dimen0 by 2%
        \begin{tikzpicture}[baseline=(a.base)]%
            \useasboundingbox (-\the\dimen0,0pt) rectangle (\the\dimen0,1pt);
            \node[
                circle,
                draw,
                outer sep=0pt,
                inner sep=0.1ex
            ] (a) {#2};
        \end{tikzpicture}
    }

\begin{document}

\begin{description}
    \item[Automatic width :] \pgftextcircled{0} , \pgftextcircled{63} , \pgftextcircled{733}
    \item[Width = 2 :]       \pgftextcircled[2]{0} , \pgftextcircled[2]{63} , \pgftextcircled[2]{733}
    \item[Width = 3 :]       \pgftextcircled[3]{0} , \pgftextcircled[3]{63} , \pgftextcircled[3]{733}
\end{description}

Lets' try in one list :

\begin{enumerate}[label=\protect{\pgftextcircled[2]{\arabic*}}]
    \item Item n°1
    \item Item n°2
    \item Item n°3
    \item Item n°4
    \item Item n°5
    \item Item n°6
    \item Item n°7
    \item Item n°8
    \item Item n°9
    \item Item n°10
    \item Item n°11
    \item Item n°12
\end{enumerate}

\end{document}

Answer 1

Try this, for example:

\documentclass{article}
\usepackage{enumitem}
\usepackage{tikz}
\newbox\nodebox
\newcommand\pgftextcircled[2][0]{%
    \ifnum#1=0 \setbox\nodebox\hbox{#2}%
    \else \setbox\nodebox\hbox{0}\wd\nodebox\dimexpr\wd\nodebox*#1\relax
    \fi
    \begin{tikzpicture}[baseline=(a.base)]%
        \node[draw,circle,outer sep=0pt,inner sep=0.5pt](a){\hbox to\wd\nodebox{\hss#2\hss}};
    \end{tikzpicture}%
}

\begin{document}

\begin{description}
    \item[Automatic width :] \pgftextcircled{1} , \pgftextcircled{63} , \pgftextcircled{733}
    \item[Width = 2 :]       \pgftextcircled[2]{0} , \pgftextcircled[2]{63} , \pgftextcircled[2]{733}
    \item[Width = 3 :]       \pgftextcircled[3]{0} , \pgftextcircled[3]{63} , \pgftextcircled[3]{733}
\end{description}

\begin{enumerate}[label=\protect{\pgftextcircled[2]{\arabic*}}]
    \item Item n°1
    \item Item n°2
    \item Item n°3
    \item Item n°4
    \item Item n°5
    \item Item n°6
    \item Item n°7
    \item Item n°8
    \item Item n°9
    \item Item n°10
    \item Item n°11
    \item Item n°12
\end{enumerate}
\end{document}