After trying to answer this question, and while I am pretty sure multiple things can be improved, the only point that I feel is still missing is the blurred shadow inside the circles and the bar in the picture below.
After searching a bit, it seems that there are no much questions about such internal shadows or border shadows.
Here is what I've come up with so far for the circles, but it is really messy and the result of multiples tweaks.
\documentclass[tikz]{standalone}
\usetikzlibrary{calc,patterns.meta,shadows,shadows.blur}
% Definition of custom colors based on the initial figure of the bar by the OP
\definecolor{myblue}{HTML}{57AED1}
% Definition of custom tikz styles in order to ease readability
\tikzset{
% Node style (Arguments : color, section number)
sectionnode/.style={
fill=#1,
draw=none,
thick,
circle,
text=white,
radius=10pt,
},
shadowed/.style={
preaction={transform canvas={shift={(0.2pt,-0.2pt)}},draw=myblue!50!black},
preaction={transform canvas={shift={(0.4pt,-0.4pt)}},draw=myblue!60!black},
preaction={transform canvas={shift={(0.6pt,-0.6pt)}},draw=myblue!70!black},
preaction={transform canvas={shift={(0.8pt,-0.8pt)}},draw=myblue!80!black},
preaction={transform canvas={shift={(1.0pt,-1.0pt)}},draw=myblue!90!black}},
}
\begin{document}
\begin{tikzpicture}[]
\path[clip] (0,0) circle (9.2pt);
\node[sectionnode=myblue] at (0,0) {1};
\path[shadowed] (0,0) circle (9pt);
\draw[black] (0,0) circle (9pt);
\end{tikzpicture}
\end{document}
I also tried some stuff using the shadows.blur
library, but it does not seem to be possible to use it for this.
So my question is : could someone propose a node
style / path
style that could reproduce this shadow effect without using multiple \path
and or clips.