Improve readability of Pie chart

Question

I have a pie chart that displays percentage numbers in a crowded manner, and I want to improve its readability. Is there a way to do that? especially the way the 6.29% and 1.56% appears

The code is provided

\documentclass[sn-mathphys,Numbered,iicol]{sn-jnl}
\usepackage{tikz}
\input{Pie}
\begin{document}
\begin{figure*}
\centering
\begin{tikzpicture}
[
    pie chart,
    slice type={comet}{blu},
    slice type={legno}{rosso},
    slice type={coltello}{giallo},
    slice type={sedia}{viola},
    slice type={caffe}{verde},
     slice type={C}{gray},
    pie values/.style={font={\small}},
    scale=2
]
\pie[xshift=2.2cm,values of caffe/.style={pos=1.1}]%
    {}{38.57/comet,9.82/legno,37.79/sedia,5.88/C,6.29/caffe,1.56/coltello}




\end{tikzpicture}
\caption{xxxx.}
\label{tabI}
\end{figure*}
\end{document}

Inside Pie code

\usepackage{graphicx}%
\definecolor{rosso}{RGB}{220,57,18}
\definecolor{giallo}{RGB}{255,153,0}
\definecolor{blu}{RGB}{102,140,217}
\definecolor{verde}{RGB}{16,150,24}
\definecolor{viola}{RGB}{153,0,153}
\makeatletter
\tikzstyle{chart}=[
    legend label/.style={font={\scriptsize},anchor=west,align=left},
    legend box/.style={rectangle, draw, minimum size=5pt},
    axis/.style={black,semithick,->},
    axis label/.style={anchor=east,font={\tiny}},
]
\tikzstyle{bar chart}=[
    chart,
    bar width/.code={
        \pgfmathparse{##1/2}
        \global\let\bar@w\pgfmathresult
    },
    bar/.style={very thick, draw=white},
    bar label/.style={font={\bf\small},anchor=north},
    bar value/.style={font={\footnotesize}},
    bar width=.75,
]
\tikzstyle{pie chart}=[
    chart,
    slice/.style={line cap=round, line join=round, very thick,draw=white},
    pie title/.style={font={\bf}},
    slice type/.style 2 args={
        ##1/.style={fill=##2},
        values of ##1/.style={}
    }
]
\pgfdeclarelayer{background}
\pgfdeclarelayer{foreground}
\pgfsetlayers{background,main,foreground}
\newcommand{\pie}[3][]{
    \begin{scope}[#1]
    \pgfmathsetmacro{\curA}{90}
    \pgfmathsetmacro{\r}{1}
    \def\c{(0,0)}
    \node[pie title] at (90:1.3) {#2};
    \foreach \v/\s in{#3}{
        \pgfmathsetmacro{\deltaA}{\v/100*360}
        \pgfmathsetmacro{\nextA}{\curA + \deltaA}
        \pgfmathsetmacro{\midA}{(\curA+\nextA)/2}

        \path[slice,\s] \c
            -- +(\curA:\r)
            arc (\curA:\nextA:\r)
            -- cycle;
        \pgfmathsetmacro{\d}{max((\deltaA * -(.5/50) + 1) , .5)}

        \begin{pgfonlayer}{foreground}
        \path \c -- node[pos=\d,pie values,values of \s]{$\v\%$} +(\midA:\r);
        \end{pgfonlayer}

        \global\let\curA\nextA
    }
    \end{scope}
}

\newcommand{\legend}[2][]{
    \begin{scope}[#1]
    \path
        \foreach \n/\s in {#2}
            {
                  ++(0,-10pt) node[\s,legend box] {} +(5pt,0) node[legend label] {\n}
            }
    ;
    \end{scope}
}

Please never put Overleaf links and instead copy your code here and add a picture of what it produces, and maybe a description of what you want to be modified. — SebGlav, Jul 27 '23 at 15:48
I found several times people citing to "… the only worse design than a pie chart is several of them…" attributed to Edward Tufte, and it is not just a fallacy of authority. There are objetive arguments supporting this. The best way to improve a pie chart ... is not use it. Use a bar chart instead. — Fran, Jul 28 '23 at 09:56
@Fran Or just a simple table. “Save the pies for dessert.” (PDF) — Qrrbrbirlbel, Jul 28 '23 at 14:38

score 2 · Accepted Answer · answered Dec 31 '23 at 14:22

The answer below uses the wheelchart package, which I wrote.

A command \WCtest is defined of which the output depends on whether the percentage is larger than 7. This command is used in the keys data and wheel data. Here, the percentage is obtained with \WCperc.

The gap is obtained with the key gap.

\documentclass[border=6pt]{standalone}
\usepackage{wheelchart}
\definecolor{rosso}{RGB}{220,57,18}
\definecolor{giallo}{RGB}{255,153,0}
\definecolor{blu}{RGB}{102,140,217}
\definecolor{verde}{RGB}{16,150,24}
\definecolor{viola}{RGB}{153,0,153}
\usepackage{siunitx}
\begin{document}
\begin{tikzpicture}
\def\WCtest#1#2{%
    \pgfmathparse{\WCpercentage>7?"#1":"#2"}%
    \pgfmathresult%
}
\wheelchart[
  counterclockwise,
  data=\WCtest{}{\WCperc},
  gap=0.02,
  perc precision=2,
  radius={0}{2.5},
  wheel data=\WCtest{\WCperc}{}
]{%
  38.59/blu/comet,
  9.84/rosso/legno,
  37.81/viola/sedia,
  5.89/gray/C,
  6.30/verde/caffe,
  1.57/giallo/coltello%
}
\end{tikzpicture}
\end{document}

Improve readability of Pie chart

1 Answers1