Wheel chart

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\documentclass[tikz,border=10pt]{standalone}
\begin{document}
% Adjusts the size of the wheel:
\def\innerradius{1.8cm}
\def\outerradius{2.2cm}
% The main macro
\newcommand{\wheelchart}[1]{
    % Calculate total
    \pgfmathsetmacro{\totalnum}{0}
    \foreach \value/\colour/\name in {#1} {
        \pgfmathparse{\value+\totalnum}
        \global\let\totalnum=\pgfmathresult
    }
    \begin{tikzpicture}
    % The text in the center of the wheel
      \node[align=center,text width=2*\innerradius]{Ratings given by \pgfmathprintnumber{\totalnum}~participants};
      % Calculate the thickness and the middle line of the wheel
      \pgfmathsetmacro{\wheelwidth}{\outerradius-\innerradius}
      \pgfmathsetmacro{\midradius}{(\outerradius+\innerradius)/2}
      % Rotate so we start from the top
      \begin{scope}[line width=\wheelwidth,rotate=90]
      % Loop through each value set. \cumnum keeps track of where we are in the wheel
      \pgfmathsetmacro{\cumnum}{0}
      \foreach \value/\colour/\name in {#1} {
            \pgfmathsetmacro{\newcumnum}{\cumnum + \value/\totalnum*360}
            % Calculate the percent value
            \pgfmathsetmacro{\percentage}{\value/\totalnum*100}
            % Calculate the mid angle of the colour segments to place the labels
            \pgfmathsetmacro{\midangle}{-(\cumnum+\newcumnum)/2}
            % This is necessary for the labels to align nicely
            \pgfmathparse{
               (-\midangle<5?"south":
                (-\midangle<85?"south west":
 
 
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