\begin{document}
\begin{tikzpicture}
\pie[%
- color={red,violet,teal,blue},
+ color={black!20,black!40,black!60,black!80},
explode={0.1},
hide number,
text=inside,
rotate=45,
radius=1.8,
]{%
- 25/\textcolor{white}{UI},
- 25/\textcolor{white}{Tasks},
+ 25/\textcolor{black}{UI},
+ 25/\textcolor{black}{Tasks},
25/\textcolor{white}{UoD},
- 25/\textcolor{white}{SDS}
+ 25/\textcolor{white}{SDSs}
}
- \node [draw,fill=yellow,circle]{Types};
+ \node [draw,fill=white,circle]{Types};
\end{tikzpicture}
\end{document}