## Saturday, June 9, 2012

### Pie Chart --- three useful nodes defined by command "\psChart"

The macro \psChart defines for every value three nodes at the half angle and in distances from chartNodeI (default 0.75), 1 and chartNodeO(default 1.25) times of the radius from the origin (chartNodeI and chartNodeO will be discussed in the next post). The nodes are named as psChartInum, psChartnum and psChartOnum, where num is the number of the pie pieces (num have a value between 1 to the numbers of pie pieces, Letter I stands for Inner and O stands for Outer). These nodes will be very usefull when you add labels to the pie pieces. The following shows these nodes visually.

\documentclass{article}
\usepackage{pstricks}
\usepackage{pstricks-add}
\usepackage{pst-plot}
\begin{document}
\begin{pspicture}(-5,-5)(5,5)
\psChart{2,2,3,2}{}{3}
\psdot[linecolor=red](psChart2)
\uput[r](psChart2){\textcolor{red}{psChart2}}
\psdot[linecolor=green](psChartI2)
\uput[r](psChartI2){\textcolor{green}{psChartI2}}
\psdot[linecolor=blue](psChartO2)
\uput[r](psChartO2){\textcolor{blue}{psChartO2}}
\psdot[linecolor=red](psChart3)
\uput[r](psChart3){\textcolor{red}{psChart3}}
\psdot[linecolor=green](psChartI3)
\uput[r](psChartI3){\textcolor{green}{psChartI3}}
\psdot[linecolor=blue](psChartO3)
\uput[r](psChartO3){\textcolor{blue}{psChartO3}}
\end{pspicture}
\end{document}


 Fig.1 Three useful nodes defined by command \psChart.

Files Downloads: tex ps pdf

Now a practical example of plotting a pie chart will be presented.

\documentclass{article}
\usepackage{pstricks}
\usepackage{pstricks-add}
\usepackage{pst-plot}
\begin{document}
\begin{pspicture}(-5,-5)(5,5)
\psChart{5,4,4,3,3}{}{3}
\rput(psChartI1){\textcolor{red}{5}}
\rput(psChartI2){\textcolor{red}{4}}
\rput(psChartI3){\textcolor{red}{4}}
\rput(psChartI4){\textcolor{red}{3}}
\rput(psChartI5){\textcolor{red}{3}}
\psset{nodesepA=5pt,nodesepB=-10pt}
\rput(psChartO1){{US}}
\rput(psChartO2){{EU}}
\rput(psChartO3){{China}}
\rput(psChartO4){{Japan}}
\rput(psChartO5){{Others}}
\end{pspicture}
\end{document}


 Fig.2 A practical example of pie chart plotting.

In this example, we put the labels using the nodes which have been defined by "\psChart".

Files Downloads: tex ps pdf

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