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\name{Pie charts as vertices}
\alias{vertex.shape.pie}
\concept{Vertex shapes}
\title{Using pie charts as vertices in graph plots}
\description{
More complex vertex images can be used to express addtional
information about vertices. E.g. pie charts can be used as vertices,
to denote vertex classes, fuzzy classification of vertices, etc.
}
\details{
The vertex shape \sQuote{pie} makes igraph draw a pie chart for every
vertex. There are some extra graphical vertex parameters that specify
how the pie charts will look like:
\describe{
\item{pie}{Numeric vector, gives the sizes of the pie slices.}
\item{pie.color}{A list of color vectors to use for the pies. If it
is a list of a single vector, then this is used for all pies. It
the color vector is shorter than the number of areas in a pie,
then it is recycled.}
\item{pie.border}{The color of the border line of the pie charts, in
the same format as \code{pie.color}.}
\item{pie.angle}{The slope of shading lines, given as an angle in
degrees (counter-clockwise).}
\item{pie.density}{The density of the shading lines, in lines per
inch. Non-positive values inhibit the drawing of shading lines.}
\item{pie.lty}{The line type of the border of the slices.}
}
}
\author{ Gabor Csardi \email{csardi.gabor@gmail.com} }
\seealso{ \code{\link{igraph.plotting}}, \code{\link{plot.igraph}} }
\examples{
g <- make_ring(10)
values <- lapply(1:10, function(x) sample(1:10,3))
if (interactive()) {
plot(g, vertex.shape="pie", vertex.pie=values,
vertex.pie.color=list(heat.colors(5)),
vertex.size=seq(10,30,length=10), vertex.label=NA)
}
}
\keyword{graphs}
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