\name{election}
\alias{election}
\title{Assign party members to seats}
\description{Create a layout for an election result in an assembly}
\usage{
 election(seats,result,formula,colours = sample(rainbow(length(counts))))
}
\arguments{
 \item{seats}{A data frame of x and y positions, row numbers and angles
  (usually the output from the seats function).}
 \item{result}{A data frame with party names and seat counts.}
 \item{formula}{A formula with the party name column on the left and the
  count column on the right. Think of the twiddle symbol as "got".}
 \item{colours}{A vector of colours. If missing a random rainbow is used.
  This may cause Green parties to show as red.}
}
\value{
 A data frame including:
 \item{x}{The x positions of the seats to be plotted on semi-circular
  arcs.}
 \item{y}{The y positions of the seats to be plotted on semi-circular
  arcs.}
 \item{r}{The row numbers for each seat.}
 \item{theta}{The angle of each seat, going from pi to zero radians.}
 \item{party}{The labels for the party holding each seat.}
 \item{colour}{The colour that has been assigned to the party.}
}
\author{Barry Rowlingson}
\seealso{\link{seats}}
\examples{
 # The EU parliament has 751 seats, and Wikipedia currently shows this
 eu = structure(list(colour = c("#3399FF", "#F0001C", "#0054A5", "#FFD700",
 "#990000", "#909090", "#32CD32", "#40E0D0"), party = c("EPP",
 "S and D", "ECR", "ALDE", "GUE-NGL", "Non-Inscrits", "Greens-EFA",
 "EFDD"), members = c(220L, 191L, 70L, 68L, 52L, 52L, 50L, 48L
 )), .Names = c("colour", "party", "members"), row.names = c(NA,
 -8L), class = "data.frame")
 strasbourg = seats(751, 16)
 eugov = election(strasbourg, eu, party~members, colours=eu$colour)
 oldmar<-par(mar=c(2,4,4,2))
 plot(eugov$x, eugov$y, col=eugov$colour, asp=1, pch=19, ylim=c(-2,2.5),
  xlab="", ylab="", main="EU Parliament 2014", axes=FALSE)
 legend(-0.7,-0.3,eu$party,fill=eu$colour)
 par(oldmar)
 # or using ggplot2
 \dontrun{ 
  require(ggplot2)
  blank = theme(axis.line=element_blank(),
        axis.text.x=element_blank(),
  axis.text.y=element_blank(),
  axis.ticks=element_blank(),
  axis.title.x=element_blank(),
  axis.title.y=element_blank(),
  panel.background=element_blank(),
  panel.border=element_blank(),
  panel.grid.major=element_blank(),
  panel.grid.minor=element_blank(),
  plot.background=element_blank())
  ggplot(eugov, aes(x=x,y=y,col=party)) + geom_point() + coord_fixed() + blank
 }
}
\keyword{misc}