mages

#' Doughnut plot
#'
#' Draw a doughnut plot
#' 
#' This function draws a pie chart with a hole; a doughnut plot
#' The doughnut plot is based on the pie plot, see \code{\link{pie}}.
#' 
#' @param x a vector of non-negative numerical quantities.
#'          The values in \code{x} are displayed as the areas of 
#'          doughnut slices.