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# chelsyx/donutchart.R

Forked from mages/doughnut.R
Last active Jan 21, 2016
Donut Charts in R
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 #From http://stackoverflow.com/questions/13615562/ggplot-donut-chart library(ggplot2) # Create test data. dat = data.frame(count=c(10, 60, 30), category=c("A", "B", "C")) # Add addition columns, needed for drawing with geom_rect. dat$fraction = dat$count / sum(dat$count) dat = dat[order(dat$fraction), ] dat$ymax = cumsum(dat$fraction) dat$ymin = c(0, head(dat$ymax, n=-1)) p1 = ggplot(dat, aes(fill=category, ymax=ymax, ymin=ymin, xmax=4, xmin=3)) + geom_rect() + coord_polar(theta="y") + xlim(c(0, 4)) + labs(title="Basic ring plot") p2 = ggplot(dat, aes(fill=category, ymax=ymax, ymin=ymin, xmax=4, xmin=3)) + geom_rect(colour="grey30") + coord_polar(theta="y") + xlim(c(0, 4)) + theme_bw() + theme(panel.grid=element_blank()) + theme(axis.text=element_blank()) + theme(axis.ticks=element_blank()) + labs(title="Customized ring plot") library(gridExtra) png("ring_plots_1.png", height=4, width=8, units="in", res=120) grid.arrange(p1, p2, nrow=1) dev.off()
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 #' 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. #' @param labels one or more expressions or character strings giving #' names for the slices. Other objects are coerced by #' \code{\link{as.graphicsAnnot}}. For empty or \code{NA} #' (after coercion to character) labels, no label nor #' pointing line is drawn. #' @param edges the circular outline of the doughnut is approximated #' by a polygon with this many edges. #' @param outer.radius the doughnut is drawn centered in a square box #' whose sides range from \eqn{-1} to \eqn{1}. If the #' character strings labeling the slices are long it may be #' necessary to use a smaller radius. #' @param inner.radius Size of the inner radius to be whited #' @param clockwise logical indicating if slices are drawn clockwise #' or counter clockwise (i.e., mathematically positive #' direction), the latter is default. #' @param init.angle number specifying the \emph{starting angle} (in #' degrees) for the slices. Defaults to 0 (i.e., #' \sQuote{3 o'clock}) unless \code{clockwise} is true where #' \code{init.angle} defaults to 90 (degrees), (i.e., #' \sQuote{12 o'clock}). #' @param density the density of shading lines, in lines per inch. #' The default value of \code{NULL} means that no shading #' lines are drawn. Non-positive values of \code{density} #' also inhibit the drawing of shading lines. #' @param angle the slope of shading lines, given as an angle in #' degrees (counter-clockwise). #' @param col a vector of colors to be used in filling or shading #' the slices. If missing a set of 6 pastel colours is #' used, unless \code{density} is specified when #' \code{par("fg")} is used. #' @param border, lty (possibly vectors) arguments passed to #' \code{\link{polygon}} which draws each slice. #' @param main an overall title for the plot. #' @param \dots graphical parameters can be given as arguments to #' \code{pie}. They will affect the main title and #' labels only. #' #' @author Original pie plot by R Core, amended by Markus Gesmann #' for a doughnut plot #' @keywords hplot #' @seealso \code{\link{pie}} #' @export #' @examples #' x <- c(2,4,3,2,4) #' doughnut(x) #' ## Add lables #' doughnut(x, labels=LETTERS[1:5]) doughnut <- function (x, labels = names(x), edges = 200, outer.radius = 0.8, inner.radius=0.6, clockwise = FALSE, init.angle = if (clockwise) 90 else 0, density = NULL, angle = 45, col = NULL, border = FALSE, lty = NULL, main = NULL, ...) { if (!is.numeric(x) || any(is.na(x) | x < 0)) stop("'x' values must be positive.") if (is.null(labels)) labels <- as.character(seq_along(x)) else labels <- as.graphicsAnnot(labels) x <- c(0, cumsum(x)/sum(x)) dx <- diff(x) nx <- length(dx) plot.new() pin <- par("pin") xlim <- ylim <- c(-1, 1) if (pin[1L] > pin[2L]) xlim <- (pin[1L]/pin[2L]) * xlim else ylim <- (pin[2L]/pin[1L]) * ylim plot.window(xlim, ylim, "", asp = 1) if (is.null(col)) col <- if (is.null(density)) palette() else par("fg") col <- rep(col, length.out = nx) border <- rep(border, length.out = nx) lty <- rep(lty, length.out = nx) angle <- rep(angle, length.out = nx) density <- rep(density, length.out = nx) twopi <- if (clockwise) -2 * pi else 2 * pi t2xy <- function(t, radius) { t2p <- twopi * t + init.angle * pi/180 list(x = radius * cos(t2p), y = radius * sin(t2p)) } for (i in 1L:nx) { n <- max(2, floor(edges * dx[i])) P <- t2xy(seq.int(x[i], x[i + 1], length.out = n), outer.radius) polygon(c(P$x, 0), c(P$y, 0), density = density[i], angle = angle[i], border = border[i], col = col[i], lty = lty[i]) Pout <- t2xy(mean(x[i + 0:1]), outer.radius) lab <- as.character(labels[i]) if (!is.na(lab) && nzchar(lab)) { lines(c(1, 1.05) * Pout$x, c(1, 1.05) * Pout$y) text(1.1 * Pout$x, 1.1 * Pout$y, labels[i], xpd = TRUE, adj = ifelse(Pout$x < 0, 1, 0), ...) } ## Add white disc Pin <- t2xy(seq.int(0, 1, length.out = n*nx), inner.radius) polygon(Pin$x, Pin\$y, density = density[i], angle = angle[i], border = border[i], col = "white", lty = lty[i]) } title(main = main, ...) invisible(NULL) }