Re: [R] Color of box frame in Legend (Was: Matrix barplot)

From: Prof Brian Ripley <ripley_at_stats.ox.ac.uk>
Date: Mon, 28 Jul 2008 17:24:54 +0100 (BST)

The current default for the box/frame colour is not "black" (it is par("fg")), but otherwise I've committed something very similar to the R-devel version of R earlier today.

On Mon, 28 Jul 2008, Nutter, Benjamin wrote:

> Try sourcing in the 'new.legend' function below. It's the legend
> function with a new argument called 'box.col'. The argument will change
> the color of the box surrounding the legend. If I understand what it is
> you are looking for, this should work. Also, I didn't see a way to
> change the axis bar in your code, so I suppressed the axis in the call
> to barplot, and manually replaced the axis using the axis function. I
> hope this works for you.
>
> Benjamin
>
> data <- data.frame(Year=c(2000,2001,2002),
> A=c(2,2,1),
> B=c(3,1,2),
> C=c(0,3,5))
>
> data.mat <- as.matrix(data)[,2:4]
> rownames(data.mat) <- data[['Year']]
> data.mat <- t(data.mat)
>
> textcolor="yellow"
> par(col.axis=textcolor,col.main=textcolor)
>
> barplot(data.mat,beside=TRUE,col=rainbow(3),main="Test",yaxt="n")
> axis(2,at=0:5,col=textcolor)
> new.legend(x="topleft", colnames(data[,2:4]),fill=rainbow(3),
> inset=0.05,
> text.col=textcolor,box.col=textcolor
> )
>
>
> ########################################################################
> ###
> ########################################################################
> ###
> new.legend <- function (x, y = NULL, legend, fill = NULL, col =
> par("col"),
> lty, lwd, pch, angle = 45, density = NULL, bty = "o", bg =
> par("bg"),
> box.lwd = par("lwd"), box.lty = par("lty"), box.col="black",
> pt.bg = NA, cex = 1,
> pt.cex = cex, pt.lwd = lwd, xjust = 0, yjust = 1, x.intersp = 1,
> y.intersp = 1, adj = c(0, 0.5), text.width = NULL, text.col =
> par("col"),
> merge = do.lines && has.pch, trace = FALSE, plot = TRUE,
> ncol = 1, horiz = FALSE, title = NULL, inset = 0)
> {
> if (missing(legend) && !missing(y) && (is.character(y) ||
> is.expression(y))) {
> legend <- y
> y <- NULL
> }
> mfill <- !missing(fill) || !missing(density)
> title <- as.graphicsAnnot(title)
> if (length(title) > 1)
> stop("invalid title")
> legend <- as.graphicsAnnot(legend)
> n.leg <- if (is.call(legend))
> 1
> else length(legend)
> if (n.leg == 0)
> stop("'legend' is of length 0")
> auto <- if (is.character(x))
> match.arg(x, c("bottomright", "bottom", "bottomleft",
> "left", "topleft", "top", "topright", "right", "center"))
> else NA
> if (is.na(auto)) {
> xy <- xy.coords(x, y)
> x <- xy$x
> y <- xy$y
> nx <- length(x)
> if (nx < 1 || nx > 2)
> stop("invalid coordinate lengths")
> }
> else nx <- 0
> xlog <- par("xlog")
> ylog <- par("ylog")
> rect2 <- function(left, top, dx, dy, density = NULL, angle,
> ...) {
> r <- left + dx
> if (xlog) {
> left <- 10^left
> r <- 10^r
> }
> b <- top - dy
> if (ylog) {
> top <- 10^top
> b <- 10^b
> }
> rect(left, top, r, b, angle = angle, density = density,
> ...)
> }
> segments2 <- function(x1, y1, dx, dy, ...) {
> x2 <- x1 + dx
> if (xlog) {
> x1 <- 10^x1
> x2 <- 10^x2
> }
> y2 <- y1 + dy
> if (ylog) {
> y1 <- 10^y1
> y2 <- 10^y2
> }
> segments(x1, y1, x2, y2, ...)
> }
> points2 <- function(x, y, ...) {
> if (xlog)
> x <- 10^x
> if (ylog)
> y <- 10^y
> points(x, y, ...)
> }
> text2 <- function(x, y, ...) {
> if (xlog)
> x <- 10^x
> if (ylog)
> y <- 10^y
> text(x, y, ...)
> }
> if (trace)
> catn <- function(...) do.call("cat", c(lapply(list(...),
> formatC), list("\n")))
> cin <- par("cin")
> Cex <- cex * par("cex")
> if (is.null(text.width))
> text.width <- max(abs(strwidth(legend, units = "user",
> cex = cex)))
> else if (!is.numeric(text.width) || text.width < 0)
> stop("'text.width' must be numeric, >= 0")
> xc <- Cex * xinch(cin[1], warn.log = FALSE)
> yc <- Cex * yinch(cin[2], warn.log = FALSE)
> if (xc < 0)
> text.width <- -text.width
> xchar <- xc
> xextra <- 0
> yextra <- yc * (y.intersp - 1)
> ymax <- yc * max(1, strheight(legend, units = "user", cex = cex)/yc)
> ychar <- yextra + ymax
> if (trace)
> catn(" xchar=", xchar, "; (yextra,ychar)=", c(yextra,
> ychar))
> if (mfill) {
> xbox <- xc * 0.8
> ybox <- yc * 0.5
> dx.fill <- xbox
> }
> do.lines <- (!missing(lty) && (is.character(lty) || any(lty >
> 0))) || !missing(lwd)
> n.legpercol <- if (horiz) {
> if (ncol != 1)
> warning("horizontal specification overrides: Number of
> columns := ",
> n.leg)
> ncol <- n.leg
> 1
> }
> else ceiling(n.leg/ncol)
> if (has.pch <- !missing(pch) && length(pch) > 0) {
> if (is.character(pch) && !is.na(pch[1]) && nchar(pch[1],
> type = "c") > 1) {
> if (length(pch) > 1)
> warning("not using pch[2..] since pch[1] has multiple
> chars")
> np <- nchar(pch[1], type = "c")
> pch <- substr(rep.int(pch[1], np), 1:np, 1:np)
> }
> if (!merge)
> dx.pch <- x.intersp/2 * xchar
> }
> x.off <- if (merge)
> -0.7
> else 0
> if (is.na(auto)) {
> if (xlog)
> x <- log10(x)
> if (ylog)
> y <- log10(y)
> }
> if (nx == 2) {
> x <- sort(x)
> y <- sort(y)
> left <- x[1]
> top <- y[2]
> w <- diff(x)
> h <- diff(y)
> w0 <- w/ncol
> x <- mean(x)
> y <- mean(y)
> if (missing(xjust))
> xjust <- 0.5
> if (missing(yjust))
> yjust <- 0.5
> }
> else {
> h <- (n.legpercol + (!is.null(title))) * ychar + yc
> w0 <- text.width + (x.intersp + 1) * xchar
> if (mfill)
> w0 <- w0 + dx.fill
> if (has.pch && !merge)
> w0 <- w0 + dx.pch
> if (do.lines)
> w0 <- w0 + (2 + x.off) * xchar
> w <- ncol * w0 + 0.5 * xchar
> if (!is.null(title) && (tw <- strwidth(title, units = "user",
> cex = cex) + 0.5 * xchar) > w) {
> xextra <- (tw - w)/2
> w <- tw
> }
> if (is.na(auto)) {
> left <- x - xjust * w
> top <- y + (1 - yjust) * h
> }
> else {
> usr <- par("usr")
> inset <- rep(inset, length.out = 2)
> insetx <- inset[1] * (usr[2] - usr[1])
> left <- switch(auto, bottomright = , topright = ,
> right = usr[2] - w - insetx, bottomleft = , left = ,
> topleft = usr[1] + insetx, bottom = , top = ,
> center = (usr[1] + usr[2] - w)/2)
> insety <- inset[2] * (usr[4] - usr[3])
> top <- switch(auto, bottomright = , bottom = , bottomleft =
> usr[3] +
> h + insety, topleft = , top = , topright = usr[4] -
> insety, left = , right = , center = (usr[3] +
> usr[4] + h)/2)
> }
> }
> if (plot && bty != "n") {
> if (trace)
> catn(" rect2(", left, ",", top, ", w=", w, ", h=",
> h, ", ...)", sep = "")
> rect2(left, top, dx = w, dy = h, col = bg, density = NULL,
> lwd = box.lwd, lty = box.lty, border=box.col)
> }
> xt <- left + xchar + xextra + (w0 * rep.int(0:(ncol - 1),
> rep.int(n.legpercol, ncol)))[1:n.leg]
> yt <- top - 0.5 * yextra - ymax - (rep.int(1:n.legpercol,
> ncol)[1:n.leg] - 1 + (!is.null(title))) * ychar
> if (mfill) {
> if (plot) {
> fill <- rep(fill, length.out = n.leg)
> rect2(left = xt, top = yt + ybox/2, dx = xbox, dy = ybox,
> col = fill, density = density, angle = angle,
> border = "black")
> }
> xt <- xt + dx.fill
> }
> if (plot && (has.pch || do.lines))
> col <- rep(col, length.out = n.leg)
> if (missing(lwd))
> lwd <- par("lwd")
> if (do.lines) {
> seg.len <- 2
> if (missing(lty))
> lty <- 1
> lty <- rep(lty, length.out = n.leg)
> lwd <- rep(lwd, length.out = n.leg)
> ok.l <- !is.na(lty) & (is.character(lty) | lty > 0)
> if (trace)
> catn(" segments2(", xt[ok.l] + x.off * xchar, ",",
> yt[ok.l], ", dx=", seg.len * xchar, ", dy=0, ...)")
> if (plot)
> segments2(xt[ok.l] + x.off * xchar, yt[ok.l], dx = seg.len *
>
> xchar, dy = 0, lty = lty[ok.l], lwd = lwd[ok.l],
> col = col[ok.l])
> xt <- xt + (seg.len + x.off) * xchar
> }
> if (has.pch) {
> pch <- rep(pch, length.out = n.leg)
> pt.bg <- rep(pt.bg, length.out = n.leg)
> pt.cex <- rep(pt.cex, length.out = n.leg)
> pt.lwd <- rep(pt.lwd, length.out = n.leg)
> ok <- !is.na(pch) & (is.character(pch) | pch >= 0)
> x1 <- (if (merge)
> xt - (seg.len/2) * xchar
> else xt)[ok]
> y1 <- yt[ok]
> if (trace)
> catn(" points2(", x1, ",", y1, ", pch=", pch[ok],
> ", ...)")
> if (plot)
> points2(x1, y1, pch = pch[ok], col = col[ok], cex =
> pt.cex[ok],
> bg = pt.bg[ok], lwd = pt.lwd[ok])
> if (!merge)
> xt <- xt + dx.pch
> }
> xt <- xt + x.intersp * xchar
> if (plot) {
> if (!is.null(title))
> text2(left + w/2, top - ymax, labels = title, adj = c(0.5,
> 0), cex = cex, col = text.col)
> text2(xt, yt, labels = legend, adj = adj, cex = cex,
> col = text.col)
> }
> invisible(list(rect = list(w = w, h = h, left = left, top = top),
> text = list(x = xt, y = yt)))
> }
>
>
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-- 
Brian D. Ripley,                  ripley_at_stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595

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Received on Mon 28 Jul 2008 - 16:43:47 GMT

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