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

From: Nutter, Benjamin <NutterB_at_ccf.org>
Date: Mon, 28 Jul 2008 08:57:38 -0400

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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