BarText: Place Value Labels on a Barplot

Description Usage Arguments Details Value Author(s) See Also Examples

View source: R/DescTools.r

Description

Place text either in the middle of the stacked bars of a barplot or on top of a side by side barplot.

Usage

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BarText(height, b, labels = height, beside = FALSE, horiz = FALSE,
        cex = par("cex"), adj = NULL, 
        pos = c("topout", "topin", "mid", "bottomin", "bottomout"), 
        offset = 0, ...)

Arguments

height

either a vector or matrix of values describing the bars which make up the plot exactly as used for creating the barplot.

b

the returned mid points as returned by b <- barplot(...).

labels

the labels to be placed on the bars.

beside

a logical value. If FALSE, the columns of height are portrayed as stacked bars, and if TRUE the columns are portrayed as juxtaposed bars.

horiz

a logical value. If FALSE, the bars are drawn vertically with the first bar to the left. If TRUE, the bars are drawn horizontally with the first at the bottom.

cex

numeric character expansion factor; multiplied by par("cex") yields the final character size. NULL and NA are equivalent to 1.0.

adj

one or two values in [0, 1] which specify the x (and optionally y) adjustment of the labels. On most devices values outside that interval will also work.

pos

one of "topout", "topin", "mid", "bottomin", "bottomout", defining if the labels should be placed on top of the bars (inside or outside) or at the bottom of the bars (inside or outside). Will be ignored if beside is FALSE.

offset

a vector indicating how much the bars should be shifted relative to the x axis.

...

the dots are passed to the text.

Details

It sometimes makes sense to place the data values directly on the bars. The x coordinates of the labels can be found by using barplot() result, if they are to be centered at the top of each bar. BarText() calculates the rest. Notice that when the labels are placed on top of the bars, they may be clipped. This can be avoided by setting xpd=TRUE.

Value

returns the geometry of the labels invisibly

Author(s)

Andri Signorell <andri@signorell.net>

See Also

help

Examples

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# simple vector
x <- c(453, 44, 56, 34)
b <- barplot(x)
BarText(x, b, x)

# more complicated
b <- barplot(VADeaths, horiz = FALSE, col=hblue, beside = TRUE)
BarText(VADeaths, b=b, horiz = FALSE, beside = TRUE, cex=0.8)
BarText(VADeaths, b=b, horiz = FALSE, beside = TRUE, cex=0.8, pos="bottomin",
        col="white", font=2)

b <- barplot(VADeaths, horiz = TRUE, col=hblue, beside = TRUE)
BarText(VADeaths, b=b, horiz = TRUE, beside = TRUE, cex=0.8)

b <- barplot(VADeaths)
BarText(VADeaths, b=b)

b <- barplot(VADeaths, horiz = TRUE)
BarText(VADeaths, b=b, horiz = TRUE, col="red", cex=1.5)


# position of the text
par(mfrow=c(3,2))
off <- c(10, 4, 1, 20, -15)

for(pos in eval(formals(BarText)$pos)) {
  b <- barplot(x, offset=off, 
  main=gettextf("Textposition pos = '%s'", pos), horiz=TRUE)
  abline(h=0)
  BarText(x, b, x, offset = off, pos=pos, cex=1.5, horiz=TRUE)
}

AndriSignorell/DescTools documentation built on April 8, 2021, 5:51 a.m.