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add a margin text

add_mtext.Rd

Similar to mtext allowing adding a text to the margins of a map. This function uses the margins around the mapped area; not the margins that R would use.

Usage

add_mtext(text, side=3, line=0, adj=0.5, ...)

Arguments

text

character or expression vector specifying the text to be written

side

integer indicating the margin to use (1=bottom, 2=left, 3=top, 4=right)

line

numeric to move the text in or outwards

adj

numeric between 0 and 1 to align the text along the margin. Use 0 for left (sides 1 and 3) or bottom (sides 2 and 4), 1 for right or top, and 0.5, the default, to center it

...

arguments passed to text

See also

add_legend, add_grid, add_box

Examples

f <- system.file("ex/elev.tif", package="terra")
r <- rast(f)

plot(r, axes=FALSE, legend=FALSE)
add_box()
for (i in 1:4) add_mtext("margin text", i, cex=i, col=i, line=2-i)


# align the text along the margin
plot(r, axes=FALSE, legend=FALSE)
add_box()
for (i in 1:4) {
  add_mtext("start", i, adj=0, col="blue")
  add_mtext("middle", i, adj=0.5, cex=1.5)
  add_mtext("end", i, adj=1, col="red")
}