On Jul 18, 2011, at 1:14 PM, Dutrieux, Loïc wrote:
Hello,
In order to reduce the width of my legend in a plot I introduced
line jumps in the title. Here's the problem; the legend box hasn't
adapted accordingly and part of the title is printed out of the frame.
See the example below:
plot(1:10)
legend("bottomright", bg="white", fill=c(7,8,12,13,19),
legend=c("7","8","12","13","19"), title="CAVM\nvegetation
\ncategories")
Does anyone know a trick to cope with that problem?
It looks like this has been raised in the past, and reading the help
page makes me think no one has supplied a fix:
http://finzi.psych.upenn.edu/R/Rhelp02/archive/87940.html
(and looking at the code I think this is the area to start your
hacking to make the box bigger:
else {
h <- (n.legpercol + (!is.null(title))) * ychar + yc
# substitute 3 for the !is.null() call
w0 <- text.width + (x.intersp + 1) * xchar
if (mfill)
w0 <- w0 + dx.fill
if (do.lines)
w0 <- w0 + (seg.len + x.off) * xchar
w <- ncol * w0 + 0.5 * xchar
if (!is.null(title) && (abs(tw <- strwidth(title, units = "user",
cex = cex) + 0.5 * xchar)) > abs(w)) {
xextra <- (tw - w)/2
w <- tw
}
And also adjust the positioning of the title text in this code
if (!is.null(title))
+ text2(left + w * title.adj, top - ymax, labels = title,
+ adj = c(title.adj, 0), cex = cex, col = title.col)
... but I have not figured out which internal variable to adjust to
push down the colored rectangles and legend labels.
Have you considered lattice or ggplot strategies.
Thank you in advance,
Regards,
loïc
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