Here is an example using grid functions, based on an example from Deepayan
(https://stat.ethz.ch/pipermail/r-help/2005-April/069459.html)
I hope this helps.
library(grid)
library(lattice)
ft <-
grid.layout(nrow = 2, ncol = 4,
heights = unit(rep(1, 2), "lines"),
widths unit(c(2, 1, 2, 1),
c("cm", "strwidth", "cm",
"strwidth", "cm",
"strwidth"),
data = list(NULL, "John", NULL,
"George")))
foo <- frameGrob(layout = ft)
foo <- placeGrob(foo,
pointsGrob(.5, .5, pch=19,
gp = gpar(col="red", cex=0.5)),
row = 1, col = 1)
foo <- placeGrob(foo,
linesGrob(c(0.2, 0.8), c(.5, .5),
gp = gpar(col="blue")),
row = 2, col = 1)
foo <- placeGrob(foo,
linesGrob(c(0.2, 0.8), c(.5, .5),
gp = gpar(col="green")),
row = 1, col = 3)
foo <- placeGrob(foo,
linesGrob(c(0.2, 0.8), c(.5, .5),
gp = gpar(col="brown")),
row = 2, col = 3)
foo <- placeGrob(foo,
textGrob(lab = "John"),
row = 1, col = 2)
foo <- placeGrob(foo,
textGrob(lab = "Paul"),
row = 2, col = 2)
foo <- placeGrob(foo,
textGrob(lab = "George"),
row = 1, col = 4)
foo <- placeGrob(foo,
textGrob(lab = "Ringo"),
row = 2, col = 4)
fb <-
grid.layout(nrow = 1, ncol = 2,
heights = unit(1, "lines"),
widths unit(c(2, 1),
c("cm", "strwidth"),
data = list(NULL, "The Beatles")))
boo <- frameGrob(layout = fb)
boo <- placeGrob(boo,
rectGrob(width = 0.6,
gp = gpar(col="orange",
fill = "orange")),
row = 1, col = 1)
boo <- placeGrob(boo,
textGrob(lab = "The Beatles"),
row = 1, col = 2)
xyplot(1 ~ 1, legend = list(top = list(fun = foo),
bottom = list(fun = boo)))
-----Original Message-----
From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org]
On Behalf Of Jun Shen
Sent: 16 September 2013 17:27
To: R-help
Subject: [R] Draw two separate legends in xyplot
Hi all,
I wonder if there is a way to draw two separate legends in xyplot as I would
like to separate the legend for data and the legend for reference lines I add. I
can use key argument to draw one legend with everything together. What I really
want is to put one legend at the bottom and the other on the top. Thanks.
Jun
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