rlegend is a version of legend for Rthat implements
plot=FALSE, adds grid=TRUE, and defaults lty, lwd,
pch to NULL and checks for length>0 rather than
missing(), so it's easier to deal with non-applicable
parameters. But when grid is in effect, the preferred function
to use is rlegendg, which calls the lattice
draw.key function.rlegend(x, y, legend, fill, col = "black", lty = NULL, lwd = NULL, pch = NULL, angle = NULL, density = NULL, bty = "o", bg = par("bg"), pt.bg = NA, cex = 1, xjust = 0, yjust = 1, x.intersp = 1, y.intersp = 1, adj = 0, text.width = NULL, merge = do.lines && has.pch, trace = FALSE, ncol = 1, horiz = FALSE, plot = TRUE, grid = FALSE, ...)rlegendg(x, y, legend, col=pr$col[1], lty=NULL,
lwd=NULL, pch=NULL, cex=pr$cex[1], other=NULL)
legendFALSE to suppress drawing the legend. This
is used the compute the size needed for when the legend is drawn
with a later call to rlegend.TRUE if the grid package is in effectlegenddraw.key. See the help file for xyplot.rect and text. rect has
elements w, h, left, top with size/position information.legend,draw.key