[R] placing rectangle behind plot

From: Gabor Grothendieck <ggrothendieck_at_gmail.com>
Date: Sun 30 Jul 2006 - 07:20:29 EST

I am trying to create a lattice plot and would like to later, i.e. after the plot is drawn, add a grey rectangle behind a portion of it. The following works except that the rectrangle is on top of and obscures a portion of the chart. I also tried adding col = "transparent" to the gpar list but that did not help -- I am on windows and perhaps the windows device does not support transparency? At any rate, how can I place the rectangle behind the plotted points without drawing the rectangle first?

x <- 1:10
xyplot(x ~ x | gl(2,1), layout = 1:2)
trellis.focus("panel", 1, 1)
grid.rect(w = .5, gp = gpar(fill = "light grey")) trellis.unfocus()

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