Re: [R] placing rectangle behind plot

From: Sebastian P. Luque <>
Date: Sun 30 Jul 2006 - 13:06:22 EST

Hi Gabor,

On Sat, 29 Jul 2006 17:20:29 -0400,
"Gabor Grothendieck" <> wrote:

> 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?

If you only need to draw the rectangle behind the points, why not 'panel.polygon' before 'panel.xyplot'?

xyplot(x ~ x | gl(2, 1), layout=1:2,

       panel=function(x, y, ...) {
           panel.polygon(c(3, 3, 8, 8), c(0, 12, 12, 0), col=2)
           panel.xyplot(x, y, ...)



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Received on Sun Jul 30 13:08:04 2006

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