[R] cloud plot has white(transparent?) background

[Deepayan Sarkar]

On 4/22/08, David Winsemius <dwinsemius at comcast.net> wrote:
> Karin Lagesen <karin.lagesen at medisin.uio.no> wrote in
>  news:ypx6prsixgly.fsf at alanine.uio.no:
>
>
>  > I am using the code example from the R graph gallery to look at a
>  > cloud plot:
>  >
>  > require(lattice)
>  > data(iris)
>  > print(cloud(Sepal.Length ~ Petal.Length * Petal.Width, data = iris,
>  >             groups = Species, screen = list(z = 20, x = -70),
>  >             perspective = FALSE,
>  >             key = list(title = "Iris Data", x = .15, y=.85, corner =
>  >             c(0,1), border = TRUE,
>  >             points = Rows(trellis.par.get("superpose.symbol"), 1:3),
>  >             text = list(levels(iris$Species)))))
>  >
>  > Now, in the example on the webpage this comes out with a nice gray
>  > background that makes things easier to see. Mine comes out with a
>  > white, potentially transparent background and also the point colors
>  > have changed.
>  >
>  > How do I get the nice gray color back?
>
>
> I think the grey obscures the plot, but with some searching of the help
>  files, displaying the rather extensive list from
>  trellis.par.get(name = NULL)  ... and then finding "Graphical
>  Parameters for Trellis Displays", this seems to do what's desired, ...
>
>   background <- trellis.par.get("background")
>   background$col <- "grey"
>   trellis.par.set("background", background)

That is NOT the recommended approach, as it does not change the other
colors, which are designed to go well with a white or light
background, not a grey background. Using standard.theme() gives you a
more coherent collection of parameters.

-Deepayan