On Sunday 18 July 2004 12:29, Andrew Criswell wrote:
> It also seems to work with two lines of code crossed out.
>
> library(lattice)
> z <- expand.grid(A = LETTERS[1:8], B = letters[1:6], x = 1, y = 1)
>
> trellis.device(png, file = "test%02d.png")
> # par(bg = "white")
> # lset(col.whitebg())
> lset(list(background = list(col = "white")))
> xyplot(y ~ x | A * B, data = z, layout = c(4, 6))
> dev.off()
Yes, that's because after trellis.device() is called, par("bg") is
already white, which makes the first commented line redundant. However,
it won't 'work' if you want to replace white by another color.
Moreover, I would consider this bad usage. The default color scheme for
png is designed for a gray background. What you have done (by
commenting the second line) is to change the background to white while
keeping everything else unchanged. This technically gives you the
desired objective of a white background, but with very light colors for
the points.
Deepayan
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