[R] Borders for rectangles in lattice plot key

[Richard.Cotton at hsl.gov.uk]

Hopefully an easy question.  When drawing a rectangles in a lattice plot 
key, how do you omit the black borders?

Here is an example adapted from one on the xyplot help page:

bar.cols <- c("red", "blue")
key.list <- list(
   space="top",
   rectangles=list(col=bar.cols),
   text=list(c("foo", "bar"))
)

barchart(
   yield ~ variety | site, 
   data = barley,
   groups = year, 
   layout = c(1,6),
   ylab = "Barley Yield (bushels/acre)",
   scales = list(x = list(abbreviate = TRUE, minlength = 5)),
   col=bar.cols,
   border="transparent",
   key=key.list
)

Notice the black borders around the rectangles in the key. 

I checked to see if there was an undocumented border component for the 
rectangles compoenent of key that I could set to "transparent" or FALSE, 
but no luck.  I also tried setting lwd=0 on the rectangle component but 
that didn't change anything either.

Regards,
Richie.

Mathematical Sciences Unit
HSL


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