Hello,
Below is a function (test.map) that permits drawing the same map using
three different devices. The "pdf" device doesn't clip polygons to
the plot region as I see it does by both the native device (in my case
"Quartz") and the "png" device.
test.map("pdf") # produces "test-map.pdf" with no clipping
test.map("png") # produces "test-map.png" with clipping
test.map(NA) # draws on the window device with clipping
It doesn't appear to matter what the value of the fill argument is -
the pdf output shows that the polygons are not being clipped to the
plot region.
I have viewed the pdf output using Mac OSX's Preview, PDFPen, Adobe
Reader and Safari and they all render the same way. So my hunch is
that it is not a viewer issue (although I suppose they might be using
the same rendering engine under the hood.)
Any help would be greatly appreciated.
Thanks and cheers,
Ben
###### BEGIN
library(maps)
test.map <- function(to.file = c("pdf", "png", NA)[1], fill = TRUE){
if (!is.na(to.file)){
ofile = paste("test-map", to.file,sep = ".")
do.call(to.file, list(file=ofile))
}
xr <- c(-185, -155)
yr <- c(45, 70)
map(xlim = xr, ylim = yr)
map.axes()
m <- matrix(seq(0, 1, length = 40*40), nrow = 40)
mr <- as.raster(m)
rasterImage(m, -180, 50, -160, 65)
map(xlim = xr, ylim = yr, fill = fill, add = TRUE)
if (!is.na(to.file)){
cat("wrote:", ofile, "\n")
dev.state <- dev.off()
}
}
###### END
> sessionInfo()
R version 2.12.0 (2010-10-15)
Platform: i386-apple-darwin9.8.0/i386 (32-bit)
locale:
[1] en_US.UTF-8/en_US.UTF-8/C/C/en_US.UTF-8/en_US.UTF-8
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] mapproj_1.1-8.2 akima_0.5-4 RColorBrewer_1.0-2
[4] mapdata_2.1-3 maps_2.1-5
loaded via a namespace (and not attached):
[1] tools_2.12.0
Ben Tupper
Bigelow Laboratory for Ocean Sciences
180 McKown Point Rd. P.O. Box 475
West Boothbay Harbor, Maine 04575-0475
http://www.bigelow.org/
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