# NOT RUN {
if (require("maps") && require("ggplot2")) {
library(maps)
library(ggplot2)
ca <- map("county", "ca", plot = FALSE, fill = TRUE)
tidy(ca)
qplot(long, lat, data = ca, geom = "polygon", group = group)
tx <- map("county", "texas", plot = FALSE, fill = TRUE)
tidy(tx)
qplot(long, lat, data = tx, geom = "polygon", group = group,
colour = I("white"))
}
# }
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