borders {ggplot2} | R Documentation |
Create a layer of map borders.
borders(database = "world", regions = ".", fill = NA, colour = "grey50", ...)
database |
map data, see |
regions |
map region |
fill |
fill colour |
colour |
border colour |
... |
other arguments passed onto
|
if (require("maps")) { ia <- map_data("county", "iowa") mid_range <- function(x) mean(range(x)) library(plyr) seats <- ddply(ia, .(subregion), colwise(mid_range, .(lat, long))) ggplot(ia, aes(long, lat)) + geom_polygon(aes(group = group), fill = NA, colour = "grey60") + geom_text(aes(label = subregion), data = seats, size = 2, angle = 45) data(us.cities) capitals <- subset(us.cities, capital == 2) ggplot(capitals, aes(long, lat)) + borders("state") + geom_point(aes(size = pop)) + scale_area() }