borders: Create a layer of map borders.

In hadley/spatialVis: Spatial components for ggplot2

Description

Create a layer of map borders.

Usage

borders(database="world", regions=".", fill=NA,
    colour="grey50", ...)

Arguments

database	map data, see map for details
regions	map region
fill	fill colour
colour	border colour
...	other arguments passed onto geom_polygon

Examples

require("maps")
require("ggplot2")

ia <- map_data("county", "iowa")
mid_range <- function(x) mean(range(x))
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()

hadley/spatialVis documentation built on May 17, 2019, 12:47 p.m.