pixel art of ggplot2 faceting using geofacet

June 26, 2017
By

(This article was first published on R on Guangchuang YU, and kindly contributed to R-bloggers)

I just discovered an interesting ggplot2 extension, geofacet, that supports arranging facet panels that mimics geographic topoloty.

After playing with it, I realized that it is not only for visualizing geo-related data, but also can be fun for presenting data to mimics pixel art.

Here is an example using the Turkey shape:

Turkey <- read.csv("http://pages.iu.edu/~cdesante/turkey.csv")
Turkey = Turkey[, -3]
colnames(Turkey)[2:1] = c("row", "col")
Turkey$row = max(Turkey$row) - Turkey$row +1
Turkey$name <- Turkey$code <- paste0('turkey', 1:nrow(Turkey))

require(ggplot2)
require(geofacet)
x <- split(eu_gdp, eu_gdp$code)
x <- x[sample.int(length(x), nrow(Turkey), replace=T)]
for (i in 1:length(x)) {
  x[[i]]$code = Turkey$code[i]
}
y <-  do.call(rbind, x)

p1 <- ggplot(y, aes(gdp_pc, year))+ geom_line(color="steelblue") +
  facet_geo(~code, grid=Turkey, scales='free')
print(p1)

p1 + theme_void() + theme(strip.text.x = element_blank())

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