Color map of Poland for the New Year

December 31, 2011
By

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

To celebrate the New Year I decided to plot map of Poland in our national colors.

It was not so difficult using maps  package. Here is the result:


and the code I used to generate it:

library(maps)

x.mid <- function(x1, x2, y1, y2, y.mid) {
      x1 + ((x2 - x1) / (y2 - y1)) * (y.mid - y1)
}

poland <- map("world","poland", fill=T, col="#D4213D")

mid <- mean(poland$range[3:4])
upper <- poland$y > mid
cut1 <- which.max(diff(upper))
x.first <- x.mid(poland$x[cut1], poland$x[cut1 + 1],
                 poland$y[cut1], poland$y[cut1 + 1], mid)
cut2 <- which.min(diff(upper))
x.last <- x.mid(poland$x[cut2], poland$x[cut2 + 1],
                 poland$y[cut2], poland$y[cut2 + 1], mid)
                         
upperx <- c(x.first,poland$x[upper],x.last)
uppery <- c(mid, poland$y[upper], mid)
polygon(upperx, uppery, col="white")

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