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To celebrate the New Year I decided to plot map of Poland in our national colors.Want to share your content on R-bloggers? click here if you have a blog, or here if you don't.
It was not so difficult using maps package. Here is the result:
and the code I used to generate it:
library(maps)< o:p>
x.mid <- function(x1, x2, y1, y2, y.mid) {< o:p>
x1 + ((x2 – x1) / (y2 – y1)) * (y.mid – y1)< o:p>
}< o:p>
poland <- map(“world”,“poland”, fill=T, col=“#D4213D”)< o:p>
mid <- mean(poland$range[3:4])< o:p>
upper <- poland$y > mid< o:p>
cut1 <- which.max(diff(upper))< o:p>
x.first <- x.mid(poland$x[cut1], poland$x[cut1 + 1],< o:p>
poland$y[cut1], poland$y[cut1 + 1], mid)< o:p>
cut2 <- which.min(diff(upper))< o:p>
x.last <- x.mid(poland$x[cut2], poland$x[cut2 + 1],< o:p>
poland$y[cut2], poland$y[cut2 + 1], mid)< o:p>
< o:p>
upperx <- c(x.first,poland$x[upper],x.last)< o:p>
uppery <- c(mid, poland$y[upper], mid)< o:p>
polygon(upperx, uppery, col=“white”)< o:p>
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