[R-sig-Geo] Better label placement for polygons

[Barry Rowlingson]

Nice, is it the same method as this:

http://proceedings.esri.com/library/userconf/proc01/professional/papers/pap388/p388.htm

Barry

> Surprisingly, the resulting R code is quite fast (no doubt due to the
> very efficient rgeos package!). For a simple polygon it takes just a
> fraction of a second. And it can calculate label position for all the
> polygons in the ‘rworldmap’ world polygons in a few seconds. The
> resulting label placement also seems very good. Here’s the code:
>
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