[R] fill the area outside a polygon
dusa.adrian at unibuc.ro
Thu Dec 3 10:56:17 CET 2015
On Wed, Dec 2, 2015 at 10:38 PM, Michael Sumner <mdsumner at gmail.com> wrote:
> On Wed, 2 Dec 2015 at 23:10 Adrian Dușa <dusa.adrian at unibuc.ro> wrote:
>> Dear All,
>> I know how to fill a polygon, using a basic R graphics device:
>> par(mai=c(0, 0, 0, 0))
>> plot(1:100, type="n")
>> polygon(c(20, 80, 80, 20), c(20, 20, 80, 80), col="lightblue")
>> But let's say I have an outer polygon like this:
>> polygon(c(0,100,100,0), c(0,0,100,100))
>> Is it possible to fill the area between the two polygons?
> Try polypath with the evenodd rule (vs. the winding rule):
Oh, that is sweet!
I didn't even know about the polypath() function. Time to study now...
Thanks a lot!
University of Bucharest
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050663 Bucharest sector 5
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