[R-sig-Geo] Will rgeos support "negative" buffering

[Edzer Pebesma]

AFAICS, rgeos does:

require(rgeos)
Sr1 = Polygon(cbind(c(2,4,4,1,2),c(2,3,5,4,2)))
Srs1 = Polygons(list(Sr1), "s1")
SpP = SpatialPolygons(list(Srs1), as.integer(1))

plot(SpP)
plot(gBuffer(SpP, width=-0.5), col = 'red', add=TRUE)


On 01/26/2012 12:41 PM, hi_ono2001 at ybb.ne.jp wrote:
> Hello.
> 
>  Although geos library package supports "negative" buffering(http://geos.osgeo.org/doxygen/classgeos_1_1operation_1_1buffer_1_1BufferOp.html), any plan to support this function in rgeos's gBuffer?
> 
> 
>   Regards.
> 
> 
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-- 
Edzer Pebesma
Institute for Geoinformatics (ifgi), University of Münster
Weseler Straße 253, 48151 Münster, Germany. Phone: +49 251
8333081, Fax: +49 251 8339763  http://ifgi.uni-muenster.de
http://www.52north.org/geostatistics      e.pebesma at wwu.de