[R] How to draw holes generated by gpclib using plot function

[Roger D. Peng]

Sorry, but this limitation in plotting is something that I probably 
should have mentioned in the help page.  At the time when I wrote this 
plotting wasn't really a priority so I never thought much of it.

The GPC C library has a function has a function to return a collection 
of tristrips but this is not implemented in the R package.  It 
shouldn't be too difficult to include and I will hopefully include it 
with the next release.

-roger

Hisaji ONO wrote:
> Hi.
> 
>  I've tried to create a polygon with one hole by gpclib using following
> example script.
> 
>  holepoly <- read.polyfile(system.file("poly-ex/hole-poly.txt", package
> ="gpclib"), nohole = FALSE)
>  area.poly(holepoly)
>  plot(holepoly,poly.args=list(col="red",border="blue"))
> 
>  And I noticed plot function couldn't draw polygons with holes correctly.
> 
>  Does anyone know how to solve this situation?
> 
>  Regards.
> 
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