Hi
It seems that it still works.
x<-c(3,7,7,3)
y<-c(4,4,6,6)
par(bg="pink")
plot(1:10,1:10)
polygon(x, y, border=TRUE, col=0)
> version
_
platform i386-pc-mingw32
arch i386
os mingw32
system i386, mingw32
status Under development (unstable)
major 2
minor 16.0
year 2012
month 03
day 03
svn rev 58569
language R
version.string R Under development (unstable) (2012-03-03 r58569)
>
Regards
Petr
> -----Original Message-----
> From: r-help-boun...@r-project.org [mailto:r-help-bounces@r-
> project.org] On Behalf Of Terry Therneau
> Sent: Thursday, September 27, 2012 2:37 PM
> To: r-help@r-project.org
> Subject: [R] erasing a polygon
>
> I'm updating some (very) old code, and one particular option of its
> plot method depends on a once-was-true trick
> polygon(x, y, border=TRUE, col=0)
> polygon(x, y, border=TRUE, density=0)
>
> would draw the polygon AND erase whatever was underneath it back to
> background color.
>
> Is there a reliable way to do this with the current R (standard
> graphics)?
>
> Terry Therneau
>
> PS For the inquiring, the routine is text.rpart with the fancy=T
> option, and the original target was the postscript driver on Splus 3.4.
> (I said it was old.) The plot.rpart routine draws the branches, and
> text.rpart then wants to lay down some ellipses, erasing what is
> underneath them.
>
> ______________________________________________
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> PLEASE do read the posting guide http://www.R-project.org/posting-
> guide.html
> and provide commented, minimal, self-contained, reproducible code.
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