R help - Apr 2009 - does grid.rect() not accept NULL argument from gpar(col=NULL) ?

I want to draw a grid rectangle without a border.

?gpar says:

"Specifying the value NULL for a parameter is the same as not specifying
any
value for that parameter, except for col and fill, where NULL indicates not
to draw a border or not to fill an area (respectively)." 

pushViewport(viewport(height=unit(.8, "npc")))
	grid.rect(gp=gpar(col=NULL, fill="green"))
popViewport()

Still a border is drawn. What am I doing wrong?

TIA, Mark

Hi


Mark Heckmann wrote:
> I want to draw a grid rectangle without a border.
> 
> ?gpar says:
> 
> "Specifying the value NULL for a parameter is the same as not
specifying any
> value for that parameter, except for col and fill, where NULL indicates not
> to draw a border or not to fill an area (respectively)." 
> 
> pushViewport(viewport(height=unit(.8, "npc")))
> 	grid.rect(gp=gpar(col=NULL, fill="green"))
> popViewport()
> 
> Still a border is drawn. What am I doing wrong?

Your mistake was to assume that the documentation is correct! :)

That behaviour is actually WAY out of date.  You can do what you want
using NA ...

pushViewport(viewport(height=unit(.8, "npc")))
grid.rect(gp=gpar(col=NA, fill="green"))
popViewport()

Thanks for reporting the problem (the docs are now fixed).

Paul

> TIA, Mark
> 
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