[Rd] persp + postscript/pdf (PR#1419)

[ripley@stats.ox.ac.uk]

This is rather a documentation bug which means you are misusing persp().

The shading is done in the colour given by the `col' argument, and that
defaults to NULL.  What NULL means is undocumented, but it appears to mean
par("bg"), and that is transparent on postscript/pdf.  Set a value for
`col' and it works as you expect.

I've changed the default to col = "white" and also ensured that
transparent colours are treated as transparent.

On Thu, 28 Mar 2002 leisch@ci.tuwien.ac.at wrote:

> persp(outer(1:5, 1:5), shade=0.1)
>
> looks nice on the screen, but
>
> postscript()
> persp(outer(1:5, 1:5), shade=0.1)
> dev.off()
>
>
> gives an all black surface.
> same when using the pdf() device. has already been like that in 1.4.0.
>
> .f
>
>
>
>
> --please do not edit the information below--
>
> Version:
>  platform = i686-pc-linux-gnu
>  arch = i686
>  os = linux-gnu
>  system = i686, linux-gnu
>  status = Under development (unstable)
>  major = 1
>  minor = 5.0
>  year = 2002
>  month = 03
>  day = 28
>  language = R
>
> Search Path:
>  .GlobalEnv, package:ctest, Autoloads, package:base
>
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-- 
Brian D. Ripley,                  ripley@stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272860 (secr)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595


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