[R] windows common dialog for color selection in R

[ripley@stats.ox.ac.uk]

Perhaps I can elucidate.  The `color picker' is in the glossary as

  Color common dialog box
  A common dialog box that displays available colors and controls that let
  the user define a custom color.

and it is accessed using function ChooseColor in the comdlg32.dll.

I presume Simon wants a colour returned as an RGB value in some encoding
(R's and Windows' differing here).  I think by far the easiest way to do
this is to write a small package with some C interface code along the
lines of the windlg package, and there are lots of examples in the
R source code, for example in src/gnuwin32/graphapp/dialogs.c.


On Tue, 21 May 2002, Uwe Ligges wrote:

> "Gatehouse, Simon (E&M, North Ryde)" wrote:
> >
> > Dear R users,
> > I run R on windows 2000 and windows 98
> > I am seeking opinion, or better still a code snippet, on what might be the
> > quickest, not necessarily the best or preferred way, of making the Windows
> > color selection common dialog available in R. Would it be an executable
> > called with system() or shell() or perhaps a tcltk module or have I missed
> > something obvious?  I don't believe that I have the experience or time at
> > this stage to try a dynamic link as outlined in FAQ.
> > Any comments would be most welcome.
>
> I don't know what the "Windows color selection common dialog" is, but I
> guess you have to link to the appropriate windows dll.
> With system ans shell you can start programs that can be executed from
> the windows command shell as described in the help files. So if you can
> start that dialog out of the shell (and that's not a R specific
> question), you can start it from R as well.
> I wonder what you are going to do with such a dialog?
>
> Uwe Ligges
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-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
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