Re: [Plplot-devel] PLplotOO + adding Doug Hunt's "mem" driver

[Joao C. <jc...@fe...>]

On Sunday 23 February 2003 16:52, Rafael Laboissiere wrote:
> As you probably remember, Doug Hunt has develop the great PLplot bindin=
gs
> for PDL (Perl Data Language, see http://pdl.perl.org).  In his package,
> there is also a object oriented module called PLplotOO:
>
>   =20
> http://search.cpan.org/author/DHUNT/PDL-Graphics-PLplot-0.18/PLplotOO.p=
m
>
> It will be great to see this page:
>
>     http://pdl.perl.org/demos/plot2D_en.html
>
> with PGPLOT replaced by PLplot!
>
> PLplotOO was writen for PLplot 5.1.0, but I succeeded to patch it for t=
he
> current CVS sources.
>
> I will completely abandon the Perl5 bindings project that is currently =
in
> CVS.  Doug's approach is far superior than mine and has the big advanta=
ge
> of being PDL-native.  As a matter of fact, instead of the arcane SWIG
> interface that I developped for the Perl5 bindings, the PDL bindings us=
e a
> PDL-specific interface based on a *.pd file.  Much cleaner, much better=
=2E
>
> I will eventually package the PDL bindings for Debian, so that the PLpl=
ot
> suite will be complete for at least one Operational System in the Unive=
rse.
>
> Now, Doug told me that a forthcoming version of the PLplotOO module wil=
l
> need a feature that is present in his patched sources of PLplot: a new
> driver called "mem", which plots into a user-supplied memory space (X, =
Y,
> <R,G,B>).
>
> He send to me the source file mem.c and I integrated it into PLplot's
> source and configuration system.  The only caveat is that this new driv=
er
> needs the addition of a function to the API (in src/plcore.c), called
> plsmem:
>
>     /*
>       Set the memory area to be plotted (with the 'mem'driver) as the '=
dev'
>       member of the stream structure.  Also set the number
>       of pixels in the memory passed in in 'plotmem'.
>       Plotmem is a block of memory maxy by maxx by 3 bytes long, say:
>       480 x 640 x 3 (Y, X, RGB)
>
>       This memory will be freed by the user!
>     */
>
>     void
>     c_plsmem(PLINT maxx, PLINT maxy, void *plotmem)
>     {
>        plsc->dev =3D plotmem;
>        plP_setphy (0, maxx, 0, maxy);
>     }
>
> I have already a version here ready for cvs commit, including the addit=
ion
> of the documentation for plsmem in doc/docbook/api.xml.  However, since
> this adds things to the API (notice that this does _not_ make the libra=
ry
> backwards incompatible), I decided to ask your opinion before I do the
> actual commit.  I do not see problems with the changes, besides the fac=
t
> that a new API function is totally specific to the mem driver.
>
> If you do not care, or if you are silent (I promise to wait for a coupl=
e of
> hours, at least :-) I will cvs commit the changes.

(Half an hour later...)

I see no problem, go ahead.
Joao