[GRASS5] question on D library/functions
Eric G. Miller
egm2 at jps.net
Thu Feb 21 21:10:29 EST 2002
On Fri, Feb 22, 2002 at 12:16:29AM +0100, Andreas Lange wrote:
> while trying to understand more of the internals of the libraries i
> found that the D library and its functions (Dnew, Dclearscreen, Dchoose,
> Derase, Dscreen, Dremove, Dcell) are not mentioned in the programmer's
> manual. Can someone enlighten me? Are these functions only shortcuts to
> the D_ and R_ library calls? Is there any reason that some modules use
> system("d.erase") while others use Derase() and even others use
> D_clear_window() ? What about system() and G_system(), should the
> modules use always use G_system?
As to the D* functions, they're probably little used because they aren't
documented. I know, if I don't find documentation for a thing, I
usually don't use it ('cause if you don't know it exists...). As to
system() vs. G_system(), I dunno. We don't need a G_* whatever for
every damn thing though. I think some of those functions were written
because, at the time, these things weren't reliable across platforms.
If you feel the urge, please write documentation. Even a little
chicken scratch is better than nothing.
Eric G. Miller <egm2 at jps.net>
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