On Sat, 2002-02-16 at 10:28, Michael T. Garrison Stuber wrote: > Greetings! > > I am interesting in writing a (small) family of reports to track > investments. One of the critical needs for what I want to do is a line > graph. I've been studying the current reporting architecture and trying > to understand it. If I understand things correctly, GnuCash has > implemented its own Scheme wrappers around Guppi, and Guppi provides the > graphing functionality. Is this correct?
Sort of. We use Guppi to graph, but guppi is not called from scheme directly. Scheme data describing the graphs is passed to C routines in src/gnome/*guppi*. But a number of other C functions are wrapped and used directly in Scheme. See the *-spec.scm wrapping descriptions in the various directories. > I need several pointers to come up to speed: > > (1) Can somebody explain (or point me to an explanation) of how Scheme > and C interact? It's pretty clear in the code that certain Scheme file > connect to certain C files, but I'm still confused on the mechanics. Study the -spec files to understand the connection between scheme routines and C routines. > (2) Is there a decent explanation on Guppi out there? The > documentation is pretty form of the include files at this point. I tried > searching for FAQ but couldn't find one. While I understand that I can > always read the source, I'm still trying to wrap my head around GnuCash, > so if there's a "this is what this call does, and here's how you use it" > document out there, I'd appreciate a link. I don't think there's much documentation on using Guppi. dave
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