On 23 Sep 2013, at 15:19, Tomash Brechko <tomash.brec...@gmail.com> wrote:
> Sure I'm aware of this, and please feel free to change the internals at any
> moment without notice (as a last resort I can add an option to the script to
> create its own DB based on navdata - just don't see the reason for this at
> the moment). Moreover I view the script as a temporal stub until the
> information is available somewhere inside FG, my current knowledge of FG
> internals is insufficient to implement it there myself, and having it dirty
> way is better than nothing.
Well, if you need the information *inside* FlightGear, you can ask for an
accessor to be added ….
But, yes, if you're happy with the risk of it all changing, indeed it's easy to
extract information.
>
> Related to this, it would be nice if the function to query magvar for
> arbitrary location would have a Nasal binding (or magvar field in the output
> of geodinfo() or airportinfo(), but this is less efficient if one needs only
> magvar (and less flexible in the case of airportinfo(), though in most cases
> you need to know declination exactly there)). This will allow reporting
> magnetic runway headings in the Airport dialog which I presume is implemented
> in Nasal.
I think you should investigate the magvar() function:
var x = magvar(); # at present aircraft pos
var y = magvar(lon, lat); # guess what this does ….
var z = magvar( <some object retrieved from airportinfo() / navinfo() /
one of the other DB query functions> )
As ever, the problem here is we have no way to auto-document what's exposed to
Nasal. In general reading NasalSys.cxx / NasalPositioned.cxx is a good hint,
though. At this point I've exposed every piece of data that anyone has
requested, I think - there's no backlog of non-exposed data (but, if I have,
adding accessors is easy and low-risk)
Kind regards,
James
------------------------------------------------------------------------------
LIMITED TIME SALE - Full Year of Microsoft Training For Just $49.99!
1,500+ hours of tutorials including VisualStudio 2012, Windows 8, SharePoint
2013, SQL 2012, MVC 4, more. BEST VALUE: New Multi-Library Power Pack includes
Mobile, Cloud, Java, and UX Design. Lowest price ever! Ends 9/20/13.
http://pubads.g.doubleclick.net/gampad/clk?id=58041151&iu=/4140/ostg.clktrk
_______________________________________________
Flightgear-devel mailing list
Flightgear-devel@lists.sourceforge.net
https://lists.sourceforge.net/lists/listinfo/flightgear-devel
