[Xastir-dev] args to data_add()

[Owen DeLong]

I, for one, think this would be amazingly cool!!!

I hadn't heard of FlightGear until this, but, I'll definitely be checking 
it out.
I've been bemoaning the fact that there weren't any good non-windows flight
simulators available for some time now.

Xastir could become a very cool moving map, and, recruiting that community 
into the
Xastir fold could bring in some developer resources that have expertise on 
things we
need (especially as we start looking at autorouting, more SAR features, 
etc.).


Owen


--On Friday, April 09, 2004 12:28:00 -0700 "Curt, WE7U" <archer at eskimo.com> 
wrote:

> On Fri, 9 Apr 2004, Wendell Turner wrote:
>
>> What are the arguments to db.c:data_add() ?
>
> I'd have to go into the code to see, just like you'll have to.
>
> You can look for instances where data_add() gets called, and
> back-track to the types of parameters from there.
>
> Note that the lat/long values we use are in the Xastir coordinate
> system, they're not what you're used to.  The transformations
> between normal lat/long and our coordinates are very straightforward
> though, and we have several examples of that in the code.
>
>
>> If I want to place a (moving) target on the map, it looks like
>> type should be some indicator that says data will contain either
>> a gps sentence or some other lat/long/alt encoding.  Correct?
>
> If you just want to throw an object onto the screen, there's an
> easier way.  You can put a simulated APRS sentence right into our
> decoding and then tell Xastir that there's something there.  It will
> then go through the normal decoding routines and you won't have to
> do anything special.
>
> Look at the very end of interface.c:output_my_data().  You'll see
> this line:
>
>   decode_ax25_line( data_txt, DATA_VIA_LOCAL, port, 1);
>
> That will throw a text line right into the decoding logic.  The APRS
> specification is on www.tapr.org, which will help you to figure out
> the correct sort of APRS string.
>
> Depending on what accuracy you require, you might consider using
> APRS Compressed position reports, which give you higher resolution
> than normal DD MM.MM APRS posits, or perhaps use NMEA sentences with
> DD MM.MMM or DD MM.MMMM posits.
>
>
>> (Sorry, but I don't do radios, just aircraft.  However, now with
>> the ability to use FAA sectionals, it should be easy to use
>> xastir as a moving map display for the FlightGear
>> (www.flightgear.org) simulator.  Would the xastir community be
>> interested in those patches?)
>
> If it would serve a purpose and wouldn't interfere with what we're
> doing I don't see a big reason to reject it.  Some of the other
> developers may have a different opinion on it though.  I guess we'll
> see what other responses you get.
>
> --
> Curt, WE7U			    archer at eskimo dot com
> Arlington, WA, USA		http://www.eskimo.com/~archer
> "Lotto:    A tax on people who are bad at math." -- unknown
> "Windows:  Microsoft's tax on computer illiterates." -- WE7U
> "The world DOES revolve around me:  I picked the coordinate system!"
> _______________________________________________
> Xastir-dev mailing list
> Xastir-dev at xastir.org
> https://krypton.hscs.virginia.edu/mailman/listinfo/xastir-dev