[Kstars-devel] earth orbiting spacecraft with TLE, SGP4 and SDP4

[Jason Harris]

Hi Bernard,

Glad to hear from you.  There's no recommended environment for kstars; 
many of us do use KDevelop, but it isn't required.

Unfortunately, you will probably need the latest development code to add 
this feature to KStars.  The reason is, that we have totally reorganized 
the way we handle the collection of objects that get drawn in the map.

We are now using a "Component/Composite" design pattern, which optimizes 
modularity and code reuse.  Basically, any entity that is drawn in the 
map is represented as a Component class (e.g., AsteroidsComponent, 
StarsComponent, SunComponent, etc).  Each Component takes care of 
updating and drawing itself to the SkyMap.  If you download the code 
from SVN trunk, you can examine the existing code in 
kstars/kstars/skycomponents to see how it works.  There's also a README 
file in that directory that explains it all in more detail.

The problem is: currently, trunk is not compilable.  I've been working 
on it whenever I have a spare moment, and it's getting close, but we're 
not there yet.  The good news is that the skycomponents directory does 
compile, so you can add your files there and at least get it compiling.

So, it's sort of a messy time to join us, but don't let that stop you! 
KStars under Qt4 is going to be really cool, and it would really be 
great to have the satellites in there.

Feel free to email the list or any of us with questions (Thomas and I 
probably know the most about the Components stuff at this point).

thanks,
Jason

Bernard GODARD wrote:
> Hi all,
> 
> I have written a C++ library for deriving earth-orbiting satellites'
> position from NORAD's TLE with the SGP, SGP4, SDP4, SGP8 or SDP8
> methods, based on Dominik Brodowski SGP C library (which is itself
> based on Dr TS Kelso NORAD Pascal library).
> 
> I would like to try and implement this in KStars.
> 
> Could you please tell me what is the recommended environment for
> developing KStars?
> Is it kdevelop? There is a kdevelop project file in the source tarball
> I have downloaded.
> I have kdevelop 3.2.2.
> Should I use the latest sources from the subversion repository? For
> now, I have the kstars-1.1-p1.tar.bz2 tarball.
> Once compiled, is it possible to run the program for debugging
> purposes without interfering with the data from the already installed
> KStars (from a distribution package)?
> 
> Thanks for your help,
> 
>                              Bernard
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