Re: [Stellarium-pubdevel] Plugin / Date question

[F. C. <fab...@go...>]

On Thu, Jul 17, 2008 at 3:19 PM, Steve Ingamells <st...@in...> wrote:
> Hi Matthew,
>
> I had looked at setJDay but it didn't seem to be what I was looking for -
> but since you recommend it, I will look again and try it! I have the time
> and date as a QTime and a QDate already, so it should work out OK.
>
> The plugin is for Windows (or at least, it is to begin with; I would like to
> do it in Linux soon!). I did have several problems with my original code and
> the latest SVN revision, so I scrapped it and started again with the basic
> HelloStelModule. This gave me a few problems but once I remembered that the
> config.h file wasn't in the include path (I ended up copying it to the
> builds/msys folder for my plugin) things went better.
>
> Also, I found that there's a reference to VirGO instead of HelloStel in the
> CMakeLists.txt file (in an #ifdef WIN32 section), and I had to change the
> default folder names to builds/msys instead of builds/unix (we discussed
> this several months ago..) There may have been a couple of other little
> things.
>
> I originally tried using QT sockets and QT XML but I had library linking
> problems there, as the libs for these are not, apparently, included in the
> default QT setup, and I could not be bothered to mess with that! I notice
> that Winsock / Unix sockets are used in the telescope code so I figured that
> the developers didn't bother with QT there either.

I strongly encourage you to use Qt XML and Qt Network features. It
would save you a lot of time!
It is very easy to activate the xml module in your plugin (I do it in
VirGO, so look at the SVN code in extmodules/), just change the
CMakeList.txt by adding:

########### Find packages ###########
SET(CMAKE_MODULE_PATH ${PROJECT_SOURCE_DIR}/cmake)
FIND_PACKAGE(Qt4 REQUIRED)
SET(QT_USE_QTOPENGL TRUE)
SET(QT_USE_QTNETWORK TRUE)
SET(QT_USE_QTXML TRUE)
INCLUDE(${QT_USE_FILE})

Of course this will work only if you use cmake to compile.
Cheers,
Fabien

> The idea of the plug-in is to allow passenger in the ship's VIP lounge to
> see a representation of the sky as it should appear in front of them, so
> they can find out which star / planet is which, etc. So Stellarium needs to
> be told where the ship is, which way it's heading, and what time/date it is!
> We already have this data in our infomation syhstem server, and the plug-in
> will poll the data from a socket on the server in XML form, and convert it
> to Stellarium coordinates, etc.
>
> I'll let you know how it goes - I think we install the first one late this
> year. We are not charging the customer for the Stellarium part of the system
> - it's more of a deal-clincher -  but I am trying to get the boss to make a
> donation to the project :-)
>
> All the best,
> Steve
>
> "The major difference between a thing that might go wrong and a thing that
> cannot possibly go wrong is that when a thing that cannot possibly go wrong
> goes wrong it usually turns out to be impossible to get at or repair." -
> Douglas Adams
>
> ________________________________
> From: Matthew Gates [mailto:mat...@gm...]
> Sent: 17 July 2008 13:56
> To: St...@in...; Stellarium developers public mailing list
> Subject: Re: [Stellarium-pubdevel] Plugin / Date question
>
> On Thursday 17 July 2008, Steve Ingamells wrote:
>> Hi all,
>>
>> I am, at last, back on the development of a plug-in to link Stellarium
>> with our ship's information system. I note that quite a few things have
>> changed since I last looked at it, and a good program is now even better!
>
> Thanks!  :-)  Development is moving quite well recently.
>
>> However, I have a problem - I need to be able to set the current ship's
>> time and date in Stellarium, and although I can use
>> Navigator::setTodayTime to set the local time, this function retrieves
>> the system time and date and then sets the given time only. I can't see
>> any way to set the date.
>>
>> Before I add anything to Stellarium itself, is there any way to set the
>> date as well as the time?
>
> You can set the date & time using Navigator::setJDay.  The argument is a
> Julian Day value - the integer part of the number is a day serial number
> and the fractional part of the number is the time of day (note that a
> Julian Day starts at midday, not midnight).
>
> You can use StelUtils::qDateTimeToJd to convert a date and time as a
> QDateTime into a Julian Day value.
>
> If, instead of a QDateTime you have separate values for year, month and so
> on, you could copy the method used in DateTimeDialog::valid.
>
> If you are building external modules (plugins) for Windows, please report
> your success/failure here.  I wrote a few minimal examples which you can
> find in SVN, but I only ever tried to build them on Linux.  I'd be
> interested to know how you get on, and if there are any gotchas to look out
> for when building for win32.
>
> I'd also love to hear about your plugin in general - I like the idea of
> Stellarium running on boats.  :-)
>
> Matthew
>
>
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