Re: Animating bitmaps on openmap

I was thinking that the timer would just be used to kick off the swing
worker query to check the database for any data, if you wanted to do it real-time.

- Don

James Edward Marca wrote:
>
> I recommend not using a timer, but rather somehow storing or buffering
> the gps data, then using the UTC timestamp on the GPS data to
> make the plotting smooth. I send my GPS data to a database, which
> solves lots of problems communicating with a variable number of remote
> wireless gps devices. Then my applet talks to the database. If there
> isn't any data, nothing gets plotted. if there is lots of data, a chunk of
> time (I think 1minute for real time, or more if it is historic data being
> plotted at faster than real time) is requested from the db, and
> is plotted when the animator time is greater than the UTC timestamp. different
> gps units are stored in different vectors but handled in the same animator
> loop/db request.
>
> I copied the swing worker stuff from the earthquake layer code to set up
> my db request (actually, I call a cgi program on my web server....) I fire
> off a new swing worker when the current vector of reserve data is being
> plotted (I have 1+ minute of data in reserve or being requested at all
> times when i am plotting historical data, but for live data the reserve
> vector in practice is usually empty, waiting for the remote units to send
> in their positions.)
>
> james marca
>
> >From Mark Bucciarelli, received Wed, Jun 20, 2001 at 12:28:54PM -0700:
> > You could add a thread to a location layer handler that goes back and
> > requeries for the location(s) position(s) every so-many milliseconds.
> >
> > --
> > Mark Bucciarelli Peregrine Systems, Inc. R&D, Boston
> > (413) 253-0020 mbucciarelli@peregrine.com Yahoo: m_bucciarelli
> > http://www.peregrine.com
> >
> > > -----Original Message-----
> > > From: John Mairs [mailto:mairsj@oso.nrl.navy.mil]
> > > Sent: Wednesday, June 20, 2001 1:59 PM
> > > To: openmap-users@bbn.com
> > > Subject: Animating bitmaps on openmap
> > >
> > >
> > > Hi Folks,
> > >
> > > I'm trying to setup a simple experiment using Openmap.
> > > Imagine a scenario
> > > where you are using Openmap to track a GPS receiver, say in
> > > someone's car or
> > > in an airplane. My first step is to simply display a bitmap.
> > > I already
> > > have a Windows bitmap; i.e. bmp file, that I would like to
> > > use. I noticed
> > > some JPEG helpers in the API but nothing explicity stating
> > > bitmap or bmp.
> > > Seems to me this code would make up a "layer" and that
> > > somebody else must
> > > have done this already.
> > >
> > >
> > > Next question is how do you animate it moving on the map? Most of the
> > > examples I have seen have been with "static" data. From an object
> > > orientated sense I have a couple of different objects that
> > > all know their
> > > current location and they need to draw themselves. I guess
> > > my question is
> > > what is the trigger that would model an icon/bitmap slowly or
> > > quickly moving
> > > along a road on a digital map? Any code fragments or
> > > examples out there?
> > >
> > > Thanks,
> > >
> > > John
> > >
> > >
> > >
>
> --
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