Re: [OpenMap Users] applet / image server

Hi Ben,

Wild guess suggestion. If you fix the zoom, then mapping from xy to
lon lat is easy (you said). Why is that? Because you know the
mapping a priori. How about throwing an extra query in to the OpenMap
back end to also give you the new (lon,lat) pairs for the corners of
your new zoomed/panned/reprojected/whatevered image. Then you have a
rough equivalence again between xy and lonlat. You just have to feed
these values to the applet. If you are using a templating system for
your webpage, you can pass those as variables to the template, and
your applet is good to go. If you aren't using a templating system,
well, I dunno. Start using one?

Good luck,

James E. Marca

At approximately Tue, Feb 24, 2004 at 11:22:16PM -0600, Ben Podoll wrote:
> Hi,
>
> I was hoping to use an applet (light weight version of the OpenMap's applet)
> that just basically can use a "plugin" to be the display...
>
> I had thought of writing my own code to handle user clicks for zooming and
> stuff and use OpenMap as the backend to just dish up the images. This was
> due to the fact that the openmap.jar (required for the applet) as well as
> many of the things that come along with the applet version was not needed.
>
> But now I was trying to figure out a way to do a hybrid version of the
> above, by still allowing myself to write a light weight applet but use the
> OpenMap functionality as the content pane of the applet per se.
>
> The problem I had with writing my own code was the fact that a user could
> click on the image produced and I would have to map x,y to lat,lon to figure
> out where they clicked... This was ok if I set the zoom level but if I allow
> zoom levels that get much more difficult.
>
> If I can use what OpenMap has already done, as far as allowing the user to
> zoom and pan etc. it would be great!

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