[mapserver-users] Mapserver + Openlayers legend problem

[Fawcett, David]

An embedded scale bar is just not going to work with an OpenLayers type
of interface.  (unless, I guess, you use the single, non-tiled layer
type in OpenLayers.  But then you aren't going to get the cool Googley
Goodness slippy map effect.
http://www.openlayers.org/dev/examples/mapserver_untiled.html )

The problem is that OpenLayers splits your map window request up in to
little tiles.  This allows it to easily add more tiles outside of your
map window, giving that seamless appearance.  When OpenLayers requests
all of the tiles for your map, each tile is an individual call to
MapServer and your MapServer doesn't know that all of these request are
related, they are just requests.  

So, if you have an embeded scalebar or legend, it will show up in each
tile.  If you are using OpenLayers, there might be a way to place a
legend graphic on top of your map, kind of like the overview map.
http://www.openlayers.org/dev/examples/overviewmap.html  Otherwise, you
may just want to have a spot outside of the map div where you show a
legend.  

David.

-----Original Message-----
From: mapserver-users-bounces at lists.osgeo.org
[mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of
ptang83 at yahoo.com
Sent: Monday, April 14, 2008 11:20 AM
To: mapserver-users at lists.osgeo.org; Emilio Ponce
Subject: Re: [mapserver-users] Mapserver + Openlayers legend problem


I have the same issue in openlayer + mapserver cgi. However, if I use
mapscript without openlayer, then it works fine. 


--- On Mon, 4/14/08, Emilio Ponce <yosoycore at gmail.com> wrote:

> From: Emilio Ponce <yosoycore at gmail.com>
> Subject: [mapserver-users] Mapserver + Openlayers legend problem
> To: mapserver-users at lists.osgeo.org
> Date: Monday, April 14, 2008, 10:17 AM
> Hi everyone,
> 
> I'm beggining with mapserver + openlayers.
> The problem is that I cannot show a legend of my layers, because if I 
> use the 'LEGEND keyword' into the mapfile, the legend
> is shown on every tile of
> the openlayers's map.
> I've found the same problem for the SCALEBAR.
> 
> The definition of the LEGEND in the mapfile is simple:
> 
>     LEGEND
>         STATUS EMBED
>         POSITION LR
>         TRANSPARENT TRUE
>     END
> 
> And you can see the problem here: 
> http://www.ietcat.org/htmls04/cat/PDF_PTMB/legend_problem.gif
> 
> Does anyone know how to solve this repetition problem?
> 
> Thanks a lot!
> 
> 
> 
> 
> --
> Emilio_______________________________________________
> mapserver-users mailing list
> mapserver-users at lists.osgeo.org
> http://lists.osgeo.org/mailman/listinfo/mapserver-users


 
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