[Qgis-developer] Contextual WMS legend graphics forgets option

[Andrea Peri]

Hi,
strk, and Paolo.

I can confirm our goal was to have a per-layer option.
Because not all the layers in a wms service are good to have a
contextual legend.

Actually the more layer don't need a contextual legend.
Only few layer with really many layer are this need.

Of course the proebl of a per-layer configuration is to have a web
client capable to do a non standard call.
Meanwhile a per-server configuration will work with every client.
This is why we fund also the capability of qgis to set the wms
provider to do a contextual-client call.

With a per-server configuration this will not need.

But another question about why we prefer a per-client configuration is
that this is the same configuration used by mapserver in it contextual
legend.
nfact we originally use the contextual legend in mapserver and after
see how good it was on some layer we decided to fund to have the same
contextual legend call in qgis-server.

This is a good question fo interoperability to have the same request
in more then one wms server.
This kind of request is surely not standard for ogc but is the same
for mapserver and for qgis-server.
This mean that a wms provider client that can call the contextual
legend on mapserver can call also on qgis-server.

Instead If qgis-server was working with a different kind of request
for contextual legend, it will be incompatibile and this mean that
every client that support the mapserver contextual call don't
conseguentially support the qgis-server contextual call.


The theird question is that a per-client configuration will allow t
have the full legend and also the contextual legend.
Instead aper-server configuration will allow to have always only one
of both legends.

This mean a lesser useful usage. Because not always is useful to have
the contextual legend (also on a lyar with many domains).

Regards,

Andrea.


2015-02-24 17:35 GMT+01:00 Sandro Santilli <strk at keybit.net>:
> On Tue, Feb 24, 2015 at 10:42:40PM +0700, Martin Dobias wrote:
>> Hi Paolo
>>
>> On Tue, Feb 24, 2015 at 10:23 PM, Paolo Cavallini <cavallini at faunalia.it>
>> wrote:
>>
>> > Il 24/02/2015 16:18, Sandro Santilli ha scritto:
>> >
>> > > I wouldn't consider that one a bug. The default is for contextual
>> > > WMS legend to be off (it's not a standard call). Eventually you
>> > > might want a per-server default configuration, but would be
>> > > an enhancement.
>> >
>> > sorry, I do not see your point: if an user chooses to display the legend
>> > for a server, it is more than likely that he will expect further
>> > connections to that server will remember his choice.
>> > but OK, it can be an enhancement.
>>
>> I would even argue that such option should not exist. Most users will
>> probably not understand its meaning. If necessary, such option should be in
>> WMS server configuration dialog, not in the main WMS dialog. Anyway I think
>> QGIS should try to figure it out itself whether the server supports
>> contextual legend.
>
> Contextual legend is a non-standard feature, not sure how QGIS could
> rely on capability info to figure out. Moreover the user might want
> it enabled only for some of the layers. The per-layer option was explicitly
> requested by the funding party (Regione Toscana).
>
> So I would see a per-server option to determine a per-layer default
> (overridable) and eventually an "autodetect" choice for that option in
> case there's a likely-to-work way to do that.
>
> --strk;
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-- 
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Andrea Peri
. . . . . . . . .
qwerty àèìòù
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