[Qgis-developer] Labelling in QGIS Server/Lizmap

[Andrea Peri]

Hi,
our webgis framework "Tolomeo" multilayer and multiwms is working like this.

It group all the layers in one only service GetMap request for every service.
But when the tree is filled with layer coming from different wms services.
It must split also for service and for layer.

So is quite impossible to have 1 only request , but often there are
3-4 request everyone with more than one layer instead of 20-30
requests.

Another question is if the user move the order of the layer up or down
in the tree.
The framework should recognize this and change the splitting of the
request to support the new order.

Another question is if the user request some client operation like put
a transparency on a layer.
This mean that that laywe should request separatly from the other to
allow after the change of transparency on the client side.

This to explain that the question can rapidly increase in complexity.

Regards,
A.


2016-10-21 11:22 GMT+02:00 Richard Duivenvoorde <rdmailings at duif.net>:
> On 21-10-16 11:12, Paolo Cavallini wrote:
>> Hi René,
>>
>> Il 21/10/2016 10:46, René-Luc Dhont ha scritto:
>>
>>> It's not a qgis server issue!
>>> It's just the way lizmap querying QGIS Server: One layer at a time! So
>>> impossible labelling checking under multiple layer.
>>> If you want exactly the sae rendering has QGIS, lizmap has to implement
>>> a way to query all the layer in 1 request.
>>
>> thanks for clarifying. I understand the issue - how hard would it be to
>> implement it? Any plans to do it in the foreseeable future?
>
> Not sure if this would work for you Paolo, but IF all layers come from
> the same service, the web-client could try to collect all layers from
> that service in the right order and fire it as one WMS request.
>
> BUT off course this makes it more difficult to implement a layertree in
> which you want to be able to show/hide individual layers. You will have
> to fire the layer collection EVERY time the visibility of one of the
> layer changes. ( I once coded a java-applet doing this :-) )
>
> IF it is a one service project, this seems a viable option to implement?
>
> Regards,
>
> Richard Duivenvoorde
>
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Andrea Peri
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qwerty àèìòù
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