[fusion-users] More than two hierarchy levels in the legend (with MapServer)

[Paul Deschamps]

One other thing unmentioned here is that layer "grouping" allows you
to toggle the visibility status of an entire group through the legend
widget.

Cheers

Paul D.


On Tue, Jun 10, 2008 at 10:36 AM, Paul Spencer <pspencer at dmsolutions.ca> wrote:
> Bernhard,
>
> This restriction comes from the fact that MapServer itself only supports one
> level of grouping via the GROUP keyword in a LAYER object.  The map
> rendering does not specifically use groups, it uses the layers themselves in
> the order they are present in the map file (layer at the top is drawn first,
> subsequent layers are drawn over it - painters algorithm).  Groups are only
> for organising layers in the legend.
>
> Cheers
>
> Paul
>
> On 10-Jun-08, at 8:54 AM, Bernhard Schneider wrote:
>
>> Hello everyone,
>>
>> Digging a bit further, I realised that the code in LoadMap.php
>> (fusion/MapServer/php/) is responsible for restricting the nesting depth to
>> 2. It retrieves the information from MapScript which itself read it from the
>> map file. There is the comment "parent is always not set for mapserver since
>> we can't have nested groups" in the code.
>>
>> Is it the MapServer (MapScript) that imposes the limitation? I wonder
>> whether it isn't just a matter of interpreting the map file from a "client
>> side". The map rendering engine should not worry about nesting levels, it
>> only needs to know which layers are visible and in which order they should
>> be drawn. Aren't the groups mainly (only) there for organising the layers in
>> the legend?
>>
>> Just wondering.
>> Bernhard
>>
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>
>
> __________________________________________
>
>   Paul Spencer
>   Chief Technology Officer
>   DM Solutions Group Inc
>   http://www.dmsolutions.ca/
>
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