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

[Paul Spencer]

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/