[Geoprisma-dev] maxextent on OSM

[Yves Moisan]

  Le 2010-08-31 13:22, Alexandre Dube a écrit :
> Yves,
>
> Ok, it would seem that defining a 'maxExtent' option to the 
> OpenLayers.Map object automatically set the maxExtent of the layers 
> added, but not the XYZ (OSM) ones.  They are automatically calculated 
> and ignore the one from the map.
Hi Alexandre,

My understanding is that the maxExtent works on regular WMS layers 
because we have control over the service.  Another fellow showed me how 
he could not do a maxExtent on a Google layer, so it looks like all 
services over which we have no control we can't set an arbitrary 
maxExtent to them.

I found on the OpenLayers example site how they use setCenter with a 
zoom level : http://openlayers.org/dev/examples/osm-google.html.  To me 
this shows we can't just set another maxExtent in the map object if we 
have a gymo type map.  Could it be that if we specified a maxExtent for 
a layer the code in GP would trigger a setCenter ?

This is a bugging issue for us because I'm trying to push the use of OSM 
as a baselayer but if we can't open the map zoomed over a specific area 
(which we can normally do in WMS by setting the service maxExtent) then 
that's a turn off.

Ideas appreciated.

Yves