Andreas Hocevar wrote: > Alexandre Dube wrote: > >> Hi devs, >> >> I want to discuss about a new feature on Layer.Vector : multiple data >> sources depending on the zoom level. >> >> I already developped something very similar : >> http://dev4.mapgears.com/bdga/bdgaWFS-T.html At zoom level 0 to 3, you >> will see vector polygons ( regions ). Each level comes from a different >> source that has been normalized to improve the rendering speed. So, >> each zoom level has its own vector layer and they are all hidden from >> the layer switcher. They are controlled by a dummy layer. >> >> At first, I thought this was cool, but now that I think about it, a >> single type of data, the Quebec regions on my example, should be >> displayed on a single layer. If I want to interact with my data the way >> it is now, I need to look at 4 different layers and keep track of a >> dummy layer also. A single vector layer with the possibility to give it >> multiple data sources depending on the zoom level would be much better. >> What do you think ? It could be a nice upgrade. >> >> > > It should be easy to customize the strategy you are using (I assume > Fixed or BBOX) to change the url and/or params of the protocol on the > zoomend event (similar to the moveend event handler in the BBOX > strategy). This strategy would then have to know the urls/params for > each zoom level, and you would just interact with one vector layer. > > Regards, > Andreas. > > Exactly. It's a common practice on the web to have data normalized by scales, so it would be quite useful to have such an upgrade.
So, you would modify both BBOX and Fixed ? Do others have opinions about it ? -- Alexandre Dubé Mapgears www.mapgears.com _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
