On Thursday, February 11, 2010, Matt Williamson <matthe...@gmail.com> wrote: > Eric, > > Ah, thanks for this--you hit on part of my misunderstanding, that not all > strategies in trunk are clustering strategies. I didn't realize that the BBOX > strategy actually loaded more data from the server. > > So I experimented with the BBOX strategy, and unfortunately it doesn't really > fit my needs, for two reasons. > > One (the lesser), I have a problem with data density--if I just select the > top (most "interesting") 150 points in the BBOX, they may all be in one > place. Consider Salt Lake City, Utah, which is a large city in the middle of > mountain wilderness. If I center the map showing Utah, I get 150 points in > Salt Lake City, and none in the mountains--I'd like to be able to display > points in data-sparse areas, even if they're lower priority points, when > there is room. My tile generation routine uses a computationally expensive > mechanism to fill those gaps--but if I can pre-generate them, then there's no > real-time cost. > > Two (the greater), the BBOX strategy does not load more points when zooming > in. If the map starts centered on Utah, then the user zooms out to the whole > U.S., then zooms back in on Texas, it doesn't load new points, because the > zoomed-in BBOX is still within the old zoomed-out BBOX. Since the new > viewport is still within the last gathered dataset, it does not attempt to > get more features. If there's a way to configure the BBOX strategy so this is > not the case, please let me know!
set resFactor to 1, look at the API doc to understand that option. > > So, am I to assume from your comments that the BBOX strategy is still a valid > option? Do you happen to know if it still even works with 2.8 or will with > 2.9? And/or, that functionality hasn't been merged into some other object in > the mainline trunk or otherwise made obsolete by some other new > functionality? I just don't want to invest in obsolete or orphaned code, > especially if there's something better. The BBOX strategy is in 2.8 and trunk, the Grid strategy is just in the vector-behavior sandbox as noone as shown interest in pursuing the work on that Grid strategy. Cheers, -- Eric Lemoine Camptocamp France SAS Savoie Technolac, BP 352 73377 Le Bourget du Lac, Cedex Tel : 00 33 4 79 44 44 96 Mail : eric.lemo...@camptocamp.com http://www.camptocamp.com _______________________________________________ Dev mailing list Dev@openlayers.org http://openlayers.org/mailman/listinfo/dev
