On 2010-01-06 17:10, steve.tout...@inspq.qc.ca wrote: > > Thanks for this alternative Andreas. > > I don't know much about sld but I read some threads and it seems to be > the right solution. I'll try to find some goog examples.
>From http://presentations.opengeo.org/2009_FOSS4G/gx_tutorial.zip, gx_tutorial/doc/more_ogc/app.html: var owsUrl = "/geoserver/ows"; var wms = new OpenLayers.Layer.WMS.Post("WMS", owsUrl, {format: "image/png"}, {visibility: false} ); var rule = new OpenLayers.Rule({ filter: new OpenLayers.Filter() // your filter here) }); rule.symbolizer["polygon"] = symbolizer; // for polygons, otherwise "point" or "line" var style = new OpenLayers.Style("", {rules: [rule]}); wms.mergeNewParams({ sld_body: new OpenLayers.Format.SLD().write({ namedLayers: [{ name: "foo", // your layer name here userStyles: [style] }] }) }); Regards, Andreas. > It never ends...Always something new to learn > > Thanks > Steve > > /Steve Toutant, M. Sc./ > Analyste en géomatique > Secteur environnement > Direction de la santé environnementale et de la toxicologie > Institut national de santé publique du Québec > 945, avenue Wolfe > Québec, Qc G1V 5B3 > > Tél.: (418) 650-5115 #5281 > Fax.: (418) 654-3144_ > __steve.tout...@inspq.qc.ca_ <mailto:steve.tout...@inspq.qc.ca>_ > __http://www.inspq.qc.ca_ <http://www.inspq.qc.ca/> > > > > > > > *Andreas Hocevar <ahoce...@opengeo.org>@openlayers.org* > Envoyé par : users-boun...@openlayers.org > > 06/01/2010 10:35 AM > > > A > users@openlayers.org > cc > > Objet > Re: [OpenLayers-Users] geojson - Performance issue > > > > > > > > > > > > Hi, > > 2000+ features is way too much for rendering in the browser. > > if you use mapserver already, then you can also query the layer as WMS > layer, using sld_body with a filter. If your query is complex, use > Layer.WMS.Post instead of Layer.WMS to avoid urls that are too long > for IE. > > Regards, > Andreas. > > On 2010-01-06 16:29, steve.tout...@inspq.qc.ca wrote: > > > > Hi, > > I created a WMS (mapserver) layer containing 13400 polygons. It loads > > in less then 3 seconds. Good. > > > > I need to develop a tool for the user so he can create a custom query > > on this layer to retreive specific polygons. In a form, the user > > select the parameters and launch the request. Here is the code below. > > That works, but it takes minutes to render. Per example, a query that > > returns 2482 polygons, In firebug I see that the query runs in less > > then 2 seconds. > > But, It seems that the creation of the geometries is an heavy task. I > > get this warning in FF > > > > > > I click on Continue several times and then I get geometries in the map. > > > > I guess 2482 polygons is simply too much for a vector layer. If that > > is the case, is there another format then GeoJson I could use? Maybe > > my approach is totally wrong... > > > > Any comments would be appreciated. > > Thanks for your help, > > Steve > > > > The code used: > > > > Ext.Ajax.request({ > > url: 'requeteVulnerabilite.php', > > method:'POST', > > params: { inddef: cb_inddefValue}, > > failure: function(){alert("Ca pas marché");}, > > success: function(result, request ) > > { > > //alert(result.responseText); > > vulnerabiliteLayer.destroyFeatures(); > > var features = new > > > OpenLayers.Format.GeoJSON({'internalProjection':map.baseLayer.projection,'externalProjection':map.baseLayer.projection > > > > > > }).read(result.responseText); > > var bounds; > > if(features) > > { > > if(features.constructor != Array) { > > features = [features]; > > } > > for(var i=0; i<features.length; ++i) { > > if (!bounds) { > > bounds = > > features[i].geometry.getBounds(); > > } else { > > > > bounds.extend(features[i].geometry.getBounds()); > > } > > } > > vulnerabiliteLayer.addFeatures(features); > > map.zoomToExtent(bounds); > > } > > > > } > > }); > > > > > > > > > > /Steve Toutant, M. Sc./ > > Analyste en géomatique > > Secteur environnement > > Direction de la santé environnementale et de la toxicologie > > Institut national de santé publique du Québec > > 945, avenue Wolfe > > Québec, Qc G1V 5B3 > > > > Tél.: (418) 650-5115 #5281 > > Fax.: (418) 654-3144_ > > __steve.tout...@inspq.qc.ca_ <mailto:steve.tout...@inspq.qc.ca>_ > > __http://www.inspq.qc.ca_ <http://www.inspq.qc.ca/> > > > > > > > > > > _______________________________________________ > > Users mailing list > > Users@openlayers.org > > http://openlayers.org/mailman/listinfo/users > > > > > -- > Andreas Hocevar > OpenGeo - http://opengeo.org/ > Expert service straight from the developers. > > _______________________________________________ > Users mailing list > Users@openlayers.org > http://openlayers.org/mailman/listinfo/users > > > -- Andreas Hocevar OpenGeo - http://opengeo.org/ Expert service straight from the developers. _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users
