Hi Franz, and have you verified you only have a single tile?
Do you have singleTile: true, ratio: 1 and buffer: 0 in your layer options? Best regards, Bart > Hi Bart, > > I'm almost done with my layer implementation. The only problem: my > getURLasync() Method gets triggered far too often (about 3x per pan/zoom > action). > > How can I make sure that getURLasync is only triggered once per map > action? > > Franz > > 2010/8/3 Bart van den Eijnden (OSGIS) <bart...@osgis.nl> > >> Hi Franz, >> >> check out OpenLayers.Tile.Image. >> >> Best regards, >> Bart >> >> > Hi Bart, >> > >> > thanks for the fast and helpful response! >> > >> > One question though: which class actually invokes the methods >> > OpenLayers.Layer.ArcIMS.getUrl and OpenLayers.Layer.getUrlAsync? >> > >> > They seem to be overriden methods, but i couldn't find them in >> > OpenLayers.Layer.Grid or OpenLayers.Layer.HTTPRequest. >> > >> > kind regards, >> > >> > Franz >> > >> > 2010/8/3 Bart van den Eijnden (OSGIS) <bart...@osgis.nl> >> > >> >> Hi, >> >> >> >> I would advise you to look at OpenLayers.Layer.ArcIMS which uses a >> >> similar >> >> approach. >> >> >> >> Best regards, >> >> Bart >> >> >> >> > Hi, >> >> > >> >> > I'm a frontend developer and was programming a web viewer for a >> >> > proprietary, >> >> > WMS-like map service. >> >> > I discovered Openlayers one month ago and I'm really fascinated by >> its >> >> > awesome capabilities, so I decided to integrate our map service in >> >> > OpenLayers. >> >> > >> >> > Here is a short description how the map service works: >> >> > >> >> > The client sends an AJAX request containing the current map bounds, >> >> the >> >> > map >> >> > id and the pixel size of the map. >> >> > >> >> >> map=22&px=1720&py=833&left=2504400&right=2544000&top=5699500&bottom=5669500&type=0 >> >> > >> >> > The server responds with the generated map image (url) and the >> >> corrected >> >> > bounds: >> >> > <MapProperties> >> >> > <mapLeft>2493227.6110444176</mapLeft> >> >> > <mapTop>5699500</mapTop> >> >> > <mapRight>2555172.3889555824</mapRight> >> >> > <mapBottom>5669500</mapBottom> >> >> > <mapType>0</mapType> >> >> > <overviewMap>22</overviewMap> >> >> > <url> >> >> http://localhost/cgmCache/41600065-c3d2-4934-9feb-78a32f6668c8.png >> >> > </url> >> >> > </MapProperties> >> >> > >> >> > The maps are always single-tiled. >> >> > >> >> > My first approach was to write a ProprietaryMapLayer, that executes >> >> the >> >> > map >> >> > request and creates an ImageLayer with the result url and its >> bounds. >> >> > When the ImageLayer is moved, a new request is performed, the >> current >> >> > ImageLayer is destroyed and a new one generated. The disadvantage: >> >> there >> >> > are >> >> > now 2 layers representing one map, which leads to confusion in the >> >> layer >> >> > switcher control. >> >> > >> >> > I read over the code of Layer.WMS, which inherits from Layer.Grid >> and >> >> also >> >> > makes use of Tile.Image, but it's difficult to derive a solution >> from >> >> it, >> >> > since all the request/response handling is already integrated into >> the >> >> > layer. Furthermore, WMS simply responds with tile images, whereas I >> >> have >> >> > to >> >> > deal with an xml response. >> >> > >> >> > Any ideas how I could implement my layer? >> >> > >> >> > kind regards, >> >> > >> >> > Franz >> >> > _______________________________________________ >> >> > Users mailing list >> >> > Users@openlayers.org >> >> > http://openlayers.org/mailman/listinfo/users >> >> > >> >> >> >> >> >> -- >> >> Looking for flexible support on OpenLayers or GeoExt? Please check >> out >> >> http://www.osgis.nl/support.html >> >> >> >> Bart van den Eijnden >> >> OSGIS >> >> bart...@osgis.nl >> >> >> >> >> > >> >> >> -- >> Looking for flexible support on OpenLayers or GeoExt? Please check out >> http://www.osgis.nl/support.html >> >> Bart van den Eijnden >> OSGIS >> bart...@osgis.nl >> >> > -- Looking for flexible support on OpenLayers or GeoExt? Please check out http://www.osgis.nl/support.html Bart van den Eijnden OSGIS bart...@osgis.nl _______________________________________________ Users mailing list Users@openlayers.org http://openlayers.org/mailman/listinfo/users