On Aug 3, 2010, at 9:42 AM, ext Franz Buchinger wrote: > Hi Bart, > > yes, I've set these options. I noticed that these multiple requests only > happen when I set transitionEffect: 'resize'.
This is basically expected. The transition effect creates multiple tiles, and since creating images is generally considered to be 'cheap' in OpenLayers -- since images should be served from cache -- we just create more tiles, rather than copying existing ones in any way. So this is by design; if you don't like the design, you'll need to do some more coding to fix it :) -- Chris > I'm using OpenLayers 2.9.1. > > Franz > > > > 2010/8/3 Bart van den Eijnden (OSGIS) <[email protected]> > 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) <[email protected]> > > > >> 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) <[email protected]> > >> > > >> >> 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 > >> >> > [email protected] > >> >> > 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 > >> >> [email protected] > >> >> > >> >> > >> > > >> > >> > >> -- > >> Looking for flexible support on OpenLayers or GeoExt? Please check out > >> http://www.osgis.nl/support.html > >> > >> Bart van den Eijnden > >> OSGIS > >> [email protected] > >> > >> > > > > > -- > Looking for flexible support on OpenLayers or GeoExt? Please check out > http://www.osgis.nl/support.html > > Bart van den Eijnden > OSGIS > [email protected] > > > <ATT00001..txt> _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
