Hi Bart,<br><br>yes, I've set these options. I noticed that these multiple requests only happen when I set transitionEffect: 'resize'. <br><br>I'm using OpenLayers 2.9.1.<br><br>Franz<br><br><br><br><div class="gmail_quote">
2010/8/3 Bart van den Eijnden (OSGIS) <span dir="ltr"><<a href="mailto:bartvde@osgis.nl" target="_blank">bartvde@osgis.nl</a>></span><br>
<blockquote class="gmail_quote" style="margin: 0pt 0pt 0pt 0.8ex; border-left: 1px solid rgb(204, 204, 204); padding-left: 1ex;">
Hi Franz,<br>
<br>
and have you verified you only have a single tile?<br>
<br>
Do you have singleTile: true, ratio: 1 and buffer: 0 in your layer options?<br>
<div><div></div><div><br>
Best regards,<br>
Bart<br>
<br>
> Hi Bart,<br>
><br>
> I'm almost done with my layer implementation. The only problem: my<br>
> getURLasync() Method gets triggered far too often (about 3x per pan/zoom<br>
> action).<br>
><br>
> How can I make sure that getURLasync is only triggered once per map<br>
> action?<br>
><br>
> Franz<br>
><br>
> 2010/8/3 Bart van den Eijnden (OSGIS) <<a href="mailto:bartvde@osgis.nl" target="_blank">bartvde@osgis.nl</a>><br>
><br>
>> Hi Franz,<br>
>><br>
>> check out OpenLayers.Tile.Image.<br>
>><br>
>> Best regards,<br>
>> Bart<br>
>><br>
>> > Hi Bart,<br>
>> ><br>
>> > thanks for the fast and helpful response!<br>
>> ><br>
>> > One question though: which class actually invokes the methods<br>
>> > OpenLayers.Layer.ArcIMS.getUrl and OpenLayers.Layer.getUrlAsync?<br>
>> ><br>
>> > They seem to be overriden methods, but i couldn't find them in<br>
>> > OpenLayers.Layer.Grid or OpenLayers.Layer.HTTPRequest.<br>
>> ><br>
>> > kind regards,<br>
>> ><br>
>> > Franz<br>
>> ><br>
>> > 2010/8/3 Bart van den Eijnden (OSGIS) <<a href="mailto:bartvde@osgis.nl" target="_blank">bartvde@osgis.nl</a>><br>
>> ><br>
>> >> Hi,<br>
>> >><br>
>> >> I would advise you to look at OpenLayers.Layer.ArcIMS which uses a<br>
>> >> similar<br>
>> >> approach.<br>
>> >><br>
>> >> Best regards,<br>
>> >> Bart<br>
>> >><br>
>> >> > Hi,<br>
>> >> ><br>
>> >> > I'm a frontend developer and was programming a web viewer for a<br>
>> >> > proprietary,<br>
>> >> > WMS-like map service.<br>
>> >> > I discovered Openlayers one month ago and I'm really fascinated by<br>
>> its<br>
>> >> > awesome capabilities, so I decided to integrate our map service in<br>
>> >> > OpenLayers.<br>
>> >> ><br>
>> >> > Here is a short description how the map service works:<br>
>> >> ><br>
>> >> > The client sends an AJAX request containing the current map bounds,<br>
>> >> the<br>
>> >> > map<br>
>> >> > id and the pixel size of the map.<br>
>> >> ><br>
>> >><br>
>> map=22&px=1720&py=833&left=2504400&right=2544000&top=5699500&bottom=5669500&type=0<br>
>> >> ><br>
>> >> > The server responds with the generated map image (url) and the<br>
>> >> corrected<br>
>> >> > bounds:<br>
>> >> > <MapProperties><br>
>> >> > <mapLeft>2493227.6110444176</mapLeft><br>
>> >> > <mapTop>5699500</mapTop><br>
>> >> > <mapRight>2555172.3889555824</mapRight><br>
>> >> > <mapBottom>5669500</mapBottom><br>
>> >> > <mapType>0</mapType><br>
>> >> > <overviewMap>22</overviewMap><br>
>> >> > <url><br>
>> >> <a href="http://localhost/cgmCache/41600065-c3d2-4934-9feb-78a32f6668c8.png" target="_blank">http://localhost/cgmCache/41600065-c3d2-4934-9feb-78a32f6668c8.png</a><br>
>> >> > </url><br>
>> >> > </MapProperties><br>
>> >> ><br>
>> >> > The maps are always single-tiled.<br>
>> >> ><br>
>> >> > My first approach was to write a ProprietaryMapLayer, that executes<br>
>> >> the<br>
>> >> > map<br>
>> >> > request and creates an ImageLayer with the result url and its<br>
>> bounds.<br>
>> >> > When the ImageLayer is moved, a new request is performed, the<br>
>> current<br>
>> >> > ImageLayer is destroyed and a new one generated. The disadvantage:<br>
>> >> there<br>
>> >> > are<br>
>> >> > now 2 layers representing one map, which leads to confusion in the<br>
>> >> layer<br>
>> >> > switcher control.<br>
>> >> ><br>
>> >> > I read over the code of Layer.WMS, which inherits from Layer.Grid<br>
>> and<br>
>> >> also<br>
>> >> > makes use of Tile.Image, but it's difficult to derive a solution<br>
>> from<br>
>> >> it,<br>
>> >> > since all the request/response handling is already integrated into<br>
>> the<br>
>> >> > layer. Furthermore, WMS simply responds with tile images, whereas I<br>
>> >> have<br>
>> >> > to<br>
>> >> > deal with an xml response.<br>
>> >> ><br>
>> >> > Any ideas how I could implement my layer?<br>
>> >> ><br>
>> >> > kind regards,<br>
>> >> ><br>
>> >> > Franz<br>
>> >> > _______________________________________________<br>
>> >> > Users mailing list<br>
>> >> > <a href="mailto:Users@openlayers.org" target="_blank">Users@openlayers.org</a><br>
>> >> > <a href="http://openlayers.org/mailman/listinfo/users" target="_blank">http://openlayers.org/mailman/listinfo/users</a><br>
>> >> ><br>
>> >><br>
>> >><br>
>> >> --<br>
>> >> Looking for flexible support on OpenLayers or GeoExt? Please check<br>
>> out<br>
>> >> <a href="http://www.osgis.nl/support.html" target="_blank">http://www.osgis.nl/support.html</a><br>
>> >><br>
>> >> Bart van den Eijnden<br>
>> >> OSGIS<br>
>> >> <a href="mailto:bartvde@osgis.nl" target="_blank">bartvde@osgis.nl</a><br>
>> >><br>
>> >><br>
>> ><br>
>><br>
>><br>
>> --<br>
>> Looking for flexible support on OpenLayers or GeoExt? Please check out<br>
>> <a href="http://www.osgis.nl/support.html" target="_blank">http://www.osgis.nl/support.html</a><br>
>><br>
>> Bart van den Eijnden<br>
>> OSGIS<br>
>> <a href="mailto:bartvde@osgis.nl" target="_blank">bartvde@osgis.nl</a><br>
>><br>
>><br>
><br>
<br>
<br>
</div></div>--<br>
<div><div></div><div>Looking for flexible support on OpenLayers or GeoExt? Please check out<br>
<a href="http://www.osgis.nl/support.html" target="_blank">http://www.osgis.nl/support.html</a><br>
<br>
Bart van den Eijnden<br>
OSGIS<br>
<a href="mailto:bartvde@osgis.nl" target="_blank">bartvde@osgis.nl</a><br>
<br>
</div></div></blockquote></div><br>