[OpenLayers-Users] Panning map and bbox/tile position bug?
Gissur Þórhallsson
gissur at loftmyndir.is
Fri Jan 16 09:36:49 EST 2009
Hi Ian,
Nice bug coaching on your end, and yes I can verify that I am experiencing
similar behavior, though I'm still not sure it's not something in my own
config. I also discovered it while perusing the wiki printing code, and
actually just posted a question to a thread discussing it before noticing
your message.
Were you able to fix the problem or find a work-around?
Kind regards,
Gissur
On Mon, Nov 3, 2008 at 7:28 PM, Ian <iansgis at gmail.com> wrote:
> The bounding box and extent of the viewport seems to be corrupted when
> panning the map. The actual display of the data is fine, however the
> underlying bbox and x/y values for tiles corrupt printed images when using
> the Wiki Printing code. While panning the map and then printing will give an
> incorrect image result, switching the base layer after panning fixes the
> bbox and x/y values and any base layer will print correctly thereafter.
> Additional panning does require additional base layer switches to fix the
> extent again.
>
> Test map:
>
> function loadMap(){
> map = new OpenLayers.Map( 'map' );
> var lon = -119.2;
> var lat = 37;
> var zoom = 4;
> var lyrSw = new OpenLayers.Control.LayerSwitcher();
> map.addControl(lyrSw);
> var ol_wms = new OpenLayers.Layer.WMS("basic","
> http://labs.metacarta.com/wms/vmap0",{layers: 'basic'});
> var satellite = new OpenLayers.Layer.WMS("sat", "
> http://hypercube.telascience.org/cgi-bin/landsat7?", {layers:'landsat7'},
> {format: 'image/jpeg', wrapDateLine: false});
>
> map.addLayers([ol_wms,satellite]);
> map.setCenter(new OpenLayers.LonLat(lon,lat),zoom);
> }
>
>
> To reproduce this behavior:
> 1. Print the initial map (works correctly)
> 2. Pan the map and print (incorrect map extent with vertical black band on
> left side of image)
> 3. Switch the base layer and print (works correctly)
> 4. Switch back to initial base layer and print (now works correctly)
>
> Following are debugging excerpts of each tile's url and x/y positions from
> printMap.php:
>
> Pan the map and print:
>
>
> http://url?LAYERS=basic&BBOX=-123.75,50.625,-118.125,56.25&WIDTH=256&HEIGHT=256,
> x: 43, y: -626
>
> http://url?LAYERS=basic&BBOX=-118.125,50.625,-112.5,56.25&WIDTH=256&HEIGHT=256,
> x: 299, y: -626
>
> http://url?LAYERS=basic&BBOX=-112.5,50.625,-106.875,56.25&WIDTH=256&HEIGHT=256,
> x: 555, y: -626
>
> http://url?LAYERS=basic&BBOX=-106.875,50.625,-101.25,56.25&WIDTH=256&HEIGHT=256,
> x: 811, y: -626
>
> http://url?LAYERS=basic&BBOX=-101.25,50.625,-95.625,56.25&WIDTH=256&HEIGHT=256,
> x: 1067, y: -626
> http://url?LAYERS=basic&BBOX=-95.625,50.625,-90,56.25&WIDTH=256&HEIGHT=256,
> x: 1323, y: -626
> http://url?LAYERS=basic&BBOX=-90,50.625,-84.375,56.25&WIDTH=256&HEIGHT=256,
> x: 1579, y: -626
>
> http://url?LAYERS=basic&BBOX=-123.75,45,-118.125,50.625&WIDTH=256&HEIGHT=256,
> x: 43, y: -370
> http://url?LAYERS=basic&BBOX=-118.125,45,-112.5,50.625&WIDTH=256&HEIGHT=256,
> x: 299, y: -370
> http://url?LAYERS=basic&BBOX=-112.5,45,-106.875,50.625&WIDTH=256&HEIGHT=256,
> x: 555, y: -370
>
> http://url?LAYERS=basic&BBOX=-106.875,45,-101.25,50.625&WIDTH=256&HEIGHT=256,
> x: 811, y: -370
> http://url?LAYERS=basic&BBOX=-101.25,45,-95.625,50.625&WIDTH=256&HEIGHT=256,
> x: 1067, y: -370
> http://url?LAYERS=basic&BBOX=-95.625,45,-90,50.625&WIDTH=256&HEIGHT=256,
> x: 1323, y: -370
> http://url?LAYERS=basic&BBOX=-90,45,-84.375,50.625&WIDTH=256&HEIGHT=256,
> x: 1579, y: -370
>
> Switch base layer to sat and print:
>
>
> http://url?LAYERS=sat&BBOX=-129.375,56.25,-123.75,61.875&WIDTH=256&HEIGHT=256,
> x: -652, y: -762
>
> http://url?LAYERS=sat&BBOX=-123.75,56.25,-118.125,61.875&WIDTH=256&HEIGHT=256,
> x: -396, y: -762
>
> http://url?LAYERS=sat&BBOX=-118.125,56.25,-112.5,61.875&WIDTH=256&HEIGHT=256,
> x: -140, y: -762
>
> http://url?LAYERS=sat&BBOX=-112.5,56.25,-106.875,61.875&WIDTH=256&HEIGHT=256,
> x: 116, y: -762
>
> http://url?LAYERS=sat&BBOX=-106.875,56.25,-101.25,61.875&WIDTH=256&HEIGHT=256,
> x: 372, y: -762
>
> http://url?LAYERS=sat&BBOX=-101.25,56.25,-95.625,61.875&WIDTH=256&HEIGHT=256,
> x: 628, y: -762
> http://url?LAYERS=sat&BBOX=-95.625,56.25,-90,61.875&WIDTH=256&HEIGHT=256,
> x: 884, y: -762
>
> http://url?LAYERS=sat&BOX=-129.375,50.625,-123.75,56.25&WIDTH=256&HEIGHT=256,
> x: -652, y: -506
>
> http://url?LAYERS=sat&BBOX=-123.75,50.625,-118.125,56.25&WIDTH=256&HEIGHT=256,
> x: -396, y: -506
>
> http://url?LAYERS=sat&BBOX=-118.125,50.625,-112.5,56.25&WIDTH=256&HEIGHT=256,
> x: -140, y: -506
>
> http://url?LAYERS=sat&BBOX=-112.5,50.625,-106.875,56.25&WIDTH=256&HEIGHT=256,
> x: 116, y: -506
>
> http://url?LAYERS=sat&BBOX=-106.875,50.625,-101.25,56.25&WIDTH=256&HEIGHT=256,
> x: 372, y: -506
>
> http://url?LAYERS=sat&BBOX=-101.25,50.625,-95.625,56.25&WIDTH=256&HEIGHT=256,
> x: 628, y: -506
> http://url?LAYERS=sat&BBOX=-95.625,50.625,-90,56.25&WIDTH=256&HEIGHT=256,
> x: 884, y: -506
>
> Switch base layer back to basic and print:
>
>
> http://url?LAYERS=basic&BBOX=-129.375,56.25,-123.75,61.875&WIDTH=256&HEIGHT=256,
> x: -652, y: -762
>
> http://url?LAYERS=basic&BBOX=-123.75,56.25,-118.125,61.875&WIDTH=256&HEIGHT=256,
> x: -396, y: -762
>
> http://url?LAYERS=basic&BBOX=-118.125,56.25,-112.5,61.875&WIDTH=256&HEIGHT=256,
> x: -140, y: -762
>
> http://url?LAYERS=basic&BBOX=-112.5,56.25,-106.875,61.875&WIDTH=256&HEIGHT=256,
> x: 116, y: -762
>
> http://url?LAYERS=basic&BBOX=-106.875,56.25,-101.25,61.875&WIDTH=256&HEIGHT=256,
> x: 372, y: -762
>
> http://url?LAYERS=basic&BBOX=-101.25,56.25,-95.625,61.875&WIDTH=256&HEIGHT=256,
> x: 628, y: -762
> http://url?LAYERS=basic&BBOX=-95.625,56.25,-90,61.875&WIDTH=256&HEIGHT=256,
> x: 884, y: -762
>
> http://url?LAYERS=basic&BBOX=-129.375,50.625,-123.75,56.25&WIDTH=256&HEIGHT=256,
> x: -652, y: -506
>
> http://url?LAYERS=basic&BBOX=-123.75,50.625,-118.125,56.25&WIDTH=256&HEIGHT=256,
> x: -396, y: -506
>
> http://url?LAYERS=basic&BBOX=-118.125,50.625,-112.5,56.25&WIDTH=256&HEIGHT=256,
> x: -140, y: -506
>
> http://url?LAYERS=basic&BBOX=-112.5,50.625,-106.875,56.25&WIDTH=256&HEIGHT=256,
> x: 116, y: -506
>
> http://url?LAYERS=basic&BBOX=-106.875,50.625,-101.25,56.25&WIDTH=256&HEIGHT=256,
> x: 372, y: -506
>
> http://url?LAYERS=basic&BBOX=-101.25,50.625,-95.625,56.25&WIDTH=256&HEIGHT=256,
> x: 628, y: -506
> http://url?LAYERS=basic&BBOX=-95.625,50.625,-90,56.25&WIDTH=256&HEIGHT=256,
> x: 884, y: -506
>
> I also noted that layer.getTilesBounds() gives different bounds for a layer
> before/after "fixing" it via a base layer switch. If someone will confirm
> that this is a bug and not the result of a glaring omission on my part, I
> will file it. A quick look through known bugs didn't find anything along
> these lines.
>
> _______________________________________________
> Users mailing list
> Users at openlayers.org
> http://openlayers.org/mailman/listinfo/users
>
>
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://lists.osgeo.org/pipermail/openlayers-users/attachments/20090116/9b16fa14/attachment.html
More information about the Users
mailing list