Thread: [Gwt-openlayers-users] WMS shifts to wrong location after zooming/panning

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gwt-openlayers-users

[Gwt-openlayers-users] WMS shifts to wrong location after zooming/panning

From: Wigger T. <but...@ho...> - 2011-03-03 22:30:38

Dear List,
In my web application using gwt-openlayers 0.5 and GWT 2.04 I am experiencing a rather annoying problem. When I initially load a WMS, it is visualized without a problem. When I zoom, however, the WMS is shifted, most of the time to the south east. After every pan/ zoom action the offset is difference. When I use firebug in firefox I see can see that the DIV that contains the image has a top and left offset as can be seen below:
<div style="overflow: hidden; position: absolute; z-index: 1; left: 218px; top: 96px; width: 1004px; height: 496px;"><img id="OpenLayersDiv499" style="width: 1004px; height: 496px; position: relative;" class="olTileImage" src="xxxxxx/deegree/services?FORMAT=image%2Fpng&amp;TRANSPARENT=TRUE&amp;LAYERS=Lakes%20Rwanda&amp;SERVICE=WMS&amp;VERSION=1.1.1&amp;REQUEST=GetMap&amp;STYLES=&amp;EXCEPTIONS=application%2Fvnd.ogc.se_inimage&amp;SRS=EPSG%3A900913&amp;_OLSALT=0.7358005342568256&amp;BBOX=3186029.3265993,-283703.63671876,3493000.4269411,-132052.57519532&amp;WIDTH=1004&amp;HEIGHT=496"></div>
The image that is returned by Deegree is fine by the way. 
Does anyone have an idea what is going wrong and what I can do to solve it? Thanks in advance!
Best,Willem

Re: [Gwt-openlayers-users] WMS shifts to wrong location after zooming/panning

From: Edwin C. <com...@gm...> - 2011-03-04 08:31:06

Are you using plain GWT or some GUI library?

It is OpenLayers that calculates these offsets for tiled layers.
Apparently it does this in way that does not play nice with GWT. Have
you tried untiled (get's the whole map image in one go, versus in
several tiles)? Or is that no option for you?

Greetings,
Edwin

On 3 March 2011 23:30, Wigger Tims <but...@ho...> wrote:
> Dear List,
> In my web application using gwt-openlayers 0.5 and GWT 2.04 I am
> experiencing a rather annoying problem. When I initially load a WMS, it is
> visualized without a problem. When I zoom, however, the WMS is shifted, most
> of the time to the south east. After every pan/ zoom action the offset is
> difference. When I use firebug in firefox I see can see that the DIV that
> contains the image has a top and left offset as can be seen below:
> <div style="overflow: hidden; position: absolute; z-index: 1; left: 218px;
> top: 96px; width: 1004px; height: 496px;"><img id="OpenLayersDiv499"
> style="width: 1004px; height: 496px; position: relative;"
> class="olTileImage"
> src="xxxxxx/deegree/services?FORMAT=image%2Fpng&amp;TRANSPARENT=TRUE&amp;LAYERS=Lakes%20Rwanda&amp;SERVICE=WMS&amp;VERSION=1.1.1&amp;REQUEST=GetMap&amp;STYLES=&amp;EXCEPTIONS=application%2Fvnd.ogc.se_inimage&amp;SRS=EPSG%3A900913&amp;_OLSALT=0.7358005342568256&amp;BBOX=3186029.3265993,-283703.63671876,3493000.4269411,-132052.57519532&amp;WIDTH=1004&amp;HEIGHT=496"></div>
> The image that is returned by Deegree is fine by the way.
> Does anyone have an idea what is going wrong and what I can do to solve it?
> Thanks in advance!
> Best,
> Willem
>
>
> ------------------------------------------------------------------------------
> What You Don't Know About Data Connectivity CAN Hurt You
> This paper provides an overview of data connectivity, details
> its effect on application quality, and explores various alternative
> solutions. http://p.sf.net/sfu/progress-d2d
> _______________________________________________
> Gwt-openlayers-users mailing list
> Gwt...@li...
> https://lists.sourceforge.net/lists/listinfo/gwt-openlayers-users
>
>

Re: [Gwt-openlayers-users] WMS shifts to wrong location after zooming/panning

From: Roland S. <Rol...@no...> - 2011-03-04 16:10:26

Hi,

On 03/04/2011 02:30 AM, Edwin Commandeur wrote:
> Are you using plain GWT or some GUI library?
>
> It is OpenLayers that calculates these offsets for tiled layers.
> Apparently it does this in way that does not play nice with GWT. Have
> you tried untiled (get's the whole map image in one go, versus in
> several tiles)? Or is that no option for you?

I have found that problems like this crop up when the div that contains 
the map moves on the page.  My solution was to connect a function that 
re-centers the map to events that cause the location of the map div to 
move on the page.  In our case we add and remove some selection elements 
above the div pushing it up and down on the page and re-centering the 
map each time one of those elements was added/removed fixed the problem.

Roland


  public void resizeMap() {
                 // Do a meaningless little calculation to force the map 
to re-calibrate where it is on the page.
                 int zoom = map.getZoom();
                 LonLat center = map.getCenter();
                 map.setCenter(center, zoom);
         }
> Greetings,
> Edwin
>
> On 3 March 2011 23:30, Wigger Tims<but...@ho...>  wrote:
>> Dear List,
>> In my web application using gwt-openlayers 0.5 and GWT 2.04 I am
>> experiencing a rather annoying problem. When I initially load a WMS, it is
>> visualized without a problem. When I zoom, however, the WMS is shifted, most
>> of the time to the south east. After every pan/ zoom action the offset is
>> difference. When I use firebug in firefox I see can see that the DIV that
>> contains the image has a top and left offset as can be seen below:
>> <div style="overflow: hidden; position: absolute; z-index: 1; left: 218px;
>> top: 96px; width: 1004px; height: 496px;"><img id="OpenLayersDiv499"
>> style="width: 1004px; height: 496px; position: relative;"
>> class="olTileImage"
>> src="xxxxxx/deegree/services?FORMAT=image%2Fpng&amp;TRANSPARENT=TRUE&amp;LAYERS=Lakes%20Rwanda&amp;SERVICE=WMS&amp;VERSION=1.1.1&amp;REQUEST=GetMap&amp;STYLES=&amp;EXCEPTIONS=application%2Fvnd.ogc.se_inimage&amp;SRS=EPSG%3A900913&amp;_OLSALT=0.7358005342568256&amp;BBOX=3186029.3265993,-283703.63671876,3493000.4269411,-132052.57519532&amp;WIDTH=1004&amp;HEIGHT=496"></div>
>> The image that is returned by Deegree is fine by the way.
>> Does anyone have an idea what is going wrong and what I can do to solve it?
>> Thanks in advance!
>> Best,
>> Willem
>>
>>
>> ------------------------------------------------------------------------------
>> What You Don't Know About Data Connectivity CAN Hurt You
>> This paper provides an overview of data connectivity, details
>> its effect on application quality, and explores various alternative
>> solutions. http://p.sf.net/sfu/progress-d2d
>> _______________________________________________
>> Gwt-openlayers-users mailing list
>> Gwt...@li...
>> https://lists.sourceforge.net/lists/listinfo/gwt-openlayers-users
>>
>>
> ------------------------------------------------------------------------------
> What You Don't Know About Data Connectivity CAN Hurt You
> This paper provides an overview of data connectivity, details
> its effect on application quality, and explores various alternative
> solutions. http://p.sf.net/sfu/progress-d2d
> _______________________________________________
> Gwt-openlayers-users mailing list
> Gwt...@li...
> https://lists.sourceforge.net/lists/listinfo/gwt-openlayers-users

Re: [Gwt-openlayers-users] WMS shifts to wrong location after zooming/panning

From: Wigger T. <but...@ho...> - 2011-03-06 21:08:18

Dear all,
Thank you for your help. unfortunately I haven't solved the problem yet. 
- My layout is the following: I have a dockpanel as root, and add an Absolute panel (containing the mapwidget) to the center of the Dockpanel.- I have tried both tiled and single tile layers. No real difference in result. Besides GWT I use smartgwt and incubator libraries. I used them before in other projects where they didn't seem to cause any problems. - In my map I dont believe other divs, like the selection element you mentioned, could cause the WMS div to move. 
Could it help if I send you the link to the application in a private email so you can see what happends? It seems that if I pan the WMS to the top left corner it fits again on the underground (OSM). 
Thanks again,Willem 

> Date: Fri, 4 Mar 2011 09:09:59 -0600
> From: Rol...@no...
> To: gwt...@li...
> Subject: Re: [Gwt-openlayers-users] WMS shifts to wrong location	after	zooming/panning
> 
> Hi,
> 
> On 03/04/2011 02:30 AM, Edwin Commandeur wrote:
> > Are you using plain GWT or some GUI library?
> >
> > It is OpenLayers that calculates these offsets for tiled layers.
> > Apparently it does this in way that does not play nice with GWT. Have
> > you tried untiled (get's the whole map image in one go, versus in
> > several tiles)? Or is that no option for you?
> 
> I have found that problems like this crop up when the div that contains 
> the map moves on the page.  My solution was to connect a function that 
> re-centers the map to events that cause the location of the map div to 
> move on the page.  In our case we add and remove some selection elements 
> above the div pushing it up and down on the page and re-centering the 
> map each time one of those elements was added/removed fixed the problem.
> 
> Roland
> 
> 
>   public void resizeMap() {
>                  // Do a meaningless little calculation to force the map 
> to re-calibrate where it is on the page.
>                  int zoom = map.getZoom();
>                  LonLat center = map.getCenter();
>                  map.setCenter(center, zoom);
>          }
> > Greetings,
> > Edwin
> >
> > On 3 March 2011 23:30, Wigger Tims<but...@ho...>  wrote:
> >> Dear List,
> >> In my web application using gwt-openlayers 0.5 and GWT 2.04 I am
> >> experiencing a rather annoying problem. When I initially load a WMS, it is
> >> visualized without a problem. When I zoom, however, the WMS is shifted, most
> >> of the time to the south east. After every pan/ zoom action the offset is
> >> difference. When I use firebug in firefox I see can see that the DIV that
> >> contains the image has a top and left offset as can be seen below:
> >> <div style="overflow: hidden; position: absolute; z-index: 1; left: 218px;
> >> top: 96px; width: 1004px; height: 496px;"><img id="OpenLayersDiv499"
> >> style="width: 1004px; height: 496px; position: relative;"
> >> class="olTileImage"
> >> src="xxxxxx/deegree/services?FORMAT=image%2Fpng&amp;TRANSPARENT=TRUE&amp;LAYERS=Lakes%20Rwanda&amp;SERVICE=WMS&amp;VERSION=1.1.1&amp;REQUEST=GetMap&amp;STYLES=&amp;EXCEPTIONS=application%2Fvnd.ogc.se_inimage&amp;SRS=EPSG%3A900913&amp;_OLSALT=0.7358005342568256&amp;BBOX=3186029.3265993,-283703.63671876,3493000.4269411,-132052.57519532&amp;WIDTH=1004&amp;HEIGHT=496"></div>
> >> The image that is returned by Deegree is fine by the way.
> >> Does anyone have an idea what is going wrong and what I can do to solve it?
> >> Thanks in advance!
> >> Best,
> >> Willem
> >>
> >>
> >> ------------------------------------------------------------------------------
> >> What You Don't Know About Data Connectivity CAN Hurt You
> >> This paper provides an overview of data connectivity, details
> >> its effect on application quality, and explores various alternative
> >> solutions. http://p.sf.net/sfu/progress-d2d
> >> _______________________________________________
> >> Gwt-openlayers-users mailing list
> >> Gwt...@li...
> >> https://lists.sourceforge.net/lists/listinfo/gwt-openlayers-users
> >>
> >>
> > ------------------------------------------------------------------------------
> > What You Don't Know About Data Connectivity CAN Hurt You
> > This paper provides an overview of data connectivity, details
> > its effect on application quality, and explores various alternative
> > solutions. http://p.sf.net/sfu/progress-d2d
> > _______________________________________________
> > Gwt-openlayers-users mailing list
> > Gwt...@li...
> > https://lists.sourceforge.net/lists/listinfo/gwt-openlayers-users
> 
> 
> ------------------------------------------------------------------------------
> What You Don't Know About Data Connectivity CAN Hurt You
> This paper provides an overview of data connectivity, details
> its effect on application quality, and explores various alternative
> solutions. http://p.sf.net/sfu/progress-d2d
> _______________________________________________
> Gwt-openlayers-users mailing list
> Gwt...@li...
> https://lists.sourceforge.net/lists/listinfo/gwt-openlayers-users