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Re: [udig-devel] how to refresh a layer
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An alternate we could do is to guess the bounds based on the extent of
the CRS used; this would result in "extra" draw requests when nothing
is on the screen.
Thank you for explaining the issue.
jody
On Wed, Nov 11, 2009 at 12:03 PM, redstar <redstarfx@xxxxxxxxx> wrote:
> Thank you very much.
> I have solved the problem, and I'd like to share it.
>
> The problem is caused by bouds. I use gml datasource to render map. And in
> gml datasource, there are some code like:
>
> Envelope temp = new Envelope();
> CoordinateReferenceSystem
> crs=ft.getDefaultGeometry().getCoordinateSystem();
> FeatureIterator iter =
> source.getFeatures().features();
> try{
> while( iter.hasNext() ) {
> Feature element = iter.next();
> if( temp.isNull() )
> temp.init(element.getBounds());
> else
> temp.expandToInclude(element.getBounds());
> }
> }finally{
> iter.close();
> }
> bounds=new ReferencedEnvelope(temp,crs);
>
> So, if you don't set the bounds in GML, udig would calculate it for you. As
> a result, every layer have diffrent bounds and the layer which contains only
> one point have very small bounds. And then, when the point move, it will
> move out of the bounds quickly.
>
>
>
>
> 2009/11/10 Mauricio Pazos <mauricio.pazos@xxxxxxxx>
>>
>> On Monday 09 November 2009 07:31:57 am redstar wrote:
>> > I used these cod to refresh the layer:
>> >
>> > ILayer layer = LayerUtil.getLayerByName("GPS");
>> > layer.refresh(ApplicationGIS.getActiveMap().getBounds(null));
>> >
>> >
>> > However, I can see the point moved and moved out of a box bound(quite
>> > samll
>> > bound than map bound), and then disappeared.
>> We are using the following code to refresh the entire layer.
>>
>> ILayer target = ...
>> IMap map = ...
>> map.getRenderManager().refresh(target, map.getBounds(new
>> NullProgressMonitor()));
>>
>> Also, it could be interesting to have a look in MapImpl.getBounds method,
>> please pay attention in the following line
>> bbox = layer.getBounds(null, getViewportModel().getCRS())
>>
>>
>> cheers
>>
>>
>> --
>> Mauricio Pazos
>> www.axios.es
>>
>
>
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
>
>
