ty for reply ;
I've developed using my structure ;
MapGraphic {
FeatureCollection (geotools) ;
MapContent ( geotools );
StreaminRenderer (geotols);
draw(context){
render graphic using streamingRenderer;
}
onDataChange(){
updateFeatureCollection;
context.getLayer.refresh;
}
its working really fast. ty for advice.
On Jul 5, 2012, at 5:04 PM, Jody Garnett wrote:
> MapGraphic is intended for really fast feedback (i.e. no disk IO) - so
> rendering from an in memory feature collection could be done! You can steal
> the technique from BasicFeatureRenderer if you like …
>
> In the past, for tracking moving objects we have had good luck with one
> thread filling in a data structure; and a map graphic drawing out of the data
> structure using a timer (as with some of the animation examples). There is
> also a glass layer you can place overtop of your map for more direct SWT
> rendering.
>
> Note you can render a Memory based FeatureSource - there is no reason the
> transaction code needs to involve writes to disk. GeoTools has several
> implementations now (the original based on a Tree which sorts the features by
> featureId, a list based one allowing you to wrap your own list up as a
> feature collection, and a spatial index solution used for drawing
> performance).
> --
> Jody Garnett
>
> On Wednesday, 4 July 2012 at 9:53 PM, omur yavuz wrote:
>
>> Hi ,
>>
>> i ve a question about mapgraphic rendering. map has a polygon layer named
>> "A". some of attributes of layer changes dynamically in another thread.
>> The easiest way to update "A" FeatureStrore every time attributes changes
>> and re-render layer , but i don't want to use this method because of
>> transaction management , disk writes vs. so I'm planning to create a
>> FeatureCollection in memory and mapping it to a MapGraphic layer.
>> how can i render FeatureCollection inside MapGraphic draw method . should i
>> use MapGraphicContext RenderManager to create a renderer (and how) ? , or
>> simply create a StreamingRenderer and empty Geotools MapContext inside
>> MapGraphic ?
>>
>> Thanks For Help,
>>
>>
>> _______________________________________________
>> User-friendly Desktop Internet GIS (uDig)
>> http://udig.refractions.net
>> http://lists.refractions.net/mailman/listinfo/udig-devel
>
> _______________________________________________
> User-friendly Desktop Internet GIS (uDig)
> http://udig.refractions.net
> http://lists.refractions.net/mailman/listinfo/udig-devel
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