Thanks for Your replay.
It sheds some light on reasons why it is done in such a way.
Peter
W dniu 2013-02-06 23:36, Jody Garnett pisze:
We do not as a rule cache any features - in part so we can work with
massive content.
As a framework we want to be as light on resources as possible, and
leave it up to applications that use uDig to choose when (and what) to
cache.
There is a cache checkbox in the style editor you can tick as an
experimental option, it keeps the features in a spatial index (and
pull features in as needed as your scroll around. It is very effective
when working with things like WFS.
The second question is a bit more interesting, wanting features in
world coordinates.
If you want to do that make a request of the feature source and fill
in the viewport CRS in the Query object. The features will be
reprojected as they come out of the database or shapefile. Indeed in
some cases the data sources supports native reproduction allowing us
to do less work in uDig.
Note that the features that are drawn on screen are subject to
"decimation" by the rendering engine, we throw out coordinates on the
fly, based on the math transform constructed between the original
data, the world CRS and the affine transformation to the screen. The
earlier we can throw out coordinates the less information involved in
drawing, and the faster we can update the screen.
Jody
On Wed, Feb 6, 2013 at 10:33 PM, Piotr Zduńczyk <[email protected]
<mailto:[email protected]>> wrote:
Hi,
Is any possibility in uDig to get all features rendered on map?
Is there any cache or something like that?
I was previously collect features in BasicFeatureRenderer by
caching features in BasicRenderListener but from uDig 1.3 features
have coordinates recalculated from work to pixel, and I want
features with word coordinates..
Any ideas how to do that?
Thanks,
Peter
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