I implement selection tool and to have better performance I cached
features rendered on map ( because only this can be selected by user) .
This functionality is also used with snapping it is faster to filter on
features in cache than looking into database especially when multilayer
snapping is on.
Peter
W dniu 2013-02-08 03:39, Jody Garnett pisze:
Can I ask what you are trying to accomplish with a list of features
already on the map? Perhaps there is another way to accomplish what
you are after?
--
Jody Garnett
On Thursday, 7 February 2013 at 8:06 PM, Piotr Zduńczyk wrote:
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
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
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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
--
*Piotr Zduńczyk*
Inżynier Oprogramowania
Globema Sp. z o.o.
ul. Wita Stwosza 22
02-661 Warszawa
tel. (+48) 22 848 73 13 wew. 313
fax (+48) 22 848 68 83
www.globema.com/pl/ <http://www.globema.com/pl/>
"Treść tej wiadomości może zawierać prawnie chronione informacje
poufne. Jeśli otrzymaliście ją Państwo przez pomyłkę, prosimy o
niezwłoczne powiadomienie o tym nadawcy oraz jej usunięcie z Państwa
komputera, bez wykonywania dystrybuowania lub zatrzymywania
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This message may contain confidential information protected by law.
If you have received this message by mistake, please immediately
inform the sender of the mistake and delete this message from your
system without making, distributing or retaining any copies of it."
_______________________________________________
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
--
*Piotr Zduńczyk*
Inżynier Oprogramowania
Globema Sp. z o.o.
ul. Wita Stwosza 22
02-661 Warszawa
tel. (+48) 22 848 73 13 wew. 313
fax (+48) 22 848 68 83
www.globema.com/pl/
"Treść tej wiadomości może zawierać prawnie chronione informacje poufne.
Jeśli otrzymaliście ją Państwo przez pomyłkę, prosimy o niezwłoczne
powiadomienie o tym nadawcy oraz jej usunięcie z Państwa komputera, bez
wykonywania dystrybuowania lub zatrzymywania jakiejkolwiek jej kopii.
This message may contain confidential information protected by law. If
you have received this message by mistake, please immediately inform the
sender of the mistake and delete this message from your system without
making, distributing or retaining any copies of it."
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
