Jody, Thanks for the quick response. Never heard of the sld cache
feature before.
Since net.refractions.udig.style.cache.CacheContent is programatically
not accessible from outside I just added
layer.getStyleBlackboard().put("net.refractions.udig.style.cache", true
); to my code. It works.
But I wonder why the map is drawn twice during an update: first time
without the layer (but all other layers) and then immediately after the
map including this layer is drawn. As a result the map flickers with
each update.
There are designs to take this further if needed; create your own custom
renderer (not the geotools one) and convert the geometry to java 2d
shapes for the current screen position and resolution (you can use the
utility classes in GeoTools for this part). Your map graphic can then
animate just the shapes; and not the full on feature and geometry
implementation.
Ok, I already thought thought about map graphics but then I have to care
for all the zoom and pan actions.
Which utility classes in GeoTools?
Let me know how the cache button works for you; if not I would be
willing to work on the RFC page with you can collaborate on the design
if the result was contributed back to uDig.
Ok, I'll test it a bit more and then I'll let you know.
Thanks again!
Matthias
--
Jody Garnett
[1] http://udig.refractions.net/confluence/display/EN/Feature+Style+Pages
On Tuesday, 6 September 2011 at 8:30 PM, Matthias Lendholt wrote:
Hi all
In our tsunami early warning system
(http://udig.refractions.net/gallery/dews/) we are using wave
propagation models. See attached image: A shapefile is providing the
isochrones. A dynamically generated sld provides the color gradient
which is based on an attribute containing the arrival time. The thick
red isochrone is updated in real-time showing the current position.
Depending on our models the update interval is between 12seconds and 2
minutes and rendering was not an issue.
As a new feature we would like to provide play back / fast forward
functionality to visualize the wave propagation. This means the
highlighted iso chrone will move quite fast, and the map has to be
updated every second. I tried it with the existing code but the
rendering gets stalled.
Currently on each update the sld is updated:
layer.getStyleBlackboard().put(SLDContent.ID, style);
layer.refresh(null);
I'm not sure whether this is the best way to update the styling.
The shapefile contains about 4300 Linestring features. Maybe this is to
heavy for animation-like map updates?
Many thanks in advance for any hints or suggestions.
Matthias
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Attachments:
- isochrones.jpg
_______________________________________________
User-friendly Desktop Internet GIS (uDig)
http://udig.refractions.net
http://lists.refractions.net/mailman/listinfo/udig-devel
--
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