Andrea Aime wrote:
Jody Garnett ha scritto:
Fun stuff Andrea - I notice one of the SoC students has a data caching
project in mind. Did you want to put this code in an unsupported module?
Yeah, I know, already spoke with Ian T. about the SoC.
About a module, no, I did not, and do not plan to for the moment (it's
just a single class).
Want to hear back from users before deciding on eventually supporting
this thing.
Cheers
Andrea
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Andrea and Jody,
Thank you for making time to review the FeatureSource module. I have
been utilizing the GeoTools modules for the purpose of creating an
interactive desktop gis application. Overall, I am very impressed with
the work that has been done and I am looking forward to being more
involved with the geotools project.
The database objects (dbtt\vt) that are used for our application have
been developed by Mike Quinn of the Merced County Ag Dept, I have
implemented a custom DataStore, FeatureSource, FeatureCollection,
FeatureReader, AttributeReader, and FeatureType to work with them.
For the FeatureSource module, I chose to store the features in a
FeatureCollection object that is populated the first time that the
FeatureSource.getFeatures(Query request) method is invoked.
This morning, I replaced the instances of vtFeatureSource with
ChachingFeatureSource to evaluate the change in rendering speed. To
test the differences between the modules, I drew a map at full extent.
I then changed the extent to a specific grid(1mile square) then zoomed
out by 25% several times. I used System.currentTimeMilis() to determine
the time required for the GTRenderer to paint the Graphics2D object.
The results of the test are attached as a csv file to this message.
I have developed a custom MapPane (vtMapPane) that was derived from the
JMapPane object and has been tailored to work with the dbtt\vt database
objects; I have added features for editing existing polygons and drawing
new ones. In my attempt to tailor the Datastore objects to work with
the (dbtt\vt) database objects, I need to ensure that I have not made
the rendering process slower. Rendering a map on the screen takes more
time than I would like, thus I have experimented with and changed the
paint method. As well, the Datastore objects need to be evaluated to
ensure that they have not resulted in a sluggish renderer. After that
has been determined, I will be investing time into reviewing other areas
where the rendering process can be improved.
Once again thanks to all who have contributed to the GeoTools project :-)
Best Regards,
Pat
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