[udig-devel] ghost windows in map view with large shapefiles

[Markus Schaber]

Hi, Myron,

Myron Wu wrote:


> I have a client running RC1 who gets strange rendering problems (see
> attached screenshot) where other windows start ghosting atop the map
> view.  It seems to happen when they load fairly large shapefiles.
> I've tried to reproduce the effect on my own computer with no
> success, so I'd like to ask if anyone else's ever seen something
> similar?

Can you give us some more informations:

- It seems the client has a dual-core / dual-cpu / hyperthreading
machine - is your one equally equipped?

- Do you both have the same OS and Java version?

- Did you use the same large shapefiles for your local tests?

As the CPU usage seems to be 50% (of 2 cpus) in both cases, I think that
there's one thread using all CPU it gets, trying to render the
shapefile, and thus blocking the window updates.

I've seen screen update times of nearly a minute for complex shapefiles.


> (see attached screenshot)

A little (off-topic) remark:

Please don't send such large .bmp files to mailing lists, it was about
3MB large, which grew to 4 MB to the base64 encoding used in email.

Converting the image to .png format reduces its size to 100kb (factor
30), without any loss of quality.



Thanks,
Markus

-- 
Markus Schaber | Logical Tracking&Tracing International AG
Dipl. Inf.     | Software Development GIS

Fight against software patents in EU! www.ffii.org www.nosoftwarepatents.org

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