Interesting results. However, on a hunch, I did a test with even more
interesting results. On Windows, open Task Manager and watch the CPU Usage
while OJ renders a large dataset. After the rendering is visually complete,
OJ continues to use CPU cycles for much longer - almost a minute in my
test. After the CPU Usage finally drops, selection feedback starts
working.
This is might be an indication that multiple redundant layer redraws are
occurring. Since selection feedback is drawn last, it must wait for all of
this to finish. I don't have any ideas as to what might be causing this,
does anyone else?
regards,
Larry
On Fri, Feb 19, 2010 at 11:40 AM, Stefan Steiniger <sst...@geo.uzh.ch>wrote:
> mhm.. ok, so I would guess the problem is related to the size of the
> geometries and its drawing?
> I recently had a problem - drawing a linestring that consisted of more
> than 1000 points. I couldn't do anything for 20-30 seconds on MS Vista,
> my XP was a bit faster. However, the problem solved when I connected the
> 1000 points with linestrings that have only a start and endpoint, i.e.
> instead of drawing 1 linestring a had to draw now 500, but here the 500
> lines could be drawn one after each other, and everything is done within
> 2-3 seconds (instead of 20 secs)
>
> (if Larry wants to test, I can send that linestring?)
>
> however, I am not sure why working with the 1000 points linestring is so
> slow (i.e. does paint make some tests?)
>
> stefan
>
> luca marletta wrote:
> > luca marletta
> > www.beopen.it
> >
> >
> >
> > On Fri, Feb 19, 2010 at 5:42 PM, Larry Becker <becker.la...@gmail.com>
> wrote:
> >> Hi luca,
> >>
> >> When you try to select features, does the status bar quickly show your
> >> selection count, even though no selection handles appear?
> >>
> >> If not, this explains why the right click menu is not appearing. It
> needs
> >> selection information to enable or disable options.
> >
> > Larry, no I had not much problem with showing selection count, is anyway
> quick.
> >
> > I noticed an important stuff.
> >
> > May dataset is full of large and aggregated geometry and in this case
> > I guess geometry index can not much help.
> >
> > If I explode all, I reduce the delay a lot.
> >
> > luca
> >
> >
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--
Larry Becker
Integrated Systems Analysts, Inc.
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