OJ is optimized to only draw items that intersect the viewport.
Unfortunately, it takes work to determine which are which.
Larry
On Fri, Feb 19, 2010 at 3:09 PM, Sunburned Surveyor <
sunburned.surve...@gmail.com> wrote:
> Michael wrote: "It seems that selection rendering do not limit the
> rendering to the
> viewport (for high zoom
> rendering is slow, and periods where features are drawn on screen
> alternate with periods where nothing happen)"
>
> Does this mean we could speed things up by only painting the selected
> features within the viewport window? If we think this would help I can
> take a peek at the code.
>
> Landon
>
> 2010/2/19 Michaël Michaud <michael.mich...@free.fr>:
> > Hi,
> >
> > I can't help much as I did not notice any problem with selection and
> > zoom features.
> > I have a little regret about the delay after zooming as the zoom is very
> > fast but I have to wait a little 0.7s to see the new vector drawing.
> >
> > About selection and zoom / unzoom with a huge dataset, here are my
> figures
> > intel core i7 / 64 bits windows vista but used with a 32 bit version of
> java
> >
> > dataset : 177 545 features, 31 901 665 points
> > selection : 43217 features, 4 850 086 points (max = 57 398 points for
> > one feature)
> >
> > redraw for
> >
> > very low zoom : 14 s + 6 s for selection
> > low zoom : 8 s + 27 s for selection
> > medium zoom : 8 s + 35 s for selection
> > high zoom : 8 s + 48 s for selection
> > very high zoom : 15 s + 51 s for selection
> >
> > (very unprecise measure, but enough to make hypothesis)
> >
> >
> > It seems that renderer optimization is very efficient for both
> > unselected features and selected features
> > (optimizer draws only points separated by one pixel or so) as we can see
> > that very low zoom is very fast
> >
> > It seems that selection rendering do not limit the rendering to the
> > viewport (for high zoom
> > rendering is slow, and periods where features are drawn on screen
> > alternate with periods where nothing happen)
> >
> > Just hypothesis. Hope that helps.
> >
> > Michaël
> >
> >
> > Larry Becker a écrit :
> >> 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
> >> <mailto: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 <http://www.beopen.it>
> >> >
> >> >
> >> >
> >> > On Fri, Feb 19, 2010 at 5:42 PM, Larry Becker
> >> <becker.la...@gmail.com <mailto: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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> >>
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> >>
> >
> >
> >
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>
>
> ------------------------------------------------------------------------------
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--
Larry Becker
Integrated Systems Analysts, Inc.
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