Yeah, it seems to me that I haven't seen much speed impact from rendering fairly large linestrings. I suppose it's possible that if the linestring was really complex the intersection() computation might be slow, however.
In any case, computing a full intersection() is definitely doing more work than required for rendering. So this would be a good thing to optimize. It's one of those things which isn't necessarily all that noticeable, but is quietly burning cycles all the time. Larry Becker wrote: > Better send it to me too. All the cases I've found in the wild render very > quickly. See the attached for an example. > > Larry > > On Mon, Feb 22, 2010 at 4:13 PM, Martin Davis <mbda...@refractions.net>wrote: > > >> Stefan, for future reference can you send the linestring, and the >> viewport which causes the problem? >> >> Stefan Steiniger 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 >>>> >>>> >>>> >> ------------------------------------------------------------------------------ >> >>>> Download Intel® Parallel Studio Eval >>>> Try the new software tools for yourself. Speed compiling, find bugs >>>> proactively, and fine-tune applications for parallel performance. >>>> See why Intel Parallel Studio got high marks during beta. >>>> http://p.sf.net/sfu/intel-sw-dev >>>> _______________________________________________ >>>> Jump-pilot-devel mailing list >>>> Jump-pilot-devel@lists.sourceforge.net >>>> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >>>> >>>> >>> >> ------------------------------------------------------------------------------ >> >>> Download Intel® Parallel Studio Eval >>> Try the new software tools for yourself. Speed compiling, find bugs >>> proactively, and fine-tune applications for parallel performance. >>> See why Intel Parallel Studio got high marks during beta. >>> http://p.sf.net/sfu/intel-sw-dev >>> _______________________________________________ >>> Jump-pilot-devel mailing list >>> Jump-pilot-devel@lists.sourceforge.net >>> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >>> >>> >>> >> -- >> Martin Davis >> Senior Technical Architect >> Refractions Research, Inc. >> (250) 383-3022 >> >> >> >> ------------------------------------------------------------------------------ >> Download Intel® Parallel Studio Eval >> Try the new software tools for yourself. Speed compiling, find bugs >> proactively, and fine-tune applications for parallel performance. >> See why Intel Parallel Studio got high marks during beta. >> http://p.sf.net/sfu/intel-sw-dev >> _______________________________________________ >> Jump-pilot-devel mailing list >> Jump-pilot-devel@lists.sourceforge.net >> https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel >> >> > > > > > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------ > > ------------------------------------------------------------------------------ > Download Intel® Parallel Studio Eval > Try the new software tools for yourself. Speed compiling, find bugs > proactively, and fine-tune applications for parallel performance. > See why Intel Parallel Studio got high marks during beta. > http://p.sf.net/sfu/intel-sw-dev > ------------------------------------------------------------------------ > > _______________________________________________ > Jump-pilot-devel mailing list > Jump-pilot-devel@lists.sourceforge.net > https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel > -- Martin Davis Senior Technical Architect Refractions Research, Inc. (250) 383-3022 ------------------------------------------------------------------------------ Download Intel® Parallel Studio Eval Try the new software tools for yourself. Speed compiling, find bugs proactively, and fine-tune applications for parallel performance. See why Intel Parallel Studio got high marks during beta. http://p.sf.net/sfu/intel-sw-dev _______________________________________________ Jump-pilot-devel mailing list Jump-pilot-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/jump-pilot-devel
