Re: [matplotlib-devel] Qt backends redrawing twice on zooming
Ted Drain wrote: > I've been investigating performance problems we've been having w/ the Qt > backends. One problems is that zooming takes forever. I've put a lot of > timing loops into the backends to see where things are happening and found a > couple of interesting items. > > The first is that agg seems to get much slower as you zoom in. The agg draw > time goes up as the zoom level goes up. These are plots that are completely > done w/ the Ellipse patch. Using the Arc patch helps but is about 10% > slower when not zooming. > Out of curiosity -- are you using matplotlib 0.91.2, or the SVN trunk? The SVN trunk has about 25% faster out-of-bounds vertex removal that should improve this. > The second (and reason for the email), is that the QtAgg backends are > redrawing the whole plot twice when zooming w/ the mouse. It looks like Darren has addressed this part... Cheers, Mike -- Michael Droettboom Science Software Branch Operations and Engineering Division Space Telescope Science Institute Operated by AURA for NASA - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
Re: [matplotlib-devel] Qt backends redrawing twice on zooming
On Monday 24 March 2008 08:09:56 am Michael Droettboom wrote: > Ted Drain wrote: > > I've been investigating performance problems we've been having w/ the Qt > > backends. One problems is that zooming takes forever. I've put a lot of > > timing loops into the backends to see where things are happening and > > found a couple of interesting items. > > > > The first is that agg seems to get much slower as you zoom in. The agg > > draw time goes up as the zoom level goes up. These are plots that are > > completely done w/ the Ellipse patch. Using the Arc patch helps but is > > about 10% slower when not zooming. > > Out of curiosity -- are you using matplotlib 0.91.2, or the SVN trunk? > The SVN trunk has about 25% faster out-of-bounds vertex removal that > should improve this. > > > The second (and reason for the email), is that the QtAgg backends are > > redrawing the whole plot twice when zooming w/ the mouse. > > It looks like Darren has addressed this part... That was a different redundant draw() call that Ted reported earlier. I just committed this fix, thanks Ted. Darren - This SF.net email is sponsored by: Microsoft Defy all challenges. Microsoft(R) Visual Studio 2008. http://clk.atdmt.com/MRT/go/vse012070mrt/direct/01/ ___ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
