Re: [matplotlib-devel] zooming related bug? fades to white.
[EMAIL PROTECTED] wrote: > Hi Eric, > > This goes back a bit, but did you get any resolution to the fading problem? > I'm having the same problem at the moment, with the latest versions of > matplotlib using wxagg on windows. > > Thanks > John > > > John, http://www.mail-archive.com/matplotlib-devel@lists.sourceforge.net/msg00513.html I'm not sure whether this is different in the trunk now. By "latest versions" do you mean svn trunk, or 0.91.2? I just tried testing with imshow(rand(2,2)) followed by multiple zoom-to-rect operations, and I am not seeing the fade-out, but I am seeing the CPU tied up for 10s of seconds. In fact, I can get this with only one or two zooms. Eric - 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] zooming related bug? fades to white.
Glad I'm not the only one... well, I did some more investigation. I get that slowdown too, and it seems potentially related. the slowdown is happening in the call im.resize(int(widthDisplay+0.5), int(heightDisplay+0.5), norm=self._filternorm, radius=self._filterrad) near line 162 in image.py as you zoom, the time it takes to execute that line grows exponentially. this is where it heads into compiled dll land as resize is impemented in _image.cpp see here: http://matplotlib.svn.sourceforge.net/viewvc/matplotlib/trunk/matplotlib/src/_image.cpp?view=markup I don't have a build setup for matplotlib, so I am holding off on doing some printf investigations on _image.cpp, but perhaps this can help track it down? Since it is independent of interpolation, shouldn't it be something going on between lines 328 and 445 of _image.cpp? t Eric Firing wrote: > I have verified this behavior briefly on a Linux machine. In > addition, the redraw after zoom gets extremely slow. I have never > worked with the image internals and I don't have any idea where the > problem is coming from. > > Eric > > Tim Hirzel wrote: >> To the fantastic matplotlib developers, >> I am having a strange behavior when using zooming. I have tried it >> with WX, Wxagg, and TKagg, and with Numeric and numpy. It occurs in >> multiple interpolation types as well. The best way to see this >> behavior is to use the image_interp.py example. If you zoom in >> enough, the image starts to fade to white, and then turn completely >> white. If you zoom in to about where the zoom the axes area spans >> 0.1 units, it should still look fine, but then a span of 0.01 unit >> will be all white. If you zoom in slowly to where the color is >> starting to wash out to white, then resize the window, you will see >> more strange whitening behavior (the color fluctuates between white >> and the correct color as you change the window size). This is on a >> windows machine with Python 2.4. >> Another clue. if I save the white appearing axes to a png, it looks >> fine. >> the way it fades out almost seems like something going wrong with an >> alpha value somewhere... >> any thoughts? >> >> thanks, >> Tim > > - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV ___ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
Re: [matplotlib-devel] zooming related bug? fades to white.
I have verified this behavior briefly on a Linux machine. In addition, the redraw after zoom gets extremely slow. I have never worked with the image internals and I don't have any idea where the problem is coming from. Eric Tim Hirzel wrote: > To the fantastic matplotlib developers, > I am having a strange behavior when using zooming. I have tried it with > WX, Wxagg, and TKagg, and with Numeric and numpy. It occurs in multiple > interpolation types as well. The best way to see this behavior is to > use the image_interp.py example. If you zoom in enough, the image > starts to fade to white, and then turn completely white. If you zoom in > to about where the zoom the axes area spans 0.1 units, it should still > look fine, but then a span of 0.01 unit will be all white. If you zoom > in slowly to where the color is starting to wash out to white, then > resize the window, you will see more strange whitening behavior (the > color fluctuates between white and the correct color as you change the > window size). This is on a windows machine with Python 2.4. > Another clue. if I save the white appearing axes to a png, it looks fine. > the way it fades out almost seems like something going wrong with an > alpha value somewhere... > any thoughts? > > thanks, > Tim - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV ___ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
[matplotlib-devel] zooming related bug? fades to white.
To the fantastic matplotlib developers, I am having a strange behavior when using zooming. I have tried it with WX, Wxagg, and TKagg, and with Numeric and numpy. It occurs in multiple interpolation types as well. The best way to see this behavior is to use the image_interp.py example. If you zoom in enough, the image starts to fade to white, and then turn completely white. If you zoom in to about where the zoom the axes area spans 0.1 units, it should still look fine, but then a span of 0.01 unit will be all white. If you zoom in slowly to where the color is starting to wash out to white, then resize the window, you will see more strange whitening behavior (the color fluctuates between white and the correct color as you change the window size). This is on a windows machine with Python 2.4. Another clue. if I save the white appearing axes to a png, it looks fine. the way it fades out almost seems like something going wrong with an alpha value somewhere... any thoughts? thanks, Tim - Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV ___ Matplotlib-devel mailing list Matplotlib-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-devel
