[Matplotlib-users] Window flickering with Tk backend (was: Subplot x-axis shared with other subplots y-axis)

[Juan Nunez-Iglesias]

Oops, revisiting this thread now, it looks like I only replied to Ben, instead of the list. Full thread below, but TL;DR: my 3D orthogonal views project:

https://github.com/jni/mpl-volume-viewer

is working (thanks to all on this list who helped so far!), but has the following problems:
- Experiences flickering when panning in the Tk backend
- Has no flickering with the MacOS backend, but then the keyboard bindings don’t work at all
- Is dog-slow in the nbagg backend.

Any suggestions to help with this would be much appreciated! To recap, here are the steps to reproduce:

- Download slice_view.py and put it in your PYTHONPATH or current working directory
- Download this example dataset:
https://www.dropbox.com/s/dj3oarx7bqx4us2/E_z2_512_1um_CONTROL.tif?dl=1
- Run this code:

import matplotlib
matplotlib.use('TkAgg’)  # change this to whatever you want to test

from skimage import io
import slice_view as sv

filename = '/path/to/E_z2_512_1um_CONTROL.tif'
image = io.imread(filename) / 4096

v = sv.SliceViewer(image, spacing=[5, 1, 1])
matplotlib.pyplot.show(block=True)


Thanks!

Juan.

---------- Forwarded message ----------
From: Juan Nunez-Iglesias <jni.soma at gmail.com>
Date: 11 Jul 2017, 12:06 PM +1000
To: Benjamin Root <ben.v.root at gmail.com>
Subject: Re: [Matplotlib-users] Subplot x-axis shared with other subplots y-axis

> Hi Ben, thanks for the tip! The point of using the ToolManager would be to get cross-backend support, so it might be easier for me to implement the backends I want with if-else statements, or some other kludgey way…
>
> I just thought I’d update the list with the status of my orthogonal views mini-project, which is backend-dependent:
>
> - working on Tk except for the flickering
> - working on macOS except the keyboard bindings don’t work — they go straight to the Terminal.
> - working on Notebook (Nbagg?), except it’s dog-slow.
>
> If anyone has suggestions for any of these problems, I would be very grateful!
>
> Juan.
>
> On 28 Jun 2017, 1:08 AM +1000, Benjamin Root <ben.v.root at gmail.com>, wrote:
> > re: cross-backend way to add buttons: There is experimental feature called "ToolManager", but I think it is only implemented for a couple of backends currently. You can see an example here:
> >
> > http://matplotlib.org/examples/user_interfaces/toolmanager.html
> >
> > > On Fri, Jun 23, 2017 at 12:17 AM, Juan Nunez-Iglesias <jni.soma at gmail.com> wrote:
> > > > Hey Tom,
> > > >
> > > > Thanks for that response, it was just what I needed! I had a fun infinite loop where the x-axis was updating the y-axis which was updating the x-axis which... =P But it was easy enough to sort out. =)
> > > >
> > > > I have a working orthogonal slice viewer here:
> > > > https://github.com/jni/mpl-volume-viewer/
> > > >
> > > > The problem I have now is that, if I set a mouse-click callback (this line and this line), and then I select any other tool from the toolbar, I get this super-obnoxious flickering, recorded here (macOS 10.12, Tk backend):
> > > > https://www.dropbox.com/s/qvfmgp0x36p6rb9/mpl-click-bug.mov?dl=0
> > > >
> > > > To reproduce:
> > > >
> > > > - Download slice_view.py and put it in your PYTHONPATH or current working directory
> > > > - Download this example dataset:
> > > > https://www.dropbox.com/s/dj3oarx7bqx4us2/E_z2_512_1um_CONTROL.tif?dl=1
> > > > - Run this code:
> > > >
> > > > import matplotlib
> > > > matplotlib.use('TkAgg')
> > > >
> > > > from skimage import io
> > > > import slice_view as sv
> > > >
> > > > filename = '/path/to/E_z2_512_1um_CONTROL.tif'
> > > > image = io.imread(filename) / 4096
> > > >
> > > > v = sv.SliceViewer(image, spacing=[5, 1, 1])
> > > > matplotlib.pyplot.show(block=True)
> > > >
> > > > Questions:
> > > > 1) Any ideas about how to fix the flickering?
> > > > 2) Is there a cross-backend way to add buttons to the toolbar? All the examples I've found online were backend-specific. (This way I could at least disable the callback at will.)
> > > >
> > > > Thanks!
> > > >
> > > > Juan.
> > > >
> > > > On 16 May 2017, 1:43 AM +1000, Thomas Caswell <tcaswell at gmail.com>, wrote:
> > > > > There are callbacks that fire when the limits are changed.  See
> > > > >
> > > > > https://matplotlib.org/examples/event_handling/viewlims.html
> > > > >
> > > > > for an example.
> > > > >
> > > > > This is probably the best route to go down as you can do other interesting things as the event goes by (like triggering computation, updating a openGL view window, etc) as well as updating the Matplotlib limits.
> > > > >
> > > > > Tom
> > > > >
> > > > > > On Mon, May 15, 2017 at 3:29 AM Juan Nunez-Iglesias <jni.soma at gmail.com> wrote:
> > > > > > > Hello,
> > > > > > >
> > > > > > > I’m trying to build an orthogonal-views volume viewer in Matplotlib like this one:
> > > > > > > https://imagej.nih.gov/ij/docs/guide/images/OrthogonalViews.png
> > > > > > >
> > > > > > > For this to work, I need to share the y-axis of the YZ (right) view/subplot with the x-axis of the XZ (bottom) view/subplot. Is this possible?
> > > > > > >
> > > > > > > Juan.
> > > > > > >
> > > > > > > _______________________________________________
> > > > > > > Matplotlib-users mailing list
> > > > > > > Matplotlib-users at python.org
> > > > > > > https://mail.python.org/mailman/listinfo/matplotlib-users
> > > >
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> >
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