[Matplotlib-users] Event connect error when using Tk and scrolling

[Scott Lasley]

Juan,

I installed ActiveTCL8.5.18 as described on python.org's Tcl/Tk page for macOS <https://www.python.org/download/mac/tcltk/> and now the script runs under python3.6 without errors when scrolling with the trackpad.  If your usage allows, you should consider installing a newer version of Tcl/Tk if you are using python.org's python or switch to Anaconda's python.

Scott


> On Jan 10, 2017, at 11:33 AM, Ryan May <rmay31 at gmail.com> wrote:
> 
> Works for me on macOS 10.12.2, Python 3.5.2 (conda-forge) and matplotlib 2.0rc2.
> 
> Ryan
> 
> On Tue, Jan 10, 2017 at 12:48 AM, Scott Lasley <selasley at icloud.com> wrote:
> I get the error when running under python3.6 and scrolling with the trackpad.
> OS X 10.12.2 with the system installed Tk version 8.5, python 3.6.0, matplotlib 2.0.0rc2+2939.g109251f
> 
> Traceback (most recent call last):
>   File "<stdin>", line 1, in <module>
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/pyplot.py", line 252, in show
>     return _show(*args, **kw)
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/backend_bases.py", line 188, in __call__
>     self.mainloop()
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/site-packages/matplotlib/backends/backend_tkagg.py", line 71, in mainloop
>     Tk.mainloop()
>   File "/Library/Frameworks/Python.framework/Versions/3.6/lib/python3.6/tkinter/__init__.py", line 557, in mainloop
>     _default_root.tk.mainloop(n)
> UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
> >>> UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
> 
> 
> The script works when run under python 2.7.13 and scrolling with the trackpad.
> 
> 
> > On Jan 9, 2017, at 23:40, Thomas Caswell <tcaswell at gmail.com> wrote:
> >
> > I can not reproduce this on linux :/
> >
> > This looks like it is coming out of Tk's handling of the scroll event before it is handed off to mpl.
> >
> > Tom
> >
> > On Mon, Jan 9, 2017 at 10:28 PM Juan Nunez-Iglesias <jni.soma at gmail.com> wrote:
> > Hi all,
> >
> > I’m trying to play with the `basic_mpl_connect.py` example from Ben Root’s “Interactive Applications Using Matplotlib” book, reproduced below in its entirety. (With the addition of selecting TkAgg as the backend. I need to do this because I’m aiming to embed into a Tk app *and* the MacOSX backend doesn’t capture my keystrokes.)
> >
> > Everything works fine, but when I try to use the scroll wheel on my mouse, or two-finger scrolling on my Macbook trackpad, everything dies with the following message:
> >
> > Traceback (most recent call last):
> >   File "basic_mpl_connect.py", line 20, in <module>
> >     plt.show()
> >   File "/Users/jni/conda/envs/ana/lib/python3.5/site-packages/matplotlib/pyplot.py", line 252, in show
> >     return _show(*args, **kw)
> >   File "/Users/jni/conda/envs/ana/lib/python3.5/site-packages/matplotlib/backend_bases.py", line 192, in __call__
> >     self.mainloop()
> >   File "/Users/jni/conda/envs/ana/lib/python3.5/site-packages/matplotlib/backends/backend_tkagg.py", line 74, in mainloop
> >     Tk.mainloop()
> >   File "/Users/jni/conda/envs/ana/lib/python3.5/tkinter/__init__.py", line 405, in mainloop
> >     _default_root.tk.mainloop(n)
> > UnicodeDecodeError: 'utf-8' codec can't decode byte 0xff in position 0: invalid start byte
> >
> > This is true even if I explicitly connect the “scroll_event” (below).
> >
> > Any ideas?
> >
> > Thanks,
> >
> > Juan.
> >
> > ===================================
> >
> > import matplotlib
> > matplotlib.use('TkAgg')
> > matplotlib.verbose.level = 'debug'
> > import matplotlib.pyplot as plt
> >
> > def process_key(event):
> >     print("Key:", event.key)
> >
> > def process_button(event):
> >     print("Button:", event.x, event.y, event.xdata, event.ydata, event.button)
> >
> > def process_scroll(event):
> >     print("Scroll")
> >
> > fig, ax = plt.subplots(1, 1)
> > fig.canvas.mpl_connect('key_press_event', process_key)
> > fig.canvas.mpl_connect('button_press_event', process_button)
> > fig.canvas.mpl_connect('scroll_event', process_scroll)
> > plt.show()
> > _______________________________________________
> > Matplotlib-users mailing list
> > Matplotlib-users at python.org
> > https://mail.python.org/mailman/listinfo/matplotlib-users
> 
> -- 
> Ryan May
> 

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