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

[Thomas Caswell]

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()
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