mpldatacursor doesn't work when matplotlib plot embedded in tkinter canvas

[juliaolkhovyk]

Here is my code

import matplotlib
import tkinter

from matplotlib.backends.backend_tkagg import (
    FigureCanvasTkAgg, NavigationToolbar2Tk)
import matplotlib.pyplot as plt
from mpldatacursor import datacursor
matplotlib.use('Qt5Agg')
root = tkinter.Tk()
fig, ax = plt.subplots(1, 1)

X, Y = [], []

X.append(0)
Y.append(0)
count = 1
for i in range(1, 10):
    X.append(X[i-1] + 2)
    for j in range(1, 10):
        Y.append(Y[j-1] + 2)
        ax.scatter(X[i], Y[j], color='blue', s=10, label='{}'.format(count))
        count += 1


ax.grid(which='major', color='#CCCCCC', linestyle='--')
ax.grid(which='minor', color='#CCCCCC', linestyle=':')
datacursor(formatter='{label}'.format, display='multiple')
canvas = FigureCanvasTkAgg(fig, master=root)
canvas.draw()
canvas.get_tk_widget().pack(side=tkinter.TOP, fill=tkinter.BOTH, expand=1)

toolbar = NavigationToolbar2Tk(canvas, root)
toolbar.update()
canvas.get_tk_widget().pack(side=tkinter.TOP, fill=tkinter.BOTH, expand=1)
root.mainloop()

the hint

the hint is supposed to be shown after clicking on any blue dot on the plot, even though when I used without tkinter library it worked perfectly

[joferkington]

@Yulia444 - For the case where you're constructing the figure and embedding in a lower-level widget, mpldatacursor can't automatically find which Matplotlib artists and figures it should use. That's because things are managed in a different way than they would be if you didn't embed the plot, and there's no global index of figures/etc for mpldatacursor to look at.

Therefore, you should explicitly pass in the artists that you'd like mpldatacursor to work with. E.g. https://github.com/joferkington/mpldatacursor/blob/master/examples/basic.py

The first argument to datacursor is always an artist or a sequence of artists. Artists are what matplotlib plotting routines return. In your case above, you'd likely want to plot everything with a single scatter call, but you could also append the artist that ax.scatter returns to a list and then pass the list into datacursor. (Also, for this case, you might have a look at point_labels, e.g. https://github.com/joferkington/mpldatacursor/blob/master/examples/labeled_points_example.py )

[juliaolkhovyk]

I launched the second example, clicked on the point and then the error occured:

Exception in Tkinter callback
Traceback (most recent call last):
File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\tkinter_init_.py", line 1883, in call
return self.func(*args)
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\matplotlib\backends_backend_tk.py", line 293, in button_press_event
FigureCanvasBase.button_press_event(
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\matplotlib\backend_bases.py", line 1854, in button_press_event
self.callbacks.process(s, mouseevent)
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\matplotlib\cbook_init_.py", line 229, in process
self.exception_handler(exc)
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\matplotlib\cbook_init_.py", line 81, in exception_printer
raise exc
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\matplotlib\cbook_init.py", line 224, in process
func(*args, **kwargs)
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 718, in _select
self(new_event)
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 235, in call
self._show_annotation_box(event)
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 275, in _show_annotation_box
self.update(event, annotation)
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 575, in update
annotation.set_text(self.formatter(**info))
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 348, in _formatter
x = self._format_coord(x, ax.xaxis)
File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 413, in _format_coord
return formatter.pprint_val(x)
AttributeError: 'ScalarFormatter' object has no attribute 'pprint_val'

[joferkington]

That's a change in matplotlib with version 3.3.0. There's a fix in master, but there hasn't been a release of mpldatacursor with that fix yet, as that version of matplotlib just came out. You'll need to update from master (e.g. `pip install git+https://github.com/joferkington/mpldatacursor`).

…

On Mon, Sep 28, 2020 at 2:54 AM Yulia444 ***@***.***> wrote: I launched the second example, clicked on the point and then the error occured: Exception in Tkinter callback Traceback (most recent call last): File "C:\Users\User\AppData\Local\Programs\Python\Python38\lib\tkinter_ *init*_.py", line 1883, in *call* return self.func(*args) File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\matplotlib\backends_backend_tk.py", line 293, in button_press_event FigureCanvasBase.button_press_event( File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\matplotlib\backend_bases.py", line 1854, in button_press_event self.callbacks.process(s, mouseevent) File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\matplotlib\cbook_*init*_.py", line 229, in process self.exception_handler(exc) File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\matplotlib\cbook_*init*_.py", line 81, in *exception_printer raise exc File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\matplotlib\cbook_init*.py", line 224, in process func(*args, **kwargs) File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 718, in _select self(new_event) File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 235, in *call* self._show_annotation_box(event) File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 275, in _show_annotation_box self.update(event, annotation) File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 575, in update annotation.set_text(self.formatter(**info)) File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 348, in _formatter x = self._format_coord(x, ax.xaxis) File "C:\Users\User\Desktop\Новая папка (2)\env\lib\site-packages\mpldatacursor\datacursor.py", line 413, in _format_coord return formatter.pprint_val(x) AttributeError: 'ScalarFormatter' object has no attribute 'pprint_val' — You are receiving this because you commented. Reply to this email directly, view it on GitHub <#100 (comment)>, or unsubscribe <https://github.com/notifications/unsubscribe-auth/AAG5MMYGAJKG33ON3O5KWNDSIA6NBANCNFSM4R3SLWPA> .