Matplotlib 3.x: Update backend to modified versions of 'enter_notify_event'

From Matplotlib 3.x, the enter_notify_event requires a x and y coordinate as argument. If this is not passed, None is passed and a matplotlib.cbooks.deprecation.MatplotlibDeprecationWarning warning is raised.

Update the backend to support the x and y parameters in the future.

Here is an example how to temporarily overcome this problem:

‌

import matplotlib.pyplot as plt
import numpy as np
import warnings
import matplotlib.cbook
warnings.filterwarnings("ignore",category=matplotlib.cbook.deprecation.MatplotlibDeprecationWarning)

fig, ax = plt.subplots()
ax.plot(np.random.rand(10))

def onclick(event):
    print('%s click: button=%d, x=%d, y=%d, xdata=%f, ydata=%f' %
          ('double' if event.dblclick else 'single', event.button,
           event.x, event.y, event.xdata, event.ydata))

def onfigureenter(event):
    if event.x and event.y:
        print("onfigureenter: x=%f, y=%f, inaxes=%s" % (event.x, event.y,str(event.inaxes)))
    else:
        print("onfigureenter: x=<None>, y=<None>, inaxes=%s"  % str(event.inaxes))

cid = fig.canvas.mpl_connect('button_press_event', onclick)
fig.canvas.mpl_connect('figure_enter_event', onfigureenter)

Remove the filterwarnings command in line 5 to force the warning. Click the canvas to “activate” the plot and then move the mouse out and back again into the canvas.

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