Bug report

Bug summary

MouseEvent.x is an int but MouseEvent.y is a float.

Code for reproduction

import numpy as np
import matplotlib.pyplot as plt


def onclick(event):
    print(event.x, event.y)
    print(type(event.x), type(event.y))


plt.imshow(np.zeros((32, 32)))
plt.gcf().canvas.mpl_connect('button_press_event', onclick)
plt.show()

Actual outcome

After randomly clicking on the image:

328 243.0
<class 'int'> <class 'numpy.float64'>
299 148.0
<class 'int'> <class 'numpy.float64'>
260 247.0
<class 'int'> <class 'numpy.float64'>

Expected outcome

328 243
<class 'int'> <class 'int'>
299 148
<class 'int'> <class 'int'>
260 247
<class 'int'> <class 'int'>

Matplotlib version

• Operating system: Ubuntu 18.04
• Matplotlib version: 2.2.2 (installed from pip)
• Matplotlib backend (print(matplotlib.get_backend())): TkAgg
• Python version: Python 3.6.5
• Jupyter version (if applicable):
• Other libraries: