Description
Bug report
Bug summary
By default, the imshow plots format the bottom tooltip as x={x}, y={y} [{z}]. I wanted to change this behavior, so I followed this answer. However, it seems that with newer version of mpl, Axes.format_coord only controls the coordinate format and not the z value, which is shown in square parentheses. Looking at https://matplotlib.org/api/axes_api.html#interactive, I find it intuitive that Axes.format_cursor_data would do what I need, however it appears to do nothing (or, at the very least, I cannot get to trigger it with the code below).
Code for reproduction
import numpy as np
import matplotlib.pyplot as plt
img = np.sin(np.linspace(-4, 4, 50)).reshape(-1, 1) + np.zeros((1, 50))
fig, ax = plt.subplots()
ax.imshow(img)
def wrapper(f):
def wrapped(*args, **kwargs):
print(f.__name__, 'is called!')
return f(*args, **kwargs)
return wrapped
ax.format_cursor_data = wrapper(ax.format_cursor_data)
plt.show()
# now play around with the plot and try to make it print somethingActual outcome
No message is being printed when mousing over the figure.
Expected outcome
The print statement from wrapped firing when mousing over the figure.
Note
I may be misunderstanding the API by expecting Axes.format_cursor_data to format the value in square parentheses, when in reality it does something completely different. In this case, please consider this issue as a request for documentation instead. I encountered this problem while troubleshooting another apparent bug, which I will submit in a moment.
Edit: the other issue is #12282.
Matplotlib version
- Operating system: Xubuntu 18.04
- Matplotlib version: 2.1.2
- Matplotlib backend (
print(matplotlib.get_backend())): Qt5Agg - Python version: 3.6
Default conda channel.