未调用 Wedge 的 pick_event 处理程序

Question

I have the below code to display a wedge, and I would like to do something once a user clicks on the patch. Therefore I connected a handler to the "pick_event" and I made enabled picking the patch by passing the picker=True keyword arg.

All is fine, except when I actually click on the patch nothing happens, ie the handler seems to not get called.

Can anyone reproduce the issue or propose a fix?

from matplotlib.patches import Wedge
from matplotlib.collections import PatchCollection
import matplotlib.pyplot as plt

patches = [Wedge((5., 5.), 0.5, 30., 330., picker=True)]

fig, ax = plt.subplots()
ax.add_collection(PatchCollection(patches))
ax.set_xlim([0, 10.])
ax.set_ylim([0, 10.])

fig.canvas.mpl_connect('pick_event', lambda evt: print(evt))

plt.show()

When I add another ax.scatter([2.5], [2.5], picker=True) and click on that point instead, the handler is properly called.

Answer 1

I think you need to use the set_picker function of the PatchCollection. I didn't try but I found something of that sort in the documentation. set_picker documentation