matplotlib — interactively select points or locations?

Question

In R, there is a function locator which is like Matlab\'s ginput where you can click on the figure with a mouse and select any x,y coordinate. In a

Answer 1

You may want to use a pick event :

fig = figure()
ax1 = fig.add_subplot(111)
ax1.set_title('custom picker for line data')
line, = ax1.plot(rand(100), rand(100), 'o', picker=line_picker)
fig.canvas.mpl_connect('pick_event', onpick2)

Tolerance set by picker parameter there:

line, = ax1.plot(rand(100), 'o', picker=5)  # 5 points tolerance