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==============
Legend picking
==============
Enable picking on the legend to toggle the original line on and off
.. note::
This example exercises the interactive capabilities of Matplotlib, and this
will not appear in the static documentation. Please run this code on your
machine to see the interactivity.
You can copy and paste individual parts, or download the entire example
using the link at the bottom of the page.
"""
import matplotlib.pyplot as plt
import numpy as np
t = np.linspace(0, 1)
y1 = 2 * np.sin(2*np.pi*t)
y2 = 4 * np.sin(2*np.pi*2*t)
fig, ax = plt.subplots()
ax.set_title('Click on legend line to toggle line on/off')
line1, = ax.plot(t, y1, lw=2, label='1 Hz')
line2, = ax.plot(t, y2, lw=2, label='2 Hz')
leg = ax.legend(fancybox=True, shadow=True)
lines = [line1, line2]
lined = {} # Will map legend lines to original lines.
for legline, origline in zip(leg.get_lines(), lines):
legline.set_picker(True) # Enable picking on the legend line.
lined[legline] = origline
def on_pick(event):
# On the pick event, find the original line corresponding to the legend
# proxy line, and toggle its visibility.
legline = event.artist
origline = lined[legline]
visible = not origline.get_visible()
origline.set_visible(visible)
# Change the alpha on the line in the legend, so we can see what lines
# have been toggled.
legline.set_alpha(1.0 if visible else 0.2)
fig.canvas.draw()
fig.canvas.mpl_connect('pick_event', on_pick)
plt.show()
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