Merge pull request matplotlib#8453 from dstansby/capture-lines

DOC: Manually collect lines on checkbox example

examples/widgets/check_buttons.py

@@ -8,12 +8,12 @@
 s2 = np.sin(6*np.pi*t)
 
 fig, ax = plt.subplots()
-ax.plot(t, s0, visible=False, lw=2, color='k', label='2 Hz')
-ax.plot(t, s1, lw=2, color='r', label='4 Hz')
-ax.plot(t, s2, lw=2, color='g', label='6 Hz')
+l0, = ax.plot(t, s0, visible=False, lw=2, color='k', label='2 Hz')
+l1, = ax.plot(t, s1, lw=2, color='r', label='4 Hz')
+l2, = ax.plot(t, s2, lw=2, color='g', label='6 Hz')
 plt.subplots_adjust(left=0.2)
 
-lines = ax.get_lines()
+lines = [l0, l1, l2]
 
 # Make checkbuttons with all plotted lines with correct visibility
 rax = plt.axes([0.05, 0.4, 0.1, 0.15])