Closed
Description
Pick events on legends work perfectly unless the legend is moved out of the axes using bbox_to_anchor. After that, the pick event gets called twice for a single mouse click.
The following code demonstrates the error. The bug appears when the legend line is clicked: the line toggles twice on a mouse click instead of once.
'''
Toggle plot line-styles between ':' and '-' when line is clicked or
when the corresponding legend line is clicked.
'''
import pylab
import numpy
# Create data for plotting
t = numpy.linspace(0, 1.0, 100)
a = numpy.sin(2*numpy.pi*t)
# Set up figure
fig = pylab.figure()
ax = pylab.subplot(111)
# Plot figures
lines = []
for i in range(5):
line = ax.plot(t, (i+1)*a, linestyle=':', picker=5, label='line%d'%(i+1))
lines.append(line[0]) # Save plot lines
# Create legend
leg = ax.legend(bbox_to_anchor=(1.01, 1), loc=2) # Does not work as expected
# leg = ax.legend() # Works!!
# Get legend lines
leglines = leg.get_lines()
# Set event for legend lines
for line in leglines:
line.set_picker(5)
# Create a 2 way mapping between legend lines <-> plot lines
line2leg = dict(zip(lines+leglines, leglines+lines))
# Define event function
def onpick(event):
thisline = event.artist
if thisline.get_linestyle()==':':
print ": -> -" # For debugging
thisline.set_linestyle('-')
line2leg[thisline].set_linestyle('-')
else:
print "- -> :" # For debugging
thisline.set_linestyle(':')
line2leg[thisline].set_linestyle(':')
fig.canvas.draw()
# connect event function
fig.canvas.mpl_connect('pick_event', onpick)
pylab.show()
(See also: http://stackoverflow.com/questions/16278358/double-event-registered-on-mouse-click-if-legend-is-outside-axes)