Double event registered on mouse-click if legend is outside axes

Question

I have to plot several data sets in one plot. It is useful to be able to highlight one or more of the plots in order to compare them. For this, I toggle the line style of th

Answer 1

Another approach similar to tcaswell's solution counting events. Only 3 lines added to the original legend picking example. It uses python's function attributes.

def onpick(event):
    if onpick.count % 2 == 0:    #### LINE ADDED ####  
        # on the pick event, find the orig line corresponding to the
        # legend proxy line, and toggle the visibility
        legline = event.artist
        origline = lined[legline]
        vis = not origline.get_visible()
        origline.set_visible(vis)
        # Change the alpha on the line in the legend so we can see what lines
        # have been toggled
        if vis:
            legline.set_alpha(1.0)
        else:
            legline.set_alpha(0.2)
        fig.canvas.draw()
    onpick.count += 1    #### LINE ADDED ####

onpick.count = 0    #### LINE ADDED ####