Hello! I am also using two axes in a plot and want to be able to pick the lines of both axes. So far I used MPL 0.99.3 and a button on my interface to change the z-order of the axes in order to be able to pick lines of the "active" axes and to see the correct x/y data in the navigation toolbar. The callback code of my button is basically the code from othererik.
Since MPL 1.0.0 I have the problem that lines of the second axes simply disappear from the plot whenever the plot is redrawn and it's zorder is higher. Here is my example code: http://old.nabble.com/file/p30717629/twinxtest.py twinxtest.py ----------------------- import matplotlib matplotlib.use('TkAgg') from numpy import arange, sin, pi, cos from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg from matplotlib.figure import Figure import Tkinter as Tk root = Tk.Tk() f = Figure(figsize=(5,4), dpi=100) ax1 = f.add_subplot(111) ax2 = ax1.twinx() t = arange(0.0,3.0,0.01) s1 = sin(2*pi*t) s2 = 2*cos(2*pi*t) ax1.plot(t,s1,color='red', picker=True) ax2.plot(t,s2,picker=True) def pick_cb(event): if event.artist.get_lw() > 1: event.artist.set_lw(1) else: event.artist.set_lw(3) f.canvas.draw() def toggle(): if ax1.get_zorder() == 0: ax1.set_zorder(0.1) ax2.set_zorder(0) else: ax1.set_zorder(0) ax2.set_zorder(0.1) canvas = FigureCanvasTkAgg(f, master=root) canvas.show() canvas.get_tk_widget().pack(side=Tk.TOP, fill=Tk.BOTH, expand=1) toolbar = NavigationToolbar2TkAgg(canvas, root) toolbar.update() canvas._tkcanvas.pack(side=Tk.TOP, fill=Tk.BOTH, expand=1) canvas.mpl_connect('pick_event', pick_cb) button = Tk.Button(master=root, text='Toggle', command=toggle) button.pack(side=Tk.BOTTOM) Tk.mainloop() ------------------ Right after start I can only pick the blue line and both lines are properly shown even when I resize the plot. When I hit the "Toggle" button now I can pick the red line but the pick event callback also calls canvas.draw() which let's the blue line disappear. When I click "Toggle" and call canvas.draw() again by resizing the window, the blue line is visible again. In Matplotlib 0.99.3 everything worked as I expected with this code. Both lines were always visible. -Stephan -- View this message in context: http://old.nabble.com/onpick-on-a-2-y-plot-%28-via-twinx%28%29-%29-seems-to-only-allow-picking-of-second-axes%27s-artists-tp25049128p30717629.html Sent from the matplotlib - users mailing list archive at Nabble.com. ------------------------------------------------------------------------------ Protect Your Site and Customers from Malware Attacks Learn about various malware tactics and how to avoid them. Understand malware threats, the impact they can have on your business, and how you can protect your company and customers by using code signing. http://p.sf.net/sfu/oracle-sfdevnl _______________________________________________ Matplotlib-users mailing list Matplotlib-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/matplotlib-users
