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POCommunication between windows with python matplotlib using gtk.WindowGroup
 

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  1. POCommunication between windows with python matplotlib using gtk.WindowGroup
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    <p>I am developing an application in python which plots information using <strong>matplotlib</strong>, <strong>numpy</strong> and <strong>gtk</strong>. I am plotting numpy data using matplotlib, the user can change some parameters in widget to modify the plot </p> <p>For design reasons I want to separate the plot (and data) from the control GUI, then I am plotting the data in one window and I have the controls in a separated window. In <strong>gtk</strong> I found the <em>WindowGroup</em> widget that looks can send data over multiple windows, however I cannot find the how!</p> <p>The following code shows a simplification of the problem: I plot a sine in a window, the user can modify the variable <em>fm</em> in the window with the vertical adjustment bar (event). When I run the script I can see that the event (move the vertical adjustment bar) triggers the function but does't actualize the plot. </p> <p>How can change the plot? or send messages between two windows using the <em>WindowGroup</em> widget?</p> <pre><code>#!/usr/bin/python import gtk import numpy import matplotlib.pyplot as plt from matplotlib.backends.backend_gtkagg \ import FigureCanvasGTKAgg as FigureCanvas def update_hscale(event): global t fm = hscale.get_value() y_new = numpy.sin(2*fm*t) l.set_ydata(y_new) plt.draw() print "doing fm=", fm # define the window group window_group=gtk.WindowGroup() # matplotlib plot in window 1 fm = 5.0 t = numpy.arange(200) y = numpy.sin(2*fm*t) fig = plt.figure(1) ax = fig.add_subplot(111) l, = ax.plot(t, y) win1 = gtk.Window() win1.connect("destroy", gtk.main_quit) win1.set_default_size(800,300) vbox1 = gtk.VBox() canvas = FigureCanvas(fig) vbox1.pack_start(canvas, fill=True) win1.add(vbox1) # controls in window 2 win2 = gtk.Window() vbox2 = gtk.VBox() adj = gtk.Adjustment(0.0, -5, 5, 1.0, 1.0, 1.0) hscale = gtk.HScale(adj) hscale.set_size_request(200, 30) vbox2.pack_start(hscale) hscale.connect("value-changed", update_hscale) win2.add(vbox2) # adding windows to window_group window_group.add_window(win1) window_group.add_window(win2) win1.set_default_size(400,300) win1.show_all() win2.show_all() gtk.main() </code></pre>
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