On 08/21/2011 05:54 AM, CAB wrote:
Hi, All,
Sorry if this complaint appears twice on this list.
I have been using Matplotlib for a while, and I'm getting to the point
where I'd like to embed the output in a Tk GUI application. I'm new to
Tkinter. Here is the problem. Using the script that's in the "examples"
page on the web documentation, I run "embedding_in_tk.py". That works.
But if I uncomment the Tkinter-style "Quit" button that is at the bottom
of this script, any attempt to quit using the Quit button causes the
following error:
Fatal Python Error: PyEval_RestoreThread: NULL tstate
That's probably why the button was commented out. I think the problem
here is that using these gui toolkits is tricky, and the tk examples
were never worked out adequately. There are various ways of putting a
quit button back into the example. Try the one attached. If it works
for you, I will make it replace the present example, and I will delete
the embedding_in_tk2.py example because it adds nothing of interest.
Eric
I am using clean installs of Python 2.7, numpy 1.6.1, and matplotlib
1.0.1 (all 32-bit versions running under a Win 7 64-bit OS). I have not
modified the matplotlibrc. Given that this is not working "out of the
box", I'm wondering if there is a bug in FigureCanvasTkAgg or the tkagg
backend in general.
A look at the archives shows a user named Jakob having a similar
problem, but the solution (if any) was not posted.
Any help on this front is appreciated.
Chad
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#!/usr/bin/env python
import matplotlib
matplotlib.use('TkAgg')
from numpy import arange, sin, pi
from matplotlib.backends.backend_tkagg import FigureCanvasTkAgg, NavigationToolbar2TkAgg
from matplotlib.figure import Figure
import Tkinter as Tk
import sys
root = Tk.Tk()
root.wm_title("Embedding in TK")
f = Figure(figsize=(5,4), dpi=100)
a = f.add_subplot(111)
t = arange(0.0,3.0,0.01)
s = sin(2*pi*t)
a.plot(t,s)
# a tk.DrawingArea
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)
def _quit():
root.quit() # stops mainloop
root.destroy() # this is necessary on Windows to prevent
# Fatal Python Error: PyEval_RestoreThread: NULL tstate
button = Tk.Button(master=root, text='Quit', command=_quit)
button.pack(side=Tk.BOTTOM)
Tk.mainloop()
# If you put root.destroy() here, it will cause an error if
# the window is closed with the window manager.
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