Matplotlib - _tkinter.TclError: bad screen distance “320.0” [closed]

问题

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Closed 8 years ago.

File "main.py", line 52, in <module>
    r2n(name)

  File "C:\Users\Riki\Documents\Universita\Erasmus\Personalization and Metadata modeling 02817\Final Project\friends_followers__redis_to_networkx.py", line 69, in r2n

    **nx.draw_spring(g,node_size=50,node_color='#32CD32',node_shape='o',edge_color='.1',with_labels=True,width=0.5)**

  File "C:\Python27\lib\site-packages\networkx-1.6-py2.7.egg\networkx\drawing\nx_pylab.py", line 876, in draw_spring
    draw(G,spring_layout(G),**kwargs)

  File "C:\Python27\lib\site-packages\networkx-1.6-py2.7.egg\networkx\drawing\nx_pylab.py", line 124, in draw
    cf=pylab.gcf()

  File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 369, in gcf
    return figure()

  File "C:\Python27\lib\site-packages\matplotlib\pyplot.py", line 343, in figure
    **kwargs)

  File "C:\Python27\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 81, in new_figure_manager
    canvas = FigureCanvasTkAgg(figure, master=window)

  File "C:\Python27\lib\site-packages\matplotlib\backends\backend_tkagg.py", line 188, in __init__
    self._tkcanvas.create_image(w/2, h/2, image=self._tkphoto)

  File "C:\Python27\lib\lib-tk\Tkinter.py", line 2198, in create_image
    return self._create('image', args, kw)

  File "C:\Python27\lib\lib-tk\Tkinter.py", line 2189, in _create
    *(args + self._options(cnf, kw))))

**_tkinter.TclError: bad screen distance "320.0"**

Hi, I'm working on Python 2.7 for Windows 64bit. Suddenly that problem occurred, but my code should be ok because was working previously (without any change the plots were visible).

I think that is a problem with the library, what shall I do?

回答1:

Try converting your coordinates to an int before creating the canvas item. For example:

self._tkcanvas.create_image(int(w/2), int(h/2), image=self._tkphoto)

---

I appreciate this answer very much, as it helped me a lot; I wish I could add a separate answer, but I can't as it's closed - so posting an edit:

A solution that worked for me that didn't require changing the matplotlib library files, is to simply make a new class to override a method, the two problematic methods being __init__ and resize (and strangely, all I need is to overload resize, didn't even had to put in the fix there, and it started working for me?)

Anyways, take note that the below is copied from the Python2.7 Matplotlib - you're probably better off checking for your local matplotlib version first, and copying from there:

# copy of /usr/lib/pymodules/python2.7/matplotlib/backends/backend_tkagg.py
# with fix:
class FigureCanvasTkAggFix(FigureCanvasTkAgg):
  def __init__(self, figure, master=None, resize_callback=None):
    matplotlib.backends.backend_tkagg.FigureCanvasAgg.__init__(self, figure)
    self._idle = True
    t1,t2,w,h = self.figure.bbox.bounds
    w, h = int(w), int(h)
    self._tkcanvas = tk.Canvas(
      master=master, width=w, height=h, borderwidth=4)
    self._tkphoto = tk.PhotoImage(
      master=self._tkcanvas, width=w, height=h)
    self._tkcanvas.create_image(int(w/2), int(h/2), image=self._tkphoto) # fix
    self._resize_callback = resize_callback
    self._tkcanvas.bind("<Configure>", self.resize)
    self._tkcanvas.bind("<Key>", self.key_press)
    self._tkcanvas.bind("<Motion>", self.motion_notify_event)
    self._tkcanvas.bind("<KeyRelease>", self.key_release)
    for name in "<Button-1>", "<Button-2>", "<Button-3>":
      self._tkcanvas.bind(name, self.button_press_event)
    for name in "<ButtonRelease-1>", "<ButtonRelease-2>", "<ButtonRelease-3>":
      self._tkcanvas.bind(name, self.button_release_event)
    for name in "<Button-4>", "<Button-5>":
      self._tkcanvas.bind(name, self.scroll_event)
    root = self._tkcanvas.winfo_toplevel()
    root.bind("<MouseWheel>", self.scroll_event_windows)
    self._master = master
    self._tkcanvas.focus_set()
    self.sourced = dict()
    def on_idle(*ignore):
      self.idle_event()
      return True
  def resize(self, event):
    width, height = event.width, event.height
    printse("WH", width, height, "\n")
    if self._resize_callback is not None:
      self._resize_callback(event)
    # compute desired figure size in inches
    dpival = self.figure.dpi
    winch = width/dpival
    hinch = height/dpival
    self.figure.set_size_inches(winch, hinch)
    self._tkcanvas.delete(self._tkphoto)
    self._tkphoto = tk.PhotoImage(
      master=self._tkcanvas, width=width, height=height)
    self._tkcanvas.create_image(width/2,height/2,image=self._tkphoto)
    self.resize_event()
    self.show()

来源：https://stackoverflow.com/questions/10374841/matplotlib-tkinter-tclerror-bad-screen-distance-320-0