matplotlib in Kivy

[Michael Bertolli]

Hi,

I'm attempting to use your matplotlib backend in Kivy, but running into trouble running the examples. I'm running with Kivy on OS X, and matplotlib 1.4.3. With each of the test_*.py example, I get the same error on lines of the form: 

figure, ax = plt.subplots()

For example, line 57 of test_plt.py. The error thrown is regarding the __init__(), and traces back to the event dispatcher:

 TypeError: __init__() takes exactly 2 arguments (1 given)

I've built basic functionality with Kivy (and am very comfortable with python in general), but debugging this is a level above my head. I'm sure it's a stupid setup problem on my end. 

Currently my work around is to use matplotlib to save *.png files and load them into the Kivy app, but I'm anxious to explore the backend you've developed!

Any help is appreciated to point me in the right direction,

Mik

[David Aldrich]

Are you using Kivy 1.9.1-dev?  The matplotlib backend won't work with 1.9.0.

David

[Leon A]

Im also getting the error below I am definitely using 1.9.1 on Ubuntu, any ideas?

 Traceback (most recent call last):
   File "backend_kivyagg.py", line 96, in <module>
     from kivy.garden.matplotlib.backend_kivy import FigureCanvasKivy,\
   File "/usr/local/lib/python2.7/dist-packages/kivy/garden/__init__.py", line 100, in load_module
     return self._load_module(fullname, moddir)
   File "/usr/local/lib/python2.7/dist-packages/kivy/garden/__init__.py", line 104, in _load_module
     ('', '', imp.PKG_DIRECTORY))
   File "/home/leon/.kivy/garden/garden.matplotlib/__init__.py", line 5, in <module>
     from kivy.garden.matplotlib.backend_kivyagg import FigureCanvasKivyAgg
   File "/home/leon/.kivy/garden/garden.matplotlib/backend_kivyagg.py", line 100, in <module>
     register_backend('png', 'backend_kivyagg', 'PNG File Format')
 TypeError: register_backend() takes exactly 2 arguments (3 given)
leon@ubuntu:~/.kivy/garden/garden.matplotlib$

[Yoel Koenka]

I ran into the same problem. Working on Mac, using Kivy 1.9.1.
Did anyone get this solved?

[Bill Janssen]

This works fine for me on all platforms, including Mac.  I'm using matplotlib 2.0 -- what version of matplotlib are you using?

Bill

[Bill Janssen]

Also, see this: https://github.com/matplotlib/matplotlib/issues/3439/

[Yoel Koenka]

Thanks Bill,

After finding this post, and looking at this example, I found a solution.

pyplt can be only imported after the matplotlib.use statement.

And in kivyagg is necessary for embedding the plot inside a kivy layout (I think)

import matplotlib
matplotlib.use("module://kivy.garden.matplotlib.backend_kivyagg")
from matplotlib import pyplot as plt
from kivy.garden.matplotlib import FigureCanvasKivyAgg

...
    self.fig = plt.gcf()
    self.add_widget(FigureCanvasKivyAgg(self.fig))

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[Bill Janssen]

Yes, that's a classic matplotlib gotcha.

Bill

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