Re: [matplotlib-devel] [Matplotlib-users] Problem with cachedRenderer

[Tony Yu <ts...@gm...>]

On Wed, Jan 25, 2012 at 7:14 AM, andi <and...@go...> wrote:

>  Hi Tony,
>
> thanks for your reply! I am not using the pdf backend, but the GTKAgg
> backend. Is it working with this backend in the development version?
>
> Cheers
> Andi
>

Hi Andi,

Unfortunately, I can't run the GTKAgg backend, but I checked your code
snippet on the backends I have on my system. It seems this behavior is
really inconsistent:

Works:
* agg
* qt4agg
* tkagg

Doesn't work:
* pdf
* macosx

To be honest, I don't understand the magical workings of the backends very
well. I've copied the developer list since the consistency of backends
seems like a relevant issue.

-Tony

P.S. Andi: Be sure to "reply all" since the mailing list doesn't
automatically do this for some reason.


>
> On 25/01/12 00:26, Tony Yu wrote:
>
>
>
> On Tue, Jan 24, 2012 at 12:53 PM, andi <and...@go...> wrote:
>
>> Hi all,
>>
>> I have some old custom code for generating videos from matplotlib (not
>> using the animation module). It used to work, but is now failing.
>> Here is what I am doing:
>>
>> -------------------
>> import matplotlib.pyplot as plt
>> import numpy as np
>>
>> fig = plt.figure()
>> ax = fig.add_subplot(111)
>> im = ax.imshow(np.zeros((100, 100)))
>> fig.canvas.draw()
>> ax.draw_artist(im)
>> ------------------
>>
>> ... and draw_artist from axes.py then gives me an AssertionError because
>> no renderer is found (assert self._cachedRenderer is not None).
>>
>> Right now I am using matplotlib 1.0.1 and I think that the above used to
>> work with older versions in matplotlib. See e.g.
>>
>> http://www.mail-archive.com/mat...@li.../msg06598.html
>>
>> Any ideas?
>>
>> Cheers
>> Andi
>>
>>
> Hi Andi,
>
> I'm running a development version of matplotlib, and your code runs
> without issue. That doesn't really solve your issue, but it means that it's
> not due to deprecation.
>
> On a hunch, I tried running the code with
> >>> import matplotlib
> >>> matplotlib.use('pdf')
> at the top of the file, and I got the same error. Not really sure why,
> though. Do you happen to have the pdf backend set as the default?
>
> -Tony
>
>