Re: [matplotlib-devel] tk backend broken (somehow?)

[Benjamin R. <ben...@ou...>]

Ok, I am just really confused now. I have confirmed that using the
matplotlib supplied by miniconda (v1.4.2) works just fine. Ripping that out
and building version 1.4.2 from source results in the traceback. Same thing
for v1.3.1. I have even tried checking out PR#3811 which addresses the
weird constructor issues we found today, and I still get the segfault.

Maybe I should try getting out of the conda environment entirely and try
EPD instead to see if that makes a difference?

Ben Root

On Mon, Nov 17, 2014 at 5:17 AM, Phil Elson <pel...@gm...> wrote:

> Mike made some changes to this recently.
> https://github.com/matplotlib/matplotlib/pull/3778
>
> May be the cause.
>
> On 16 November 2014 18:12, Benjamin Root <ben...@ou...> wrote:
>
>> And with my continuing saga of backend-specific things...
>>
>> I was using conda, but because it does not ship with pygtk support, I had
>> to manually install pygtk into the conda environment and then install
>> matplotlib from source. All that seemed to work fine when I worked on Wx
>> and Gtk examples for my book.
>>
>> I went back to a (previously working) Tk example to polish it, and I get
>> all sorts of errors now. I have tried multiple releases of matplotlib from
>> source (doing a git clean -fxd between them), all with similar errors. In
>> fact, with master, the error causes a segfault:
>>
>> ben@tigger:~/Documents/InteractiveMPL$ python chp5/slider_tk.py
>> Exception in Tkinter callback
>> Traceback (most recent call last):
>>   File "/home/ben/miniconda/lib/python2.7/lib-tk/Tkinter.py", line 1486,
>> in __call__
>>     return self.func(*args)
>>   File
>> "/home/ben/miniconda/lib/python2.7/site-packages/matplotlib-1.5.x-py2.7-linux-x86_64.egg/matplotlib/backends/backend_tkagg.py",
>> line 278, in resize
>>     self.show()
>>   File
>> "/home/ben/miniconda/lib/python2.7/site-packages/matplotlib-1.5.x-py2.7-linux-x86_64.egg/matplotlib/backends/backend_tkagg.py",
>> line 350, in draw
>>     tkagg.blit(self._tkphoto, self.renderer._renderer, colormode=2)
>>   File
>> "/home/ben/miniconda/lib/python2.7/site-packages/matplotlib-1.5.x-py2.7-linux-x86_64.egg/matplotlib/backends/tkagg.py",
>> line 30, in blit
>>     id(data), colormode, id(bbox_array))
>> TclError
>> alloc: invalid block: 0x2cfe3b0: 0 0
>> Aborted (core dumped)
>>
>> The line in question is (at least in v1.3.1, it is slightly different in
>> more recent versions):
>> tk.call("PyAggImagePhoto", photoimage, id(aggimage), colormode,
>> id(bbox_array))
>>
>> This happens regardless of what example I use (my own or otherwise).
>> There is no blit-specific code in the examples. All of this worked with the
>> conda-supplied matplotlib, but never the
>> from-source-into-a-conda-environment install.
>>
>> Thoughts?
>> Ben Root
>>
>>
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>