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

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

Indeed, there are some oddities, but mostly with regards to Qt and forcing
it to build and link against (presumedly) the conda package of it. There is
a modification of the setupext.py that happens at build time to replace all
instances of "/usr/local" with "$PREFIX". Perhaps what is happening is that
my local builds of matplotlib is compiling and linking against my system
install of the tk/tcl headers and libraries, and that might be conflicting
with the conda-shipped tk/tcl packages?

I'll have to experiment a bit more tonight. Thanks for the suggestion!

Ben Root

On Mon, Nov 17, 2014 at 11:07 PM, Thomas Caswell <tca...@gm...> wrote:

> Have a look at the recipe in conda-rescipes for matplotlib, they might be
> doing some funny patching.
>
> On Mon, Nov 17, 2014, 22:48 Benjamin Root <ben...@ou...> wrote:
>
>> 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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