Re: [matplotlib-devel] SpanSelector with gtk3cairo backend

I should point out that the animation module tries to determine if the
canvas can blit if the user sets it to True. If it can't blit, then it
simply ignores the True setting. Maybe we should do something similar like
here as well?

On Tue, Nov 11, 2014 at 4:50 PM, Arnaud Gardelein <ar...@os...> wrote:

> Le mardi 11 novembre 2014 à 08:56 +0000, Jens Nielsen a écrit :
> > There was an issue with the GTK3Agg backend on Python 3 due to a
> > missing feature in the python 3 port of PyCairo but this has been
> > fixed in Matplotlib 1.4.0 by making it possible to use cairocffi as an
> > alternative to PyCairo.
> This is exactly the issue I meant.
>
> (...)
>
> > On Mon, Nov 10, 2014 at 11:26 PM, Thomas Caswell <tca...@gm...>
> > wrote:
> (...)
> >         The issue is that the cairo backend is a vector backend, which
> >         does not have a notion of blitting, which is something that
> >         span selector uses to make it nice and snappy.  Should be able
> >         to get it to work by passing the kwarg `useblit=False` to the
> >         constructor.
> >
> >         Tom
>
> In fact I stupidly copied the example [1], missing completely this
> argument in the constructor. Setting useblit=False makes it working
> nicely. Thanks.
>
> Arnaud.
>
> [1] http://matplotlib.org/examples/widgets/span_selector.html
>
> PS: For the records, here is the full message that appears when setting
> useblit=True in [1] and matplotlibrc contains "backend : GTK3Cairo",
> matplotlib version 1.4.2 (debian):
>
> $ ./testspan.py
> Traceback (most recent call last):
>   File
> "/usr/lib/python3/dist-packages/matplotlib/backends/backend_gtk3cairo.py",
> line 45, in on_draw_event
>     self._render_figure(w, h)
>   File
> "/usr/lib/python3/dist-packages/matplotlib/backends/backend_gtk3cairo.py",
> line 34, in _render_figure
>     self.figure.draw (self._renderer)
>   File "/usr/lib/python3/dist-packages/matplotlib/artist.py", line 59,
> in draw_wrapper
>     draw(artist, renderer, *args, **kwargs)
>   File "/usr/lib/python3/dist-packages/matplotlib/figure.py", line 1085,
> in draw
>     self.canvas.draw_event(renderer)
>   File "/usr/lib/python3/dist-packages/matplotlib/backend_bases.py",
> line 1778, in draw_event
>     self.callbacks.process(s, event)
>   File "/usr/lib/python3/dist-packages/matplotlib/cbook.py", line 540,
> in process
>     proxy(*args, **kwargs)
>   File "/usr/lib/python3/dist-packages/matplotlib/cbook.py", line 415,
> in __call__
>     return mtd(*args, **kwargs)
>   File "/usr/lib/python3/dist-packages/matplotlib/widgets.py", line
> 1197, in update_background
>     self.background = self.canvas.copy_from_bbox(self.ax.bbox)
> AttributeError: 'FigureCanvasGTK3Cairo' object has no attribute
> 'copy_from_bbox'
>
>
>
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