Stan West wrote:
> I've not studied or used the CallbackRegistry, so I've got nothing to add on
> that front. However, may I submit the attached work-around for Axes.cla?
> Instead of offsetting the title using Affine2D().translate( ... figure.dpi
> ... ), it uses ScaledTranslation( ... figure.dpi_scale_trans ...). This
> way, it seems to require no connection to the dpi_changed event (thereby
> sidestepping the callback accumulation). Also, it constructs
> titleOffsetTrans similarly to get_xaxis_text1_transform and its relatives,
> and it reduces the hard-coded 5-point offset from three occurences to one,
> which helps any future conversion to an rcParam.
>
I think that's a great solution. I actually thought of it right after
writing the last e-mail, but got onto other things. It's nice to see
that someone else has picked up on the new transformations infrastructure.
> I verified that the old and new code produce the same transformation matrix.
> However, when I tried to retrieve the title's transformation, I received a
> rather long traceback. It can be reproduced with
>
> import matplotlib.transforms as mtransforms
> mtransforms.ScaledTranslation(0, 0, mtransforms.IdentityTransform())
>
> under 0.98.0. Now, how far have we deviated from the subject line? :-)
>
You just mean when you try to print the transformation out, right?
There is a missing comma in the ScaledTranslation.__repr__:
def __repr__(self):
return "ScaledTranslation(%s)" % (self._t,)
I've fixed both of these things on the trunk. Thanks for looking into this.
As for the callbacks accumulating, I realize we've fixed this instance
of that, but I'm going to file a bug recommending that we revisit the
CallbackRegistry class so it doesn't get lost.
Cheers,
Mike
>
> -----Original Message-----
> From: Michael Droettboom [mailto:[EMAIL PROTECTED]
> Sent: Friday, June 06, 2008 10:10
> To: Stan West
> Cc: 'John Hunter'; 'matplotlib-dev list'
> Subject: Re: [matplotlib-devel] RegularPolyCollection inputs
> incollections_demo.py are wrong?
>
> You're absolutely right that it needs to be fixed.
>
> However, I wonder why the CallbackRegistry doesn't just store the callbacks
> in a set (or keys of a dictionary) such that multiple adds of the exact same
> function or method to the same signal couldn't occur.
> Since there is no external state stored with each callback, I don't see a
> need for there ever being more than one of the same thing in there...
> but maybe I'm missing something. Additionally, it seems like a C-ism to
> have to deal with callback ids when the callback objects themselves are
> already hashable and could be used to remove themselves.
>
> Cheers,
> Mike
>
> Stan West wrote:
>
>> Quoting John Hunter:
>>
>>
>>
>>> Alternatively you can connect to the figure dpi_changed event --
>>> there is an example in Axes.cla
>>>
>>>
>> Regarding that example, each call to Axes.cla connects a new
>> dpi_changed callback, but, as far as I can tell, the callback is never
>>
> disconnected.
>
>> Thus, each cla call augments the dict of dpi_changed figure callbacks:
>>
>> fig = figure()
>> ax = fig.add_subplot(1, 1, 1)
>> print len(fig.callbacks.callbacks['dpi_changed']) # only 1
>> for n in range(7): ax.cla()
>> print len(fig.callbacks.callbacks['dpi_changed']) # now 8
>>
>> Should cla store the connection id and, if there is a stored id from a
>> prior call, disconnect the previous callback before connecting the new
>>
> one?
>
>> Stan
>>
>>
>>
>>
>
> --
> Michael Droettboom
> Science Software Branch
> Operations and Engineering Division
> Space Telescope Science Institute
> Operated by AURA for NASA
>
>
--
Michael Droettboom
Science Software Branch
Operations and Engineering Division
Space Telescope Science Institute
Operated by AURA for NASA
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