[Matplotlib-users] Re: (Matplotlib-users) Matplotlib qt backend?

[Nicolas D. <du...@dr...>]

Hi,

Looking at the Matplotlib Mailing list, I wonder if you=20
already started working in this direction?

Nicolas


Le Jeudi 19 Ao=FBt 2004 13:58, John Hunter a =E9crit=A0:
> >>>>> "Sigve" =3D=3D Sigve Tjora <pu...@tj...> writes:
>
>     Sigve> Hi everyone, Is there any planned support for
> a Qt-backend? Sigve> We are using Qt in our project, and
> I would like to use Sigve> Matplot lib for plotting.
>
>     Sigve> If there is not any support for Qt how hard
> would it be to Sigve> make it myself? Would it be best to
> base it on the Agg Sigve> backend, or should I make a
> native Qt backend? What is the Sigve> least work? Is it
> possible to write the whole backend in Sigve> Python or
> should I use C++ in addition?
>
> Currently there is no QT backend, or one in the works,
> but it would be nice.  It is definitely much easier to
> base it on the agg backend and is in fact *strongly
> encouraged* as that minimizes the amount of maintenance
> required.
>
> Using C/C++ is an optional step.  TkAgg and GTKAgg use it
> to get the optimal transfer speed from the agg image to
> the GUI canvas.  WXAgg and FLTKAgg do not use it, and
> Gregory reports great performance for FLTKAgg.  WXAgg
> uses string methods to transfer the image and FLTKAgg
> uses a python buffer object.  I encourage you to try and
> use a python buffer object (or string method) as opposed
> to extension code in the beginning since it's easier to
> write and maintain, it will introduce no extra compile
> time dependencies, and in the event that you find it too
> slow and want to write an extension to speed things up,
> you'll have the pure python method to fall back on for
> users who can't get the extension compiled.
>
> matplotlib.backends.backend_template contains the basic
> documentation for backend writers.  But this code does a
> lot more than you need, since agg will be doing the
> drawing; ie you don't need to implement a renderer or
> graphics context.  I recommend you give it a read
> through, and then follow the lead of backend_fltkagg.  I
> also advise you not to implement the classic navigation
> toolbar (at least not until later) because the new
> toolbar design is not only better (in my opinion), it's
> currently the default and most importantly, is much
> easier to implement since all the work is done for you in
> backend bases.  You basically need to load up some images
> into a toolbar and get the signal connections right.
>
> In the event you need a different pixel format to
> transfer the agg image to the qt canvas, that will be no
> problem.  I will be glad to add it for you or you can add
> it yourself to backend_agg.
>
> The only thing I ask of submitters is that if you want
> your backend to be included with the matplotlib
> distribution, please be responsible for testing it across
> the major platforms the GUI should run on (eg linux,
> win32, and OSX), provide some install instructions,
> version dependencies, etc, for the documentation, and
> monitor the mailing lists to handle questions about your
> backend.  In a nutshell, I need you to maintain it.  If
> you don't have the time to maintain it but want to write
> one anyway for your own work, I would be happy to provide
> a link to it with a disclaimer that users are on their
> own.
>
> Good luck if you decide to do it, and let me know if I
> can help.
>
> JDH
>
>
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>sers

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