Re: [matplotlib-devel] Qt backend

[Ted D. <ted...@jp...>]

Jody,
I have someone working on a Qt front end (using Agg for rendering).  He's 
only able to put in roughly 1 day/week and with the holidays coming up I'm 
not sure when it's going to be finished.  We're looking in to the 
possibility of being able to contribute this back to matplotlib (if John 
wants it) but there are legal issues on my end that need to get resolved 
before I'll know if it's possible.

FYI: If you want to render the output from graphviz, have you looked at 
dot?  The C/C++ tool doxygen uses graphviz/dot to render inheritance 
diagrams and place them in web pages (with click-able boxes no less).

Ted

At 11:15 AM 12/9/2004, Jody Winston wrote:
>John Hunter writes:
>  > >>>>> "Jody" == Jody Winston <jos...@ma...> writes:
>  >
>  >     Jody> Any pointers on either finding a Qt backend or writing one?
>  >     Jody> Thanks,
>  >
>  > Hi Jody,
>  >
>  > Sorry for the delay in getting back to you - I've been out of town for
>  > a week.
>  >
>  > There have been several people who have expressed interest in A QT
>  > backend - most recently Ted Drain at the JPL.  Perhaps you two could
>  > coordinate your efforts?
>
>I'd be happy to work with Ted.
>
>  > The first place to start is in the file
>  > matplotlib/backends/backend_template.py, which serves as a template
>  > for backend writers and gives some instructions.  I would follow the
>  > model of one of the *Agg backends, eg TkAgg, GTKAgg, FLTKAgg and
>  > WXAgg, which use Agg to render the image and place it in the GUI
>  > canvas.  This is a lot less work and you automiatically get the latest
>  > matplotlib feature set for free.  The basic idea is to use a GUI
>  > independent image library that can then be reused across GUIs.
>  >
>  > The backends have to implement concrete versions of several interface
>  > classes: RendererBase, GraphicsContextBase, FigureCanvasBase,
>  > FigureManagerBase, NavigationToolbar2.  If you opt to use Agg (or
>  > Cairo) to do the drawing for you, you can leave out RendererBase and
>  > GraphicsContextBase, which are the two that require the most work.
>
>I've also built a SWIG interface for Cairo so that I can embed it in a
>Qt application.
>
>The real reason that I am working on Cairo and matplotlib is that I
>want a portable way to display output from ATT's graphviz.  From my
>quick look through matplotlib's code, it looks like this may be hard
>to do.  So, if I continue this project, I'll also be asking how to
>render ploygons, ellipses, and text.  Do you think that matplotlib is
>a good fit given my requirements?
>
>
>
>
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Ted Drain     Jet Propulsion Laboratory   ted...@jp...