matplotlib-users

[Matplotlib-users] Using matplotlib OO rather than the pylab functions to save graphic context (fig

[Philippe C. <phi...@ho...>]

Hi list,

I'm under windows XP SP2 using python 2.3.5, matplotlib 0.80 and pygtk 
2.6.0.
I'm trying to program a viewer of data using matplotlib.
I want to be able to save end reuse current graphic context (figure, title, 
axes, labels...).
I decided to explore the matplotlib code.
But I'm not sure how i can get the current figure.

I want to be able to save the current graphic context, draw a figure, then 
reload other data and add them to the current figure already drawn.

Has anyone done that before?
John, can you explain me how to proceed?

Thanks a lot,
Philippe Collet

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Re: [Matplotlib-users] Using matplotlib OO rather than the pylab functions to save graphic context (fig

[Tim L. <ti...@cs...>]

On Wed, 15 Jun 2005, Philippe Collet <phi...@ho...> wrote...

> Hi list,
> 
> I'm under windows XP SP2 using python 2.3.5, matplotlib 0.80 and pygtk 
> 2.6.0.
> I'm trying to program a viewer of data using matplotlib.
> I want to be able to save end reuse current graphic context (figure, title, 
> axes, labels...).
> I decided to explore the matplotlib code.
> But I'm not sure how i can get the current figure.
> 
> I want to be able to save the current graphic context, draw a figure, then 
> reload other data and add them to the current figure already drawn.
> 
> Has anyone done that before?
> John, can you explain me how to proceed?

A good place to start to get a feel for how to do this kind of thing is to
look in the examples directory of the source tree. In particular the
embedding_in_* ones may be of interest to you.

Feel free to get back to us if this doesn't give a good enough starting
point.

Cheers,

Tim

> 
> Thanks a lot,
> Philippe Collet
> 
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Re: [Matplotlib-users] Using matplotlib OO rather than the pylab functions to save graphic context (fig

[John H. <jdh...@ac...>]

>>>>> "Philippe" == Philippe Collet <phi...@ho...> writes:

    Philippe> Hi list, I'm under windows XP SP2 using python 2.3.5,
    Philippe> matplotlib 0.80 and pygtk 2.6.0.  I'm trying to program
    Philippe> a viewer of data using matplotlib.  I want to be able to
    Philippe> save end reuse current graphic context (figure, title,

There is some tutorial information on using OO mpl at
http://matplotlib.sourceforge.net/faq.html#OO

    Philippe> axes, labels...).  I decided to explore the matplotlib
    Philippe> code.  But I'm not sure how i can get the current
    Philippe> figure.

Exploring the code is always a good way to start, as is reading the
class documentation for the classes you are working with, eg,
http://matplotlib.sourceforge.net/classdocs.html

Note that the concept of "the current figure" does not exist in the OO
API -- this is a pylab construct.  You create a figure with 

  fig = Figure(args...)

and then it is your responsibility to save it and use it where you
want, eg in as a class variable

  self.fig = Figure(args...)

    Philippe> I want to be able to save the current graphic context,
    Philippe> draw a figure, then reload other data and add them to
    Philippe> the current figure already drawn.


    Philippe> Has anyone done that before?  John, can you explain me
    Philippe> how to proceed?

This sounds eminently doable -- try writing some example code and if
you get stuck post the code and a description of what you are trying
to do and we can help out.

JDH