Re: [Matplotlib-users] Math Figure

[Jeremy O'D. <je...@o-...>]

Hi John,

I'm (slowly) getting around to doing all of the things needed to bring
backend_wx up to date (as far as possible). backend_wxagg will arrive, bu=
t
I'm trying to get some other things into backend_wx first, specifically:

- Support for images (which is turning out to be trickier than I thought)
- Support for the object picker (which should be easy)
- Support Mathtext

The problem of Mathtext support is a superset of the image support proble=
m.

The approach which I'm looking at is to use wxImage, which has a fast
method for loading data (wxImage.SetData()) - ths expects a C string of
length width*height*3 (in format RGBRGBRGB...).

Not sure what format im.as_str() returns as I can't find any documentatio=
n
(the im parameter to RendererWx.draw_image() is an instance of
matplotlib.image, I assume), so I'm stuck (or was a couple of nights ago)=
.

As you say, writing wxAgg is really pretty straightforward, and it's on m=
y
(ever lengthening) ToDo list... At the moment I don't have anything in a
usable state.

Regards

Jeremy

John Hunter said:
>>>>>> "Flavio" =3D=3D Flavio Codeco Coelho <fcc...@ci...>
>>>>>> writes:
>
>     Flavio> Hi, I use matplotlib for a math modelling software.
>
>     Flavio> I would like to create a figure, using the mathtext
>     Flavio> module, that would consist entirely of a list of
>     Flavio> equations.
>
>     Flavio> This figure would be embedded in WX.
>
>     Flavio> can anyone give me some pointer on how to get started?
>
> First port mathtext to wx <wink>.  There are two ways to do this:
>
>   * Write WXAgg:  This is easier than you think.
>
>   * Use the image_as_str method that ft2font provides to get a pixel
>     array from the math fonts and transfer them to the wx canvas using
>     the wx API.  Something like draw_from_rgba.  I don't know WX very
>     well.  Is there a WX method that allows you to draw from a
>     character buffer or array?
>
> Jeremy earlier expressed some interest in WXAgg but I don't know what
> the current status of that is.
>
> After that is done, we can move on to your question.  Hint: see
> examples/alignment_test.py for examples of laying out just text using
> 0,1 coords.
>
> JDH
>