Re: [Matplotlib-users] Using helvetica latex fonts...

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

>>>>> "Fernando" == Fernando Perez <Fer...@co...> writes:

    Fernando> In [23]: p mp.value figure() plot([1,2,3]) title(r'Hello
    Fernando> matplotlib: $x=1+\alpha')

I assume you have another dollar sign in there in real life?

    Fernando> Running it any number of times, all the while changing
    Fernando> this:

    Fernando> In [28]: rc('font.latex',package='times')

    Fernando> to 'times', 'helvetica', etc, produces no change in the
    Fernando> generated picture.  Is this setting supposed to be
    Fernando> ignored?  I see that

    Fernando> http://www.scipy.org/wikis/topical_software/UsingTex

    Fernando> mentions that these parameters can be changed 'before
    Fernando> importing pylab'.  Any reason why they can't be reset on
    Fernando> the fly?

No, you should be able to change them on the fly.  It turns out that
agg is also doing some caching of the generated images, and this is
where the problem was (there was also one in texmanager that I fixed
yesterday).  I just committed some changes that are untested but
should work.  FYI, the relevant bits of the code are texmanager's
get_prefix and backend_agg's draw_tex functions.  Previously in agg I
was caching on

        key = s, size, dpi, rgb, angle

and I added the rc info to the key

        key = s, size, dpi, rgb, angle, rcParams['font.latex'],rcParams['text.tex.engine']


    Fernando> AND, even worse, I'm getting consistently that if I
    Fernando> select

    Fernando> font.latex.package : helvetica

    Fernando> produces a nasty error (I can send the full tb if
    Fernando> needed):

    Fernando> RuntimeError: _image_module::readpng could not open PNG
    Fernando> file
    Fernando> /home/fperez/.matplotlib/tex.cache/4c6661ae3b1f9211424cf72e05973891_120.png
    Fernando> for reading

Flush the cache and reinstall from CVS and make sure you can repeat
this error after the newest fixes (probably still there but worth a
try).  If so inspect the pointed to PNG file and see what is going on
with it: does it exist, does it have data in it, is it in fact a
readable png?

Cheers,
JDH