Re: [Matplotlib-users] fonts for log axis?

[Arnd B. <arn...@we...>]

Hi John,

On Sat, 3 Sep 2005, John Hunter wrote:

> >>>>> "arnd" == arnd baecker <arn...@we...> writes:
>     arnd> the y-axis has a different font (italic) than the x-axis
>     arnd> (sans-serif).  Looking at the code, this is because it is
>     arnd> set as math text ($ ...$).  Is there a trick to ensure a
>     arnd> sans-serif font for the y-axis?  (I would like to use
>     arnd> matplotlib plots in a presentation and sans-serif fonts are
>     arnd> better suited for this.)
>
> What version of mpl are you using?  I thought in a previous post you
> said you were using cvs (could be mistaken).

You remember the version I am running better than I do ;-).
In [1]: import matplotlib
In [2]: matplotlib.__version__
Out[2]: '0.84.cvs.2'

> I wrote an extension to
> text.py to special case exponential formatting specifically to solve
> the mismatched fonts problem.  So make sure you are using a current
> problem of matplotlib and if you still have the problem check your
> input against the regex in matplotlib.text.Text
>
>     # special case superscripting to speedup logplots
>     _rgxsuper = re.compile('\$([\-+0-9]+)\^\{(-?[0-9]+)\}\$')
>
> If you can fix up this expression to include your case that would be
> most helpful.

I think the expression is alright:
I looked at matplotlib/text.py - class Text. It seems that
for this example the routine does not pass by the
first use of self._rgxsuper:


	print "Arriving here1"
        if angle==0:
	    print "Arriving here2"
            if ismath!='TeX':            # <==== change to "==" here?
		print "Arriving here3"
 		m = None
            else:
                m = self._rgxsuper.match(self._text)
		print "passing by here..."
	    print "Arriving here4"
            if m is not None and not rcParams['text.usetex']:
		print "Arriving here5"
                bbox, info = self._get_layout_super(self._renderer, m)
                base, xt, yt = info[0]
                renderer.draw_text(gc, xt, yt, base,
                                   self._fontproperties, angle,
                                   ismath=False)

                exponent, xt, yt, fp = info[1]
                renderer.draw_text(gc, xt, yt, exponent,
                                   fp, angle,
                                   ismath=False)
                return

However, changing ismath!='TeX' to ismath=='TeX'
seems to work (for this particular example): I.e. I get
the non-math fonts on the vertical axis.
Can you confirm that this change is the correct solution?

Best,

Arnd

P.S.: BTW: splattering the prints around seems like poor-mans
debugging ;-) Are there better solutions available?