Add proper handling of tikz/pgf files

[mpastell]

Add proper handling of tikz/pgf files

[mpastell]

You can set matplotlib to use pgf as backend for pdf files using a hidden chunk in the start of the document if you want. I will look into adding it as optional format as well. It looks like the currently used "agg" backend doesn't support unicode so in order to get full support one would need to set pgf as backend.

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import matplotlib
from matplotlib.backends.backend_pgf import FigureCanvasPgf
matplotlib.backend_bases.register_backend('pdf', FigureCanvasPgf)

from matplotlib.externals import six
import matplotlib as mpl

pgf_with_custom_preamble = {
    "font.family": "serif", # use serif/main font for text elements
    "text.usetex": True,    # use inline math for ticks
    "pgf.rcfonts": False,   # don't setup fonts from rc parameters
    "pgf.preamble": [
         "\\usepackage{units}",         # load additional packages
         "\\usepackage{metalogo}",
         "\\usepackage{unicode-math}",  # unicode math setup
         r"\setmathfont{xits-math.otf}",
         r"\setmainfont{DejaVu Serif}", # serif font via preamble
         ]
}
mpl.rcParams.update(pgf_with_custom_preamble)
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