Test font styling support in matplotlib (#788)

font_styles.py

import matplotlib
matplotlib.use("Agg")

from matplotlib import _get_data_path
data_path = _get_data_path()

def find_matplotlib_font(**kw):
    prop = FontProperties(**kw)
    path = findfont(prop, directory=data_path)
    return FontProperties(fname=path)

from matplotlib.font_manager import FontProperties, findfont
import matplotlib.pyplot as plt

fig = plt.figure()
ax = plt.subplot( 1, 1, 1 )

normalFont = find_matplotlib_font( family = "sans-serif",
                                   style = "normal",
                                   variant = "normal",
                                   size = 14,
                                   )
ax.annotate( "Normal Font", (0.1, 0.1), xycoords='axes fraction',
              fontproperties = normalFont )

boldFont = find_matplotlib_font( family = "Foo",
                                 style = "normal",
                                 variant = "normal",
                                 weight = "bold",
                                 stretch = 500,
                                 size = 14,
                                 )
ax.annotate( "Bold Font", (0.1, 0.2), xycoords='axes fraction',
              fontproperties = boldFont )

boldItemFont = find_matplotlib_font( family = "sans serif",
                                     style = "italic",
                                     variant = "normal",
                                     weight = 750,
                                     stretch = 500,
                                     size = 14,
                                     )
ax.annotate( "Bold Italic Font", (0.1, 0.3), xycoords='axes fraction',
              fontproperties = boldItemFont )

lightFont = find_matplotlib_font( family = "sans-serif",
                                  style = "normal",
                                  variant = "normal",
                                  weight = 200,
                                  stretch = 500,
                                  size = 14,
                                  )
ax.annotate( "Light Font", (0.1, 0.4), xycoords='axes fraction',
              fontproperties = lightFont )

condensedFont = find_matplotlib_font( family = "sans-serif",
                                      style = "normal",
                                      variant = "normal",
                                      weight = 500,
                                      stretch = 100,
                                      size = 14,
                                      )
ax.annotate( "Condensed Font", (0.1, 0.5), xycoords='axes fraction',
              fontproperties = condensedFont )

ax.set_xticks([])
ax.set_yticks([])

fig.savefig("test.png")