Update usetex_fonteffects example.

anntzer · anntzer · commit ed47b8ba5a2a · 2020-02-26T19:24:23.000+01:00
- Use Figure.text() / Figure.suptitle() instead of adding text to an
  Axes and then going through the bother of setting the axes limits and
  then hiding the axes.
- Explicitly pass usetex=True to the sole text() call instead of using
  rc().
- Show the figure, demonstrating that things work in agg as well,
  instead of creating a pdf file that then needs to be cleaned out of
  the source tree (but mention that saving to pdf works too).
- fstringify.
diff --git a/examples/text_labels_and_annotations/usetex_fonteffects.py b/examples/text_labels_and_annotations/usetex_fonteffects.py
@@ -4,28 +4,25 @@
 ==================
 
 This script demonstrates that font effects specified in your pdftex.map
-are now supported in pdf usetex.
+are now supported in usetex mode.
 """
 
-import matplotlib
 import matplotlib.pyplot as plt
-matplotlib.rc('text', usetex=True)
 
 
 def setfont(font):
-    return r'\font\a %s at 14pt\a ' % font
+    return rf'\font\a {font} at 14pt\a '
 
 
+fig = plt.figure()
 for y, font, text in zip(range(5),
                          ['ptmr8r', 'ptmri8r', 'ptmro8r',
                           'ptmr8rn', 'ptmrr8re'],
                          ['Nimbus Roman No9 L ' + x for x in
                           ['', 'Italics (real italics for comparison)',
                            '(slanted)', '(condensed)', '(extended)']]):
-    plt.text(0, y, setfont(font) + text)
+    fig.text(.1, (y + 1) / 6, setfont(font) + text, usetex=True)
 
-plt.ylim(-1, 5)
-plt.xlim(-0.2, 0.6)
-plt.setp(plt.gca(), frame_on=False, xticks=(), yticks=())
-plt.title('Usetex font effects')
-plt.savefig('usetex_fonteffects.pdf')
+fig.suptitle('Usetex font effects')
+# Would also work if saving to pdf.
+plt.show()
