Use prime symbol from bakoma

zblz · zblz · commit 8d7e98bb178a · 2015-10-29T18:59:40.000Z
see comments in matplotlib#4873 and matplotlib#4987: Primes in stix and DejaVu are already superscripted, so the TeX way of setting a prime as $f^\prime$ results in doubly-superscripted primes. For consistency with TeX, here we use the CM prime symbol.
diff --git a/lib/matplotlib/mathtext.py b/lib/matplotlib/mathtext.py
@@ -885,6 +885,7 @@ def get_sized_alternatives_for_symbol(self, fontname, sym):
                 fontname, sym)
         return [(fontname, sym)]
 
+
 class DejaVuFonts(UnicodeFonts):
     use_cmex = False
 
@@ -894,6 +895,7 @@ def __init__(self, *args, **kwargs):
             self.cm_fallback = StixFonts(*args, **kwargs)
         else:
             self.cm_fallback = StixSansFonts(*args, **kwargs)
+        self.bakoma = BakomaFonts(*args, **kwargs)
         TruetypeFonts.__init__(self, *args, **kwargs)
         self.fontmap = {}
         # Include Stix sized alternatives for glyphs
@@ -909,6 +911,16 @@ def __init__(self, *args, **kwargs):
             self.fontmap[key] = fullpath
             self.fontmap[name] = fullpath
 
+    def _get_glyph(self, fontname, font_class, sym, fontsize):
+        """ Override prime symbol to use Bakoma """
+        if sym == r'\prime':
+            return self.bakoma._get_glyph(fontname,
+                    font_class, sym, fontsize)
+        else:
+            return super(DejaVuFonts, self)._get_glyph(fontname,
+                    font_class, sym, fontsize)
+
+
 class DejaVuSerifFonts(DejaVuFonts):
     """
     A font handling class for the DejaVu Serif fonts
