Reduce Ps files sizes when using mathtext

mdboom · mdboom · commit fed68f8e5b5a · 2007-08-30T13:51:10.000Z
svn path=/trunk/matplotlib/; revision=3756
diff --git a/lib/matplotlib/mathtext.py b/lib/matplotlib/mathtext.py
@@ -315,19 +315,23 @@ def MathtextBackendAgg():
 class MathtextBackendPs(MathtextBackend):
     def __init__(self):
         self.pswriter = StringIO()
+        self.lastfont = None
 
     def render_glyph(self, ox, oy, info):
         oy = self.height - oy + info.offset
         postscript_name = info.postscript_name
         fontsize        = info.fontsize
         symbol_name     = info.symbol_name
 
-        # TODO: Optimize out the font changes
-        
-        ps = """/%(postscript_name)s findfont
+        if (postscript_name, fontsize) != self.lastfont:
+            ps = """/%(postscript_name)s findfont
 %(fontsize)s scalefont
 setfont
-%(ox)f %(oy)f moveto
+""" % locals()
+            self.lastfont = postscript_name, fontsize
+            self.pswriter.write(ps)
+        
+        ps = """%(ox)f %(oy)f moveto
 /%(symbol_name)s glyphshow\n
 """ % locals()
         self.pswriter.write(ps)
