Fix buglet in get_text_width_height_descent of backend_agg

jkseppan · jkseppan · commit b74c08b84453 · 2007-09-03T16:29:08.000Z
when text.usetex is in effect. The descent returned is probably 
not correct, but it should be similar to the one returned by
backend_ps.

svn path=/trunk/matplotlib/; revision=3768
diff --git a/lib/matplotlib/backends/backend_agg.py b/lib/matplotlib/backends/backend_agg.py
@@ -228,7 +228,8 @@ def get_text_width_height_descent(self, s, prop, ismath, rgb=(0,0,0)):
             texmanager = self.get_texmanager()
             Z = texmanager.get_rgba(s, size, self.dpi.get(), rgb)
             m,n,tmp = Z.shape
-            return n,m
+            # TODO: descent of TeX text (I am imitating backend_ps here -JKS)
+            return n, m, m
 
         if ismath:
             ox, oy, width, height, descent, fonts, used_characters = \
