Merge pull request matplotlib#4031 from mdboom/font-advance-width

API : Font advance width

This resets _all_ of the images with text.

Author: tacaswell

CHANGELOG

@@ -1,3 +1,6 @@
+2015-01-23 Text bounding boxes are now computed with advance width rather than
+  	   ink area.  This may result in slightly different placement of text.
+
 2014-10-27 Allowed selection of the backend using the `MPLBACKEND` environment
            variable. Added documentation on backend selection methods.
 

lib/matplotlib/backends/backend_agg.py

@@ -202,12 +202,15 @@ def draw_text(self, gc, x, y, s, prop, angle, ismath=False, mtext=None):
         font.draw_glyphs_to_bitmap(antialiased=rcParams['text.antialiased'])
         d = font.get_descent() / 64.0
         # The descent needs to be adjusted for the angle
+        xo, yo = font.get_bitmap_offset()
+        xo /= 64.0
+        yo /= 64.0
         xd = -d * np.sin(np.deg2rad(angle))
         yd = d * np.cos(np.deg2rad(angle))
 
         #print x, y, int(x), int(y), s
         self._renderer.draw_text_image(
-            font, np.round(x - xd), np.round(y + yd) + 1, angle, gc)
+            font, np.round(x - xd + xo), np.round(y + yd + yo) + 1, angle, gc)
 
     def get_text_width_height_descent(self, s, prop, ismath):
         """