Fix position of rotated text in Agg backend

Author: mdboom

lib/matplotlib/backends/backend_agg.py

@@ -180,7 +180,7 @@ 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
-        xd = d * np.sin(np.deg2rad(angle))
+        xd = -d * np.sin(np.deg2rad(angle))
         yd = d * np.cos(np.deg2rad(angle))
 
         #print x, y, int(x), int(y), s