Don't create minor ticks on top of existing major ticks (Neil Crighton).

svn path=/trunk/matplotlib/; revision=8083

Author: astraw

CHANGELOG

@@ -1,3 +1,6 @@
+2009-01-16 Don't create minor ticks on top of existing major
+           ticks. Patch by Neil Crighton. -ADS
+
 2009-01-16 Ensure three minor ticks always drawn (SF# 2924245). Patch
            by Neil Crighton. -ADS
 

lib/matplotlib/ticker.py

@@ -1334,8 +1334,13 @@ def __call__(self):
         vmin, vmax = self.axis.get_view_interval()
         if vmin > vmax:
             vmin,vmax = vmax,vmin
+        locs = locs[(vmin < locs) & (locs < vmax)]
 
-        return self.raise_if_exceeds(locs[(vmin < locs) & (locs < vmax)])
+        # don't create minor ticks on top of existing major ticks
+        diff = 0.5 * abs(locs[1] - locs[0])
+        locs = [l for l in locs if (np.abs(l - majorlocs) > diff).all()]
+
+        return self.raise_if_exceeds(np.array(locs))
 
 
 class OldAutoLocator(Locator):