Added some logic to Axes.bar that will preconvert unitized data before creating

the rectangular Patch since not all unitized data can be subtracted with a floating
point number (ie. 'left - width') this is especially true with 'time' (time - time = duration).
This problem can be seen when passing in a floating-point number for the width, which
in-turn should be interpreted to be a number in the units for the axis.  This was not
being done, and now is.  There is probably a better way to handle this.

svn path=/trunk/matplotlib/; revision=4811

Author: James Evans

lib/matplotlib/axes.py

@@ -3264,6 +3264,20 @@ def make_iterable(x):
 
         patches = []
 
+        # lets do some conversions now since some types cannot be subtracted uniformly
+        if self.xaxis is not None:
+            xconv = self.xaxis.converter
+            if xconv is not None:
+                units = self.xaxis.get_units()
+                left = xconv.convert( left, units )
+                width = xconv.convert( width, units )
+
+        if self.yaxis is not None:
+            yconv = self.yaxis.converter
+            if yconv is not None :
+                units = self.yaxis.get_units()
+                bottom = yconv.convert( bottom, units )
+                height = yconv.convert( height, units )
 
         if align == 'edge':
             pass