Merge pull request matplotlib#1114 from dmcdougall/alpha

Make grid accept alpha rcParam

Author: mdboom

lib/matplotlib/axis.py

@@ -412,6 +412,7 @@ def _get_gridline(self):
                    color=rcParams['grid.color'],
                    linestyle=rcParams['grid.linestyle'],
                    linewidth=rcParams['grid.linewidth'],
+                   alpha=rcParams['grid.alpha'],
                    )
         l.set_transform(self.axes.get_xaxis_transform(which='grid'))
         l.get_path()._interpolation_steps = GRIDLINE_INTERPOLATION_STEPS
@@ -550,6 +551,7 @@ def _get_gridline(self):
                     color=rcParams['grid.color'],
                     linestyle=rcParams['grid.linestyle'],
                     linewidth=rcParams['grid.linewidth'],
+                    alpha=rcParams['grid.alpha'],
                     )
 
         l.set_transform(self.axes.get_yaxis_transform(which='grid'))

lib/matplotlib/rcsetup.py

@@ -539,6 +539,7 @@ def __call__(self, s):
     'grid.color'       : ['k', validate_color],       # grid color
     'grid.linestyle'   : [':', str],       # dotted
     'grid.linewidth'   : [0.5, validate_float],     # in points
+    'grid.alpha'       : [1.0, validate_float],
 
 
     # figure props

matplotlibrc.template

@@ -271,6 +271,7 @@ text.hinting_factor : 8 # Specifies the amount of softness for hinting in the
 #grid.color       :   black   # grid color
 #grid.linestyle   :   :       # dotted
 #grid.linewidth   :   0.5     # in points
+#grid.alpha       :   1.0     # transparency, between 0.0 and 1.0
 
 ### Legend
 #legend.fancybox      : False  # if True, use a rounded box for the