Share color cycle between left and right axes

Author: lesteve

pandas/tools/plotting.py

@@ -807,6 +807,8 @@ def _maybe_right_yaxis(self, ax):
 
         if (sec_true or has_sec) and not hasattr(ax, 'right_ax'):
             orig_ax, new_ax = ax, ax.twinx()
+            new_ax._get_lines.color_cycle = orig_ax._get_lines.color_cycle
+
             orig_ax.right_ax, new_ax.left_ax = new_ax, orig_ax
 
             if len(orig_ax.get_lines()) == 0:  # no data on left y
@@ -2146,6 +2148,8 @@ def on_right(i):
     if on_right(0):
         orig_ax = ax0
         ax0 = ax0.twinx()
+        ax0._get_lines.color_cycle = orig_ax._get_lines.color_cycle
+
         orig_ax.get_yaxis().set_visible(False)
         orig_ax.right_ax = ax0
         ax0.left_ax = orig_ax
@@ -2163,6 +2167,8 @@ def on_right(i):
         if on_right(i):
             orig_ax = ax
             ax = ax.twinx()
+            ax._get_lines.color_cycle = orig_ax._get_lines.color_cycle
+
             orig_ax.get_yaxis().set_visible(False)
         axarr[i] = ax