MNT: use public API on gc not private attributes

tacaswell · tacaswell · commit 51f070536cdb · 2017-07-10T22:45:57.000-05:00
diff --git a/lib/matplotlib/backends/backend_pdf.py b/lib/matplotlib/backends/backend_pdf.py
@@ -1626,12 +1626,12 @@ def check_gc(self, gc, fillcolor=None):
 
         orig_alphas = getattr(gc, '_effective_alphas', (1.0, 1.0))
 
-        if gc._rgb is None:
+        if gc.get_rgb() is None:
             # it should not matter what color here
             # since linewidth should be 0
             # unless affected by global settings in rcParams
             # hence setting zero alpha just incase
-            gc._rgb = [0, 0, 0, 0]
+            gc.set_foreground((0, 0, 0, 0), isRGBA=True)
 
         if gc._forced_alpha:
             gc._effective_alphas = (gc._alpha, gc._alpha)
