Add _fade_to to GraphWidget.

theengineear · theengineear · commit 49e46c5ef212 · 2015-04-07T22:32:39.000-04:00
diff --git a/plotly/widgets/graph_widget.py b/plotly/widgets/graph_widget.py
@@ -841,3 +841,11 @@ def extend_traces(self, update, indices=(0,), max_points=None):
         if max_points is not None:
             message['maxPoints'] = max_points
         self._handle_outgoing_message(message)
+
+    def _fade_to(self, duration, opacity):
+        """
+        Change the opacity to give a visual signal to users.
+
+        """
+        message = {'fadeTo': True, 'duration': duration, 'opacity': opacity}
+        self._handle_outgoing_message(message)
