From e4681b720108e375486ea8e22d0b9bf41ad7a53a Mon Sep 17 00:00:00 2001
From: Sara Zanzottera <sara.zanzottera@cern.ch>
Date: Thu, 17 Jan 2019 11:19:16 +0100
Subject: [PATCH] Fix issue #811

---
 pyqtgraph/graphicsItems/ViewBox/ViewBox.py | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/pyqtgraph/graphicsItems/ViewBox/ViewBox.py b/pyqtgraph/graphicsItems/ViewBox/ViewBox.py
index 0982cb37..610746b2 100644
--- a/pyqtgraph/graphicsItems/ViewBox/ViewBox.py
+++ b/pyqtgraph/graphicsItems/ViewBox/ViewBox.py
@@ -1014,7 +1014,10 @@ class ViewBox(GraphicsWidget):
         self.updateViewRange()
         self.update()
         self.sigStateChanged.emit(self)
-        self.sigYRangeChanged.emit(self, tuple(self.state['viewRange'][ax]))
+        if ax:
+            self.sigYRangeChanged.emit(self, tuple(self.state['viewRange'][ax]))
+        else:
+            self.sigXRangeChanged.emit(self, tuple(self.state['viewRange'][ax]))
 
     def invertY(self, b=True):
         """