Merge pull request #10568 from AlexHarn/ratio_fix

timhoffm · web-flow · commit f9b67a4c6a81 · 2018-02-27T22:22:35.000+01:00
Prevent ZeroDivisionError when devicePixelRatio() returns 0
diff --git a/lib/matplotlib/backends/backend_qt5.py b/lib/matplotlib/backends/backend_qt5.py
@@ -269,7 +269,8 @@ def _update_figure_dpi(self):
     def _dpi_ratio(self):
         # Not available on Qt4 or some older Qt5.
         try:
-            return self.devicePixelRatio()
+            # self.devicePixelRatio() returns 0 in rare cases
+            return self.devicePixelRatio() or 1
         except AttributeError:
             return 1
 
