Merge pull request #1143 from psavery/catch-mouse-move-index-error

Catch IndexError on mouse move

hexrd/ui/image_tab_widget.py

@@ -281,8 +281,17 @@ def on_motion_notify_event(self, event):
         if event.inaxes.get_images():
             # Image was created with imshow()
             artist = event.inaxes.get_images()[0]
+
             i, j = utils.coords2index(artist, info['x_data'], info['y_data'])
-            intensity = artist.get_array().data[i, j]
+            try:
+                intensity = artist.get_array().data[i, j]
+            except IndexError:
+                # Most likely, this means we are slightly out of bounds,
+                # and the index is too big. Just clear the status bar in
+                # this case.
+                # FIXME: can we avoid this somehow?
+                self.clear_mouse_position.emit()
+                return
         else:
             # This is probably just a plot. Do not calculate intensity.
             intensity = None