added first version of a backup system (#37)

Co-authored-by: Dominik Demuth <dominik.demuth@physik.tu-darmstadt.de>
Reviewed-on: #37

src/gui_qt/graphs/graphwindow.py

@@ -7,6 +7,7 @@ import uuid
 from math import isnan
 from pathlib import Path
 
+import numpy as np
 from numpy import errstate, floor, log10
 from pyqtgraph import GraphicsObject, getConfigOption, mkColor
 
@@ -137,7 +138,13 @@ class QGraphWindow(QtWidgets.QGraphicsView, Ui_GraphWindow):
         r = self.plotItem.getViewBox().viewRange()
         for i in [0, 1]:
             if self.log[i]:
-                r[i] = tuple([10**x for x in r[i]])
+                tmp = [np.nan, np.nan]
+                for j, x in enumerate(r[i]):
+                    try:
+                        tmp[j] = 10**x
+                    except OverflowError:
+                        pass
+                r[i] = tuple(tmp)
             else:
                 r[i] = tuple(r[i])