overwrite logTickValues of AaxisItem to avoid to many minor ticks; maybe closes #110

src/gui_qt/graphs/graphwindow.py

@@ -104,6 +104,10 @@ class QGraphWindow(QtWidgets.QGraphicsView, Ui_GraphWindow):
         self.plotItem.ctrl.logXCheck.blockSignals(True)
         self.plotItem.ctrl.logYCheck.blockSignals(True)
 
+        for orient in ['top', 'bottom', 'left', 'right']:
+            # BAD HACK!!! but seems to work, see function for explanation
+            self.plotItem.getAxis(orient).logTickValues = logTickValues
+
         for lineedit in [self.xmin_lineedit, self.xmax_lineedit, self.ymin_lineedit, self.ymax_lineedit]:
             lineedit.setValidator(QtGui.QDoubleValidator())
 
@@ -144,7 +148,7 @@ class QGraphWindow(QtWidgets.QGraphicsView, Ui_GraphWindow):
                 tmp = [np.nan, np.nan]
                 for j, x in enumerate(r[i]):
                     try:
-                        tmp[j] = 10**x
+                        tmp[j] = 10**min(x, 199)
                     except OverflowError:
                         pass
                 r[i] = tuple(tmp)
@@ -423,6 +427,9 @@ class QGraphWindow(QtWidgets.QGraphicsView, Ui_GraphWindow):
     def set_logmode(self, xmode: bool = None, ymode: bool = None):
         r = self.ranges
 
+        self.plotItem.setXRange(*r[0])
+        self.plotItem.setYRange(*r[1])
+
         if xmode is None:
             xmode = self.plotItem.ctrl.logXCheck.isChecked()
         else:
@@ -766,3 +773,31 @@ class QGraphWindow(QtWidgets.QGraphicsView, Ui_GraphWindow):
         temp = self._fgcolor, self._bgcolor
         self.set_color(foreground=self._prev_colors[0], background=self._prev_colors[1])
         self._prev_colors = temp
+
+
+def logTickValues(minVal, maxVal, size, stdTicks):
+    # TODO FIND A BETTER SOLUTION!!!
+    # Sometimes minVal and maxVal are not log-scaled values and the loop from v1 to v2 is humongous,
+    # The minor list then fills the RAM completely and freezes everything
+    # Until there is a better solution, we overwrite this function for every AxesItem
+    # and do not draw minor ticks at all if there are too many
+
+    # start with the tick spacing given by tickValues().
+    # Any level whose spacing is < 1 needs to be converted to log scale
+    ticks = []
+    for (spacing, t) in stdTicks:
+        if spacing >= 1.0:
+            ticks.append((spacing, t))
+
+    if len(ticks) < 3:
+        v1 = int(np.floor(minVal))
+        v2 = int(np.ceil(maxVal))
+        # major = list(range(v1+1, v2))
+        minor = []
+
+        if v2 - v1 < 400:
+            for v in range(v1, v2):
+                minor.extend(v + np.log10(np.arange(1, 10)))
+            minor = [x for x in minor if x>minVal and x<maxVal]
+            ticks.append((None, minor))
+    return ticks