subclass every PlotWidget because logtickvalues

src/gui_qt/lib/graph_items.py

@@ -0,0 +1,53 @@
+from numpy import log10, arange, floor, ceil
+from pyqtgraph import PlotWidget, PlotItem
+
+
+__all__ = ['NMRPlotWidget', 'logTickValues']
+
+
+class NMRPlotWidget(PlotWidget):
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        for orient in ['top', 'bottom', 'left', 'right']:
+            # BAD HACK!!! but seems to work, see function for explanation
+            self.plotItem.getAxis(orient).logTickValues = logTickValues
+
+
+class NMRPlotItem(PlotItem):
+
+    def __init__(self, *args, **kwargs):
+        super().__init__(*args, **kwargs)
+
+        for orient in ['top', 'bottom', 'left', 'right']:
+            self.plotItem.getAxis(orient).logTickValues = logTickValues
+
+
+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(floor(minVal))
+        v2 = int(ceil(maxVal))
+        # major = list(range(v1+1, v2))
+        minor = []
+
+        if v2 - v1 < 400:
+            for v in range(v1, v2):
+                minor.extend(v + log10(arange(1, 10)))
+            minor = [x for x in minor if minVal < x < maxVal]
+            ticks.append((None, minor))
+    return ticks
+

src/gui_qt/lib/pg_objects.py

@@ -5,7 +5,7 @@ from pyqtgraph import (
     LinearRegionItem, mkBrush,
     mkColor, mkPen,
     PlotDataItem,
-    LegendItem, ViewBox,
+    LegendItem,
 )
 
 from nmreval.lib.colors import BaseColor, Colors