QwtScaleDiv/QwtScaleDraw: fixed when there are no ticks defined

Author: Pierre Raybaut

qwt/qwt_scale_div.py

@@ -11,6 +11,7 @@ class QwtScaleDiv(object):
     MinorTick, MediumTick, MajorTick, NTickTypes = range(4)
 
     def __init__(self, *args):
+        self.__ticks = None
         if len(args) == 2 and isinstance(args[1], (tuple, list)):
             interval, ticks = args
             self.__lowerBound = interval.minValue()
@@ -63,6 +64,8 @@ def range(self):
         return self.__upperBound - self.__lowerBound
 
     def __eq__(self, other):
+        if self.__ticks is None:
+            return False
         if self.__lowerBound != other.__lowerBound or\
            self.__upperBound != other.__upperBound:
             return False
@@ -111,7 +114,7 @@ def setTicks(self, tickType, ticks):
             self.__ticks[tickType] = ticks
 
     def ticks(self, tickType):
-        if tickType in range(self.NTickTypes):
+        if self.__ticks is not None and tickType in range(self.NTickTypes):
             return self.__ticks[tickType]
         else:
             return []

qwt/qwt_scale_draw.py

@@ -550,14 +550,18 @@ def labelAlignment(self):
         return self.__data.labelAlignment
 
     def maxLabelWidth(self, font):
+        ticks = self.scaleDiv().ticks(QwtScaleDiv.MajorTick)
+        if not ticks:
+            return 0
         return ceil(max([self.labelSize(font, v).width()
-                         for v in self.scaleDiv().ticks(QwtScaleDiv.MajorTick)
-                         if self.scaleDiv().contains(v)]))
+                         for v in ticks if self.scaleDiv().contains(v)]))
 
     def maxLabelHeight(self, font):
+        ticks = self.scaleDiv().ticks(QwtScaleDiv.MajorTick)
+        if not ticks:
+            return 0
         return ceil(max([self.labelSize(font, v).height()
-                         for v in self.scaleDiv().ticks(QwtScaleDiv.MajorTick)
-                         if self.scaleDiv().contains(v)]))
+                         for v in ticks if self.scaleDiv().contains(v)]))
 
     def updateMap(self):
         pos = self.__data.pos