transform.py: avoid overflow errors with log scale

Author: PierreRaybaut

qwt/transform.py

@@ -166,7 +166,7 @@ def bounded(self, value):
         Modify value to be a valid value for the transformation.
         
         :param float value: Value to be bounded
-        :return: Value unmodified
+        :return: Value modified
         """
         return np.clip(value, self.LogMin, self.LogMax)
 
@@ -181,7 +181,7 @@ def transform(self, value):
         
             :py:meth:`invTransform()`
         """
-        return np.log(value)
+        return np.log(self.bounded(value))
 
     def invTransform(self, value):
         """