Fix bounding logic in QwtLogTransform to ensure value is within defined limits

Fix #101

Author: PierreRaybaut

CHANGELOG.md

@@ -3,6 +3,7 @@
 ## Version 0.14.6
 
 - Fixed [Issue #100](https://github.com/PlotPyStack/PythonQwt/issues/100) - TypeError in `QwtSymbol.drawSymbol` method due to outdated `renderSymbols` call
+- Fixed [Issue #101](https://github.com/PlotPyStack/PythonQwt/issues/101) - `RuntimeWarning: overflow encountered in cast` when plotting `numpy.float32` curve data
 
 ## Version 0.14.5
 

qwt/transform.py

@@ -169,7 +169,7 @@ def bounded(self, value):
         :param float value: Value to be bounded
         :return: Value modified
         """
-        return np.clip(value, self.LogMin, self.LogMax)
+        return max(self.LogMin, min(value, self.LogMax))
 
     def transform(self, value):
         """