Re: Possible bug in axis labelling

On Mon, May 12, 2008 at 07:59:49PM +0200, Uwe Rathmann wrote:
> On Monday 12 May 2008 17:49, Albert Kottke wrote:
> 
> > I have tried my program in both linux and windows environments, and it
> > appears to only happen on windows (qt-4.4.0 with mingw).
> 
> Which Qwt version ?

5.1 from the subversion repository

> 
> Since Qwt 5.1 QwtScaleEngine uses DBL_EPSILON ( cfloat ) for its calculations. 
> If you are using 5.1 please check, what happens when you replace DBL_EPSILON 
> by 1.0e-6 in qwt_scale_engine.cpp.

This fixes the issue.  The DBL_EPSILON value is reported to be
2.22045e-16.

> 
> > Let me know if you need me to supply the code.
> 
> Please debug QwtLinearScaleEngine::divideScale instead and check what is going 
> wrong with the 0.0 value. What are the parameter values, when it is called ?

x1: -0.2 x2: 0.2 maxMajSteps: 8 maxMinSteps: 5 stepSize: 0.05

> 
> Uwe
> 
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