QwtPlotMagnifier Invert Wheel Zoom

[jmsbc]

Hi,

I included QwtPlotMagnifier to my plot, but scrolling up on the mouse zooms out and scrolling down on the mouse zooms in. How do I switch these so that scrolling up zooms in?

Thank you,
-James

[Uwe]

Didn't try it myself, but I guess the following might invert:

virtual YourMagnifier::rescale(double factor)
{
   if ( factor != 0.0 )
       QwtPlotMagnifier::rescale(1 / factor);
}

virtual YourMagnifier::rescale(double factor)
{
   if ( factor != 0.0 )
       QwtPlotMagnifier::rescale(1 / factor);
}

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HTH,
Uwe

[jmsbc]

Didn't try it myself, but I guess the following might invert:

virtual YourMagnifier::rescale(double factor)
{
   if ( factor != 0.0 )
       QwtPlotMagnifier::rescale(1 / factor);
}

virtual YourMagnifier::rescale(double factor)
{
   if ( factor != 0.0 )
       QwtPlotMagnifier::rescale(1 / factor);
}

To copy to clipboard, switch view to plain text mode 

HTH,
Uwe

Hi Uwe,

Thanks for your solution, I can get by with this implementation in my program.

Just one problem though, now the zoom in/out with the keys are also inverted. I would also have to override setZoomInKey and setZoomOutKey right?

Anyways this will work fine for my application, thanks