QwtPlotPicker::getInvTransform does not map to correct plot coordinates

[Uwe]

Strange. I am using the 5.2.1 version and it does exist in that version. So what would you advise me to use?

QwtPlotPicker has a method invTransform - if you see a method getInvTransform you are probably working with a version, that has been patched by someone. Try to find the author of this patch and ask him/her what it is about.

Uwe