Spectrogram zooming change

[azcoder]

The Qwt examples are intended to show what - and how things - can be done. In this version the spectrogram example shows a different mode of the zoomer/picker class. That's all.

Uwe

I am not sure I made myself clear. So I will try again. I compiled the sample program under Fedora 12. Moved it to Fedora 14 and ran it. It runs different as I stated in my original message. I want it to run exactly like it did in Fedora 12. What do I need to do to have the example run the same on Fedora 12 and 14? Something must have changed (maybe a default) that now changes the mode of operation.

Jim

[Uwe]

Something must have changed (maybe a default) that now changes the mode of operation.

Ah right - there was a bug in Qwt 5.2.0 ( and many earlier versions ) where the zoomer was initialized by ( QwtPicker::RectSelection & QwtPicker::ClickSelection ) instead of ( QwtPicker::RectSelection | QwtPicker::ClickSelection ). When fixing this bug I seem to have missed, that this breaks the compatibility of applications, that doesn't configure the zoomer.

If you want to have a selection model like in the bode example you have to add this line:

zoomer->setSelectionFlags(QwtPicker::RectSelection | QwtPicker::DragSelection);

zoomer->setSelectionFlags(QwtPicker::RectSelection | QwtPicker::DragSelection);

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In Qwt 6 "QwtPicker::RectSelection | QwtPicker::DragSelection" is the default setting of the zoomer.

Uwe