FFT plot and waterfall for gqrx

Following my success with integrating the frequency control widget from cutesdr into gqrx I have decided to try the same with the FFT plot and waterfall widget. This too seemed to be a single C++ class that might be easy to integrate into my experimental software receiver powered by GNU Radio and Qt GUI.

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GNU Radio FFT Scope Persistence Demo

Demonstration of a the persistence function of the FFT plot in GNU Radio. Persistence emulates the look of very old CRT monitors where the cursor leaves a trace of shadow. This is a new eye candy in the GNU Radio and will be available in version 3.3.0

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