So, ok, here's the deal: It's a bit indirect, but not overly complex :)
there's already a CF marker inFrequencyDisplayPlot.cc(that's the actual plotting widget); search for CF in the source code. That one is initialized in the constructor, and immediately hidden. What you'd need to do is add a method that sets that marker's x coordinate, and add that to bothFrequencyDisplayPlot.ccand ~.h (under "slots:").
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Re: [Discuss-gnuradio] Discuss-gnuradio Digest, Vol 156, Issue 9,
David Hoelzer<=