I am making a spectrum display based on the RtFFT code.
My problem is how to set the x axis scale labels dynamically.
Looked at the cpuplot example and they are set dynamically but in an incremental fashion.
Mine need to be recalculated on the fly. The setAxisScale is done using an Xmin value and the set sample rate, so those are the axis labels that show up on the display. The center of the display will correspond to a radio frequency value that is known.
I know how to calculate the correct label values, but how to apply them? QwtScaleDraw? But I don't see any function to set the label values.

Thanks for any help.