custom curves including text

[cradle]

Hey ho,

I am trying to build a Waveformgenerator with QWT so I need curves for the 1bit signals and curves for the multibit signals. In other Waveformgenerators the multibit signals looks like you can see in the attachment.
A naive idea would be deriving from QwtPlotCurve. The new class would include 2 QwtPlotCurves and a method to print text on the canvas (is this possible?).

Maybe anyone knows a cool way to implement curves like this? How do I print text to canvas?

Thanks!