plotting curve with dashed lines alternating colors

Should be possible to draw a curve using dashed lines with different alternate colors?
I want to draw a curve using red,white,yellow and repeating the pattern.

I'm looking to QwtPlotCurve::setPen but seems it is a topic related to QT properly.
Is there a way to derive QwtPlotCurve and reimplement draw methods?

Quote:

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Originally Posted by corrado1972

Is there a way to derive QwtPlotCurve and reimplement draw methods?

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Yes - the solution is to derive from QwtPlotCurve and to reimplement draw methods. :rolleyes:

Ok, more serious:

Reimplement YourCurve::drawCurve call QwtPlotCurve::drawLines for each curve segment with a different pen assigned to the painter.

Uwe