Fill area between two baselines(one at top, one at bottom.

I intend to fill the area on curve between two lines(in my case horizontal). I believe for only one baseline, the requisite methods are QwtPlotCurve::setBrush() and QwtPlotCurve::setBaseline(). But how do I set two baselines?
I think the problem in this thread Fill-area-above-baseline-and-below-the-curve is very similar. However from Qwt6 I see QwtPlotCurve::fillCurve() method as virtual. Can anyone suggest how to go ahead and add more than one baselines?

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Originally Posted by pkj

I intend to fill the area on curve between two lines(in my case horizontal).

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??? - what do you want to do ?

Uwe

Quote:

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??? - what do you want to do ?

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The variable I am trying to monitor is supposed to fluctuate between a High and Low value. Anything between High and Low is alright, higher than high and lower than low is not. So if I shade ok zone with green and not ok zone with red, it gives for easy identification.
So, instead of shading the area between the baseline and curve, I have to shade area between a high line, curve and low line. Hope I make sense.

Quote:

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Originally Posted by pkj

Anything between High and Low is alright, higher than high and lower than low is not. So if I shade ok zone with green and not ok zone with red, it gives for easy identification.
So, instead of shading the area between the baseline and curve, I have to shade area between a high line, curve and low line. Hope I make sense.

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Sounds like you want to fill the area between high and low - the curve itsself doesn't matter.

But what is high/low in your case:

1. an fixed intervall y1->y2
2. a corridor between 2 curves

In case of 2 you can use QwtPlotIntervalCurve, in case of 1 see http://www.qtcentre.org/threads/4428...-on-a-Qwt-Plot.

Uwe