Plot Points from QwtPointArrayData with color according to Y Achsis

[tklemmer]

Hello

I have a series of dataset that I'm trying to plot, which works just fine.

Code looks kinda like this:

QwtPointArrayData *zing;
	zing = new QwtPointArrayData(x,y);
 
        QwtPlotCurve plotdata;
	plotdata.setStyle( QwtPlotCurve::Dots );
	plotdata.setData(zing);
 
	plotdata.attach(qwtPlot);
	qwtPlot->replot();

QwtPointArrayData *zing;
	zing = new QwtPointArrayData(x,y);

        QwtPlotCurve plotdata;
	plotdata.setStyle( QwtPlotCurve::Dots );
	plotdata.setData(zing);

	plotdata.attach(qwtPlot);
	qwtPlot->replot();

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works just fine...

Now I'm trying to give the Points a Different Colors according to ther Y Values but have no clue how?!

How could this be done?

thanks
Tk

[Uwe]

Use QwtPlotSpectroCurve and implement your own type of QwtSeriesData<QwtPoint3D> object, where you store your 2D point array only, but calculate the z value from the y value inside of YourData::sample().

Uwe