Qwt spline fitter - it doesn't work as expected

[Uwe]

Guess you want to interpolate the points after they have been translated to widget coordinates. QwtPlotCurve does this for you, when:

curve->setStyle(QwtPlotCurve::Lines);
curve->setCurveAttribute(QwtPlotCurve::Fitted, true);

curve->setStyle(QwtPlotCurve::Lines);
curve->setCurveAttribute(QwtPlotCurve::Fitted, true);

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If you want to pass an individual fitter:

QwtSplineCurveFitter *fitter = new QwtSplineCurveFitter();
fitter->setFitMode(fitter.ParametricSpline);
fitter->setSplineSize(...);
curve->setCurveFitter(fitter);

QwtSplineCurveFitter *fitter = new QwtSplineCurveFitter();
fitter->setFitMode(fitter.ParametricSpline);
fitter->setSplineSize(...);
curve->setCurveFitter(fitter);

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Uwe