Example from "Qwt User's Guide" doesn't work

Hi

Example from "Qwt User's Guide" doesn't work: http://qwt.sourceforge.net/class_qwt...oint_data.html

Output

Quote:

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C:\Users\Ivan\qt_projects\qwt\Sin\main.cpp:29: error: no matching function for call to 'QwtPlotCurve::setData(SinusData)'

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Quote:

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c:\Qwt-6.0.2\include\qwt_plot_seriesitem.h:168: candidates are: void QwtPlotSeriesItem<T>::setData(QwtSeriesData<T>*) [with T = QPointF]

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Code:

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#include <cmath>
#include <qwt_series_data.h>
#include <qwt_plot_curve.h>
#include <qwt_plot.h>
#include <qapplication.h>
 
class SinusData: public QwtSyntheticPointData
{
public:
    SinusData():
        QwtSyntheticPointData(100)
    {
    }
    virtual double y(double x) const
    {
        return qSin(x);
    }
};
 
int main(int argc, char **argv)
{
    QApplication a(argc, argv);
 
    QwtPlot plot;
    plot.setAxisScale(QwtPlot::xBottom, 0.0, 10.0);
    plot.setAxisScale(QwtPlot::yLeft, -1.0, 1.0);
 
    QwtPlotCurve *curve = new QwtPlotCurve("y = sin(x)");
    curve->setData(SinusData());
    curve->attach(&plot);
 
    plot.show();
    return a.exec();
}

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Thanks

It's very important for me. Please, help me!

Why this line doesn't work:

Code:

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curve->setData(SinusData());

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A "new" is missing in the docs - that's all. But this something the compiler told you already.

Uwe

Thanks! I'm happy :)

Code:

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curve->setData(new SinusData());

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