Function main

examples/Plotter/Simple/main.cpp:30–110

// #define PLOTTED_POINTS

int main(int argc, char **argv)
{
    QApplication app(argc, argv);

#if defined PLOTTED_POINTS
    const int points = 60;
#else
    const int points = 1000;
#endif
    const qreal xMin = -2 * PI;
    const qreal xMax = 2 * PI;
    const qreal step = (xMax - xMin) / (points - 1);

    QStandardItemModel model(points, 6);

    double x = xMin;
    for (int n = 0; n < points; ++n, x += step) {
        QModelIndex index = model.index(n, 0);
        model.setData(index, x);
        index = model.index(n, 1);
        model.setData(index, sin(x) * 100.0);

        index = model.index(n, 2);
        model.setData(index, x);
        index = model.index(n, 3);
        model.setData(index, x);

        index = model.index(n, 4);
        model.setData(index, x);
        index = model.index(n, 5);
        model.setData(index, x * x * x);
    }

    model.setHeaderData(0, Qt::Horizontal, QString::fromLatin1("100 * sin(x)"));
    model.setHeaderData(2, Qt::Horizontal, QString::fromLatin1("x"));
    model.setHeaderData(4, Qt::Horizontal, QString::fromLatin1("x^3"));

    auto *chart = new KDChart::Chart();

    KDChart::AbstractCartesianDiagram *diagram = new KDChart::Plotter;
    diagram->setModel(&model);
    chart->coordinatePlane()->replaceDiagram(diagram);

#if defined PLOTTED_POINTS
    diagram->setPen(QPen(Qt::NoPen));
    const int colCount = model.columnCount(diagram->rootIndex());
    for (int iColumn = 0; iColumn < colCount; ++iColumn) {
        const QPen markerPen(diagram->brush(iColumn).color());
        KDChart::DataValueAttributes dva(diagram->dataValueAttributes(iColumn));
        KDChart::TextAttributes ta(dva.textAttributes());
        KDChart::MarkerAttributes ma(dva.markerAttributes());
        ma.setPen(markerPen);
        ma.setMarkerStyle(KDChart::MarkerAttributes::MarkerCircle);
        ma.setMarkerSize(QSize(3, 3));

        dva.setVisible(true);
        ta.setVisible(false);
        ma.setVisible(true);