qt-everywhere-src-5.15.1/qtcharts/examples/charts/areachart/main.cpp

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#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QtCharts/QChartView>
#include <QtCharts/QLineSeries>
#include <QtCharts/QAreaSeries>

QT_CHARTS_USE_NAMESPACE

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

//![1]
    QLineSeries *series0 = new QLineSeries();
    QLineSeries *series1 = new QLineSeries();
//![1]

//![2]
    *series0 << QPointF(1, 5) << QPointF(3, 7) << QPointF(7, 6) << QPointF(9, 7) << QPointF(12, 6)
             << QPointF(16, 7) << QPointF(18, 5);
    *series1 << QPointF(1, 3) << QPointF(3, 4) << QPointF(7, 3) << QPointF(8, 2) << QPointF(12, 3)
             << QPointF(16, 4) << QPointF(18, 3);
//![2]

//![3]
    QAreaSeries *series = new QAreaSeries(series0, series1);
    series->setName("Batman");
    QPen pen(0x059605);
    pen.setWidth(3);
    series->setPen(pen);

    QLinearGradient gradient(QPointF(0, 0), QPointF(0, 1));
    gradient.setColorAt(0.0, 0x3cc63c);
    gradient.setColorAt(1.0, 0x26f626);
    gradient.setCoordinateMode(QGradient::ObjectBoundingMode);
    series->setBrush(gradient);
//![3]

//![4]
    QChart *chart = new QChart();
    chart->addSeries(series);
    chart->setTitle("Simple areachart example");
    chart->createDefaultAxes();
    chart->axes(Qt::Horizontal).first()->setRange(0, 20);
    chart->axes(Qt::Vertical).first()->setRange(0, 10);
//![4]

//![5]
    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);
//![5]

//![6]
    QMainWindow window;
    window.setCentralWidget(chartView);
    window.resize(400, 300);
    window.show();
//![6]

    return a.exec();
}