QChart绘制折线区域

Posted 2021-01-28 zhangxuan

效果图：

 

 

代码：

    // 创建折线上点的序列

    QLineSeries *splineSeries = new QLineSeries();

    //QSplineSeries *splineSeries = new QSplineSeries();

    splineSeries->setName("spline");

    splineSeries->append(0, 6);

    splineSeries->append(2, 4);

    splineSeries->append(3, 8);

    splineSeries->append(7, 4);

    splineSeries->append(10, 5);

    *splineSeries << QPointF(11, 1) << QPointF(13, 3) << QPointF(17, 6) << QPointF(18, 3) << QPointF(20, 2);

    // 标记点

    QScatterSeries *scatterSeries = new QScatterSeries();

    scatterSeries->setPointLabelsFormat("@yPoint");

    scatterSeries->setPointLabelsVisible();

    scatterSeries->setMarkerSize(8);

    scatterSeries->append(0, 6);

    scatterSeries->append(2, 4);

    scatterSeries->append(3, 8);

    scatterSeries->append(7, 4);

    scatterSeries->append(10, 5);

    *scatterSeries << QPointF(11, 1) << QPointF(13, 3) << QPointF(17, 6) << QPointF(18, 3) << QPointF(20, 2);

    //区域填充

    QAreaSeries *series = new QAreaSeries(splineSeries);

    series->setName("Batman");

    QPen pen(0x059605);

    pen.setWidth(3);

    series->setPen(pen);

    // 使用点的序列创建图标

    QChart *chart = new QChart();

    chart->legend()->hide();

    chart->addSeries(splineSeries);

    chart->addSeries(scatterSeries);

    chart->addSeries(series);

    chart->createDefaultAxes();

    chart->axisY()->setRange(0, 10);

//    //X轴下标

//    QStringList categories;

//    categories << "Jan" << "Feb" << "Mar" << "Apr" << "May" ;

//    QBarCategoryAxis *axisX = new QBarCategoryAxis();

//    axisX->append(categories);

//    chart->setAxisX(axisX, scatterSeries);

    QChartView *chartView = new QChartView(chart);

    chartView->setRenderHint(QPainter::Antialiasing);

    MainWindow w;

    w.setCentralWidget(chartView);

    w.show();