QScatterSeries类是Qt Charts模块的一部分，用于表示散点图。

QScatterSeries* series = new QScatterSeries();  // 创建离散点数据
    series->setName("圆点样式");
    series->setMarkerShape(QScatterSeries::MarkerShapeCircle);  //设置位圆形
    series->setMarkerSize(10);  //设置原大小
    for(int i = 0; i < 20; i++)
    {
        series->append(i, QRandomGenerator::global()->bounded(10, 50));
    }

    QScatterSeries* range = new QScatterSeries();                 // 创建一个散点数据集对象
   range->setName("方形样式");
   range->setMarkerShape(QScatterSeries::MarkerShapeRectangle);  // 设置绘制的散点的样式为矩形
   range->setMarkerSize(10);                                     // 设置绘制的点的大小

   for(int i = 0; i < 20; i++)    // 添加10个任意点
   {
       *range << QPointF(i, QRandomGenerator::global()->bounded(10, 50)); // 换一种添加数据的方式
   }

    QChart *chart = new QChart();
    chart->addSeries(series);
    chart->addSeries(range);

    chart->setTitle("Simple barchart example");
    chart->createDefaultAxes();
    chart->setAnimationOptions(QChart::SeriesAnimations);

    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);
    chartView->chart()->setTitle("li san dian");
    //设置点形状样式
    chartView->chart()->legend()->setMarkerShape(QLegend::MarkerShapeFromSeries);
    chartView->chart()->setTheme(QChart::ChartThemeBlueCerulean); //设置标背景