QT : a individual marker size for each point in a QScatterSeries

#include <QApplication>
#include <QtCharts>

QT_CHARTS_USE_NAMESPACE

struct Data{
    qreal r;
    qreal a;
    qreal s;
};

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QChartView view;
    QPolarChart *chart = new QPolarChart;

    std::vector<Data> data;

    for(int i=0; i <= 360; i+=30){
        data.push_back(Data{i*1.0, i*1.0, 2*qAbs(sin(i*3.14159265358979323846/360))});
    }

    view.setChart(chart);
    QScatterSeries *series = new QScatterSeries;
    for(const Data & d: data){
        *series << QPointF(d.a, d.r);
    }

    chart->addSeries(series);
    chart->createDefaultAxes();
    view.show();

    for(int index= 0; index < series->count(); index++){
        QPointF p =  chart->mapToPosition(series->at(index) , series);
        QGraphicsItem *it = view.itemAt(view.mapFromScene(p));
        it->setTransformOriginPoint(it->boundingRect().center());
        it->setScale(data[index].s);
    }

    return a.exec();
}