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

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** This file is part of the Qt Charts module of the Qt Toolkit.
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#include "drilldownchart.h"
#include "drilldownslice.h"
#include <QtWidgets/QApplication>
#include <QtWidgets/QMainWindow>
#include <QtCore/QRandomGenerator>
#include <QtCharts/QChartView>
#include <QtCharts/QLegend>
#include <QtCharts/QPieSeries>

QT_CHARTS_USE_NAMESPACE

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

    QMainWindow window;

    DrilldownChart *chart = new DrilldownChart();
    chart->setTheme(QChart::ChartThemeLight);
    chart->setAnimationOptions(QChart::AllAnimations);
    chart->legend()->setVisible(true);
    chart->legend()->setAlignment(Qt::AlignRight);

    QPieSeries *yearSeries = new QPieSeries(&window);
    yearSeries->setName("Sales by year - All");

    const QStringList months = {
        "Jan", "Feb", "Mar", "Apr", "May", "Jun", "Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
    };
    const QStringList names = {
        "Jane", "John", "Axel", "Mary", "Susan", "Bob"
    };

    for (const QString &name : names) {
        QPieSeries *series = new QPieSeries(&window);
        series->setName("Sales by month - " + name);

        for (const QString &month : months)
            *series << new DrilldownSlice(QRandomGenerator::global()->bounded(1000), month, yearSeries);

        QObject::connect(series, &QPieSeries::clicked, chart, &DrilldownChart::handleSliceClicked);

        *yearSeries << new DrilldownSlice(series->sum(), name, series);
    }

    QObject::connect(yearSeries, &QPieSeries::clicked, chart, &DrilldownChart::handleSliceClicked);

    chart->changeSeries(yearSeries);

    QChartView *chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);
    window.setCentralWidget(chartView);
    window.resize(800, 500);
    window.show();

    return a.exec();
}