main.cpp Example File

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

 QT_CHARTS_USE_NAMESPACE

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

     DrilldownChart *drilldownChart =  new DrilldownChart();
     drilldownChart->setAnimationOptions(QChart::SeriesAnimations);

     // Define categories
     const QStringList months = {
         "May", "Jun", "Jul", "Aug", "Sep"
     };
     const QStringList weeks = {
         "week 1", "week 2", "week 3", "week 4"
     };
     const QStringList plants = {
         "Habanero", "Lemon Drop", "Starfish", "Aji Amarillo"
     };

     // Create drilldown structure
     DrilldownBarSeries *seasonSeries = new DrilldownBarSeries(months, 320, drilldownChart);
     seasonSeries->setName("Crop by month - Season");

     // Each month in season series has drilldown series for weekly data
     for (int month = 0; month < months.count(); month++) {

         // Create drilldown series for every week
         DrilldownBarSeries *weeklySeries = new DrilldownBarSeries(weeks, 80, drilldownChart);
         seasonSeries->mapDrilldownSeries(month, weeklySeries);

         // Drilling down from weekly data brings us back to season data.
         for (int week = 0; week < weeks.count(); week++) {
             weeklySeries->mapDrilldownSeries(week, seasonSeries);
             weeklySeries->setName(QString("Crop by week - " + months.at(month)));
         }

         // Use clicked signal to implement drilldown
         QObject::connect(weeklySeries, &DrilldownBarSeries::clicked,
                          drilldownChart, &DrilldownChart::handleClicked);
     }

     // Enable drilldown from season series using clicked signal
     QObject::connect(seasonSeries, &DrilldownBarSeries::clicked,
                      drilldownChart, &DrilldownChart::handleClicked);

     // Fill monthly and weekly series with data
     for (const QString &plant : plants) {
         QBarSet *monthlyCrop = new QBarSet(plant);
         for (int month = 0; month < months.count(); month++) {
             QBarSet *weeklyCrop = new QBarSet(plant);
             for (int week = 0; week < weeks.count(); week++)
                 *weeklyCrop << QRandomGenerator::global()->bounded(20);
             // Get the drilldown series from season series and add crop to it.
             seasonSeries->drilldownSeries(month)->append(weeklyCrop);
             *monthlyCrop << weeklyCrop->sum();
         }
         seasonSeries->append(monthlyCrop);
     }

     // Show season series in initial view
     drilldownChart->changeSeries(seasonSeries);
     drilldownChart->setTitle(seasonSeries->name());

     drilldownChart->axes(Qt::Horizontal).first()->setGridLineVisible(false);
     drilldownChart->legend()->setVisible(true);
     drilldownChart->legend()->setAlignment(Qt::AlignBottom);

     QChartView *chartView = new QChartView(drilldownChart);
     window.setCentralWidget(chartView);
     window.resize(480, 300);
     window.show();

     return a.exec();
 }