Qt 5.9 | Qt Charts | StackedBarChart Drilldown Example | main.cpp Example File

Qt 5.9.3 Reference Documentation

# main.cpp Example File

stackedbarchartdrilldown/main.cpp

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      ** Contact: https://www.qt.io/licensing/
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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 <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, 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, 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 << (qrand() % 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->axisX()->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();
      }