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

Qt 5.9.3 Reference Documentation

# main.cpp Example File

piechartdrilldown/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 "drilldownchart.h"
      #include "drilldownslice.h"
      #include <QtWidgets/QApplication>
      #include <QtWidgets/QMainWindow>
      #include <QtCore/QTime>
      #include <QtCharts/QChartView>
      #include <QtCharts/QLegend>
      #include <QtCharts/QPieSeries>

      QT_CHARTS_USE_NAMESPACE

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

          qsrand(QTime(0, 0, 0).secsTo(QTime::currentTime()));

          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(qrand() % 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();
      }