Qt 5.7 | Qt Charts | Piechart Drilldown Example | main.cpp Example File

Qt 5.7.1 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");

          QList<QString> months;
          months << "Jan" << "Feb" << "Mar" << "Apr" << "May" << "Jun" << "Jul" << "Aug" << "Sep" << "Oct" << "Nov" << "Dec";
          QList<QString> names;
          names << "Jane" << "John" << "Axel" << "Mary" << "Susan" << "Bob";

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

              foreach (QString month, months)
              *series << new DrilldownSlice(qrand() % 1000, month, yearSeries);

              QObject::connect(series, SIGNAL(clicked(QPieSlice*)), chart, SLOT(handleSliceClicked(QPieSlice*)));

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

          QObject::connect(yearSeries, SIGNAL(clicked(QPieSlice*)), chart, SLOT(handleSliceClicked(QPieSlice*)));

          chart->changeSeries(yearSeries);

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

          return a.exec();
      }