main.cpp Example File | Qt Charts 5.12.8

- Qt 5.12
- Qt Charts
- StackedBarChart Drilldown Example
- main.cpp Example File
- Qt Charts | Commercial or GPLv3

# main.cpp Example File

stackedbarchartdrilldown/main.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2016 The Qt Company Ltd.
     ** Contact: https://www.qt.io/licensing/
     **
     ** This file is part of the Qt Charts module of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:GPL$
     ** Commercial License Usage
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     ** Alternatively, this file may be used under the terms of the GNU
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     ** the Free Software Foundation and appearing in the file LICENSE.GPL3
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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();
     }