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

Qt 5.9.3 Reference Documentation

# drilldownchart.cpp Example File

piechartdrilldown/drilldownchart.cpp

      /****************************************************************************
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      ** Copyright (C) 2016 The Qt Company Ltd.
      ** 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"

      QT_CHARTS_USE_NAMESPACE

      DrilldownChart::DrilldownChart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
          : QChart(QChart::ChartTypeCartesian, parent, wFlags),
            m_currentSeries(0)
      {

      }

      DrilldownChart::~DrilldownChart()
      {

      }

      void DrilldownChart::changeSeries(QAbstractSeries *series)
      {
          // NOTE: if the series is owned by the chart it will be deleted
          // here the "window" owns the series...
          if (m_currentSeries)
              removeSeries(m_currentSeries);
          m_currentSeries = series;
          addSeries(series);
          setTitle(series->name());
      }

      void DrilldownChart::handleSliceClicked(QPieSlice *slice)
      {
          DrilldownSlice *drilldownSlice = static_cast<DrilldownSlice *>(slice);
          changeSeries(drilldownSlice->drilldownSeries());
      }

      #include "moc_drilldownchart.cpp"