donutbreakdownchart.cpp Example File

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#include "donutbreakdownchart.h" #include "mainslice.h" #include <QtCharts/QPieSlice> #include <QtCharts/QPieLegendMarker> QT_CHARTS_USE_NAMESPACE DonutBreakdownChart::DonutBreakdownChart(QGraphicsItem *parent, Qt::WindowFlags wFlags) : QChart(QChart::ChartTypeCartesian, parent, wFlags) { // create the series for main center pie m_mainSeries = new QPieSeries(); m_mainSeries->setPieSize(0.7); QChart::addSeries(m_mainSeries); } void DonutBreakdownChart::addBreakdownSeries(QPieSeries *breakdownSeries, QColor color) { QFont font("Arial", 8); // add breakdown series as a slice to center pie MainSlice *mainSlice = new MainSlice(breakdownSeries); mainSlice->setName(breakdownSeries->name()); mainSlice->setValue(breakdownSeries->sum()); m_mainSeries->append(mainSlice); // customize the slice mainSlice->setBrush(color); mainSlice->setLabelVisible(); mainSlice->setLabelColor(Qt::white); mainSlice->setLabelPosition(QPieSlice::LabelInsideHorizontal); mainSlice->setLabelFont(font); // position and customize the breakdown series breakdownSeries->setPieSize(0.8); breakdownSeries->setHoleSize(0.7); breakdownSeries->setLabelsVisible(); const auto slices = breakdownSeries->slices(); for (QPieSlice *slice : slices) { color = color.lighter(115); slice->setBrush(color); slice->setLabelFont(font); } // add the series to the chart QChart::addSeries(breakdownSeries); // recalculate breakdown donut segments recalculateAngles(); // update customize legend markers updateLegendMarkers(); } void DonutBreakdownChart::recalculateAngles() { qreal angle = 0; const auto slices = m_mainSeries->slices(); for (QPieSlice *slice : slices) { QPieSeries *breakdownSeries = qobject_cast<MainSlice *>(slice)->breakdownSeries(); breakdownSeries->setPieStartAngle(angle); angle += slice->percentage() * 360.0; // full pie is 360.0 breakdownSeries->setPieEndAngle(angle); } } void DonutBreakdownChart::updateLegendMarkers() { // go through all markers const auto allseries = series(); for (QAbstractSeries *series : allseries) { const auto markers = legend()->markers(series); for (QLegendMarker *marker : markers) { QPieLegendMarker *pieMarker = qobject_cast<QPieLegendMarker *>(marker); if (series == m_mainSeries) { // hide markers from main series pieMarker->setVisible(false); } else { // modify markers from breakdown series pieMarker->setLabel(QString("%1 %2%") .arg(pieMarker->slice()->label()) .arg(pieMarker->slice()->percentage() * 100, 0, 'f', 2)); pieMarker->setFont(QFont("Arial", 8)); } } } }

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