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#include "donutbreakdownchart.h"
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#include <QPieSlice>
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QTCOMMERCIALCHART_USE_NAMESPACE
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//![1]
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DonutBreakdownChart::DonutBreakdownChart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
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:QChart(parent, wFlags)
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{
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// create the series for main center pie
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mainSeries = new QPieSeries();
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mainSeries->setPieSize(0.7);
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QChart::addSeries(mainSeries);
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}
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//![1]
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//![2]
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void DonutBreakdownChart::addBreakdownSeries(QPieSeries *breakdownSeries, QColor color)
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{
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// add breakdown series as a slice to center pie
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QPieSlice *slice = mainSeries->append(breakdownSeries->name(), breakdownSeries->sum());
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// customize the slice
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slice->setBrush(color);
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slice->setLabelVisible();
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slice->setLabelColor(Qt::white);
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slice->setLabelPosition(QPieSlice::LabelInsideHorizontal);
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// position and customize the breakdown series
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breakdownSeries->setPieSize(0.8);
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breakdownSeries->setHoleSize(0.7);
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breakdownSeries->setLabelsVisible();
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foreach (QPieSlice *slice, breakdownSeries->slices()) {
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color = color.lighter(110);
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slice->setBrush(color);
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slice->setLabelFont(QFont("Arial", 7));
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slice->setLabelFont(QFont("Arial", 8));
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slice->setLabelArmLengthFactor(0.05);
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}
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// add the series to the chart
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QChart::addSeries(breakdownSeries);
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// recalculate breakdown donut segments
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recalculateAngles();
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}
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//![2]
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//![3]
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void DonutBreakdownChart::recalculateAngles()
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{
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qreal angle = 0;
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foreach (QPieSlice *slice, mainSeries->slices()) {
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QPieSeries *s = find(slice->label());
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if (s) {
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s->setPieStartAngle(angle);
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angle += slice->percentage() * 360.0; // full pie is 360.0
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s->setPieEndAngle(angle);
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}
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}
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}
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//![3]
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//![4]
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QPieSeries *DonutBreakdownChart::find(QString seriesName) const
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{
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// find pieseries by name
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foreach (QAbstractSeries *series, QChart::series()) {
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QPieSeries *s = qobject_cast<QPieSeries*>(series);
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if (!s)
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continue;
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if (s->name() == seriesName)
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return s;
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}
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return 0;
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}
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//![4]
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