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/****************************************************************************
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**
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** Copyright (C) 2014 Digia Plc
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** All rights reserved.
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** For any questions to Digia, please use contact form at http://qt.io
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**
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** This file is part of the Qt Charts module.
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**
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** Licensees holding valid commercial license for Qt may use this file in
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** accordance with the Qt License Agreement provided with the Software
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** or, alternatively, in accordance with the terms contained in a written
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** agreement between you and Digia.
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**
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** If you have questions regarding the use of this file, please use
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** contact form at http://qt.io
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**
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****************************************************************************/
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#include "donutbreakdownchart.h"
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#include "mainslice.h"
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#include <QtCharts/QPieSlice>
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#include <QtCharts/QPieLegendMarker>
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QT_CHARTS_USE_NAMESPACE
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//![1]
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DonutBreakdownChart::DonutBreakdownChart(QGraphicsItem *parent, Qt::WindowFlags wFlags)
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: QChart(QChart::ChartTypeCartesian, parent, wFlags)
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{
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// create the series for main center pie
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m_mainSeries = new QPieSeries();
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m_mainSeries->setPieSize(0.7);
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QChart::addSeries(m_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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QFont font("Arial", 8);
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// add breakdown series as a slice to center pie
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MainSlice *mainSlice = new MainSlice(breakdownSeries);
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mainSlice->setName(breakdownSeries->name());
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mainSlice->setValue(breakdownSeries->sum());
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m_mainSeries->append(mainSlice);
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// customize the slice
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mainSlice->setBrush(color);
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mainSlice->setLabelVisible();
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mainSlice->setLabelColor(Qt::white);
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mainSlice->setLabelPosition(QPieSlice::LabelInsideHorizontal);
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mainSlice->setLabelFont(font);
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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(115);
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slice->setBrush(color);
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slice->setLabelFont(font);
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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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// update customize legend markers
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updateLegendMarkers();
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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, m_mainSeries->slices()) {
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QPieSeries *breakdownSeries = qobject_cast<MainSlice *>(slice)->breakdownSeries();
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breakdownSeries->setPieStartAngle(angle);
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angle += slice->percentage() * 360.0; // full pie is 360.0
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breakdownSeries->setPieEndAngle(angle);
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}
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}
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//![3]
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//![4]
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void DonutBreakdownChart::updateLegendMarkers()
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{
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// go through all markers
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foreach (QAbstractSeries *series, series()) {
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foreach (QLegendMarker *marker, legend()->markers(series)) {
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QPieLegendMarker *pieMarker = qobject_cast<QPieLegendMarker *>(marker);
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if (series == m_mainSeries) {
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// hide markers from main series
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pieMarker->setVisible(false);
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} else {
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// modify markers from breakdown series
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pieMarker->setLabel(QString("%1 %2%")
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.arg(pieMarker->slice()->label())
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.arg(pieMarker->slice()->percentage() * 100, 0, 'f', 2));
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pieMarker->setFont(QFont("Arial", 8));
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}
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}
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}
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}
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//![4]
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