| /**************************************************************************** |
| ** |
| ** 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 |
| ** Licensees holding valid commercial Qt licenses may use this file in |
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| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
| ** General Public License version 3 or (at your option) any later version |
| ** approved by the KDE Free Qt Foundation. The licenses are as published by |
| ** the Free Software Foundation and appearing in the file LICENSE.GPL3 |
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| ****************************************************************************/ |
| #include "donutbreakdownchart.h" |
| #include "mainslice.h" |
| #include <QtCharts/QPieSlice> |
| #include <QtCharts/QPieLegendMarker> |
| |
| QT_CHARTS_USE_NAMESPACE |
| |
| //![1] |
| 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); |
| } |
| //![1] |
| |
| //![2] |
| 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(); |
| } |
| //![2] |
| |
| //![3] |
| 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); |
| } |
| } |
| //![3] |
| |
| //![4] |
| 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)); |
| } |
| } |
| } |
| } |
| //![4] |