donutbreakdownchart.cpp
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r0 | /**************************************************************************** | ||
** | ||||
** 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 | ||||
** accordance with the commercial license agreement provided with the | ||||
** Software or, alternatively, in accordance with the terms contained in | ||||
** a written agreement between you and The Qt Company. For licensing terms | ||||
** and conditions see https://www.qt.io/terms-conditions. For further | ||||
** information use the contact form at https://www.qt.io/contact-us. | ||||
** | ||||
** 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 | ||||
** included in the packaging of this file. Please review the following | ||||
** information to ensure the GNU General Public License requirements will | ||||
** be met: https://www.gnu.org/licenses/gpl-3.0.html. | ||||
** | ||||
** $QT_END_LICENSE$ | ||||
** | ||||
****************************************************************************/ | ||||
#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(); | ||||
foreach (QPieSlice *slice, breakdownSeries->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; | ||||
foreach (QPieSlice *slice, m_mainSeries->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 | ||||
foreach (QAbstractSeries *series, series()) { | ||||
foreach (QLegendMarker *marker, legend()->markers(series)) { | ||||
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] | ||||