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/****************************************************************************
**
** 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 "widget.h"
#include <QtCharts/QChartView>
#include <QtCharts/QChart>
#include <QtCharts/QLegend>
#include <QtCharts/QPieSeries>
#include <QtCharts/QPieSlice>
#include <QtCore/QRandomGenerator>
#include <QtWidgets/QGridLayout>
#include <QtCore/QTimer>
QT_CHARTS_USE_NAMESPACE
Widget::Widget(QWidget *parent)
: QWidget(parent)
{
setMinimumSize(800, 600);
//! [1]
QChartView *chartView = new QChartView;
chartView->setRenderHint(QPainter::Antialiasing);
QChart *chart = chartView->chart();
chart->legend()->setVisible(false);
chart->setTitle("Nested donuts demo");
chart->setAnimationOptions(QChart::AllAnimations);
//! [1]
//! [2]
qreal minSize = 0.1;
qreal maxSize = 0.9;
int donutCount = 5;
//! [2]
//! [3]
for (int i = 0; i < donutCount; i++) {
QPieSeries *donut = new QPieSeries;
int sliceCount = 3 + QRandomGenerator::global()->bounded(3);
for (int j = 0; j < sliceCount; j++) {
qreal value = 100 + QRandomGenerator::global()->bounded(100);
QPieSlice *slice = new QPieSlice(QString("%1").arg(value), value);
slice->setLabelVisible(true);
slice->setLabelColor(Qt::white);
slice->setLabelPosition(QPieSlice::LabelInsideTangential);
connect(slice, &QPieSlice::hovered, this, &Widget::explodeSlice);
donut->append(slice);
donut->setHoleSize(minSize + i * (maxSize - minSize) / donutCount);
donut->setPieSize(minSize + (i + 1) * (maxSize - minSize) / donutCount);
}
m_donuts.append(donut);
chartView->chart()->addSeries(donut);
}
//! [3]
// create main layout
//! [4]
QGridLayout *mainLayout = new QGridLayout;
mainLayout->addWidget(chartView, 1, 1);
setLayout(mainLayout);
//! [4]
//! [5]
updateTimer = new QTimer(this);
connect(updateTimer, &QTimer::timeout, this, &Widget::updateRotation);
updateTimer->start(1250);
//! [5]
}
Widget::~Widget()
{
}
//! [6]
void Widget::updateRotation()
{
for (int i = 0; i < m_donuts.count(); i++) {
QPieSeries *donut = m_donuts.at(i);
qreal phaseShift = -50 + QRandomGenerator::global()->bounded(100);
donut->setPieStartAngle(donut->pieStartAngle() + phaseShift);
donut->setPieEndAngle(donut->pieEndAngle() + phaseShift);
}
}
//! [6]
//! [7]
void Widget::explodeSlice(bool exploded)
{
QPieSlice *slice = qobject_cast<QPieSlice *>(sender());
if (exploded) {
updateTimer->stop();
qreal sliceStartAngle = slice->startAngle();
qreal sliceEndAngle = slice->startAngle() + slice->angleSpan();
QPieSeries *donut = slice->series();
qreal seriesIndex = m_donuts.indexOf(donut);
for (int i = seriesIndex + 1; i < m_donuts.count(); i++) {
m_donuts.at(i)->setPieStartAngle(sliceEndAngle);
m_donuts.at(i)->setPieEndAngle(360 + sliceStartAngle);
}
} else {
for (int i = 0; i < m_donuts.count(); i++) {
m_donuts.at(i)->setPieStartAngle(0);
m_donuts.at(i)->setPieEndAngle(360);
}
updateTimer->start();
}
slice->setExploded(exploded);
}
//! [7]
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