| /**************************************************************************** |
| ** |
| ** 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] |