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/****************************************************************************
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**
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** Copyright (C) 2016 The Qt Company Ltd.
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** Contact: https://www.qt.io/licensing/
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**
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** This file is part of the Qt Charts module of the Qt Toolkit.
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**
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** $QT_BEGIN_LICENSE:GPL$
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** Commercial License Usage
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** Licensees holding valid commercial Qt licenses may use this file in
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** accordance with the commercial license agreement provided with the
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** Software or, alternatively, in accordance with the terms contained in
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** a written agreement between you and The Qt Company. For licensing terms
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** and conditions see https://www.qt.io/terms-conditions. For further
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** information use the contact form at https://www.qt.io/contact-us.
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**
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** GNU General Public License Usage
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** Alternatively, this file may be used under the terms of the GNU
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** General Public License version 3 or (at your option) any later version
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** approved by the KDE Free Qt Foundation. The licenses are as published by
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** the Free Software Foundation and appearing in the file LICENSE.GPL3
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** included in the packaging of this file. Please review the following
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** information to ensure the GNU General Public License requirements will
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** be met: https://www.gnu.org/licenses/gpl-3.0.html.
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**
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** $QT_END_LICENSE$
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**
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****************************************************************************/
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#include "wavechart.h"
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#include <cmath>
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QT_CHARTS_USE_NAMESPACE
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#define PI 3.14159265358979
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static const int numPoints =100;
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WaveChart::WaveChart(QChart* chart, QWidget* parent) :
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QChartView(chart, parent),
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m_series(new QLineSeries()),
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m_wave(0),
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m_step(2 * PI / numPoints)
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{
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QPen blue(Qt::blue);
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blue.setWidth(3);
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m_series->setPen(blue);
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chart->legend()->setVisible(false);
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QTime now = QTime::currentTime();
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qsrand((uint) now.msec());
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int fluctuate = 100;
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for (qreal x = 0; x <= 2 * PI; x += m_step) {
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m_series->append(x, fabs(sin(x) * fluctuate));
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}
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chart->addSeries(m_series);
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chart->createDefaultAxes();
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QObject::connect(&m_timer, SIGNAL(timeout()), this, SLOT(update()));
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m_timer.setInterval(5000);
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m_timer.start();
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}
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void WaveChart::update()
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{
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int fluctuate;
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const QList<QPointF>& points = m_series->points();
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for (qreal i = 0, x = 0; x <= 2 * PI; x += m_step, i++) {
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fluctuate = qrand() % 100;
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m_series->replace(x,points[i].y(),x,fabs(sin(x) * fluctuate));
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}
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}
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