wavechart.cpp - mozsearch

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++ // Copyright (C) 2016 The Qt Company Ltd.

++ // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only

++

++ #include "wavechart.h"

++ #include <qmath.h>

++ #include <qrandom.h>

++

++ QT_USE_NAMESPACE

++

++ static const int numPoints =100;

++

++ WaveChart::WaveChart(QChart* chart, QWidget* parent) :

++     QChartView(chart, parent),

++     m_series(new QLineSeries()),

++     m_wave(0),

++     m_step(2 * M_PI / numPoints)

++ {

++     QPen blue(Qt::blue);

++     blue.setWidth(3);

++     m_series->setPen(blue);

++

++     chart->legend()->setVisible(false);

++

++     int fluctuate = 100;

++

++     for (qreal x = 0; x <= 2 * M_PI; x += m_step) {

++         m_series->append(x, fabs(sin(x) * fluctuate));

++     }

++

++     chart->addSeries(m_series);

++     chart->createDefaultAxes();

++

++     QObject::connect(&m_timer, SIGNAL(timeout()), this, SLOT(update()));

++     m_timer.setInterval(5000);

++     m_timer.start();

++ }

++

++ void WaveChart::update()

++ {

++

++     int fluctuate;

++     const QList<QPointF>& points = m_series->points();

++     for (qreal i = 0, x = 0; x <= 2 * M_PI; x += m_step, i++) {

++         fluctuate = QRandomGenerator::global()->bounded(100);

++         m_series->replace(x,points[i].y(),x,fabs(sin(x) * fluctuate));

++

++     }

++

++ }