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));