customlineseries.cpp

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// Copyright (C) 2023 The Qt Company Ltd.

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

#include "customlineseries.h"

#include <QRandomGenerator>

const int POINT_COUNT = 1000;

const float MAX_X = 4.0f;

CustomLineSeries::CustomLineSeries(QLineSeries *parent)

    : QLineSeries{ parent }

    setColor(QColorConstants::Green);

    for (int i = 0; i < POINT_COUNT; i++)

        append(QPointF(i / (POINT_COUNT / MAX_X), 0));

    // Update data with a timer

    connect(&m_updateTimer, &QTimer::timeout, this, &CustomLineSeries::updateData);

    m_updateTimer.start(16);

void CustomLineSeries::updateData()

    for (int i = 0; i < m_scanCount; i++) {

        int index = m_scanIndex + i;

        while (index >= POINT_COUNT)

            index -= POINT_COUNT;

        QPointF p(index / (POINT_COUNT / MAX_X), m_amplitude * qSin(2 * M_PI * (m_frequency / POINT_COUNT) * index + m_phase));

        replace(index, p);

    m_scanIndex += m_scanCount;

    if (m_scanIndex >= POINT_COUNT)

        m_scanIndex = 0;

    update();

qreal CustomLineSeries::frequency() const

    return m_frequency;

void CustomLineSeries::setFrequency(qreal newFrequency)

    if (qFuzzyCompare(m_frequency, newFrequency))

        return;

    m_frequency = newFrequency;

    emit frequencyChanged();

qreal CustomLineSeries::amplitude() const

    return m_amplitude;

void CustomLineSeries::setAmplitude(qreal newAmplitude)

    if (qFuzzyCompare(m_amplitude, newAmplitude))

        return;

    m_amplitude = newAmplitude;

    emit amplitudeChanged();

qreal CustomLineSeries::phase() const

    return m_phase;

void CustomLineSeries::setPhase(qreal newPhase)

    if (qFuzzyCompare(m_phase, newPhase))

        return;

    m_phase = newPhase;

    emit phaseChanged();