Method paintEvent

src/gui/WaveformWidget.cpp:168–274

}

void WaveformWidget::paintEvent(QPaintEvent* event)
{
    Q_UNUSED(event);

    QPainter painter(this);
    painter.setRenderHint(QPainter::Antialiasing, false);
    painter.fillRect(rect(), kBackground());

    QRectF plotRect = QRectF(rect()).adjusted(5.0, 18.0, -34.0, -17.0);
    if (plotRect.width() < 24.0 || plotRect.height() < 36.0)
        plotRect = QRectF(rect()).adjusted(4.0, 17.0, -30.0, -16.0);

    const RingBuffer& buffer = activeBuffer();
    const QString source = (m_paused ? m_pausedTransmitting : m_transmitting)
        ? QStringLiteral("TX")
        : QStringLiteral("RX");
    const int sampleRate = sanitizeSampleRate(m_paused
        ? m_pausedSampleRate
        : buffer.sampleRate);
    if (m_paused) {
        m_displaySamples = m_pausedSamples;
    } else {
        const int windowSamples = std::max(1, sampleRate * m_windowMs / 1000);
        copyLatest(buffer, windowSamples, m_displaySamples);
    }

    float peak = 0.0f;
    double sumSq = 0.0;
    int clipCount = 0;
    for (float s : m_displaySamples) {
        const float a = std::abs(s);
        peak = std::max(peak, a);
        sumSq += static_cast<double>(s) * s;
        if (a >= 0.98f)
            ++clipCount;
    }
    const float rms = m_displaySamples.isEmpty()
        ? 0.0f
        : static_cast<float>(std::sqrt(sumSq / m_displaySamples.size()));
    const float peakDb = linearToDb(peak);
    const float rmsDb = linearToDb(rms);

    if (m_viewMode == ViewMode::VerticalBars) {
        drawBarsGrid(painter, plotRect);
        if (!m_displaySamples.isEmpty())
            drawVerticalBars(painter, plotRect, sampleRate);
    } else if (m_viewMode == ViewMode::Envelope) {
        drawGrid(painter, plotRect, sampleRate);
        if (!m_displaySamples.isEmpty())
            drawEnvelope(painter, plotRect, clipCount);
    } else if (m_viewMode == ViewMode::Bars) {
        drawBarsGrid(painter, plotRect);
        if (!m_displaySamples.isEmpty())
            drawBars(painter, plotRect);
    } else {
        drawGrid(painter, plotRect, sampleRate);
        if (!m_displaySamples.isEmpty())
            drawGraph(painter, plotRect, clipCount);