Method drawGraph

src/gui/WaveformWidget.cpp:449–516

}

void WaveformWidget::drawGraph(QPainter& painter,
                               const QRectF& plotRect,
                               int clipCount)
{
    const int columnCount = std::max(1, static_cast<int>(std::floor(plotRect.width())));
    buildColumns(columnCount);
    if (m_columns.isEmpty())
        return;

    const qreal centerY = plotRect.center().y();
    const qreal halfHeight = std::max<qreal>(1.0, plotRect.height() * 0.5 - 2.0);
    const qreal left = plotRect.left();
    const QColor wave = waveformColor();

    QPainterPath peakTop;
    QPainterPath peakBottom;
    QPainterPath rmsTop;
    QPainterPath rmsBottom;

    painter.setPen(QPen(wave, waveformLineWidth(), Qt::SolidLine, Qt::RoundCap));
    for (int x = 0; x < m_columns.size(); ++x) {
        const ColumnStats& c = m_columns[x];
        const qreal px = left + x + 0.5;
        const qreal minY = centerY - std::clamp(c.min * m_amplitudeZoom, -1.0f, 1.0f) * halfHeight;
        const qreal maxY = centerY - std::clamp(c.max * m_amplitudeZoom, -1.0f, 1.0f) * halfHeight;
        painter.drawLine(QPointF(px, minY), QPointF(px, maxY));

        const qreal peak = std::clamp(c.peak * m_amplitudeZoom, 0.0f, 1.0f);
        const qreal rms = std::clamp(c.rms * m_amplitudeZoom, 0.0f, 1.0f);
        const qreal peakTopY = centerY - peak * halfHeight;
        const qreal peakBottomY = centerY + peak * halfHeight;
        const qreal rmsTopY = centerY - rms * halfHeight;
        const qreal rmsBottomY = centerY + rms * halfHeight;
        if (x == 0) {
            peakTop.moveTo(px, peakTopY);
            peakBottom.moveTo(px, peakBottomY);
            rmsTop.moveTo(px, rmsTopY);
            rmsBottom.moveTo(px, rmsBottomY);
        } else {
            peakTop.lineTo(px, peakTopY);
            peakBottom.lineTo(px, peakBottomY);
            rmsTop.lineTo(px, rmsTopY);
            rmsBottom.lineTo(px, rmsBottomY);
        }
    }

    painter.setRenderHint(QPainter::Antialiasing, true);
    painter.setPen(QPen(kPeakColor(), 1.0));
    painter.drawPath(peakTop);
    painter.drawPath(peakBottom);
    painter.setPen(QPen(kRmsColor(), 1.4));
    painter.drawPath(rmsTop);
    painter.drawPath(rmsBottom);
    painter.setRenderHint(QPainter::Antialiasing, false);

    if (clipCount > 0) {
        painter.setPen(QPen(kClipColor(), 1.0));
        for (int x = 0; x < m_columns.size(); ++x) {