Method drawGrid

src/gui/WaveformWidget.cpp:797–859

}

void WaveformWidget::drawGrid(QPainter& painter,
                              const QRectF& plotRect,
                              int sampleRate) const
{
    Q_UNUSED(sampleRate);

    painter.save();

    if (showGrid()) {
        painter.setPen(QPen(kGridMinor(), 1.0));
        for (int i = 0; i <= 10; ++i) {
            const qreal x = plotRect.left() + plotRect.width() * i / 10.0;
            painter.drawLine(QPointF(x, plotRect.top()),
                             QPointF(x, plotRect.bottom()));
        }
    }

    const qreal centerY = plotRect.center().y();
    const qreal halfHeight = std::max<qreal>(1.0, plotRect.height() * 0.5 - 2.0);
    const int refs[] = {0, -6, -12, -24, -48};

    QFont labelFont = font();
    labelFont.setPointSizeF(std::max(7.0, labelFont.pointSizeF() - 2.0));
    painter.setFont(labelFont);

    for (int db : refs) {
        const qreal rawOffset = dbToAmplitude(static_cast<float>(db)) * m_amplitudeZoom * halfHeight;
        if (db <= -48 && rawOffset < 3.0)
            continue;
        const qreal offset = std::min(rawOffset, halfHeight);

        painter.setPen(QPen(db >= -12 ? kGridMajor() : kGridMinor(), 1.0));
        const qreal yTop = centerY - offset;
        const qreal yBottom = centerY + offset;
        if (rawOffset <= halfHeight + 0.5) {
            painter.drawLine(QPointF(plotRect.left(), yTop), QPointF(plotRect.right(), yTop));
            painter.drawLine(QPointF(plotRect.left(), yBottom), QPointF(plotRect.right(), yBottom));
        } else {
            painter.drawLine(QPointF(plotRect.left(), plotRect.top()),
                             QPointF(plotRect.right(), plotRect.top()));
            painter.drawLine(QPointF(plotRect.left(), plotRect.bottom()),
                             QPointF(plotRect.right(), plotRect.bottom()));
        }

        painter.setPen(kMutedLabel());
        painter.drawText(QRectF(plotRect.right() + 4.0, yTop - 7.0,
                                width() - plotRect.right() - 5.0, 14.0),
                         Qt::AlignLeft | Qt::AlignVCenter,
                         QString::number(db));
    }

    painter.setPen(QPen(kCenterLine(), 1.0));
    painter.drawLine(QPointF(plotRect.left(), centerY),
                     QPointF(plotRect.right(), centerY));

    painter.setPen(kMutedLabel());
    painter.drawText(QRectF(plotRect.right() + 4.0, plotRect.bottom() - 12.0,
                            width() - plotRect.right() - 5.0, 12.0),