Function snapToStep

src/gui/SpectrumWidget.cpp:5790–5795

Snap a frequency (MHz) to the nearest multiple of m_stepHz.

// Snap a frequency (MHz) to the nearest multiple of m_stepHz.
static double snapToStep(double mhz, int stepHz)
{
    if (stepHz <= 0) return mhz;
    const double stepMhz = stepHz / 1e6;
    return std::round(mhz / stepMhz) * stepMhz;
}

void SpectrumWidget::mousePressEvent(QMouseEvent* ev)
{