QwtPolar change scale steps problem

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void Scale::changedScale()
{
    // Zoom scale
//    if(qFuzzyCompare(m_cbScale->currentText().toDouble(), 600.0)) {
//        m_screen->zoom(QwtPointPolar(0, 0), MAX_DISPLAY_FACTOR);
//    } else {
//        m_screen->zoom(m_screen->zoomPos(), m_cbScale->currentText().toDouble() / 600.0);
//    }
    // Azimuth scale
    m_screen->setScale(QwtPolar::Azimuth, 360, 0, m_cbAzimuth->currentText().toDouble());
    // Distance scale
    m_scaleDiv.setLowerBound(0);
    m_scaleDiv.setUpperBound(m_cbScale->currentText().toDouble());
    m_scaleDiv.setTicks(QwtScaleDiv::MinorTick, getTicks(m_cbDistance->currentText().toDouble()));
    m_scaleDiv.setTicks(QwtScaleDiv::MediumTick, getTicks(m_cbDistance->currentText().toDouble()));
    m_scaleDiv.setTicks(QwtScaleDiv::MajorTick, getTicks(m_cbDistance->currentText().toDouble()));
    m_screen->setScaleDiv(QwtPolar::Radius, m_scaleDiv);
    m_screen->setScale(QwtPolar::Radius, 0, m_cbScale->currentText().toDouble());
 
    m_screen->replot();
}
 
QList<double> Scale::getTicks(double step) const
{
    QList<double> ticks;
    if(qFuzzyCompare(step, 0)) {
        return ticks;
    }
    for(double i = 0; i <= m_cbScale->currentText().toDouble(); i += step) {
        ticks.append(i);
    }
 
    return ticks;
}

void Scale::changedScale()
{
    // Zoom scale
//    if(qFuzzyCompare(m_cbScale->currentText().toDouble(), 600.0)) {
//        m_screen->zoom(QwtPointPolar(0, 0), MAX_DISPLAY_FACTOR);
//    } else {
//        m_screen->zoom(m_screen->zoomPos(), m_cbScale->currentText().toDouble() / 600.0);
//    }
    // Azimuth scale
    m_screen->setScale(QwtPolar::Azimuth, 360, 0, m_cbAzimuth->currentText().toDouble());
    // Distance scale
    m_scaleDiv.setLowerBound(0);
    m_scaleDiv.setUpperBound(m_cbScale->currentText().toDouble());
    m_scaleDiv.setTicks(QwtScaleDiv::MinorTick, getTicks(m_cbDistance->currentText().toDouble()));
    m_scaleDiv.setTicks(QwtScaleDiv::MediumTick, getTicks(m_cbDistance->currentText().toDouble()));
    m_scaleDiv.setTicks(QwtScaleDiv::MajorTick, getTicks(m_cbDistance->currentText().toDouble()));
    m_screen->setScaleDiv(QwtPolar::Radius, m_scaleDiv);
    m_screen->setScale(QwtPolar::Radius, 0, m_cbScale->currentText().toDouble());

    m_screen->replot();
}

QList<double> Scale::getTicks(double step) const
{
    QList<double> ticks;
    if(qFuzzyCompare(step, 0)) {
        return ticks;
    }
    for(double i = 0; i <= m_cbScale->currentText().toDouble(); i += step) {
        ticks.append(i);
    }

    return ticks;
}

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void Scale::changedScale()
{
    // Azimuth scale
    m_screen->setScale(QwtPolar::Azimuth, 360, 0, m_cbAzimuth->currentText().toDouble());
    // Distance scale
    m_screen->setScale(QwtPolar::Radius, 0, 600.0);
    double maxMajor = 600.0 / m_cbDistance->currentText().toDouble();
    m_screen->setScaleMaxMajor(QwtPolar::Radius,
                               qFuzzyCompare(maxMajor, static_cast<int>(maxMajor))
                               ? maxMajor : maxMajor + 1);
    // Zoom scale <-- This spoils everything!!!
    if(qFuzzyCompare(m_cbScale->currentText().toDouble(), 600.0)) {
        m_screen->zoom(QwtPointPolar(0, 0), MAX_DISPLAY_FACTOR);
    } else {
        m_screen->zoom(m_screen->zoomPos(), m_cbScale->currentText().toDouble() / 600.0);
    }
 
    m_screen->replot();
}

void Scale::changedScale()
{
    // Azimuth scale
    m_screen->setScale(QwtPolar::Azimuth, 360, 0, m_cbAzimuth->currentText().toDouble());
    // Distance scale
    m_screen->setScale(QwtPolar::Radius, 0, 600.0);
    double maxMajor = 600.0 / m_cbDistance->currentText().toDouble();
    m_screen->setScaleMaxMajor(QwtPolar::Radius,
                               qFuzzyCompare(maxMajor, static_cast<int>(maxMajor))
                               ? maxMajor : maxMajor + 1);
    // Zoom scale <-- This spoils everything!!!
    if(qFuzzyCompare(m_cbScale->currentText().toDouble(), 600.0)) {
        m_screen->zoom(QwtPointPolar(0, 0), MAX_DISPLAY_FACTOR);
    } else {
        m_screen->zoom(m_screen->zoomPos(), m_cbScale->currentText().toDouble() / 600.0);
    }

    m_screen->replot();
}

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