How to plot a simple function with QDateTime X axis and int/double Y axis?

[falconium]

I solved it, please, find it here for future reference:

QwtScaleDiv ChartPlot::scaleDiv()
{
    QList<double> ticks[QwtScaleDiv::NTickTypes];
 
    QList<double> &majorTicks = ticks[QwtScaleDiv::MajorTick];
 
    foreach (double val, xData)
        majorTicks += val;
 
    if (xData.count()>1)
    {
        QList<double> &mediumTicks = ticks[QwtScaleDiv::MediumTick];
        for (int i = 0; i < xData.count() - 1; i++)
            for (int j = 1; j < 6; j++)
                mediumTicks += xData[i] + j * (xData[i+1] - xData[i]) / 5;
 
        QList<double> &minorTicks = ticks[QwtScaleDiv::MinorTick];
        for (int i = 0; i < xData.count()*10 - 1; i++)
            for (int j = 1; j < 11; j++)
                minorTicks += xData[i] + j * (xData[i+1] - xData[i]) / 10;
    }
 
    return QwtScaleDiv(xData.first(), xData.last(), ticks);
}

QwtScaleDiv ChartPlot::scaleDiv()
{
    QList<double> ticks[QwtScaleDiv::NTickTypes];

    QList<double> &majorTicks = ticks[QwtScaleDiv::MajorTick];

    foreach (double val, xData)
        majorTicks += val;

    if (xData.count()>1)
    {
        QList<double> &mediumTicks = ticks[QwtScaleDiv::MediumTick];
        for (int i = 0; i < xData.count() - 1; i++)
            for (int j = 1; j < 6; j++)
                mediumTicks += xData[i] + j * (xData[i+1] - xData[i]) / 5;

        QList<double> &minorTicks = ticks[QwtScaleDiv::MinorTick];
        for (int i = 0; i < xData.count()*10 - 1; i++)
            for (int j = 1; j < 11; j++)
                minorTicks += xData[i] + j * (xData[i+1] - xData[i]) / 10;
    }

    return QwtScaleDiv(xData.first(), xData.last(), ticks);
}

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