How to hide some of the categories in QBarCategoryAxis in Qt

Question

I did not find a way to hide some of the categories in QBarCategoryAxis when I create a chart. If I do not specify the category for axis, by default the categories will be like from 1 to QBarSet size. If I specify the category, how am I able to only display some of the categories in axis. For example: how to only display the first and last categories and the category in the middle in QBarCategoryAxis?

Edit:
Currently what I get is like this:

I have one QBarSet which has 6 elements. And I did not set the category text, so by default those category texts are from 1 to 6. what I want is to display some of the category texts, like to only display 1, 3, 6 and the rest of the text(2, 4, 5) are hidden.

Why I want to do this?
Because when the QBarSet has more elements and when I specify the category texts by myself, usually I need to maximize the window so I can see all the category texts which are displayed in the axisX. But I just want the chart to have a fixed size, so as for the texts, I just want a part of them are being displayed.
BTW, this will be what looks like if a bar set has lots of elements, and the texts below will not be full displayed until I maximize the window.
Edit 2:
This is what I want I want the chart looks like:

As you can see, below the axis x, it only has 5 texts.

Answer 1

The following solution only works for the case in which you want to show dates in the X axis. The trick is to use QDateTimeAxis but to do this, create a fictitious QLineSeries that will have as values ​​the dates and in And anything else, then it will hide.

#include <QApplication>
#include <QtCharts>
QT_CHARTS_USE_NAMESPACE

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    QChartView w;

    QBarSet *set0 = new QBarSet("bar1");

    *set0 << 1 << 4 << 3 << 7 << 2 << 5 << 1 << 3 << 3 << 2 << 1 << 6 << 7 << 5;

    QDateTime from = QDateTime::currentDateTime();
    QLineSeries *ls = new QLineSeries; //fictitious series

    for(int i=0; i < set0->count(); i++){
        *ls << QPointF(from.addDays(i+1).toMSecsSinceEpoch(), 0);
    }

    QBarSeries *series = new QBarSeries;
    series->append(set0);

    QDateTimeAxis *axisX = new QDateTimeAxis;
    axisX->setFormat("MMMM dd");
    axisX->setGridLineVisible(false);
    QValueAxis *axisY = new QValueAxis;

    QChart *chart= new QChart;
    w.setChart(chart);
    chart->addSeries(series);
    chart->addSeries(ls);
    chart->setAxisX(axisX, ls);
    chart->setAxisY(axisY, series);
    ls->hide(); // hide serie

    w.show();

    return a.exec();
}