QChart Multiple Lines with QString as X Axis instead of double values

[BadHombre]

Hi Guys,

I want to create a chart with Dates as X Axis instead of values.
I tried it with category like in this example http://doc.qt.io/qt-5/qtcharts-lineandbar-example.html but the problem is that the Q String arent on the exact Position where the Point of the line is ... because it is for bar charts...
I hope that sb has an idea.

This is my code :

            Buger->createDefaultAxes();
            Buger->axisX()->setTitleText("Time Step");
            QStringList categories;
            categories << "Jan" << "Feb" << "Mar" << "Apr" << "May" << "Jun";
            QBarCategoryAxis *axisX = new QBarCategoryAxis();
            axisX->append(categories);
            Buger->setAxisX(axisX);
            Buger->axisY()->setTitleText("Speed [km/s]");
            

Thanks in advance !

[JonB]

@BadHombre

I want to create a chart with Dates as X Axis instead of values

Then instead of QBarCategoryAxis what about QDateTimeAxis (https://doc.qt.io/qt-5/qdatetimeaxis.html)?

[BadHombre]

Thanks for the Solution ... but i have one additional question :

i created now chart with the QDateTime example ...
my Problem now is that it takes random date time values for the x axis ... but i want that it takes exactly the datetimes which i added to the series...

any idea ?

 QDateTimeAxis *axisX = new QDateTimeAxis;
                        //axisX->setTickCount(AllStepDatesAsQDatetime.size());
                        axisX->setFormat("MMM:dd:yyyy - hh:dd");
                        axisX->setTitleText("Date");
                        axisX->
                        Buger->addAxis(axisX, Qt::AlignBottom);
                        bugerseries1->attachAxis(axisX);

[JonB]

@BadHombre
As you can see from the docs of QDateTimeAxis, it has a (settable) number of "ticks", which I imagine correspond to (regulary-spaced) labels, and you cannot make it only produce ticks where you have plotted points. I don't know whether you can override its axis stuff and do your own.

If you revert to QBarCategoryAxis, I don't know exactly where it places the label text anyway, but in any case everything will be regularly-spaced, which then won't correspond to the actual "gap" between dates.

So far as I can see, all the axis-types work by regularly-spaced ticks, I don't think you can alter that or control exactly where the tick/label is placed. Unless, that is, an expert know better....