QtCharts recalculate/update axis for new series values

pauledd

Hi

I have a slot function updatePlot(...) that receives a QVector<double> and iterates through the vector data
and fills a series which has been cleared prior.

{
...
    ls = new QLineSeries();
    chart = new QChart();
    xAxis = new QValueAxis;
    yAxis = new QValueAxis;
    cv = new QChartView(chart);

    chart->addSeries(ls);
    chart->addAxis(xAxis, Qt::AlignBottom);
    chart->addAxis(yAxis, Qt::AlignLeft);
    ls->attachAxis(xAxis);
    ls->attachAxis(yAxis);
...
}
...
void PlotWindow::updatePlot(const QVector<double> &dat)
{
    ls->clear();
    for(int i=0;i<dat.size();i++){
	ls->append(i,dat.at(i));
    }
}

The problem of course is now that the data changes x and y ranges every time, but the axes
stay at the same range. What is the proper way to recalculate the x/y axes ranges?

Do I have to take care of it and calculate the high/low values in the for loop or is there a function in the qtcharts that does this for me?

pauledd

so for now I use this which seems to work...

xAxis->setRange(0,dat.size());
yAxis->setRange(*std::min_element(dat.constBegin(),dat.constEnd()),*std::max_element(dat.constBegin(),dat.constEnd()));