<![CDATA[QLogValueAxis doesn't show up help]]>I have some Problems with the log axis.
The axis doesn't show up
Anyone any idea ?

// Here i set up the charts -> 2 Charts
    QChart *Buger = new QChart();
    Buger->legend()->setVisible(true);
    QChart *BugerFlux = new QChart();
    BugerFlux->legend()->setVisible(true);

//Here i set up the X Axis which with a DateTimes
    QDateTimeAxis *axisX = new QDateTimeAxis;
    axisX->setFormat("dd MMM yyyy - hh:mm");
    axisX->setTitleText("Time Step");
    Buger->addAxis(axisX, Qt::AlignBottom);

// This is the same Axis for the second chart
    QDateTimeAxis *axisXflux = new QDateTimeAxis;
    axisXflux->setFormat("dd MMM yyyy - hh:mm");
    axisXflux->setTitleText("Time Step");
    BugerFlux->addAxis(axisXflux, Qt::AlignBottom);

// Here i set up a normal value axis as Y axis for the first Chart which works fine (the second chart is the Problem)
    QValueAxis *axisY = new QValueAxis;
    axisY->setTitleText("Mean Speed [<html>kms<sup>-1</sup></html>]");
    Buger->addAxis(axisY, Qt::AlignLeft);

//Here i want to set up the Log Axis 
    QLogValueAxis *axisYflux = new QLogValueAxis;
    axisYflux->setLabelFormat("%g");
    axisYflux->setTitleText("Values");
    axisYflux->setBase(10.0);
    BugerFlux->addAxis(axisYflux, Qt::AlignLeft); // Here i add it to the QChart

// Here i set up the Series in a (It depends how many the user has selected) MicronStatus is a vector with true or 
// False  

 for(int m =0;m<MicronStatus.size();m++)
            {
                    QLineSeries *bugerseries1 = new QLineSeries();
                    QLineSeries *bugerseriesFlux = new QLineSeries();

                    if(MicronStatus[m]==true) //If the Status is True 
                    {

                    for(int i = 0 ; i<value[m].size();i++)
                        {
                              bugerseries1->append(AllStepDatesAsQDatetime[i].toMSecsSinceEpoch(), value[m][i])
                        }

                    for(int i = 0 ; i<value2[m].size();i++)
                        {
                          bugerseriesFlux->append(AllStepDatesAsQDatetime[i].toMSecsSinceEpoch(), value2[m][i])
                        }
                             bugerseries1->setColor(Qt::red);
                             bugerseries1->setName("1");
                             bugerseriesFlux->setColor(Qt::red);
                             bugerseriesFlux->setName("1");

                    }
                   
// This is maybe the Problem :/
                    BugerFlux->addSeries(bugerseriesFlux);
                    bugerseriesFlux->attachAxis(axisXflux);
                    bugerseriesFlux->attachAxis(axisYflux);

                        Buger->addSeries(bugerseries1);
                        bugerseries1->attachAxis(axisX);
                        bugerseries1->attachAxis(axisY);

                }
                    
            }

            axisY->setRange(0,maxplotvalue+maxplotvalue/4);
            Buger->addAxis(axisY, Qt::AlignLeft);

           BugerFlux->addAxis(axisYflux, Qt::AlignLeft); // Or this could be the Problem 

            QChartView *BugerView = new QChartView(Buger);
            BugerView->setRenderHint(QPainter::Antialiasing);
            QChartView *BugerViewFlux = new QChartView(BugerFlux);
            BugerView->setRenderHint(QPainter::Antialiasing);
]]>https://forum.qt.io/topic/85975/qlogvalueaxis-doesn-t-show-up-helpRSS for NodeThu, 04 Jun 2026 12:49:05 GMTThu, 14 Dec 2017 17:29:19 GMT60