QChart Questions

I am creating a simple chart application:

* Create chart with two series using a value y-axis and a datetime x-axis
* Add data to the chart via a timer
* Scale the chart manually when data is added using setRange

The issues I'm having are:

* In general, I don't call createdefaultaxes()...I can't get the x-axis to adjust ever using setRange of setMax...why?
* I've tried updating the chartview as well...still no update

This is the chart setup:

Code:

---

// Create line series
    ser1 = new QLineSeries();
    ser2 = new QLineSeries();
 
    // Create chart
    chart = new QChart();
    chart->addSeries(ser1);
    chart->addSeries(ser2);
    chart->legend()->hide();
    chart->setTitle("Test Chart");
    //chart->createDefaultAxes();
 
    QDateTimeAxis *axisX = new QDateTimeAxis;
    axisX->setTickCount(10);
    axisX->setFormat("MM-dd-yy hh:mm:ss");
    axisX->setLabelsAngle(-90);
    axisX->setTitleText("Date");
    //chart->addAxis(axisX, Qt::AlignBottom);
    chart->setAxisX(axisX);
    chart->axisX()->setRange(QDateTime::currentDateTime(), QDateTime::currentDateTime().addSecs(15));
    ser1->attachAxis(axisX);
    ser2->attachAxis(axisX);
 
    QValueAxis *axisY = new QValueAxis;
    axisY->setLabelFormat("%i");
    axisY->setTitleText("Values");
    //chart->addAxis(axisY, Qt::AlignLeft);
    chart->setAxisY(axisY);
    chart->axisY()->setRange(-2, 2);
    ser1->attachAxis(axisY);
    ser2->attachAxis(axisY);
 
    // createDefaultAxes() - critical for autoscaling
    //chart->createDefaultAxes();
    //chart->setAxisX(axisX);
    //chart->setAxisY(axisY);
    //chart->axisX()->setRange(QDateTime::currentDateTime(), QDateTime::currentDateTime().addSecs(15));
    //chart->axisY()->setRange(-2, 2);
    //ser1->attachAxis(axisX);
    //ser2->attachAxis(axisX);
    //ser1->attachAxis(axisY);
    //ser2->attachAxis(axisY);
 
    // Setup view
    chartView = new QChartView(chart);
    chartView->setRenderHint(QPainter::Antialiasing);
    ui->vLayout->addWidget(chartView);
    chartView->setUpdatesEnabled(true);

---

This is the timer:

Code:

---

void MainWindow::AddData()
{
    static int data = 0;
 
    ++data;
    if (data > 359) {
        data = 0;
    }
    ser1->append(QDateTime::currentDateTime().toMSecsSinceEpoch(), qSin(qDegreesToRadians(double(data))));
    ser2->append(QDateTime::currentDateTime().toMSecsSinceEpoch(), qCos(qDegreesToRadians(double(data))));
    // Rescale
    QVector<QPointF> vec(ser1->pointsVector());
    std::sort(vec.begin(), vec.end(), xLessThan);
    chart->axisX()->setRange(vec.first().x(), vec.last().x());
    chart->axisX()->setMax(vec.last().x());
    chartView->update();
    //ui->vLayout->update();
    qDebug() << "Added data for " << data << " : " << QDateTime::currentDateTime().toMSecsSinceEpoch();
    qDebug() << QString::number(long(vec.first().x())) << " : " << QString::number(long((vec.last().x())));
}

---

---

Added after 58 minutes:

Disregard...wrong units! The chart xAxis is data time but the series values are epoch cnt:

QVector<QPointF> vec(ser1->points().toVector());
std::sort(vec.begin(), vec.end(), xLessThan);
chart->axisX()->setMax(QDateTime::fromMSecsSinceEpoch(vec.last(). x()).addSecs(15));