QDateTimeAxis not rendering labels when manually setting range

Barronj

Hello,

I'm trying QCharts for the first time using version 5.7 that I compiled on a CentOS 7 machine. There are several time series that contain different time periods that should share both the X and Y axes. I tried to attach each axis to all the series, but that just had the plot adjust to one series instead of zoom fitting to show them all. This was a problem for both the X and Y axes. So then I tried to set the range for each axis, but the QDateTimeAxis then doesn't render. The Y axis renders fine, though.

Here is some example code:

void Plot::beginPlotting() {
    chart()->removeAllSeries();

    if (axisX != nullptr) {
        chart()->removeAxis(axisX);
        axisX->deleteLater();
        axisX = nullptr;
    }

    if (axisY != nullptr) {
        chart()->removeAxis(axisY);
        axisY->deleteLater();
        axisY = nullptr;
    }

    series    = nullptr;
    boundsSet = false;
}

void Plot::beginSeries() {
    if (series != nullptr) {
        chart()->addSeries(series);
    }

    series = new QLineSeries;

    QPen pen(QRgb(0x00B2EE));
    series->setPen(pen);
}

void Plot::addPoint(qint64 time, double value) {
    if (series != nullptr) {
        time *= 1000;
        series->append(time, value);

        if (!boundsSet) {
            minVal    = value;
            maxVal    = value;
            minTime   = time;
            maxTime   = time;
            boundsSet = true;
        }
        else {
            if (minTime > time) { minTime = time; }
            if (maxTime < time) { maxTime = time; }
            if (minVal > value) { minVal = value; }
            if (maxVal < value) { maxVal = value; }
        }
    }
}

void Plot::endPlotting() {
    if (series != nullptr) {
        chart()->addSeries(series);
        series = nullptr;
    }

    axisX = new QDateTimeAxis;
    axisX->setTickCount(10);
    axisX->setFormat("hh:mm:ss");
    axisX->setTitleText("Date");

    chart()->addAxis(axisX, Qt::AlignBottom);

    axisY = new QValueAxis;
    axisY->setLabelFormat("%3.1lf");
    axisY->setTitleText("Value");

    chart()->addAxis(axisY, Qt::AlignLeft);

    /*
    foreach (QAbstractSeries *series, chart()->series()) {
        series->attachAxis(axisX);
        series->attachAxis(axisY);
    }
    */

    if (boundsSet) {
        QDateTime min, max;

        min.setMSecsSinceEpoch(minTime);
        max.setMSecsSinceEpoch(minTime);
        axisX->setRange(min, max);
        axisY->setRange(minVal, maxVal);
    }
}

Barronj

Found the error. Used minTime to set both min and max. Sorry to bother you with my stupid mistake.