qt charts in qgridlayout

sieciech

Hi All,

i wanted to embedd example: http://doc.qt.io/qt-5/qtcharts-linechart-example.html into qtgridlayout:

here is constructor of QMainWindow:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    lcdNumber = new QLCDNumber();
    lcdNumber_2 = new QLCDNumber();
    progressBar = new QProgressBar();

    lcdNumber->display("wait...");
    m_progress = 0;
    progressBar->setMinimum(0);
    progressBar->setMaximum(59);
    progressBar->setValue(m_progress);

    TempChart *tChart = new TempChart();

    ui->gridLayout->addWidget(lcdNumber, 0, 0);
    ui->gridLayout->addWidget(lcdNumber_2, 0, 1);
    ui->gridLayout->addWidget(tChart, 1, 0, 1, 2);
    tChart->show();
}

and constructor of TempChart:

TempChart::TempChart(QWidget *parent) : QWidget(parent)
{
     QLineSeries *series = new QLineSeries();
     series->append(0, 6);
     series->append(2, 4);
     series->append(3, 8);
     series->append(7, 4);
     series->append(10, 5);

     QChart *chart = new QChart();
     chart->legend()->hide();
     chart->addSeries(series);
     chart->createDefaultAxes();
     chart->setTitle("Simple line chart example");
     chartView = new QChartView(chart);
     chartView->setRenderHint(QPainter::Antialiasing);
}

Once i exectue it im able to see lcdNumber and lcdNumber_2 on display, however im not able to see my chart on rest of screen. Any ideas why?

thx in advance for support
s.

raven-worx

@sieciech
because in your TempChart class you just create a QChartView widget without a parent nor do you add it to a layout.

sieciech

Thx!!!!

in fact when i changed:

ui->gridLayout->addWidget(tChart, 1, 0, 1, 2);

into:

ui->gridLayout->addWidget(tChart-> chartView, 1, 0, 1, 2);

and chart was present!
However lcd displays stopped recating on: lcdNumber->display(value), where value shall be updated each second....( previously, without chart it worked as it should). Any ideas?

regards
s.

raven-worx

@sieciech
i doubt that just adding it to a layout causes this issue.
But you also haven't posted any code how the updating of the QLCDNumber widgets actually works.