Okay, and how can I stop it? I did not find object Qtimer. I need to stop imag

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Timer about realtimeplot HOT 1 CLOSED

filipecalasans commented on September 25, 2024

Timer

from realtimeplot.

Comments (1)

filipecalasans commented on September 25, 2024

Hi @Nikita-Presnov, the rendering period is statically defined and set on a timer using the QObjet API. Usually, we don't want to pause the rendering. Instead, I would recommend interacting with the data stream buffer.

Find below an example using the Qt API to manage the QObject timer. In the example, you will need to store the timer ID returned by the method startTimer as a member variable.

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow),
    refresh_timer_id(0)
{
    ui->setupUi(this);

    for(int i=0; i<POINT_STREAM_NUM; i++) {
        QSharedPointer<PointStream> stream(new PointStream());
        stream->setSamplesPerSeconds(1000/SAMPLE_GENERATION_PERIOD);
        dataPoints << stream;
        ui->plotArea->addPointStream(stream);
    }

    ui->plotArea->setWindowLengthInSeconds(4.0);

    refresh_timer_id = startRendering();
}


void MainWindow::pauseRendering() {
     killTimer(refresh_timer_id);
     refresh_timer_id = 0;
}


void MainWindow::startRendering() {
     if (refresh_timer_id == 0) {
         refresh_timer_id = startTimer(SAMPLE_GENERATION_PERIOD);
     }
}