void MainWindow::setupRealtimeDataDemo(QCustomPlot *customPlot)
{
customPlot->addGraph(); // blue line
customPlot->graph(0)->setPen(QPen(Qt::blue));
customPlot->graph(0)->setBrush(QBrush(QColor(240, 255, 200)));
customPlot->graph(0)->setAntialiasedFill(false);

customPlot->addGraph(); // blue dot
customPlot->graph(1)->setPen(QPen(Qt::blue));
customPlot->graph(1)->setLineStyle(QCPGraph::lsNone);
customPlot->graph(1)->setScatterStyle(QCPScatterStyle::ssDisc);

QSharedPointer<QCPAxisTickerTime> timeTicker(new QCPAxisTickerTime);
timeTicker->setTimeFormat("%h:%m:%s");
customPlot->xAxis->setTicker(timeTicker);
customPlot->axisRect()->setupFullAxesBox();
customPlot->yAxis->setRange(-40, 40);

connect(customPlot->xAxis, SIGNAL(rangeChanged(QCPRange)), customPlot->xAxis2, SLOT(setRange(QCPRange)));
connect(customPlot->yAxis, SIGNAL(rangeChanged(QCPRange)), customPlot->yAxis2, SLOT(setRange(QCPRange)));

connect(&dataTimer, SIGNAL(timeout()), this, SLOT(realtimeDataSlot()));
dataTimer.start(0);
}

void MainWindow::realtimeDataSlot()
{

std::uniform_real_distribution<double>distribution(1,20.5);
    double value1 = distribution(*QRandomGenerator::global());
    qDebug() << value1;
    while(value1 !=0)
    {
        value1=distribution(*QRandomGenerator::global());
        qDebug() << value1;

    }


static QTime time(QTime::currentTime());
double key = time.elapsed()/1000.0; 
static double lastPointKey = 0;
if (key-lastPointKey > 0.002) // at most add point every 2 ms
{
  ui->customPlot->graph(0)->addData(key, value1);
  ui->customPlot->graph(1)->addData(key, value1);
  lastPointKey = key;
}
ui->customPlot->xAxis->setRange(key, 8, Qt::AlignRight);
ui->customPlot->replot();

}