scrollArea = new QScrollArea();

        auto scrolledPlotArea = new QWidget(scrollArea);

        scrollArea->setWidget(scrolledPlotArea);

        scrollArea->setWidgetResizable(true);

        _plotArea->setLayout(new QVBoxLayout());

        _plotArea->layout()->addWidget(scrollArea);

        layout = new QVBoxLayout(scrolledPlotArea);

    }

    else

    {

        // delete scrollArea left from multi layout

        if (scrollArea != NULL) delete scrollArea;

        layout = new QVBoxLayout(_plotArea);

    }

    layout->setSpacing(1);

}

Plot* PlotManager::addPlotWidget()

{

    auto plot = new Plot();

    plotWidgets.append(plot);

    layout->addWidget(plot);

    return plot;

}

void PlotManager::addCurve(QString title, FrameBuffer* buffer)

{

    Plot* plot;

    if (isMulti)

    {

        // create a new plot widget

        plot = addPlotWidget();

    }

    else

    {

        plot = plotWidgets[0];

    }

    // create the curve

    QwtPlotCurve* curve = new QwtPlotCurve(title);

    curves.append(curve);

    curve->setSamples(new FrameBufferSeries(buffer));

    unsigned index = curves.size()-1;

    curve->setPen(Plot::makeColor(index));

    curve->attach(plot);

    plot->replot();

}

void PlotManager::removeCurves(unsigned number)

{

    for (unsigned i = 0; i < number; i++)

    {

        if (!curves.isEmpty())

        {

            delete curves.takeLast();

            if (isMulti) // delete corresponding widget as well

            {

                delete plotWidgets.takeLast();

            }

        }

    }

}

unsigned PlotManager::numOfCurves()

{

    return curves.size();

}

void PlotManager::setTitle(unsigned index, QString title)

{

    curves[index]->setTitle(title);

    plotWidget(index)->replot();

}

Plot* PlotManager::plotWidget(unsigned curveIndex)

{

    if (isMulti)

    {

        return plotWidgets[curveIndex];

    }

    else

    {

        return plotWidgets[0];

    }

}

void PlotManager::replot()

{

    {

    }

}