void ChartModel::appendData(QList<double> graphAttributes)
{
    int vecSize = vec_.size();

    // limit reached, remove first row and append new row
    if (vecSize == 100) {
        beginRemoveRows(QModelIndex(), 0, 1);
        vec_.removeAt(0);
        vecSize = vec_.size();
        endRemoveRows();
    }

    beginInsertRows(QModelIndex(), vecSize, vecSize+1);

    double xVal = vec_.size();
    QList<double> coordinates = {xVal, graphAttributes.at(0), graphAttributes.at(1)};
    qDebug() << coordinates;
    vec_.push_back(coordinates);

    endInsertRows();
}