Trying to connect a signal so that when a login is validated in the main window class, a signal is inherited into a derived shape class to draw a line in a QEvent loop. However, the connect function is giving an error. No matching function for call to ‘connect’.

//Function for line paint event

    void Line::paintEvent(QPaintEvent *event)
{
    QPainter *myline = new QPainter(this);
    //QPainter myline(this);
    QPen linePen(Qt::green);

    linePen.setWidth(10);
    myline->setPen(linePen);

    QEventLoop loop;
    connect(myline, SIGNAL(shapeValue()), &loop, SLOT(quit()), Qt::QueuedConnection);

    loop.exec();

    QLineF line(10.0, 80.0, 90.0, 20.0);
    myline->drawLine(50, 50, 200, 200);
    show();


}