Russian Qt Forum

void appp::paintEvent(QPaintEvent * /* event */)
{
    QPainter painter(this);
    painter.drawImage(QPoint(0, 0), *theImage);
}

void appp::initNewScreenShot(int xx, int yy, int ww, int hh)
{
    theImage = new QImage(ww, hh, QImage::Format_RGB32);
    theImage->fill(qRgb(0, 0, 0));

    QPainter p(theImage);
    p.drawPixmap(0, 0, ww, hh, QPixmap::grabWindow(QApplication::desktop()->winId(), xx, yy, ww, hh) );
    setGeometry(xx, yy, ww, hh);
}

        QPainter p1( theImage );
        p1.setPen(QPen(Qt::black, 3, Qt::SolidLine, Qt::RoundCap, Qt::RoundJoin));
        p1.setBrush(Qt::yellow);
        p1.drawPoint(endX,endY);
        p1.drawPath(path);
        p1.end();

        update();