QGraphicsItem to QPixmap

gistfile1.cpp

QPixmap GraphicsItem::toPixmap() const
{
    if (!scene()) {
        qWarning() << "[ControlItem::toPixmap] scene is null.";
        return QPixmap();
    }

    QRectF r = boundingRect();
    QPixmap pixmap(r.width(), r.height());
    pixmap.fill(QColor(0, 0, 0, 0));
    QPainter painter(&pixmap);
    //painter.setBrush(QBrush(QColor(0, 0, 0, 0)));
    painter.drawRect(r);
    scene()->render(&painter, QRectF(), sceneBoundingRect());
    painter.end();
    return pixmap;
}