问如何在不干扰形状的情况下重新缩放GraphicItems？

EN

QList<QGraphicsItem*> items;

    for (auto it : items)
    {
        qreal scale = 1.75;

        QPointF c = it->mapToScene(it->boundingRect().center());
        it->setScale(scale);
        QPointF cNew = it->mapToScene((it->boundingRect()).center());
        QPointF offset = c - cNew;
        it->moveBy(offset.x(), offset.y());

    }