在QGraphicsView上实现交互式样条曲线的最佳方式是什么？

QGraphicsPathItem *pathItem = new QGraphicsPathItem;
scene->addItem(pathItem);

QPainterPath path;
pathItem->setPath(path);

void MyGraphicsView::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        QPainterPath path = pathItem->path();
        path.moveTo(event->pos());
        pathItem->setPath(path);
    }
}

void MyGraphicsView::mouseMoveEvent(QMouseEvent *event)
{
    if (event->buttons() & Qt::LeftButton) {
        QPainterPath path = pathItem->path();
        path.lineTo(event->pos());
        pathItem->setPath(path);
    }
}

void MyGraphicsView::mouseReleaseEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        QPainterPath path = pathItem->path();
        path.lineTo(event->pos());
        pathItem->setPath(path);
    }
}

void MyGraphicsView::mousePressEvent(QMouseEvent *event)
{
    if (event->button() == Qt::LeftButton) {
        QPainterPath path = pathItem->path();
        path.cubicTo(event->pos(), event->pos(), event->pos());
        pathItem->setPath(path);
    }
}