怎样让GraphicsItem 绕中心轴转动 [复制链接]

        setTransform(QTransform().rotate(angle,Qt::YAxis));

上面代码可以使Item 绕Y轴转动，我想Item 绕中心轴转动，不知道怎么实现，那位大侠帮帮忙阿！！！！！谢谢阿！！！！！

函数


void LauncherButton::animationRotating(int angle)
{

//        QPointF buttonPosParent = pos();
//        QPointF buttonPosfromParent = mapFromParent(buttonPosParent);
//        QPointF buttonSelfPos = mapToItem(this,buttonPosParent);
//        setTransformOriginPoint(boundingRect().center().x(),boundingRect().center().y());

        setTransform(QTransform().rotate(angle,Qt::YAxis));
//        Q_UNUSED(angle);
//        setTransform(QTransform().setMatrix(1,1,1,1,1,1,1,1,1));
}

void QGraphicsItem::setRotation ( qreal angle )
这个函数应该能实现围绕z轴旋转
The item is rotated around its transform origin point, which by default is (0, 0). You can select a different transformation origin by calling setTransformOriginPoint().
应该用setTransformOriginPoint()就能设定旋转点了吧

没测试过

先把坐标translate到图元的中心，再执行选择，在想反方向translate同样距离！