...
p->rotate(m_rotation);
lg.setColorAt(1,Qt::transparent);
lg.setColorAt(0,Qt::black);
QPen gp
= QPen(Qt
::black,
20, Qt
::SolidLine, Qt
::SquareCap,Qt
::RoundJoin);
p->setPen(gp);
p->drawRect(0,0,200,200);
...
...
p->rotate(m_rotation);
QLinearGradient lg=QLinearGradient(QPointF(0,0),QPointF(200,200));
lg.setColorAt(1,Qt::transparent);
lg.setColorAt(0,Qt::black);
QPen gp = QPen(Qt::black, 20, Qt::SolidLine, Qt::SquareCap,Qt::RoundJoin);
gp.setBrush(QBrush(lg));
p->setPen(gp);
p->drawRect(0,0,200,200);
...
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