QPen(QColor(11,67,127),3));
QRectF rect(40.0, 40.0, 100.0, 100.0);
painter.setRenderHint(QPainter:: Antialiasing...QPainter painter(this);
painter.setRenderHint(QPainter:: Antialiasing, true); //设置渲染,启动反锯齿
painter.setPen...QPen(QColor(11,67,127),3));
QRectF rect(40.0, 40.0, 100.0, 100.0);
painter.setRenderHint(QPainter:: Antialiasing...QPen(QColor(11,67,127),3));
QRectF rect(40.0, 40.0, 100.0, 100.0);
painter.setRenderHint(QPainter:: Antialiasing