如何绘制带有圆角的QPixmap？

Question

我继承了QGraphicsPolygonItem，想在该项目的顶部绘制一个QPixmap。项目本身和像素图应绘制有圆角。

你怎么会这样

Answer 1

如果要绘制带有圆角的QPixmap，则在paint事件内部从QPixmap创建QBrush并将其应用到绘画器，如下所示：

painter->setRenderHint(QPainter::Antialiasing, true);
QBrush brush = QBrush(pixmap);
painter->setBrush(brush);
painter->drawRoundedRect(polygon().boundingRect(), 5, 5);