painter.setBrush(QBrush(Qt::blue,Qt::Dense3Pattern))
painter.setBrush(Qt::blue)
Qt帮助文档是这样的:
void QPainter::setBrush(const QBrush &brush)
Sets the painter's brush to the given brush.
The painter's brush defines how shapes are filled.
See also brush() and Settings.
void QPainter::setBrush(Qt::BrushStyle style)
This is an overloaded function.
Sets the painter's brush to black color and the specified style.