QPainter使用不同风格的QBrush来填充区域

效果图： 

void WgtText::paintEvent(QPaintEvent *event)

{

    QPainter painter(this);

    painter.setRenderHint(QPainter::Antialiasing, true);

    painter.setBrush(QBrush(Qt::blue, Qt::CrossPattern));

    painter.drawRect(10,10,300,300);

    return QWidget::paintEvent(event);

}