QBrush之材质画刷(Qt::BrushStyle::TexturePattern)

void Widget::paintEvent(QPaintEvent *event)
{
    Q_UNUSED(event);

    QPainter painter(this);

    painter.fillRect(this->rect(),QBrush(QColor(255,255,255)));
    painter.setRenderHint(QPainter::Antialiasing);//抗锯齿

    QBrush brush;
    brush.setColor(QColor(255,0,0));
    brush.setTexture(QPixmap("f:/root1.png"));
    painter.setBrush(brush);
    painter.drawEllipse(0,0,this->width(),this->height());
}