QT使用画家设置背景图片

protected:
void paintEvent(QPaintEvent*);

void Pet::paintEvent(QPaintEvent*)
{
    //重写自动执行
    QPixmap pixmap = QPixmap("./images/background.jpg").scaled(this->size());
    QPainter painter(this);
    painter.drawPixmap(this->rect(), pixmap);      //画家画图片

}