QT背景图片 [复制链接]

[pre]在qt中，我想达到的效果是：将背景图片插入到mainwindows中，并且背景图片的大小可以随着窗口的大小的变化而改变，始终占据整个窗口，请问应该怎么办？？QPalette pal;    pal.setBrush(this->backgroundRole(),QBrush(QPixmap("background.bmp")));    this->setPalette(pal);    this->setAutoFillBackground(true);这样做达不到效果 ，[pre]放大后显示出来的是接近四幅图啊，而且缩小窗口会遮住一部分的图片背景。[/pre][pre]本人刚学QT，请高手教我！！！[/pre][/pre]

。。。。。

重载resizeEvent，在事件中对图片进行scale，然后再绘制

我也这么觉得
实现图片循环滚动要写个类，插入背景图片要写好几行…我不知道是我没找到最简单方法还是本来就是这样？

有方便的方法吗？？？

可以考虑使用图片的缩放来做，
我是这样做的，
    resize(((200*m_file_index)%1280),((100*m_file_index)%720));
        update(0,0,width(),height());
{
    Q_UNUSED(pEvent);

    double wscale = 1.0;
    double hscale = 1.0;
    
    double pixwidth = static_cast<double>(m_image.width());
    double pixheight = static_cast<double>(m_image.height());
    double showwidth = static_cast<double>(width());
    double showheight = static_cast<double>(height());

    double Wscalerate = pixwidth / showwidth;
    double Hscalerate = pixheight / showheight;
    double compare = (Wscalerate > Hscalerate ? Wscalerate : Hscalerate);

    QRect _rect( showwidth/2.0 - pixwidth/compare/2.0,
                showheight/2.0- pixheight/compare/2.0,
                pixwidth/compare,
                pixheight/compare);

    QRect _midrect( (showwidth/2.0-pixwidth/2.0),
                   (showheight/2.0-pixheight/2.0),
                   pixwidth,
                   pixheight );

    QPainter painter(this);  

    painter.save();

    painter.translate(showwidth/2.0, (showheight/2.0));
    painter.scale(wscale, hscale);
    painter.translate(-(showwidth/2), -(showheight/2.0));

    if (compare < 1.0)
        painter.drawImage(_midrect, m_image);
    else
        painter.drawImage(_rect, m_image);
    
    painter.restore();
    //QPainter p(this);
    //p.drawImage((SCREEN_WIDTH-m_image.width())/2, (SCREEN_HEIGHT-m_image.height())/2,m_image);
}