Qt tip qlabel 如何设置图片，图片大小设置为qlabel等同大小

ゝ一纸荒年。 2022-07-17 04:18 770阅读 0赞

*  设置qlabel填充图片，并且将一张图片大小宽高设置为qlabel的边框宽高的大小。

ui->dangqian\_tianqi\_img\_label->width() //为qlabel的宽  
ui->dangqian\_tianqi\_img\_label->height() //为qlabel的高

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QPixmap tianqi_pixmap(":/img/ico/qing.png");
    //qDebug() << tianqi_pixmap.width() << " /" << tianqi_pixmap.height();
    tianqi_pixmap = tianqi_pixmap.scaled(ui->dangqian_tianqi_img_label->width(), ui->dangqian_tianqi_img_label->height(),
                                        Qt::IgnoreAspectRatio, Qt::SmoothTransformation);//设置图片大小和label的长宽一致
    ui->dangqian_tianqi_img_label->setPixmap(tianqi_pixmap);
    ui->dangqian_tianqi_img_label->show();

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![这里写图片描述][20160831112033919]

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void Login::set_top_img(bool isSandom, int index_img)
    {
        //427 185
        int set_index_img = 1;
        if(isSandom == true)//随机显示topimg
        {
    
            QTime time_sand;
            time_sand= QTime::currentTime();//获取当前时间
            qsrand(time_sand.msec()+time_sand.second()*1000);
    
            //index_img = qrand()%5 ;//在0-4中选出随机数
            set_index_img = qrand()%5 + 1 ;//在1-5中选出随机数
    
        }
        if(isSandom == false) //不随机显示，按index_img显示图片s
        {
            set_index_img = index_img;
        }
    
        QString top_img_path=":/images/top_img1.png";
        qDebug()<< " [leo]" << top_img_path;
        QImage top_img;
        top_img_path = ":/images/top_img" + QString::number(set_index_img, 10)  + ".png";
        qDebug()<< " [leo]" << top_img_path;
        top_img.load(top_img_path);
        QPixmap top_pic=QPixmap::fromImage(top_img.scaled(ui->label_top_img->width(),ui->label_top_img->height()));
        ui->label_top_img->setPixmap(top_pic);
        qDebug() << " [leo]top_img width heigh:" << ui->label_top_img->width()
                 << " " << ui->label_top_img->height();
    }

[20160831112033919]: /images/20220717/8358773660fc4c1a8c720eb06be0c177.png