{

        QApplication b(argc, argv);
        QRect rec=QApplication::desktop()->screenGeometry();
        qDebug() << rec;
        int height=rec.height();
        int width=rec.width();

        float scalefactor=1;
        //calculate scale factor;
        if(height<500) {
            scalefactor=(float)height/480.0*0.85;
        }
        else {
            float maxwidth=(float)width/800.0;
            float maxheight=(float)height/480.0;

            if(maxheight>maxwidth)scalefactor=maxwidth;
            else scalefactor=maxheight;
            qDebug() << "Max Height:" << maxheight << "Max Width:" << maxwidth;
            scalefactor=scalefactor*0.95;



        }
        qDebug()<<"Scalefactor" << scalefactor << QString::number(scalefactor,'f',2).toUtf8();

        qputenv("QT_SCALE_FACTOR",QString::number(scalefactor,'f',2).toUtf8());

    }



    QApplication a(argc, argv);
    a.setAttribute(Qt::AA_EnableHighDpiScaling);
    a.setAttribute(Qt::AA_UseStyleSheetPropagationInWidgetStyles,true);