#include <QtWidgets>

class Widget : public QWidget
{
    void paintEvent(QPaintEvent* event)
    {
        QPainter p(this);
        p.rotate(-90);
        p.translate(-height(), 0);

        QRect transposed(0, 0, height(), width());
        p.drawText(transposed, Qt::AlignCenter, "Vertical text looks bad on Mac");
    }
};

int main(int argc, char* argv[])
{
    QApplication app(argc, argv);
    Widget w;
    w.show();
    return app.exec();
}