#include <QApplication>
#include <QPainter>
#include <QTextLayout>
#include <QWidget>

class Widget : public QWidget {
public:
    Widget(QWidget *parent = 0, Qt::WindowFlags f = 0);
    QSize sizeHint() const;

protected:
    void paintEvent(QPaintEvent *);
};

Widget::Widget(QWidget *parent, Qt::WindowFlags f) :
    QWidget(parent, f)
{
}

QSize Widget::sizeHint() const
{
    return QSize(150, 50);
}

void Widget::paintEvent(QPaintEvent *)
{
    QPainter painter(this);
    QTextLayout layout;

    layout.setText("19.28.37.46");

    QTextOption textOption = layout.textOption();

    textOption.setAlignment(Qt::AlignHCenter);
    layout.setTextOption(textOption);

    qreal lineWidth = width();
    qreal height = 0;

    layout.beginLayout();

    forever {
        QTextLine line = layout.createLine();

        if (!line.isValid())
            break;

        line.setLineWidth(lineWidth);
        line.setPosition(QPointF(0, height));
        height += line.height();
    }

    layout.endLayout();

    QVector<QTextLayout::FormatRange> selections;
    QTextLayout::FormatRange formatRange;

    formatRange.start = 0;
    formatRange.length = 1;
    formatRange.format.setBackground(Qt::red);
    selections.append(formatRange);

    layout.draw(&painter, QPoint(0, 0), selections);
}

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);
    Widget widget;

    widget.show();

    return a.exec();
}