#include <QApplication>
#include <QtWidgets>

//------------------------------------------------------
class Window : public QWidget
{
public:
    Window()
    {
        m_textDoc.setUseDesignMetrics(true);
        QTextCursor cursor(&m_textDoc);
        QFont font("Arial");
        font.setPixelSize(12);
        font.setStretch(200);
        
        QTextCharFormat charFmt;
        charFmt.setFont(font);
        cursor.setCharFormat(charFmt);
        cursor.insertText("Hello world - please don't overlap!!!\n");

        //Try bigger text
        font.setPixelSize(36);
        charFmt.setFont(font);
        cursor.setCharFormat(charFmt);
        cursor.insertText("Bigger Text.");
    }
    QSize minimumSizeHint() const { return QSize(100, 100); }
    QSize sizeHint() const { return QSize(500, 200); }
    void paintEvent(QPaintEvent*)
    {
        QPainter painter(this);
        m_textDoc.drawContents(&painter);
    }
private:
    QTextDocument m_textDoc;
};

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