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virtual QImage render(qreal horizontalResolution = 72.0, qreal verticalResolution = 72.0, Rotation rotation = RotateBy0, const QRect& boundingRect = QRect()) const = 0;
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virtual QList< Link* > links() const { return QList< Link* >(); }
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virtual QString text(const QRectF& rect) const { Q_UNUSED(rect); return QString(); }