It looks that text is much bigger when in print preview.

when I print preview the QGraphicsItem object, it looks that text is bigger. But print the QGraphicsItem object, the text is normal;
Code:
void CTextItem::paint(QPainter *painter, const QStyleOptionGraphicsItem *option, QWidget *widget)
{
painter->save();
painter->setPen(m_fontColor);
painter->setFont(m_font)
painter->drawText(Geometry(), Qt::AlignCenter , m_strText);
painter->restore();
}