Adjust the size of QGraphicstextItem

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hi, some help me,how can we adjust the size of QGraphistextitem...i reimplemented the QGraphicsTextitem and when i adjusted the bounding rect size..full text is not visibling ...please tell me how to adjust the size of that text to fix in rectitem...

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this is the code i tried

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class GraphicsTextItemSized : public QGraphicsTextItem
{
public:
GraphicsTextItemSized(QGraphicsItem* parent = 0);
GraphicsTextItemSized(const QString& text, QGraphicsItem* parent = 0);

QRectF boundingRect() const;
QString str;
QRectF adjustedrect;

 void forcedsize(qreal x1,qreal y1,qreal x2,qreal y2);

};
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#include "graphicstextitemsized.h"
#include <QtCore>
#include <QtGui>
#include <QGraphicsTextItem>

GraphicsTextItemSized::GraphicsTextItemSized(const QString &text, QGraphicsItem *parent):QGraphicsTextItem(text,parent)
{
setPlainText( text);
}
QRectF GraphicsTextItemSized::boundingRect() const
{
return (adjustedrect);
}

void GraphicsTextItemSized::forcedsize(qreal x1,qreal y1,qreal x2,qreal y2)
{
adjustedrect.setCoords(0,0,x2-x1,y2-y1);
}

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QGraphicsRectItem *rect = new QGraphicsRectItem(0,0,0,0);
GraphicsTextItemSized *tes = new GraphicsTextItemSized(QString("vcc"),rect);
tes->forcedsize(0,0,10,10);
tes->setPos(10.0,10.0);
scene->addItem(rect);
@