How to set definite Scene Rect in QGraphicsView.

Hi All,
I am developing a application in which I am adding no of items into the scene. I know that by default view shows the item in the center. thats fine with my application. Now when I try to animate the items with setPosAt to move the items all the items gets togather at the center of the view overlapping eachother. I think this is the problem with SceneRect. Now I need to set the definitive scene rect . I have tried it to set using setSceneRect but it doesn't worked. Can anyone please help me out. Do I need to subclass QGraphicsScene class inorder to override setSceneRect.

Thanks and Advance.

I dont think its prob with scene rect.
You might be making some mistake while placing the items. Can we see what u are trying ??

Thanks for your reply..
Here is the code.. Can you please tell me how can I scale the two rects at the center.

Code:

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#include <QtGui/QApplication>
#include "animation.h"
#include <QGraphicsScene>
#include <QGraphicsView>
#include <QGraphicsItemAnimation>
#include <QGraphicsEllipseItem>
#include <QTimeLine>
#include "windows.h"
 
int main(int argc, char *argv[])
{
	QApplication a(argc, argv);
	//Animation w;
	//w.show();
 
	QGraphicsRectItem *ball = new QGraphicsRectItem(150, 150, 100, 100);
	ball->setBrush(QBrush(QColor(255,0,0)));
	QGraphicsEllipseItem *ecl = new QGraphicsEllipseItem(150, 150, 20, 20);
	ecl->setBrush(QBrush(QColor(0,255,0)));
	QGraphicsRectItem *Rect = new QGraphicsRectItem(200, 175, 100, 50);
	Rect->setBrush(QBrush(QColor(0,0,255)));
	Rect->setZValue(-1);
 
     QTimeLine *timer = new QTimeLine(15000);
     timer->setFrameRange(0, 100);
 
     QGraphicsItemAnimation *animation = new QGraphicsItemAnimation;
     animation->setItem(ball);
	 animation->setTimeLine(timer); 
 
	 QGraphicsItemAnimation *animation1 = new QGraphicsItemAnimation;     
	 animation1->setItem(Rect);
     animation1->setTimeLine(timer); 
 
 
	 QGraphicsScene *scene = new QGraphicsScene();     
     scene->addItem(ball);
	 //scene->addItem(ecl);
	 scene->addItem(Rect);
 
 
	 QGraphicsView *view = new QGraphicsView(scene);
	 view->setAlignment(Qt::AlignCenter);
	 view->setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOff);
	 view->setVerticalScrollBarPolicy(Qt::ScrollBarAlwaysOff);	
	 view->setGeometry(10,10,900,700);
	view->show();
 
	 //timer->start();
 
	 QRectF rc = ball->mapToScene(ball->boundingRect()).boundingRect();
	 QRectF rc1 = ecl->mapToScene(ecl->boundingRect()).boundingRect();
	 QRectF rc2 = Rect->mapToScene(Rect->boundingRect()).boundingRect();
 
     for (int i = 0; i < 200; ++i)
	 {
		//animation->setTranslationAt(i/200.0, rc.width()/2.0,rc.height()/2.0);
		animation->setScaleAt(i/200.0, 1 + i/200.0, 1 + i/200.0);		
		//animation->setTranslationAt(i/200.0, -( rc.width()/2.0 + i/200.0), -rc.height()/2.0);
		animation->setPosAt(i/200.0, QPointF(150.0 - i/200.0, rc.top()));
	 }
 
	 for (int i = 0; i < 200; ++i)
	 {
		//animation1->setTranslationAt(i/200.0, -i/200.0,0);
		animation1->setScaleAt(i/200.0, 1 + i/200.0, 1 + i/200.0);		
		//animation1->setTranslationAt(i/200.0, -rc2.width()/2.0, -rc2.height()/2.0);
		animation1->setPosAt(i/200.0, QPointF(150.0 -i/200.0, rc2.top()));
	 }
 
 
	 rc = ball->mapToScene(ball->boundingRect()).boundingRect();
	 rc1 = ecl->mapToScene(ecl->boundingRect()).boundingRect();
	 rc2 = Rect->mapToScene(Rect->boundingRect()).boundingRect();
 
 
	 //scene->addItem(Rect);	 
 
	 //scene->setSceneRect(10, 10, 900, 700);         
 
	return a.exec();
}

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