Qgraphicsview zoom issue

[tarunrajsingh]

Iam using mouse wheel to zoom my view,I have a condition not to zoom out scene below original.
But when i zoom out to original size I dont see original size ,some part is not visible in view port.

When I debugged I found that if I zoom out from a zoomed scene ,just before it reaches scene's original size
my factor becomes 0.9999 so my condition fails and it doesn't zoom out anymore.

Can anybody point our for me if I am doing something wrong here.

void MyView::wheelEvent(QWheelEvent* event)
{
 
   qreal delta=pow((double)2,(event->delta())/ 120.0);
   qreal factor = matrix().scale(delta, delta).mapRect(QRectF(0, 0, 1, 1)).width();
 
    if (factor < 1.000 || factor > 100)
        return;
 
    this->scale(delta,delta);
}

void MyView::wheelEvent(QWheelEvent* event)
{

   qreal delta=pow((double)2,(event->delta())/ 120.0);
   qreal factor = matrix().scale(delta, delta).mapRect(QRectF(0, 0, 1, 1)).width();

    if (factor < 1.000 || factor > 100)
        return;

    this->scale(delta,delta);
}

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