item local coordinate

[dreamer]

here my specific code for the vertical resize:

void bottom_resize(){
QRectF r=rect();
r.setBottom(event->pos().y());
setRect(r);
scene()->update();
}

void bottom_resize(){
QRectF r=rect();
r.setBottom(event->pos().y());
setRect(r);
scene()->update();
}

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How can I mantein the local coordinate (0,0) on the centre of my resized item???