how to get color at coordinate when i press mouse on canvasview or widget?

[kstking]

this is my code:

void FigureEditor::contentsMousePressEvent(QMouseEvent* e)
{
       QPoint p = inverseWorldMatrix().mp(e->pos());
	QPoint tmpPointEdit = e->pos();
        QCanvasItemList l=canvas()->collisions(p);
	QCanvasItemList::Iterator it = l.begin();
        ImageItem *item;
        for (it; it!=l.end(); ++it) {
            if ( (*it)->rtti() == imageRTTI ) {
                item = (ImageItem*)(*it);
                if ( !item->hit( p ) )
                    continue;
            }
 
            tmpPointEdit = p;  
            moving = *it;
            moving_start = p;
            break;
        }
		int ix = tmpPointEdit.x();
		int iy = tmpPointEdit.y();
		QImage *img = (QImage*)(*it);
 		QRgb newPixel = img -> pixel( ix, iy );
}

void FigureEditor::contentsMousePressEvent(QMouseEvent* e)
{
       QPoint p = inverseWorldMatrix().mp(e->pos());
	QPoint tmpPointEdit = e->pos();
        QCanvasItemList l=canvas()->collisions(p);
	QCanvasItemList::Iterator it = l.begin();
        ImageItem *item;
        for (it; it!=l.end(); ++it) {
            if ( (*it)->rtti() == imageRTTI ) {
                item = (ImageItem*)(*it);
                if ( !item->hit( p ) )
                    continue;
            }

            tmpPointEdit = p;  
            moving = *it;
            moving_start = p;
            break;
        }
		int ix = tmpPointEdit.x();
		int iy = tmpPointEdit.y();
		QImage *img = (QImage*)(*it);
 		QRgb newPixel = img -> pixel( ix, iy );
}

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this code is one part of example: http://doc.trolltech.com/3.3/canvas-example.html
i have edited code in pressmouse method .
RUN:
+ First: i draw Rect with Red color on canvas. and use canvasview to show it.
+Second: i click on Rect. I want to get color at position when i press mouse. And save it into newPixel variable.
--> i wrong?