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<p>The <tt>adjust()</tt> function defines and applies a transformation matrix, ensuring that our image item appears with the preferred size regardless of the size of the source image. The <tt>id()</tt> function is trivial, and is simply provided to be able to identify the item. In the <tt>updateItemPosition()</tt> slot we call the <a href="qgraphicsitem.html#setZValue">QGraphicsItem::setZValue</a>() function, setting the elevation (i.e., the position) of the item.</p>
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