update method in qgraphicsscne and qgraphicsitem

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hi can any one explain for me that what does exactly updat() work in qgraphicsscene and qgraphicsitem ? and if we don't use it what is the problem?
can you give me an example
i read qt's help. but it's not clear for me.
thanks in advance

Posted 8-Jul-14 5:12am

sara74

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