How can we scale the pen's width

I draw a line with the default pen in QGraphicsScene with the function
QGraphicsScene::addLine ( const QLineF & line, const QPen & pen = QPen() );

but when I scale this with the function: QGraphicsView::scale().
The line's length can be scale very well, but the width of the line always keeps the same.
Are there some solutions to do it?

Thanks!

Quote:

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Originally Posted by learning_qt

I draw a line with the default pen in QGraphicsScene with the function
QGraphicsScene::addLine ( const QLineF & line, const QPen & pen = QPen() );

but when I scale this with the function: QGraphicsView::scale().
The line's length can be scale very well, but the width of the line always keeps the same.
Are there some solutions to do it?

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Have you seen http://doc.trolltech.com/4.4/qpen.html#setWidth ?

Especially: Has your pen a width of 0 (i.e. is it a "cosmetic" pen) or 1?