Quote Originally Posted by stilgar View Post
Hi xilcoy,
First of all i d'dn't understand why the third parameter is const QRectF; shouldn't it be const QwtDoubleRect instead?
A QwtDoubleRect is a QRectF. From the Qwt docs:

Qt Code: 
  1. typedef QPointF 	QwtDoublePoint
  2. typedef QSizeF 	QwtDoubleSize
  3. typedef QRectF 	QwtDoubleRect
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