I was trying to use the QwtSeriesData (Qwt6.0.2) and found some confusion with boundingRect().
I have a data like below
Qt Code: 
  1. class MyData : public QwtSeriesData<QPointF>
  2. {
  3. public:
  4.     virtual size_t size() const
  5.     {
  6.         return 200;
  7.     }
  8.     virtual QPointF sample( size_t i ) const
  9.     {
  10.         QPointF point(i*10,i%2 ? 300 : 500);
  11.         return point;
  12.     }
  13.     virtual QRectF boundingRect() const
  14.     {
  15.        QRectF r =  qwtBoundingRect(*this); //<--this produce left image
  16.        //QRectF r(0,0,2000,1000); <-- this produced right image
  17.        return r;
  18.     }
  19. };
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Screen Shot 2012-01-11 at 10.37.11 PM.pngScreen Shot 2012-01-11 at 10.37.42 PM.png

It seems like the boundingRect is giving some scale factor to the real data. Is this a bug? by the way I set the QwtPlot to be autoscaling.

baray98