QwtPlotCurve draw it's full contents without using current zoom information

[Uwe]

It is probably enough to implement:

virtual void AnalogPlotData::setRectOfInterest( const QRectF &rect )
{
   // rect is the visible area in scale coordinates - the scales the corresponding curve is attached to.
 
   ...
}

virtual void AnalogPlotData::setRectOfInterest( const QRectF &rect )
{
   // rect is the visible area in scale coordinates - the scales the corresponding curve is attached to.

   ...
}

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In Qwt 6.0 it gets called automatically when using Qwt from SVN trunk only when the QwtPlotItem::ScaleInterest flag is set.

HTH,
Uwe

PS: internally QwtSyntheticPointData uses this hook too