QwtPlotPicker questions

[Uwe]

1) I added a QwtPlotPicker, and it seems to work fine. But how can I get the picker selection (i.e. a rectangle or ellipsoid) to stay on the plot?

You have to implement a new type of QwtPlotItem, that displays your rectangle/ellipsoid. In YourPlotItem::draw use QwtPainter::drawRect/drawEllipse instead of QPainter::drawRect/Ellipse if you want to use QwtPlot::print.

2) how can I iterate through the points on my image to highlight those that are inside the picker selection?

QRect QwtPlotItem::transform(const QwtScaleMap &xMap,
    const QwtScaleMap &yMap, const QwtDoubleRect& rect) const

QRect QwtPlotItem::transform(const QwtScaleMap &xMap,
    const QwtScaleMap &yMap, const QwtDoubleRect& rect) const

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Uwe