finding collection of points index on a curve

[Alex22]

Hi,
I need to find index of all points that are into the area of a selected area by a picker. I could find index of an only one point index by this code:

connect( picker, SIGNAL( selected( const QPolygon & ), SLOT(UpdVizir( const QPolygon & )));

connect( picker, SIGNAL( selected( const QPolygon & ), SLOT(UpdVizir( const QPolygon & )));

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void TrendTop::UpdVizir( const QPolygon &points )
    {
        if ( points.size() != 1 )
             return; 
 
        double dist;
        int index = curv1->closestPoint( points[0], &dist );
    }

void TrendTop::UpdVizir( const QPolygon &points )
    {
        if ( points.size() != 1 )
             return; 
     
        double dist;
        int index = curv1->closestPoint( points[0], &dist );
    }

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How all points into a selected area can be obtained?