finding collection of points index on a curve

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:

Code:

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

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Code:

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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?

If you don't have an extra spatial index for our points you have to iterate over the points and use QRectF::contains().
In case your points are ordered in x or y direction you could use qwtUpperSampleIndex() to speed up the operation.

Uwe

Quote:

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Originally Posted by Uwe

If you don't have an extra spatial index for our points you have to iterate over the points and use QRectF::contains().
In case your points are ordered in x or y direction you could use qwtUpperSampleIndex() to speed up the operation.

Uwe

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Thanks for answering, but I dont want to input any X or Y. I want Only to select an area and then the output be index of points into the area. please help me in this way

Quote:

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Originally Posted by Alex22

I want Only to select an area and then the output be index of points into the area. please help me in this way

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How is your clarification contrary to the given answer ?

Uwe

Uwe,
I can find nothing about "qwtUpperSampleIndex() " in the Doc. I am using multiaxes version.
My purpose is removing some points (that are noise in my signal), by selecting an area that includes these noise points. And after selecting the area by a picker, i need to replot() and after reploting, these points (noise points) be removed.

Quote:

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I can find nothing about "qwtUpperSampleIndex() " in the Doc. I am using multiaxes version.

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It can be found in qwt_series_data.h.

Quote:

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My purpose is removing some points (that are noise in my signal), by selecting an area that includes these noise points.

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Still don't get what additional answer you are waiting for. By iterating ( or using an spatial index ) you can identify all points inside the selected area and build a new buffer without them.
If you don't want to create a second buffer and simply want to exclude points from being plotted you can implement your own type of QwtSeriesData bridge.

Uwe