ArcGIS Developer Help

IConstructPoint2.ConstructAverage Method

Constructs the geometric average of the input point collection. Optionally uses the specified attribute as a source of weights on the locations of the points.

[Visual Basic .NET]
Public Sub ConstructAverage ( _
    ByVal Points As IPointCollection, _
    ByVal attributeType As esriGeometryAttributes _
)

[C#]
public void ConstructAverage (
    IPointCollection Points,
    esriGeometryAttributes attributeType
);

[C++]
HRESULT ConstructAverage(
  IPointCollection* Points,
  esriGeometryAttributes attributeType
);

[C++]
Parameters
Points 

  Points is a parameter of type IPointCollection*
attributeType 

  attributeType is a parameter of type esriGeometryAttributes

Product Availability

Available with ArcGIS Engine, ArcGIS Desktop, and ArcGIS Server.

Remarks

If attributeType is esriAttributeNone then the average point location is computed; otherwise the attribute specified by attributeType serves as a weight. Points whose weight attribute is NaN are ignored (a weight of 0 has a similar affect). The resulting point will have the (weighted) average for all their attributes. However this does not apply to ID's; no average is calculated for them in any case; but thay can be used as weight.

Only the following attributeType values are permitted: esriAttributeNone, esriAttributeZ, esriAttributeM, esriAttributeID.

[C#]

//This example demonstrates how to use the ConstructAverage method
private void ConstructAverage_Example()
{
    IPointCollection4 pointCollection = new MultipointClass();
    object Missing = Type.Missing;
    //Create a MAware and a ZAware multipoint
    IPoint[] points = new IPoint[4];
    for(int i = 0; i < 4; i++)
    {
        points[i]= new PointClass();
    }
    points[0].PutCoords(0, 0);
    points[0].Z = 10;
    points[0].M = 10;
    points[1].PutCoords(0, 5);
    points[1].Z = 10;
    points[1].M = 10;
    points[2].PutCoords(5, 5);
    points[2].Z = 20;
    points[2].M = 20;
    points[3].PutCoords(5, 0);
    points[3].Z = 10;
    points[3].M = 20;
    IGeometryBridge geomBridge = new GeometryEnvironmentClass();
    geomBridge.AddPoints(pointCollection, ref points);
    IZAware zAwareCollection = pointCollection as IZAware;
    zAwareCollection.ZAware = true;
    IMAware mAwareCollection = pointCollection as IMAware;
    mAwareCollection.MAware = true;
    IConstructPoint2 constructionPoint = new PointClass();
    //Construct the average point with esriAttributeM
    constructionPoint.ConstructAverage(pointCollection, esriGeometryAttributes.esriAttributeM);
    IPoint outPutPoint1 = constructionPoint as IPoint;
    System.Windows.Forms.MessageBox.Show("Output point with esriAttributeM: " + outPutPoint1.X + " , " + outPutPoint1.Y + " , " + outPutPoint1.M);
    //Construct the average point with esriAttributeZ
    constructionPoint.ConstructAverage(pointCollection, esriGeometryAttributes.esriAttributeZ);
    IPoint outPutPoint2 = constructionPoint as IPoint;
    System.Windows.Forms.MessageBox.Show("Output point with esriAttributeZ: " + outPutPoint2.X + " , " + outPutPoint2.Y + " , " + outPutPoint2.Z);
}

[Visual Basic .NET]

    'This example demonstrates how to use the ConstructAverage method
    Sub ConstructAverage_Example()
        Dim pPoints(0 To 3) As IPoint, pPointcol As IPointCollection4
        Dim pZawareCol As IZAware, pMawareCol As IMAware
        Dim pPoint As IPoint, pconstpoint2 As IConstructPoint2
        'Create a MAware and a ZAware multipoint
        pPoints(0) = New Point
        pPoints(1) = New Point
        pPoints(2) = New Point
        pPoints(3) = New Point
        pPoints(0).PutCoords(0, 0)
        pPoints(1).PutCoords(0, 5)
        pPoints(2).PutCoords(5, 5)
        pPoints(3).PutCoords(5, 0)
        pPoints(0).Z = 10
        pPoints(1).Z = 10
        pPoints(2).Z = 20
        pPoints(3).Z = 10
        pPoints(0).M = 10
        pPoints(1).M = 10
        pPoints(2).M = 20
        pPoints(3).M = 10
        pPointcol = New Multipoint
        Dim pGeometryBridge As IGeometryBridge
        pGeometryBridge = New GeometryEnvironment
        pGeometryBridge.AddPoints(pPointcol, pPoints)
        pZawareCol = pPointcol
        pZawareCol.ZAware = True
        pMawareCol = pPointcol
        pMawareCol.MAware = True
        pconstpoint2 = New Point
        '** Construct the average point with esriAttributeM
        pconstpoint2.ConstructAverage(pPointcol, esriGeometryAttributes.esriAttributeM)
        pPoint = pconstpoint2
        Debug.Print("***** esriAttributeM *****")
        Debug.Print(pPoint.X & " , " & pPoint.Y & " , " & pPoint.M)
        '** Construct the average point with esriAttributeZ
        pconstpoint2 = New Point
        pconstpoint2.ConstructAverage(pPointcol, esriGeometryAttributes.esriAttributeZ)
        pPoint = pconstpoint2
        Debug.Print("***** esriAttributeZ *****")
        Debug.Print(pPoint.X & " , " & pPoint.Y & " , " & pPoint.Z)
    End Sub

IConstructPoint2.ConstructAverage Method

Product Availability

Remarks

See Also