ArcObjects Library Reference (Geometry)  

IConstructCurve.ConstructExtended Method

Constructs an extended version of the 'from' curve that goes to the 'to' curve. The flags are bit-wise combined esriCurveExtension values.

[Visual Basic .NET]
Public Sub ConstructExtended ( _
    ByVal fromCurve As ICurve, _
    ByVal toCurve As ICurve, _
    ByVal extensionFlags As Integer, _
    ByRef extensionsPerformed As Boolean _
)
[C#]
public void ConstructExtended (
    ICurve fromCurve,
    ICurve toCurve,
    int extensionFlags,
    ref bool extensionsPerformed
);
[C++]
HRESULT ConstructExtended(
  ICurve* fromCurve,
  ICurve* toCurve,
  long extensionFlags,
  VARIANT_BOOL* extensionsPerformed
);
[C++]

Parameters

fromCurve 

  fromCurve is a parameter of type ICurve

toCurve 

  toCurve is a parameter of type ICurve

extensionFlags 
  extensionFlags is a parameter of type long
extensionsPerformed [in, out]
  extensionsPerformed is a parameter of type VARIANT_BOOL

Product Availability

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

Remarks

This method will return an empty geometry if you attempt to create a polygon from two linear

geometries as input. This is not a way to create a polygon from two polylines.

If the input curve is a polygon the result will be a copy of the polygon.

The flags are bit-wise combined esriCurveExtension values.

ConstructCurve ConstructExtended Example

[C#] 
private void ConstructExtended()
{
   //Segment 0
   IPoint point0 = new PointClass();
   point0.PutCoords(0, 0);
   IPoint point1 = new PointClass();
   point1.PutCoords(10, 10);
   
   ILine segment0 = new LineClass();
   segment0.PutCoords(point0, point1);
   
   //Segment 1
   IPoint point2 = new PointClass();
   point2.PutCoords(10, 10);
   IPoint point3 = new PointClass();
   point3.PutCoords(10, 0);
      
   ILine segment1 = new LineClass();
   segment1.PutCoords(point2, point3);
   
   //Segment 2
   IPoint point4 = new PointClass();
   point4.PutCoords(10, 0);
   IPoint point5 = new PointClass();
   point5.PutCoords(0, 0);
   ILine segment2 = new LineClass();
   segment2.PutCoords(point4, point5);
   
  //Polygon
   object Missing = Type.Missing;
   ISegmentCollection segmentCollection = new PolygonClass();
   segmentCollection.AddSegment(segment0 as ISegment, ref Missing, ref Missing);
   segmentCollection.AddSegment(segment1 as ISegment, ref Missing, ref Missing);
   segmentCollection.AddSegment(segment2 as ISegment, ref Missing, ref Missing);
   ICurve curve = segmentCollection as ICurve;
   
  //Line
   IPoint point6 = new PointClass();
   point6.PutCoords(-10, 20);
   IPoint point7= new PointClass();
   point7.PutCoords(0, 5);
   ILine line = new Line();
   line.PutCoords(point6, point7);
   
  //Polyline
   ISegmentCollection polyLineSegmentCollection = new PolylineClass();
   polyLineSegmentCollection.AddSegment(line as ISegment, ref Missing, ref Missing);
   ICurve curve1 = polyLineSegmentCollection as ICurve;
   
  //Construct the extend
   IConstructCurve constructCurve = new PolylineClass();
   bool isExtensionPerfomed = false;
   constructCurve.ConstructExtended(curve, curve1, (int) esriCurveExtension.esriDefaultCurveExtension, ref isExtensionPerfomed);
}
[Visual Basic .NET]

    Private Sub ConstructExtended()
        Dim pConstructCurve As ESRI.ArcGIS.Geometry.IConstructCurve
        Dim pCurve1 As ESRI.ArcGIS.Geometry.ICurve
        Dim pCurve2 As ESRI.ArcGIS.Geometry.ICurve
        Dim pPolyLineGeoColl As ESRI.ArcGIS.Geometry.ISegmentCollection
        Dim pPolygonGeoColl As ESRI.ArcGIS.Geometry.ISegmentCollection
        Dim pSeg0 As ESRI.ArcGIS.Geometry.ILine
        Dim pSeg1 As ESRI.ArcGIS.Geometry.ILine
        Dim pSeg2 As ESRI.ArcGIS.Geometry.ILine
        Dim pLine As ESRI.ArcGIS.Geometry.ILine
        Dim pPt0 As ESRI.ArcGIS.Geometry.IPoint
        Dim pPt1 As ESRI.ArcGIS.Geometry.IPoint
        Dim bExtensionPerformed As Boolean
        'Points
        pPt0 = New ESRI.ArcGIS.Geometry.Point
        pPt1 = New ESRI.ArcGIS.Geometry.Point
        'Segment 0
        pSeg0 = New ESRI.ArcGIS.Geometry.Line
        pPt0.PutCoords(0, 0)
        pPt1.PutCoords(10, 10)
        pSeg0.PutCoords(pPt0, pPt1)
        'Segment 1
        pSeg1 = New ESRI.ArcGIS.Geometry.Line
        pPt0.PutCoords(10, 10)
        pPt1.PutCoords(10, 0)
        pSeg1.PutCoords(pPt0, pPt1)
        'Segment 2
        pSeg2 = New ESRI.ArcGIS.Geometry.Line
        pPt0.PutCoords(10, 0)
        pPt1.PutCoords(0, 0)
        pSeg2.PutCoords(pPt0, pPt1)
        'Polygon
        pPolygonGeoColl = New ESRI.ArcGIS.Geometry.Polygon
        pPolygonGeoColl.AddSegment(pSeg0)
        pPolygonGeoColl.AddSegment(pSeg1)
        pPolygonGeoColl.AddSegment(pSeg2)
        pCurve2 = pPolygonGeoColl
        'Line
        pLine = New ESRI.ArcGIS.Geometry.Line
        pPt0.PutCoords(-10, 20)
        pPt1.PutCoords(0, 5)
        pLine.PutCoords(pPt0, pPt1)
        'Polyline
        pPolyLineGeoColl = New ESRI.ArcGIS.Geometry.Polyline
        pPolyLineGeoColl.AddSegment(pLine)
        pCurve1 = pPolyLineGeoColl
        'Construct the extend
        pConstructCurve = New ESRI.ArcGIS.Geometry.Polyline
        pConstructCurve.ConstructExtended(pCurve1, pCurve2, ESRI.ArcGIS.Geometry.esriCurveExtension.esriDefaultCurveExtension, bExtensionPerformed)
    End Sub

See Also

IConstructCurve Interface