ArcObjects Library Reference (Geometry)

IConstructCircularArc.ConstructTangentChordTangent Method

Constructs an arc with a common tangent to input segment, a given chord length and a tangent length.

[Visual Basic .NET]
Public Sub ConstructTangentChordTangent ( _
    ByVal Segment As ISegment, _
    ByVal atStart As Boolean, _
    ByVal isCCW As Boolean, _
    ByVal chordDistance As Double, _
    ByVal tangentDistance As Double _
)

[C#]
public void ConstructTangentChordTangent (
    ISegment Segment,
    bool atStart,
    bool isCCW,
    double chordDistance,
    double tangentDistance
);

[C++]
HRESULT ConstructTangentChordTangent(
  ISegment* Segment,
  VARIANT_BOOL atStart,
  VARIANT_BOOL isCCW,
  double chordDistance,
  double tangentDistance
);

[C++]

Parameters

Segment

Segment is a parameter of type ISegment

atStart atStart is a parameter of type VARIANT_BOOL isCCW isCCW is a parameter of type VARIANT_BOOL chordDistance chordDistance is a parameter of type double tangentDistance tangentDistance is a parameter of type double

Product Availability

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

Description

Constructs a CircularArc given the Tangent Segment, the desired segment endpoint (the From Point), the desired orientation, the desired Chord Distance, and the desired Tangent Distance. The Tangent Distance must be great than half the Chord Distance, otherwise an error is returned.

Remarks

-isCCW stands for "is counter clockwise"

ConstructCircularArc Tangent Segment Example

ConstructCircularArc Chord and Tangent Distance Example

[C#]

private void ConstructTangentChordTangent()
{
  IConstructCircularArc constructCircularArc = new CircularArcClass();
  ICircularArc circularArc = constructCircularArc as ICircularArc;
  
  IPoint fromPoint = new PointClass();
  fromPoint.PutCoords(100, 100);
  IPoint toPoint = new PointClass();
  toPoint.PutCoords(100, 400);
  ILine line = new LineClass();
  line.PutCoords(fromPoint, toPoint);
  //The angles should be in Radians (Radians = Degrees * PI/180)
  constructCircularArc.ConstructTangentChordTangent(line as ISegment, false, true, 100, 100000000);
   
  String report = "Length : " + circularArc.Length + "\n" +
                  "Radius : " + circularArc.Radius + "\n" +
                  "Chord Height : " + circularArc.ChordHeight + "\n" +
                  "Central Angle (Rad) : " + circularArc.CentralAngle + "\n" +
                  "From Angle (Rad) : " + circularArc.FromAngle + "\n" +
                  "To Angle (Rad) : " + circularArc.ToAngle + "\n" +
                  "Center Point : " + circularArc.CenterPoint.X + " , " + circularArc.CenterPoint.Y + "\n" +
                  "From Point : " + circularArc.FromPoint.X + " , " + circularArc.FromPoint.Y + "\n" +
                  "To Point : " + circularArc.ToPoint.X + " , " + circularArc.ToPoint.Y;
  System.Windows.Forms.MessageBox.Show(report);
}

[Visual Basic .NET]

    Private Sub ConstructTangentChordTangent()
        Dim pConstructCircularArc As ESRI.ArcGIS.Geometry.IConstructCircularArc
        Dim pCArc As ESRI.ArcGIS.Geometry.ICircularArc
        Dim Pi As Double
        Dim pToPoint As ESRI.ArcGIS.Geometry.IPoint
        Dim pFromPoint As ESRI.ArcGIS.Geometry.IPoint
        Dim pPoint As ESRI.ArcGIS.Geometry.IPoint
        Dim pLine1 As ESRI.ArcGIS.Geometry.ILine

        pConstructCircularArc = New ESRI.ArcGIS.Geometry.CircularArc
        pCArc = pConstructCircularArc
        Pi = 4 * Math.Atan(1) 'Calculate the value of pi.
        pFromPoint = New ESRI.ArcGIS.Geometry.Point
        pToPoint = New ESRI.ArcGIS.Geometry.Point
        pLine1 = New ESRI.ArcGIS.Geometry.Line
        pFromPoint.PutCoords(100, 100)
        pToPoint.PutCoords(100, 400)
        pLine1.PutCoords(pFromPoint, pToPoint)
        pPoint = New ESRI.ArcGIS.Geometry.Point
        pPoint.PutCoords(200, 400)
        'The angles should be in Radians (Radians = Degrees * PI/180)
        pConstructCircularArc.ConstructTangentChordTangent(pLine1, False, True, 100, 100000000)

        Debug.Print("Length : " & pCArc.Length)
        Debug.Print("Radius : " & pCArc.Radius)
        Debug.Print("Chord Height : " & pCArc.ChordHeight)
        Debug.Print("Central Angle (Rad) : " & pCArc.CentralAngle)
        Debug.Print("From Angle (Rad) : " & pCArc.FromAngle)
        Debug.Print("To Angle (Rad) : " & pCArc.ToAngle)
        Debug.Print("Center Point : " & pCArc.CenterPoint.X & " , " & pCArc.CenterPoint.Y)
        Debug.Print("From Point : " & pCArc.FromPoint.X & " , " & pCArc.FromPoint.Y)
        Debug.Print("To Point : " & pCArc.ToPoint.X & " , " & pCArc.ToPoint.Y)
    End Sub

IConstructCircularArc.ConstructTangentChordTangent Method

Product Availability

Description

Remarks

See Also