ArcObjects Library Reference (Geometry)

IConstructCircularArc.ConstructTangentDistance Method

[Visual Basic .NET]
Public Sub ConstructTangentDistance ( _
    ByVal Center As IPoint, _
    ByVal from As IPoint, _
    ByVal isCCW As Boolean, _
    ByVal tangentDistance As Double _
)

[C#]
public void ConstructTangentDistance (
    IPoint Center,
    IPoint from,
    bool isCCW,
    double tangentDistance
);

[C++]
HRESULT ConstructTangentDistance(
  IPoint* Center,
  IPoint* from,
  VARIANT_BOOL isCCW,
  double tangentDistance
);

[C++]
Parameters
Center 
  Center is a parameter of type IPoint
from 
  from is a parameter of type IPoint
isCCW 
  isCCW is a parameter of type VARIANT_BOOL
tangentDistance 
  tangentDistance is a parameter of type double

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

[C#]

private void ConstructTangentDistance()
{
  IConstructCircularArc constructCircularArc = new CircularArcClass();
  ICircularArc circularArc = constructCircularArc as ICircularArc;
  IPoint fromPoint = new PointClass();
  IPoint toPoint = new PointClass();
  fromPoint.PutCoords(100, 100);
  toPoint.PutCoords(50, 50);
  constructCircularArc.ConstructTangentDistance(fromPoint, toPoint, true, 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 ConstructTangentDistance()
        Dim pConstructCircularArc As ESRI.ArcGIS.Geometry.IConstructCircularArc
        Dim pCArc As ESRI.ArcGIS.Geometry.ICircularArc
        Dim Pi As Double
        Dim pCenterPoint As ESRI.ArcGIS.Geometry.IPoint
        Dim pStartPoint As ESRI.ArcGIS.Geometry.IPoint

        pConstructCircularArc = New ESRI.ArcGIS.Geometry.CircularArc
        pCArc = pConstructCircularArc
        Pi = 4 * Math.Atan(1) 'Calculate the value of pi.
        pCenterPoint = New ESRI.ArcGIS.Geometry.Point
        pStartPoint = New ESRI.ArcGIS.Geometry.Point
        pCenterPoint.PutCoords(200, 100)
        pStartPoint.PutCoords(100, 100)
        'The angles should be in Radians (Radians = Degrees * PI/180)
        pConstructCircularArc.ConstructTangentDistance(pCenterPoint, pStartPoint, True, 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