ArcObjects Library Reference (Geometry)

IConstructCircularArc.ConstructBearingAngleTangent Method

Constructs an arc with the given chord bearing, central angle and tangent distance.

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

[C#]
public void ConstructBearingAngleTangent (
    IPoint from,
    double inAngle,
    bool isCCW,
    double CentralAngle,
    double tangentDistance
);

[C++]
HRESULT ConstructBearingAngleTangent(
  IPoint* from,
  double inAngle,
  VARIANT_BOOL isCCW,
  double CentralAngle,
  double tangentDistance
);

[C++]

Parameters
from 

  from is a parameter of type IPoint
inAngle 
  inAngle is a parameter of type double
isCCW 
  isCCW is a parameter of type VARIANT_BOOL
CentralAngle 
  CentralAngle 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 From Point, the Bearing Angle, the desired orientation, the desired Central Angle, and the desired Tangent Distance. The Bearing Angle and Central Angle are measured in radians. The Central Angle should be less than 2 * Pi to ensure proper results. If the Central Angle is greater than Pi, the Tangent Distance is measured opposite the direction of the tangents.

Remarks

-isCCW stands for "is counter clockwise"

ConstructCircularArc Bearing Angle Example

[C#]

private void ConstructBearingAngleTangent()
{
  IConstructCircularArc constructCircularArc=new CircularArcClass();
  ICircularArc circularArc=constructCircularArc as ICircularArc;
  
  IPoint fromPoint=new PointClass();
  fromPoint.PutCoords(100, 100);
 
  //The angles should be in Radians (Radians=Degrees * PI/180)
  constructCircularArc.ConstructBearingAngleTangent(fromPoint, 0, true, (90 * (Math.PI / 180)), 300);
   
  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 ConstructBearingAngleTangent()
Dim pConstructCircularArc As ESRI.ArcGIS.Geometry.IConstructCircularArc
Dim pCArc As ESRI.ArcGIS.Geometry.ICircularArc
Dim Pi As Double
Dim pFromPoint As ESRI.ArcGIS.Geometry.IPoint

pConstructCircularArc=New ESRI.ArcGIS.Geometry.CircularArc
pCArc=pConstructCircularArc
Pi=4 * Math.Atan(1) 'Calculate the value of pi.
pFromPoint=New ESRI.ArcGIS.Geometry.Point
pFromPoint.PutCoords(100, 100)
'The angles should be in Radians (Radians=Degrees * PI/180)
pConstructCircularArc.ConstructBearingAngleTangent(pFromPoint, 0, True, (90 * Pi) / 180, 300)

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.ConstructBearingAngleTangent Method

Product Availability

Description

Remarks

See Also