ICurve.QueryTangent Method

Constructs a line tangent to a curve from a point at a specified distance along the curve.

[Visual Basic .NET]
Public Sub QueryTangent ( _
    ByVal extension As esriSegmentExtension, _
    ByVal DistanceAlongCurve As Double, _
    ByVal asRatio As Boolean, _
    ByVal Length As Double, _
    ByVal tangent As ILine _
)

[C#]
public void QueryTangent (
    esriSegmentExtension extension,
    double DistanceAlongCurve,
    bool asRatio,
    double Length,
    ILine tangent
);

[C++]
HRESULT QueryTangent(
  esriSegmentExtension extension,
  double DistanceAlongCurve,
  VARIANT_BOOL asRatio,
  double Length,
  ILine* tangent
);

[C++]
Parameters
extension 

  extension is a parameter of type esriSegmentExtension
DistanceAlongCurve 

  DistanceAlongCurve is a parameter of type double
asRatio 

  asRatio is a parameter of type bool
Length 

  Length is a parameter of type double
tangent 

  tangent is a parameter of type ILine*

Product Availability

Description

Given a distance along the curve specified either as a ratio of the length or as a specific fixed distance, QueryTangent returns the Line tangent to the Point.  The length and method of tangential extension of the tangent line are given by the user.  The method of tangential extension determines the direction of the tangent line as though it were being extended at a From point or a To point.

Remarks

See Also

ICurve Interface | ILine Interface