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 VARIANT_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