ArcObjects Library Reference (Geometry)

IConstructPoint.ConstructDeflectionIntersection Method

Constructs the point of intersection of two rays with origins at the endpoints of the base line and the specified angles (in radians). If onRightSide is true, this work will be done to the right of the base line, otherwise to the left.

[Visual Basic .NET]
Public Sub ConstructDeflectionIntersection ( _
    ByVal baseLine As ILine, _
    ByVal startAngle As Double, _
    ByVal endAngle As Double, _
    ByVal OnRightSide As Boolean _
)

[C#]
public void ConstructDeflectionIntersection (
    ILine baseLine,
    double startAngle,
    double endAngle,
    bool OnRightSide
);

[C++]
HRESULT ConstructDeflectionIntersection(
  ILine* baseLine,
  double startAngle,
  double endAngle,
  VARIANT_BOOL OnRightSide
);

[C++]

Parameters

baseLine

baseLine is a parameter of type ILine

startAngle startAngle is a parameter of type double endAngle endAngle is a parameter of type double OnRightSide OnRightSide is a parameter of type VARIANT_BOOL

Product Availability

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

Remarks

the bRightSide flag can be used to always force the constructed point to be on the right side of the baseline.

The startAngle is the angle (in radians) from the baseline's startpoint of the line to the constructed point. The endAngle is the angle (in radians) from the baseline's endpoint to the constructed point.

Both angles have to be > 0 and < 2 PI radians. Their sum must also be less than PI radians.

ConstructDeflectionIntersection Example

[C#]

//Constructs a point from the baseline from (0,0) to (1,1)
//with the deflection angle of 45 degrees (PI/4 radians).
public void ConstructDeflectionIntersection()
{
  IPoint fromPoint = new PointClass();
  fromPoint.PutCoords(0, 0);
  IPoint toPoint = new PointClass();
  toPoint.PutCoords(1, 1);
  ILine line = new LineClass();
  line.PutCoords(fromPoint, toPoint);
  double startAngle = Math.PI / 4;
  double endAngle = Math.PI / 4;
  IConstructPoint constructionPoint = new PointClass();
  constructionPoint.ConstructDeflectionIntersection(line, startAngle, endAngle, false);
  IPoint point = constructionPoint as IPoint;
  System.Windows.Forms.MessageBox.Show("x,y = " + point.X + ", " + point.Y);

[Visual Basic .NET]

    '+++ Constructs a point as the intersection of 2 lines with angles
    '+++ dStartAngle (from the startpoint of the line) and dEndAngle.
    '+++ The flag to force the line to the right side is turned off.

    Public Sub t_ConstructDeflectionIntersection()
        Dim pPointFrom As ESRI.ArcGIS.Geometry.IPoint
        Dim pPointTo As ESRI.ArcGIS.Geometry.IPoint
        Dim pLine As ESRI.ArcGIS.Geometry.ILine
        Dim pPoint As ESRI.ArcGIS.Geometry.IPoint
        Dim pCPoint As ESRI.ArcGIS.Geometry.IConstructPoint
        Dim dStartAngle As Double
        Dim dEndAngle As Double
        Dim pi As Double

        pPointFrom = New ESRI.ArcGIS.Geometry.Point
        pPointTo = New ESRI.ArcGIS.Geometry.Point
        pCPoint = New ESRI.ArcGIS.Geometry.Point
        pPoint = New ESRI.ArcGIS.Geometry.Point
        pLine = New ESRI.ArcGIS.Geometry.Line

        pPointFrom.PutCoords(0, 0)
        pPointTo.PutCoords(1, 0)
        pLine.PutCoords(pPointFrom, pPointTo)

        pi = 4 * Math.Atan(1)
        dStartAngle = pi / 4
        dEndAngle = pi / 4

        pCPoint.ConstructDeflectionIntersection(pLine, dStartAngle, dEndAngle, False)
        pPoint = pCPoint
        MsgBox("x,y = " & pPoint.X & "," & pPoint.Y)

End Sub

IConstructPoint.ConstructDeflectionIntersection Method

Product Availability

Remarks

See Also