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ICurve.QueryFromPoint Method (ArcObjects .NET 10.6 SDK)
ArcObjects Library Reference (Geometry)  

ICurve.QueryFromPoint Method

Copies this curve's 'from' point to the input point.

[Visual Basic .NET]
Public Sub QueryFromPoint ( _
    ByVal from As IPoint _
)

[C#]
public void QueryFromPoint (
    IPoint from
);

[C++]
HRESULT QueryFromPoint(
  IPoint* from
);

[C++]

Parameters
from 

  from is a parameter of type IPoint*

Product Availability

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

Description

Used to query the FromPoint of the first Segment of the first part of the curve.

Remarks

Note: The output geometry must be co-created prior to the query. The output geometry is not co-created by the method; it is populated. This can be used in performance critical situations. For example, creating the geometry only once outside a loop and use the query method could improve performance.

QueryFromPoint Example

[C#]

//The example shows how to query the from and to points of a curve.
public void ICurveQueryPoints(IFeature currentFeature)
{
    if (currentFeature.Shape.GeometryType == esriGeometryType.esriGeometryPolyline ||
        currentFeature.Shape.GeometryType == esriGeometryType.esriGeometryLine)
    {
        ICurve curve=currentFeature.Shape as ICurve;
        IPoint fromPoint=new PointClass();
        IPoint toPoint=new PointClass();
        curve.QueryFromPoint(fromPoint);
        curve.QueryToPoint(toPoint);
        System.Windows.Forms.MessageBox.Show("ICurve properties..." + "\n" +
                        "Curve.QueryFromPoint (x,y)=" + fromPoint.X + "," + fromPoint.Y + "\n" +
                        "Curve.QueryToPoint (x,y)=" + toPoint.X + "," + toPoint.Y);
    }
}

[Visual Basic .NET]

    ' The example shows how to query the from and to points of a curve.
    Public Sub t_ICurve_QueryPoints(ByVal pFeature As IFeature)
        Dim pCurve As ICurve
        Dim pPointFrom As IPoint
        Dim pPointTo As IPoint
        pPointFrom=New Point
        pPointTo=New Point

        If pFeature.Shape.GeometryType=esriGeometryType.esriGeometryPolyline Or _
            esriGeometryType.esriGeometryPolyline Or esriGeometryType.esriGeometryLine Then
            pCurve=pFeature.Shape
            pCurve.QueryFromPoint(pPointFrom)
            pCurve.QueryToPoint(pPointTo)
            MsgBox("+++ICurve properties..." & vbCrLf _
              & "Curve.QueryFromPoint (x,y)=" & pPointFrom.X & "," & pPointFrom.Y & vbCrLf _
              & "Curve.QueryToPoint (x,y)=" & pPointTo.X & "," & pPointTo.Y & vbCrLf)
        End If
    End Sub

See Also

ICurve Interface | IPoint Interface | ICurve.QueryFromPoint Method | ICurve.FromPoint Property | ICurve.ToPoint Property | ICurve.QueryToPoint Method

.NET Related Topics

How to work with ICurve methods