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This document is archived and information here might be outdated. Recommended version. |
ICurve.QueryFromPoint Method (ArcObjects .NET 10.8 SDK)
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This document is archived and information here might be outdated. Recommended version. |
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*
Used to query the FromPoint of the first Segment of the first part of the curve.
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.
//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);
}
}
' 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
ICurve Interface | IPoint Interface | ICurve.QueryFromPoint Method | ICurve.FromPoint Property | ICurve.ToPoint Property | ICurve.QueryToPoint Method