ReflectAboutLine Method (IGeometryEngine)

In This Topic

Reflects the input geometry about the given line.

Syntax

C#
Visual Basic (Declaration)

Geometry ReflectAboutLine( 
   Geometry geometry,
   LineSegment reflectionLine
)

Function ReflectAboutLine( _
   ByVal geometry As Geometry, _
   ByVal reflectionLine As LineSegment _
) As Geometry

Parameters

geometry: The input geometry.
reflectionLine: The reflection line.

Return Value

The reflected geometry.

Exceptions

Exception	Description
System.ArgumentNullException	The input geometry or the reflection line is null.
System.ArgumentException	The geometry is an envelope, and envelopes cannot be reflected.
System.InvalidOperationException	Incompatible spatial references.

Remarks

GeometryEngine ReflectAboutLine

Example

Reflect a polygon about a line

SpatialReference sr = SpatialReferences.WGS84;

Coordinate2D start = new Coordinate2D(0, 0);
Coordinate2D end = new Coordinate2D(4, 4);
LineSegment line = LineBuilderEx.CreateLineSegment(start, end, sr);

Coordinate2D[] coords = new Coordinate2D[]
{
  new Coordinate2D(-1, 2),
  new Coordinate2D(-1, 4),
  new Coordinate2D(1, 4),
  new Coordinate2D(-1, 2)
};

Polygon polygon = PolygonBuilderEx.CreatePolygon(coords, sr);

// reflect a polygon about the line
Polygon reflectedPolygon = GeometryEngine.Instance.ReflectAboutLine(polygon, line) as Polygon;

// reflectedPolygon points are 
//    (2, -1), (4, -1), (4, 1), (2, -1)

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.

Reference

IGeometryEngine Interface
IGeometryEngine Members

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