Rotate Method (IGeometryEngine)

In This Topic

Rotates the geometry about the specified origin point.

Syntax

C#
Visual Basic (Declaration)

Geometry Rotate( 
   Geometry geometry,
   MapPoint origin,
   double rotationAngle
)

Function Rotate( _
   ByVal geometry As Geometry, _
   ByVal origin As MapPoint, _
   ByVal rotationAngle As Double _
) As Geometry

Parameters

geometry: The geometry to rotate.
origin: The origin around which the geometry will be rotated.
rotationAngle: The rotation angle in radians.

Return Value

The rotated geometry.

Exceptions

Exception	Description
System.ArgumentNullException	Either geometry or origin or both are null or empty.
System.NotImplementedException	The method is not implemented for GeometryBag.
System.InvalidOperationException	Incompatible spatial references between the input geometries.

Example

Rotate a MapPoint

MapPoint pt = MapPointBuilderEx.CreateMapPoint(1.0, 3.0);
MapPoint rotatePt = MapPointBuilderEx.CreateMapPoint(3.0, 3.0);

Geometry result = GeometryEngine.Instance.Rotate(pt, rotatePt, Math.PI / 2);
// result point is (3, 1)

Rotate a Polyline

// rotate a polyline

MapPoint fixedPt = MapPointBuilderEx.CreateMapPoint(3.0, 3.0);

List<MapPoint> pts = new List<MapPoint>();
pts.Add(MapPointBuilderEx.CreateMapPoint(1.0, 1.0));
pts.Add(MapPointBuilderEx.CreateMapPoint(1.0, 5.0));
pts.Add(MapPointBuilderEx.CreateMapPoint(5, 5));
pts.Add(MapPointBuilderEx.CreateMapPoint(5.0, 1.0));
Polyline polyline = PolylineBuilderEx.CreatePolyline(pts);

Polyline rotated = GeometryEngine.Instance.Rotate(polyline, fixedPt, Math.PI / 4) as Polyline;  // rotate 45 deg

Requirements

Target Platforms: Windows 11, Windows 10, Windows 8.1

Reference

IGeometryEngine Interface
IGeometryEngine Members

Send feedback