Scale(Geometry,MapPoint,Double,Double) Method

In This Topic

Scales the geometry about the specified origin.

Syntax

C#
Visual Basic (Declaration)

Geometry Scale( 
   Geometry geometry,
   MapPoint origin,
   double sx,
   double sy
)

Overloads Function Scale( _
   ByVal geometry As Geometry, _
   ByVal origin As MapPoint, _
   ByVal sx As Double, _
   ByVal sy As Double _
) As Geometry

Parameters

geometry: The geometry to scale.
origin: The origin around which the geometry will be scaled.
sx: The scale factor along the X-axis.
sy: The scale factor along the Y-axis.

Return Value

The scaled geometry. If the input geometry is empty, then it is returned unchanged.

Exceptions

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

Remarks

GeometryEngine Scale

Example

Scale a geometry

List<MapPoint> pts = new List<MapPoint>();
pts.Add(MapPointBuilderEx.CreateMapPoint(1.0, 1.0, 3.0));
pts.Add(MapPointBuilderEx.CreateMapPoint(1.0, 3.0, 3.0));
pts.Add(MapPointBuilderEx.CreateMapPoint(3, 3, 3.0));
pts.Add(MapPointBuilderEx.CreateMapPoint(3.0, 1.0, 3.0));

MapPoint midPt = MapPointBuilderEx.CreateMapPoint(1.5, 1.5);

// polyline
Polyline polyline = PolylineBuilderEx.CreatePolyline(pts);
// polyline.Length = 6
// polyline.Length3D = 0
Geometry g = GeometryEngine.Instance.Scale(polyline, midPt, 0.5, 0.5);
Polyline resultPolyline = g as Polyline;
// resultPolyline.length  = 3
// resultPolyline.Points[0] = 1.25, 1.25, 3
// resultPolyline.Points[1] = 1.25, 2.25, 3
// resultPolyline.Points[2] = 2.25, 2.25, 3
// resultPolyline.Points[3] = 2.25, 1.25, 3

// 3D point - scale in 3d
MapPoint midPtZ = MapPointBuilderEx.CreateMapPoint(1.5, 1.5, 1);
g = GeometryEngine.Instance.Scale(polyline, midPtZ, 0.5, 0.5, 0.25);
resultPolyline = g as Polyline;
// resultPolyline.Points[0] = 1.25, 1.25, 1.5
// resultPolyline.Points[1] = 1.25, 2.25, 1.5
// resultPolyline.Points[2] = 2.25, 2.25, 1.5
// resultPolyline.Points[3] = 2.25, 1.25, 1.5

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.

Reference

IGeometryEngine Interface
IGeometryEngine Members
Overload List

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