AccelerateForRelationalOperations Method

Produces a copy of the given geometry that is an accelerated geometry used to speed up relational operations. Only polyline and polygon geometries can be accelerated. If the geometry cannot be accelerated, the method returns the same input geometry.

Syntax

C#
Visual Basic (Declaration)

public Geometry AccelerateForRelationalOperations( 
   Geometry geometry
)

Public Function AccelerateForRelationalOperations( _
   ByVal geometry As Geometry _
) As Geometry

Parameters

geometry: A geometry to be accelerated.

Return Value

The accelerated geometry.

Remarks

Note that there is an overhead in setting up an accelerated geometry and that it takes more memory than a normal geometry. You should accelerate a geometry only if you are going to test many other geometries against it. For example you have a polygon and you want to determine if a large number of points intersect the polygon. Accelerate the polygon then loop through the points calling GeometryEngine.Intersects.

If the spatial reference of the geometry is an image coordinate system, then the geometry cannot be accelerated.

The relational operations that are affected by acceleration are Contains, Crosses, Disjoint, Disjoint3D, Equals(Geometry,Geometry), Intersects, Relate, Touches and Within.

Example

// Use acceleration to speed up relational operations.  Accelerate your source geometry only if you are going to test many other geometries against it. 
// Acceleration is applicable for polylines and polygons only. Note that accelerated geometries take more memory so if you aren't going to get any
// benefit from accelerating it, don't do it. 

// The performance of the following GeometryEngine functions are the only ones which can be improved with an accelerated geometry.
//    GeometryEngine.Instance.Contains
//    GeometryEngine.Instance.Crosses
//    GeometryEngine.Instance.Disjoint
//    GeometryEngine.Instance.Disjoint3D
//    GeometryEngine.Instance.Equals
//    GeometryEngine.Instance.Intersects
//    GeometryEngine.Instance.Relate
//    GeometryEngine.Instance.Touches
//    GeometryEngine.Instance.Within


// methods need to run on the MCT
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  // accelerate the geometry to test
  var acceleratedPoly = GeometryEngine.Instance.AccelerateForRelationalOperations(polygon);

  // loop through all the geometries to test against
  foreach (var testPolygon in testPolygons)
  {
    bool contains = GeometryEngine.Instance.Contains(acceleratedPoly, testPolygon);
    bool within = GeometryEngine.Instance.Within(acceleratedPoly, testPolygon);
    bool crosses = GeometryEngine.Instance.Crosses(acceleratedPoly, testPolygon);
  }
});

Requirements

Target Platforms: Windows 10, Windows 8.1, Windows 7

Reference

GeometryEngine Class
GeometryEngine Members