EllipticArcBuilder Constructor(MapPoint,MapPoint,Coordinate2D,esriArcOrientation,SpatialReference)

Builds a new instance of the EllipticArcBuilder class. The new instance will be a circular arc from end points and the center point. This method must be called on the MCT. Use QueuedTask.Run.

Syntax

C#
Visual Basic (Declaration)

public EllipticArcBuilder( 
   MapPoint startPt,
   MapPoint endPt,
   Coordinate2D centerPt,
   esriArcOrientation orientation,
   SpatialReference spatialReference
)

Public Function New( _
   ByVal startPt As MapPoint, _
   ByVal endPt As MapPoint, _
   ByVal centerPt As Coordinate2D, _
   ByVal orientation As esriArcOrientation, _
   Optional ByVal spatialReference As SpatialReference _
)

Parameters

startPt: The point from which the arc starts.
endPt: The point to which the arc ends.
centerPt: The center point of the embedded circle.
orientation: The orientation of the arc, clockwise or counterclockwise.
spatialReference: (Optional) The spatial reference of the arc. The default value is null.

Exceptions

Exception	Description
System.InvalidOperationException	Incompatible spatial references.
ArcGIS.Core.CalledOnWrongThreadException	This method or property must be called within the lambda passed to QueuedTask.Run.
System.ArgumentNullException	startPt or endPt is null.

Remarks

The xy-tolerance from the spatial reference is used to create the elliptic arc. If the spatial reference is null, then a default tolerance is used which may cause unexpected results.

Example

// Construct a circular arc from (2, 1) to (1, 2) 
// with center point at (1, 1) and orientation counterclockwise.
// Use a builder convenience method or use a builder constructor.

MapPoint toPt = MapPointBuilder.CreateMapPoint(1, 2);
MapPoint fromPt = MapPointBuilder.CreateMapPoint(2, 1);
Coordinate2D centerPtCoord = new Coordinate2D(1, 1);

// Builder convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilder.CreateEllipticArcSegment(fromPt, toPt, centerPtCoord, esriArcOrientation.esriArcCounterClockwise);

// Builder constructors need to run on the MCT.
ArcGIS.Desktop.Framework.Threading.Tasks.QueuedTask.Run(() =>
{
  using (EllipticArcBuilder cab = new EllipticArcBuilder(fromPt, toPt, centerPtCoord, esriArcOrientation.esriArcCounterClockwise))
  {
    // do something with the builder

    EllipticArcSegment otherCircularArc = cab.ToSegment();
  }
});

Requirements

Target Platforms: Windows 10, Windows 8.1

Reference

EllipticArcBuilder Class
EllipticArcBuilder Members
Overload List