EllipticArcBuilderEx Constructor(MapPoint,MapPoint,Coordinate2D,SpatialReference)

In This Topic

Creates a new instance of the EllipticArcBuilderEx class. The new instance will be a circular arc from three points.

Syntax

C#
Visual Basic (Declaration)

public EllipticArcBuilderEx( 
   MapPoint startPt,
   MapPoint endPt,
   Coordinate2D interiorPt,
   SpatialReference spatialReference
)

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

Parameters

startPt: The point from which the arc starts.
endPt: The point to which the arc ends.
interiorPt: An interior point of the arc.
spatialReference: (Optional) The spatial reference. The default value is null. The spatial reference2 of the start and end points are ignored.

Exceptions

Exception	Description
System.ArgumentNullException	startPt or endPt is null or empty.
System.ArgumentException	interiorPt is empty.

Example

Construct a Circular Arc - using an interior point

// Construct a circular arc from (2, 1) to (1, 2) with interior pt (1 + sqrt(2)/2, 1 + sqrt(2)/2).
// Use a builderEx convenience method or use a builderEx constructor.

MapPoint fromPt = MapPointBuilderEx.CreateMapPoint(2, 1);
MapPoint toPt = MapPointBuilderEx.CreateMapPoint(1, 2);
Coordinate2D interiorPt = new Coordinate2D(1 + Math.Sqrt(2) / 2, 1 + Math.Sqrt(2) / 2);

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateCircularArc(fromPt, toPt, interiorPt);

// BuilderEx constructors don't need to run on the MCT.
EllipticArcBuilderEx eab = new EllipticArcBuilderEx(fromPt, toPt, interiorPt);
// do something with the builder

EllipticArcSegment anotherCircularArc = eab.ToSegment();

Create Circle Text Element

//Must be on QueuedTask.Run(() => { ...

//Build geometry
Coordinate2D center = new Coordinate2D(4.5, 4);
var eabCir = new EllipticArcBuilderEx(center, 0.5, ArcOrientation.ArcClockwise);
var cir = eabCir.ToSegment();

var poly = PolygonBuilderEx.CreatePolygon(
  PolylineBuilderEx.CreatePolyline(cir, AttributeFlags.AllAttributes));

//Set symbolology, create and add element to layout
CIMTextSymbol sym = SymbolFactory.Instance.ConstructTextSymbol(
                ColorFactory.Instance.GreenRGB, 10, "Arial", "Regular");
string text = "Circle, circle, circle";

GraphicElement cirTxtElm = ElementFactory.Instance.CreateTextGraphicElement(
  container, TextType.CircleParagraph, poly, sym, text, "New Circle Text", false);

Requirements

Target Platforms: Windows 11, Windows 10

ArcGIS Pro version: 3 or higher.

Reference

EllipticArcBuilderEx Class
EllipticArcBuilderEx Members
Overload List

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