EllipticArcBuilderEx Constructor(Double,Double,Coordinate2D,Double,SpatialReference)

In This Topic

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

Syntax

C#
Visual Basic (Declaration)

public EllipticArcBuilderEx( 
   double startAngle,
   double centralAngle,
   Coordinate2D centerPt,
   double radius,
   SpatialReference spatialReference
)

Public Function New( _
   ByVal startAngle As Double, _
   ByVal centralAngle As Double, _
   ByVal centerPt As Coordinate2D, _
   ByVal radius As Double, _
   Optional ByVal spatialReference As SpatialReference _
)

Parameters

startAngle: The angle, measured from a horizontal line through the circular arc's center point, that defines where the arc starts.
centralAngle: The angle which describes the span of the circular arc.
centerPt: The center point of the embedded circle.
radius: The distance from the center of the embedded circle to the perimeter.
spatialReference: (Optional) The spatial reference of the arc. The default value is null.

Exceptions

Exception	Description
System.ArgumentException	centerPt is empty.
System.ArgumentException	startAngle or centralAngle is NaN.

Example

Construct a Circular Arc - using a center point, angle and radius

// Construct a circular arc with center point at (0, 0), from angle = 0, 
// central angle = pi/2, radius = 1.
// Use a builderEx convenience method or use a builderEx constructor.

SpatialReference sr4326 = SpatialReferences.WGS84;
Coordinate2D centerPt = new Coordinate2D(0, 0);
double fromAngle = 0;
double centralAngle = Math.PI / 2;
double radius = 1;

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateCircularArc(fromAngle, centralAngle, centerPt, radius, sr4326);

// BuilderEx constructors don't need to run on the MCT.
EllipticArcBuilderEx cab = new EllipticArcBuilderEx(fromAngle, centralAngle, centerPt, radius, sr4326);
EllipticArcSegment otherCircularArc = cab.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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