EllipticArcBuilderEx Constructor(MapPoint,MapPoint,Coordinate2D,ArcOrientation,SpatialReference)

In This Topic

Creates a new instance of the EllipticArcBuilderEx class. The new instance will be a circular arc from end points and the center point.

Syntax

C#
Visual Basic (Declaration)

public EllipticArcBuilderEx( 
   MapPoint startPt,
   MapPoint endPt,
   Coordinate2D centerPt,
   ArcOrientation orientation,
   SpatialReference spatialReference
)

Public Function New( _
   ByVal startPt As MapPoint, _
   ByVal endPt As MapPoint, _
   ByVal centerPt As Coordinate2D, _
   ByVal orientation As ArcOrientation, _
   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. The spatial references of the start and end points are ignored.

Exceptions

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

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 - using a center point and orientation

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

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

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

// BuilderEx constructors need to run on the MCT.
EllipticArcBuilderEx cab = new EllipticArcBuilderEx(fromPt, toPt, centerPtCoord, ArcOrientation.ArcCounterClockwise);
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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