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

In This Topic

Creates a new instance of the EllipticArcBuilderEx class. The new instance will be an ellipse.

Syntax

C#
Visual Basic (Declaration)

public EllipticArcBuilderEx( 
   Coordinate2D centerPt,
   double rotationAngle,
   double semiMajorAxis,
   double minorMajorRatio,
   ArcOrientation orientation,
   SpatialReference spatialReference
)

Public Function New( _
   ByVal centerPt As Coordinate2D, _
   ByVal rotationAngle As Double, _
   ByVal semiMajorAxis As Double, _
   ByVal minorMajorRatio As Double, _
   ByVal orientation As ArcOrientation, _
   Optional ByVal spatialReference As SpatialReference _
)

Parameters

centerPt: The center point of the ellipse.
rotationAngle: The angle in radians by which the ellipse is rotated from the X-axis. A positive value corresponds to counterclockwise rotation.
semiMajorAxis: The length of the semi-major axis.
minorMajorRatio: The ratio of the length of the semi-minor axis to the length of the semi-major axis. The absolute value must be <= 1.
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.ArgumentException	rotationAngle, semiMajorAxis or minorMajorRatio is NaN.
System.ArgumentException	An elliptic arc construction operation was given invalid axes. The absolute value of minorMajorRatio is > 1.
System.ArgumentException	centerPt is empty.

Remarks

If is equal to one, then a circular arc will be created and the rotation angle will be equal to zero.

Example

Construct an Ellipse

// Construct an ellipse centered at (1, 2) with rotationAngle = -pi/6,  
// semiMajorAxis = 5, minorMajorRatio = 0.2, oriented clockwise.
// Use a builderEx convenience method or use a builderEx constructor.

Coordinate2D centerPt = new Coordinate2D(1, 2);

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment ellipse = EllipticArcBuilderEx.CreateEllipse(centerPt, -1 * Math.PI / 6, 5, 0.2, ArcOrientation.ArcClockwise);

// This EllipticArcBuilderEx constructor doesn't need to run on the MCT.
EllipticArcBuilderEx builder = new EllipticArcBuilderEx(centerPt, -1 * Math.PI / 6, 5, 0.2, ArcOrientation.ArcClockwise);
EllipticArcSegment anotherEllipse = builder.ToSegment();

Create Ellipse Text Element

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

//Build geometry
Coordinate2D center = new Coordinate2D(4.5, 2.75);
var eabElp = new EllipticArcBuilderEx(center, 0, 1, 0.45, ArcOrientation.ArcClockwise);
var ellipse = eabElp.ToSegment();

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

//Set symbology, create and add element to layout
CIMTextSymbol sym = SymbolFactory.Instance.ConstructTextSymbol(
                      ColorFactory.Instance.BlueRGB, 10, "Arial", "Regular");
string text = "Ellipse, ellipse, ellipse";

GraphicElement ge = ElementFactory.Instance.CreateTextGraphicElement(
  container, TextType.PolygonParagraph, poly, sym, text, "New Ellipse 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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