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

In This Topic

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

Syntax

C#
Visual Basic (Declaration)

public EllipticArcBuilderEx( 
   Coordinate2D centerPt,
   double startAngle,
   double centralAngle,
   double rotationAngle,
   double semiMajorAxis,
   double minorMajorRatio,
   SpatialReference spatialReference
)

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

Parameters

centerPt: The center point of the elliptic arc.
startAngle: The start angle in radians measured from the rotated X-axis.
centralAngle: The central angle in radians measuring the span of the arc from startAngle to endAngle. A positive value corresponds to counterclockwise orientation.
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.
spatialReference: (Optional) The spatial reference of the arc. The default value is null.

Exceptions

Exception	Description
System.ArgumentException	startAngle, centralAngle, 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 Elliptic Arc - using a center point and rotation angle

// Construct an elliptic arc centered at (1,1), startAngle = 0, centralAngle = PI/2, 
// rotationAngle = 0, semiMajorAxis = 1, minorMajorRatio = 0.5.
// Use a builderEx convenience method or use a builderEx constructor.

Coordinate2D centerPt = new Coordinate2D(1, 1);

// BuilderEx convenience methods don't need to run on the MCT.
EllipticArcSegment circularArc = EllipticArcBuilderEx.CreateEllipticArcSegment(centerPt, 0, Math.PI / 2, 0, 1, 0.5);

double semiMajor;
double semiMinor;
circularArc.GetAxes(out semiMajor, out semiMinor);
// semiMajor = 1, semiMinor = 0.5

// BuilderEx constructors don't need to run on the MCT.
EllipticArcBuilderEx cab = new EllipticArcBuilderEx(centerPt, 0, Math.PI / 2, 0, 1, 0.5);
cab.GetAxes(out semiMajor, out semiMinor);
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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