EllipticArcBuilderEx Constructor(MapPoint,Double,Double,Double,ArcOrientation,MinorOrMajor,SpatialReference)

In This Topic

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

Syntax

Visual Basic (Declaration)
C#

Public Function New( _
   ByVal startPt As MapPoint, _
   ByVal chordLength As Double, _
   ByVal chordBearing As Double, _
   ByVal radius As Double, _
   ByVal orientation As ArcOrientation, _
   ByVal minorOrMajor As MinorOrMajor, _
   Optional ByVal spatialReference As SpatialReference _
)

public EllipticArcBuilderEx( 
   MapPoint startPt,
   double chordLength,
   double chordBearing,
   double radius,
   ArcOrientation orientation,
   MinorOrMajor minorOrMajor,
   SpatialReference spatialReference
)

Parameters

startPt: The point from which the arc starts.
chordLength: The length of the chord connecting start point to the end point of the arc. If negative, then the absolute value is used. Cannot be equal to zero.
chordBearing: The angle in radians of the chord connecting the start point to the end point of the arc.
radius: The radius of the embedded circle.
orientation: The orientation of the arc, clockwise or counterclockwise.
minorOrMajor: Indicates whether the arc is a minor or major arc. A minor arc is an arc such that the central angle is less than PI radians.
spatialReference: (Optional) The spatial reference of the arc. The default value is null. The spatial reference of the start point is ignored.

Exceptions

Exception	Description
System.ArgumentNullException	startPt is null or empty.
System.ArgumentException	chordLength, chordBearing or radius is NaN.
System.ArgumentException	chordLength equals zero or is greater than 2 * radius.

Example

Construct a Circular Arc - using a chord length and bearing

{
  // Construct a circular arc counterclockwise from (2, 1) to (1, 2) such that the embedded 
  // circle has center point at (1, 1) and radius = 1.
  // Use a builderEx convenience method or use a builderEx constructor.

  MapPoint fromPtArc = MapPointBuilderEx.CreateMapPoint(2, 1, SpatialReferences.WGS84);
  double chordLength = Math.Sqrt(2);
  double chordBearing = 3 * Math.PI / 4;
  double radius = 1;
  ArcOrientation orientation = ArcOrientation.ArcCounterClockwise;
  MinorOrMajor minorOrMajor = MinorOrMajor.Minor;

  // BuildeEx convenience methods don't need to run on the MCT.
  EllipticArcSegment circularArcBuilder = EllipticArcBuilderEx.CreateCircularArc(fromPtArc, chordLength, chordBearing, radius, orientation, minorOrMajor);

  // BuilderEx constructors don't need to run on the MCT either.
  EllipticArcBuilderEx ellipticArcBuilderEx = new EllipticArcBuilderEx(fromPtArc, chordLength, chordBearing, radius, orientation, minorOrMajor);
  // do something with the builder

  EllipticArcSegment anotherCircularArc = ellipticArcBuilderEx.ToSegment();
}

Create Ellipse Text Element

{
  //Note: 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(
    layout, TextType.PolygonParagraph, poly, sym, text, "New Ellipse Text", false);
}

Create Predefined Shape Graphic Element 3

{
  //Note: Must be on QueuedTask.Run

  //Build geometry
  Coordinate2D center = new Coordinate2D(2, 2.75);
  var eabElp = new EllipticArcBuilderEx(
                           center, 0, 1, 0.45, ArcOrientation.ArcClockwise);
  var ellipse = eabElp.ToSegment();

  //Set symbology, create and add element to layout
  CIMStroke outline = SymbolFactory.Instance.ConstructStroke(
                        ColorFactory.Instance.GreenRGB, 2.0, SimpleLineStyle.Dot);
  CIMPolygonSymbol ellipseSym = SymbolFactory.Instance.ConstructPolygonSymbol(
                   ColorFactory.Instance.GreyRGB, SimpleFillStyle.Vertical, outline);

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

  var ge = ElementFactory.Instance.CreatePredefinedShapeGraphicElement(
    layout, PredefinedShape.Ellipse, poly.Extent.Center, 0, 0, ellipseSym,
    "New Ellipse2", false, new ElementInfo() { Anchor = Anchor.TopRightCorner });
}

Requirements

Target Platforms: Windows 11 Home, Pro, Enterprise (64 bit)

ArcGIS Pro version: 3.0 or higher.

Reference

EllipticArcBuilderEx Class
EllipticArcBuilderEx Members
Overload List

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