# EllipseGeometry

#### new Cesium.EllipseGeometry(options)
Core/EllipseGeometry.js 645

  A description of an ellipse on an ellipsoid. Ellipse geometry can be rendered with both `Primitive` and `GroundPrimitive`.

  Name | Type | Description
  --- | --- | ---
  `options` | Object | Object with the following properties:
  Name | Type | Default | Description
  --- | --- | --- | ---
  `center` | Cartesian3 |  | The ellipse's center point in the fixed frame.
  `semiMajorAxis` | Number |  | The length of the ellipse's semi-major axis in meters.
  `semiMinorAxis` | Number |  | The length of the ellipse's semi-minor axis in meters.
  `ellipsoid` | Ellipsoid | `Ellipsoid.WGS84` | optional The ellipsoid the ellipse will be on.
  `height` | Number | `0.0` | optional The height above the ellipsoid.
  `extrudedHeight` | Number |  | optional The height of the extrusion.
  `rotation` | Number | `0.0` | optional The angle of rotation counter-clockwise from north.
  `stRotation` | Number | `0.0` | optional The rotation of the texture coordinates counter-clockwise from north.
  `granularity` | Number | `CesiumMath.RADIANS_PER_DEGREE` | optional The angular distance between points on the ellipse in radians.
  `vertexFormat` | VertexFormat | `VertexFormat.DEFAULT` | optional The vertex attributes to be computed.

  ##### Throws:

  - DeveloperError : semiMajorAxis and semiMinorAxis must be greater than zero.
  - DeveloperError : semiMajorAxis must be greater than or equal to the semiMinorAxis.
  - DeveloperError : granularity must be greater than zero.

  ##### Example:

      // Create an ellipse.
      var ellipse = new Cesium.EllipseGeometry({
        center : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
        semiMajorAxis : 500000.0,
        semiMinorAxis : 300000.0,
        rotation : Cesium.Math.toRadians(60.0)
      });
      var geometry = Cesium.EllipseGeometry.createGeometry(ellipse);

  ##### See:

  - EllipseGeometry.createGeometry

### Members

#### staticCesium.EllipseGeometry.packedLength : Number
Core/EllipseGeometry.js 697

  The number of elements used to pack the object into an array.

### Methods

#### staticCesium.EllipseGeometry.createGeometry(ellipseGeometry) → Geometry
Core/EllipseGeometry.js 820

  Computes the geometric representation of a ellipse on an ellipsoid, including its vertices, indices, and a bounding sphere.

  Name | Type | Description
  --- | --- | ---
  `ellipseGeometry` | EllipseGeometry | A description of the ellipse.

  ##### Returns:

  The computed vertices and indices.

#### staticCesium.EllipseGeometry.pack(value, array, startingIndex)
Core/EllipseGeometry.js 706

  Stores the provided instance into the provided array.

  Name | Type | Default | Description
  --- | --- | --- | ---
  `value` | EllipseGeometry |  | The value to pack.
  `array` | Array.<Number> |  | The array to pack into.
  `startingIndex` | Number | `0` | optional The index into the array at which to start packing the elements.

#### staticCesium.EllipseGeometry.unpack(array, startingIndex, result) → EllipseGeometry
Core/EllipseGeometry.js 761

  Retrieves an instance from a packed array.

  Name | Type | Default | Description
  --- | --- | --- | ---
  `array` | Array.<Number> |  | The packed array.
  `startingIndex` | Number | `0` | optional The starting index of the element to be unpacked.
  `result` | EllipseGeometry |  | optional The object into which to store the result.

  ##### Returns:

  The modified result parameter or a new EllipseGeometry instance if one was not provided.