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:

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.