EllipseGeometry

new Cesium.EllipseGeometry(options)
engine/Source/Core/EllipseGeometry.js 920

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 distance in meters between the ellipse and the ellipsoid surface.
extrudedHeight Number optional The distance in meters between the ellipse's extruded face and the ellipsoid surface.
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.
const ellipse = new Cesium.EllipseGeometry({
  center : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
  semiMajorAxis : 500000.0,
  semiMinorAxis : 300000.0,
  rotation : Cesium.Math.toRadians(60.0)
});
const geometry = Cesium.EllipseGeometry.createGeometry(ellipse);
See:

Members

static Cesium.EllipseGeometry.packedLength : Number
engine/Source/Core/EllipseGeometry.js 972

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

Methods

static Cesium.EllipseGeometry.computeRectangle(options, result) → Rectangle
engine/Source/Core/EllipseGeometry.js 1119

Computes the bounding rectangle based on the provided options
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.
rotation Number 0.0 optional The angle of rotation counter-clockwise from north.
granularity Number CesiumMath.RADIANS_PER_DEGREE optional The angular distance between points on the ellipse in radians.
result Rectangle optional An object in which to store the result
Returns:
The result rectangle

static Cesium.EllipseGeometry.createGeometry(ellipseGeometry) → Geometry|undefined
engine/Source/Core/EllipseGeometry.js 1163

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.

static Cesium.EllipseGeometry.pack(value, array, startingIndex) → Array.<Number>
engine/Source/Core/EllipseGeometry.js 987

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.
Returns:
The array that was packed into

static Cesium.EllipseGeometry.unpack(array, startingIndex, result) → EllipseGeometry
engine/Source/Core/EllipseGeometry.js 1043

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.
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