EllipseGeometry - Cesium Documentation

EllipseGeometry

new EllipseGeometry

A description of an ellipse on an ellipsoid.

Parameters:

Name	Type	Argument	Default	Description
`options.center`	Cartesian3			The ellipse's center point in the fixed frame.
`options.semiMajorAxis`	Number			The length of the ellipse's semi-major axis in meters.
`options.semiMinorAxis`	Number			The length of the ellipse's semi-minor axis in meters.
`options.ellipsoid`	Ellipsoid	<optional>	Ellipsoid.WGS84	The ellipsoid the ellipse will be on.
`options.height`	Number	<optional>	0.0	The height above the ellipsoid.
`options.extrudedHeight`	Number	<optional>		The height of the extrusion.
`options.rotation`	Number	<optional>	0.0	The angle from north (clockwise) in radians. The default is zero.
`options.stRotation`	Number	<optional>	0.0	The rotation of the texture coordinates, in radians. A positive rotation is counter-clockwise.
`options.granularity`	Number	<optional>	CesiumMath.RADIANS_PER_DEGREE	The angular distance between points on the ellipse in radians.
`options.vertexFormat`	VertexFormat	<optional>	VertexFormat.DEFAULT	The vertex attributes to be computed.

Throws:

DeveloperError : center is required.
DeveloperError : semiMajorAxis is required.
DeveloperError : semiMinorAxis is required.
DeveloperError : semiMajorAxis and semiMinorAxis must be greater than zero.
DeveloperError : semiMajorAxis must be larger than the semiMajorAxis.
DeveloperError : granularity must be greater than zero.

Example

// Create an ellipse.
var ellipsoid = Ellipsoid.WGS84;
var ellipse = new EllipseGeometry({
  ellipsoid : ellipsoid,
  center : ellipsoid.cartographicToCartesian(Cartographic.fromDegrees(-75.59777, 40.03883)),
  semiMajorAxis : 500000.0,
  semiMinorAxis : 300000.0,
  rotation : CesiumMath.toRadians(60.0)
});
var geometry = EllipseGeometry.createGeometry(ellipse);

See:

EllipseGeometry#createGeometry

Source:

/Source/Core/EllipseGeometry.js

Methods

<static> createGeometry

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

Parameters:

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

Returns:

Geometry The computed vertices and indices.