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SphereOutlineGeometry.js
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SphereOutlineGeometry.js
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import Cartesian3 from "./Cartesian3.js";
import Check from "./Check.js";
import defaultValue from "./defaultValue.js";
import defined from "./defined.js";
import EllipsoidOutlineGeometry from "./EllipsoidOutlineGeometry.js";
/**
* A description of the outline of a sphere.
*
* @alias SphereOutlineGeometry
* @constructor
*
* @param {Object} [options] Object with the following properties:
* @param {Number} [options.radius=1.0] The radius of the sphere.
* @param {Number} [options.stackPartitions=10] The count of stacks for the sphere (1 greater than the number of parallel lines).
* @param {Number} [options.slicePartitions=8] The count of slices for the sphere (Equal to the number of radial lines).
* @param {Number} [options.subdivisions=200] The number of points per line, determining the granularity of the curvature .
*
* @exception {DeveloperError} options.stackPartitions must be greater than or equal to one.
* @exception {DeveloperError} options.slicePartitions must be greater than or equal to zero.
* @exception {DeveloperError} options.subdivisions must be greater than or equal to zero.
*
* @example
* var sphere = new Cesium.SphereOutlineGeometry({
* radius : 100.0,
* stackPartitions : 6,
* slicePartitions: 5
* });
* var geometry = Cesium.SphereOutlineGeometry.createGeometry(sphere);
*/
function SphereOutlineGeometry(options) {
var radius = defaultValue(options.radius, 1.0);
var radii = new Cartesian3(radius, radius, radius);
var ellipsoidOptions = {
radii: radii,
stackPartitions: options.stackPartitions,
slicePartitions: options.slicePartitions,
subdivisions: options.subdivisions,
};
this._ellipsoidGeometry = new EllipsoidOutlineGeometry(ellipsoidOptions);
this._workerName = "createSphereOutlineGeometry";
}
/**
* The number of elements used to pack the object into an array.
* @type {Number}
*/
SphereOutlineGeometry.packedLength = EllipsoidOutlineGeometry.packedLength;
/**
* Stores the provided instance into the provided array.
*
* @param {SphereOutlineGeometry} value The value to pack.
* @param {Number[]} array The array to pack into.
* @param {Number} [startingIndex=0] The index into the array at which to start packing the elements.
*
* @returns {Number[]} The array that was packed into
*/
SphereOutlineGeometry.pack = function (value, array, startingIndex) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object("value", value);
//>>includeEnd('debug');
return EllipsoidOutlineGeometry.pack(
value._ellipsoidGeometry,
array,
startingIndex
);
};
var scratchEllipsoidGeometry = new EllipsoidOutlineGeometry();
var scratchOptions = {
radius: undefined,
radii: new Cartesian3(),
stackPartitions: undefined,
slicePartitions: undefined,
subdivisions: undefined,
};
/**
* Retrieves an instance from a packed array.
*
* @param {Number[]} array The packed array.
* @param {Number} [startingIndex=0] The starting index of the element to be unpacked.
* @param {SphereOutlineGeometry} [result] The object into which to store the result.
* @returns {SphereOutlineGeometry} The modified result parameter or a new SphereOutlineGeometry instance if one was not provided.
*/
SphereOutlineGeometry.unpack = function (array, startingIndex, result) {
var ellipsoidGeometry = EllipsoidOutlineGeometry.unpack(
array,
startingIndex,
scratchEllipsoidGeometry
);
scratchOptions.stackPartitions = ellipsoidGeometry._stackPartitions;
scratchOptions.slicePartitions = ellipsoidGeometry._slicePartitions;
scratchOptions.subdivisions = ellipsoidGeometry._subdivisions;
if (!defined(result)) {
scratchOptions.radius = ellipsoidGeometry._radii.x;
return new SphereOutlineGeometry(scratchOptions);
}
Cartesian3.clone(ellipsoidGeometry._radii, scratchOptions.radii);
result._ellipsoidGeometry = new EllipsoidOutlineGeometry(scratchOptions);
return result;
};
/**
* Computes the geometric representation of an outline of a sphere, including its vertices, indices, and a bounding sphere.
*
* @param {SphereOutlineGeometry} sphereGeometry A description of the sphere outline.
* @returns {Geometry|undefined} The computed vertices and indices.
*/
SphereOutlineGeometry.createGeometry = function (sphereGeometry) {
return EllipsoidOutlineGeometry.createGeometry(
sphereGeometry._ellipsoidGeometry
);
};
export default SphereOutlineGeometry;