/
SphereGeometry.js
122 lines (111 loc) · 4.59 KB
/
SphereGeometry.js
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define([
'./Cartesian3',
'./Check',
'./defaultValue',
'./defined',
'./EllipsoidGeometry',
'./VertexFormat'
], function(
Cartesian3,
Check,
defaultValue,
defined,
EllipsoidGeometry,
VertexFormat) {
'use strict';
/**
* A description of a sphere centered at the origin.
*
* @alias SphereGeometry
* @constructor
*
* @param {Object} [options] Object with the following properties:
* @param {Number} [options.radius=1.0] The radius of the sphere.
* @param {Number} [options.stackPartitions=64] The number of times to partition the ellipsoid into stacks.
* @param {Number} [options.slicePartitions=64] The number of times to partition the ellipsoid into radial slices.
* @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
*
* @exception {DeveloperError} options.slicePartitions cannot be less than three.
* @exception {DeveloperError} options.stackPartitions cannot be less than three.
*
* @see SphereGeometry#createGeometry
*
* @example
* var sphere = new Cesium.SphereGeometry({
* radius : 100.0,
* vertexFormat : Cesium.VertexFormat.POSITION_ONLY
* });
* var geometry = Cesium.SphereGeometry.createGeometry(sphere);
*/
function SphereGeometry(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,
vertexFormat: options.vertexFormat
};
this._ellipsoidGeometry = new EllipsoidGeometry(ellipsoidOptions);
this._workerName = 'createSphereGeometry';
}
/**
* The number of elements used to pack the object into an array.
* @type {Number}
*/
SphereGeometry.packedLength = EllipsoidGeometry.packedLength;
/**
* Stores the provided instance into the provided array.
*
* @param {SphereGeometry} 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
*/
SphereGeometry.pack = function(value, array, startingIndex) {
//>>includeStart('debug', pragmas.debug);
Check.typeOf.object('value', value);
//>>includeEnd('debug');
return EllipsoidGeometry.pack(value._ellipsoidGeometry, array, startingIndex);
};
var scratchEllipsoidGeometry = new EllipsoidGeometry();
var scratchOptions = {
radius : undefined,
radii : new Cartesian3(),
vertexFormat : new VertexFormat(),
stackPartitions : undefined,
slicePartitions : 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 {SphereGeometry} [result] The object into which to store the result.
* @returns {SphereGeometry} The modified result parameter or a new SphereGeometry instance if one was not provided.
*/
SphereGeometry.unpack = function(array, startingIndex, result) {
var ellipsoidGeometry = EllipsoidGeometry.unpack(array, startingIndex, scratchEllipsoidGeometry);
scratchOptions.vertexFormat = VertexFormat.clone(ellipsoidGeometry._vertexFormat, scratchOptions.vertexFormat);
scratchOptions.stackPartitions = ellipsoidGeometry._stackPartitions;
scratchOptions.slicePartitions = ellipsoidGeometry._slicePartitions;
if (!defined(result)) {
scratchOptions.radius = ellipsoidGeometry._radii.x;
return new SphereGeometry(scratchOptions);
}
Cartesian3.clone(ellipsoidGeometry._radii, scratchOptions.radii);
result._ellipsoidGeometry = new EllipsoidGeometry(scratchOptions);
return result;
};
/**
* Computes the geometric representation of a sphere, including its vertices, indices, and a bounding sphere.
*
* @param {SphereGeometry} sphereGeometry A description of the sphere.
* @returns {Geometry} The computed vertices and indices.
*/
SphereGeometry.createGeometry = function(sphereGeometry) {
return EllipsoidGeometry.createGeometry(sphereGeometry._ellipsoidGeometry);
};
return SphereGeometry;
});