330 lines
12 KiB
JavaScript
330 lines
12 KiB
JavaScript
define([
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'./arrayFill',
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'./BoundingSphere',
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'./Cartesian3',
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'./ComponentDatatype',
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'./defaultValue',
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'./defined',
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'./DeveloperError',
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'./Ellipsoid',
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'./Geometry',
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'./GeometryAttribute',
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'./GeometryAttributes',
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'./GeometryOffsetAttribute',
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'./IndexDatatype',
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'./Math',
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'./PrimitiveType'
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], function(
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arrayFill,
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BoundingSphere,
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Cartesian3,
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ComponentDatatype,
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defaultValue,
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defined,
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DeveloperError,
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Ellipsoid,
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Geometry,
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GeometryAttribute,
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GeometryAttributes,
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GeometryOffsetAttribute,
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IndexDatatype,
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CesiumMath,
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PrimitiveType) {
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'use strict';
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var defaultRadii = new Cartesian3(1.0, 1.0, 1.0);
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var cos = Math.cos;
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var sin = Math.sin;
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/**
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* A description of the outline of an ellipsoid centered at the origin.
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*
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* @alias EllipsoidOutlineGeometry
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* @constructor
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*
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* @param {Object} [options] Object with the following properties:
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* @param {Cartesian3} [options.radii=Cartesian3(1.0, 1.0, 1.0)] The radii of the ellipsoid in the x, y, and z directions.
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* @param {Number} [options.stackPartitions=10] The count of stacks for the ellipsoid (1 greater than the number of parallel lines).
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* @param {Number} [options.slicePartitions=8] The count of slices for the ellipsoid (Equal to the number of radial lines).
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* @param {Number} [options.subdivisions=128] The number of points per line, determining the granularity of the curvature.
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*
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* @exception {DeveloperError} options.stackPartitions must be greater than or equal to one.
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* @exception {DeveloperError} options.slicePartitions must be greater than or equal to zero.
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* @exception {DeveloperError} options.subdivisions must be greater than or equal to zero.
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*
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* @example
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* var ellipsoid = new Cesium.EllipsoidOutlineGeometry({
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* radii : new Cesium.Cartesian3(1000000.0, 500000.0, 500000.0),
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* stackPartitions: 6,
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* slicePartitions: 5
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* });
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* var geometry = Cesium.EllipsoidOutlineGeometry.createGeometry(ellipsoid);
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*/
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function EllipsoidOutlineGeometry(options) {
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options = defaultValue(options, defaultValue.EMPTY_OBJECT);
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var radii = defaultValue(options.radii, defaultRadii);
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var stackPartitions = Math.round(defaultValue(options.stackPartitions, 10));
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var slicePartitions = Math.round(defaultValue(options.slicePartitions, 8));
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var subdivisions = Math.round(defaultValue(options.subdivisions, 128));
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//>>includeStart('debug', pragmas.debug);
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if (stackPartitions < 1) {
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throw new DeveloperError('options.stackPartitions cannot be less than 1');
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}
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if (slicePartitions < 0) {
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throw new DeveloperError('options.slicePartitions cannot be less than 0');
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}
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if (subdivisions < 0) {
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throw new DeveloperError('options.subdivisions must be greater than or equal to zero.');
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}
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if (defined(options.offsetAttribute) && options.offsetAttribute === GeometryOffsetAttribute.TOP) {
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throw new DeveloperError('GeometryOffsetAttribute.TOP is not a supported options.offsetAttribute for this geometry.');
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}
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//>>includeEnd('debug');
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this._radii = Cartesian3.clone(radii);
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this._stackPartitions = stackPartitions;
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this._slicePartitions = slicePartitions;
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this._subdivisions = subdivisions;
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this._offsetAttribute = options.offsetAttribute;
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this._workerName = 'createEllipsoidOutlineGeometry';
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}
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/**
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* The number of elements used to pack the object into an array.
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* @type {Number}
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*/
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EllipsoidOutlineGeometry.packedLength = Cartesian3.packedLength + 4;
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/**
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* Stores the provided instance into the provided array.
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*
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* @param {EllipsoidOutlineGeometry} value The value to pack.
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* @param {Number[]} array The array to pack into.
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* @param {Number} [startingIndex=0] The index into the array at which to start packing the elements.
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*
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* @returns {Number[]} The array that was packed into
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*/
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EllipsoidOutlineGeometry.pack = function(value, array, startingIndex) {
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//>>includeStart('debug', pragmas.debug);
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if (!defined(value)) {
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throw new DeveloperError('value is required');
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}
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if (!defined(array)) {
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throw new DeveloperError('array is required');
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}
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//>>includeEnd('debug');
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startingIndex = defaultValue(startingIndex, 0);
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Cartesian3.pack(value._radii, array, startingIndex);
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startingIndex += Cartesian3.packedLength;
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array[startingIndex++] = value._stackPartitions;
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array[startingIndex++] = value._slicePartitions;
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array[startingIndex++] = value._subdivisions;
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array[startingIndex] = defaultValue(value._offsetAttribute, -1);
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return array;
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};
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var scratchRadii = new Cartesian3();
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var scratchOptions = {
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radii : scratchRadii,
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stackPartitions : undefined,
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slicePartitions : undefined,
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subdivisions : undefined,
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offsetAttribute : undefined
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};
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/**
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* Retrieves an instance from a packed array.
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*
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* @param {Number[]} array The packed array.
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* @param {Number} [startingIndex=0] The starting index of the element to be unpacked.
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* @param {EllipsoidOutlineGeometry} [result] The object into which to store the result.
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* @returns {EllipsoidOutlineGeometry} The modified result parameter or a new EllipsoidOutlineGeometry instance if one was not provided.
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*/
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EllipsoidOutlineGeometry.unpack = function(array, startingIndex, result) {
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//>>includeStart('debug', pragmas.debug);
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if (!defined(array)) {
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throw new DeveloperError('array is required');
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}
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//>>includeEnd('debug');
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startingIndex = defaultValue(startingIndex, 0);
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var radii = Cartesian3.unpack(array, startingIndex, scratchRadii);
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startingIndex += Cartesian3.packedLength;
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var stackPartitions = array[startingIndex++];
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var slicePartitions = array[startingIndex++];
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var subdivisions = array[startingIndex++];
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var offsetAttribute = array[startingIndex];
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if (!defined(result)) {
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scratchOptions.stackPartitions = stackPartitions;
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scratchOptions.slicePartitions = slicePartitions;
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scratchOptions.subdivisions = subdivisions;
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scratchOptions.offsetAttribute = offsetAttribute === -1 ? undefined : offsetAttribute;
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return new EllipsoidOutlineGeometry(scratchOptions);
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}
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result._radii = Cartesian3.clone(radii, result._radii);
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result._stackPartitions = stackPartitions;
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result._slicePartitions = slicePartitions;
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result._subdivisions = subdivisions;
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result._offsetAttribute = offsetAttribute === -1 ? undefined : offsetAttribute;
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return result;
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};
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/**
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* Computes the geometric representation of an outline of an ellipsoid, including its vertices, indices, and a bounding sphere.
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*
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* @param {EllipsoidOutlineGeometry} ellipsoidGeometry A description of the ellipsoid outline.
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* @returns {Geometry|undefined} The computed vertices and indices.
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*/
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EllipsoidOutlineGeometry.createGeometry = function(ellipsoidGeometry) {
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var radii = ellipsoidGeometry._radii;
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if ((radii.x <= 0) || (radii.y <= 0) || (radii.z <= 0)) {
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return;
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}
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var ellipsoid = Ellipsoid.fromCartesian3(radii);
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var stackPartitions = ellipsoidGeometry._stackPartitions;
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var slicePartitions = ellipsoidGeometry._slicePartitions;
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var subdivisions = ellipsoidGeometry._subdivisions;
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var indicesSize = subdivisions * (stackPartitions + slicePartitions - 1);
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var positionSize = indicesSize - slicePartitions + 2;
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var positions = new Float64Array(positionSize * 3);
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var indices = IndexDatatype.createTypedArray(positionSize, indicesSize * 2);
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var i;
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var j;
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var theta;
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var phi;
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var cosPhi;
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var sinPhi;
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var index = 0;
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var cosTheta = new Array(subdivisions);
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var sinTheta = new Array(subdivisions);
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for (i = 0; i < subdivisions; i++) {
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theta = CesiumMath.TWO_PI * i / subdivisions;
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cosTheta[i] = cos(theta);
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sinTheta[i] = sin(theta);
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}
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for (i = 1; i < stackPartitions; i++) {
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phi = Math.PI * i / stackPartitions;
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cosPhi = cos(phi);
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sinPhi = sin(phi);
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for (j = 0; j < subdivisions; j++) {
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positions[index++] = radii.x * cosTheta[j] * sinPhi;
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positions[index++] = radii.y * sinTheta[j] * sinPhi;
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positions[index++] = radii.z * cosPhi;
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}
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}
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cosTheta.length = slicePartitions;
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sinTheta.length = slicePartitions;
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for (i = 0; i < slicePartitions; i++) {
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theta = CesiumMath.TWO_PI * i / slicePartitions;
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cosTheta[i] = cos(theta);
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sinTheta[i] = sin(theta);
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}
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positions[index++] = 0;
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positions[index++] = 0;
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positions[index++] = radii.z;
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for (i = 1; i < subdivisions; i++) {
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phi = Math.PI * i / subdivisions;
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cosPhi = cos(phi);
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sinPhi = sin(phi);
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for (j = 0; j < slicePartitions; j++) {
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positions[index++] = radii.x * cosTheta[j] * sinPhi;
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positions[index++] = radii.y * sinTheta[j] * sinPhi;
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positions[index++] = radii.z * cosPhi;
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}
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}
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positions[index++] = 0;
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positions[index++] = 0;
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positions[index++] = -radii.z;
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index = 0;
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for (i = 0; i < stackPartitions - 1; ++i) {
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var topRowOffset = (i * subdivisions);
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for (j = 0; j < subdivisions - 1; ++j) {
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indices[index++] = topRowOffset + j;
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indices[index++] = topRowOffset + j + 1;
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}
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indices[index++] = topRowOffset + subdivisions - 1;
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indices[index++] = topRowOffset;
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}
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var sliceOffset = subdivisions * (stackPartitions - 1);
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for (j = 1; j < slicePartitions + 1; ++j) {
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indices[index++] = sliceOffset;
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indices[index++] = sliceOffset + j;
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}
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for (i = 0; i < subdivisions - 2; ++i) {
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var topOffset = (i * slicePartitions) + 1 + sliceOffset;
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var bottomOffset = ((i + 1) * slicePartitions) + 1 + sliceOffset;
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for (j = 0; j < slicePartitions - 1; ++j) {
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indices[index++] = bottomOffset + j;
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indices[index++] = topOffset + j;
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}
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indices[index++] = bottomOffset + slicePartitions - 1;
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indices[index++] = topOffset + slicePartitions - 1;
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}
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var lastPosition = positions.length / 3 - 1;
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for (j = lastPosition - 1; j > lastPosition - slicePartitions - 1; --j) {
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indices[index++] = lastPosition;
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indices[index++] = j;
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}
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var attributes = new GeometryAttributes({
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position: new GeometryAttribute({
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componentDatatype : ComponentDatatype.DOUBLE,
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componentsPerAttribute : 3,
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values : positions
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})
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});
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if (defined(ellipsoidGeometry._offsetAttribute)) {
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var length = positions.length;
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var applyOffset = new Uint8Array(length / 3);
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var offsetValue = ellipsoidGeometry._offsetAttribute === GeometryOffsetAttribute.NONE ? 0 : 1;
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arrayFill(applyOffset, offsetValue);
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attributes.applyOffset = new GeometryAttribute({
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componentDatatype : ComponentDatatype.UNSIGNED_BYTE,
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componentsPerAttribute : 1,
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values: applyOffset
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});
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}
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return new Geometry({
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attributes : attributes,
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indices : indices,
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primitiveType : PrimitiveType.LINES,
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boundingSphere : BoundingSphere.fromEllipsoid(ellipsoid),
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offsetAttribute : ellipsoidGeometry._offsetAttribute
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});
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};
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return EllipsoidOutlineGeometry;
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});
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