text: /*global define*/
  define([
          './Cartesian3',
          './defaultValue',
          './defined',
          './defineProperties',
          './DeveloperError',
          './EllipseGeometry',
          './Ellipsoid',
          './Math',
          './VertexFormat'
      ], function(
          Cartesian3,
          defaultValue,
          defined,
          defineProperties,
          DeveloperError,
          EllipseGeometry,
          Ellipsoid,
          CesiumMath,
          VertexFormat) {
      'use strict';
  
      /**
       * A description of a circle on the ellipsoid. Circle geometry can be rendered with both {@link Primitive} and {@link GroundPrimitive}.
       *
       * @alias CircleGeometry
       * @constructor
       *
       * @param {Object} options Object with the following properties:
       * @param {Cartesian3} options.center The circle's center point in the fixed frame.
       * @param {Number} options.radius The radius in meters.
       * @param {Ellipsoid} [options.ellipsoid=Ellipsoid.WGS84] The ellipsoid the circle will be on.
       * @param {Number} [options.height=0.0] The distance in meters between the circle and the ellipsoid surface.
       * @param {Number} [options.granularity=0.02] The angular distance between points on the circle in radians.
       * @param {VertexFormat} [options.vertexFormat=VertexFormat.DEFAULT] The vertex attributes to be computed.
       * @param {Number} [options.extrudedHeight=0.0] The distance in meters between the circle's extruded face and the ellipsoid surface.
       * @param {Number} [options.stRotation=0.0] The rotation of the texture coordinates, in radians. A positive rotation is counter-clockwise.
       *
       * @exception {DeveloperError} radius must be greater than zero.
       * @exception {DeveloperError} granularity must be greater than zero.
       *
       * @see CircleGeometry.createGeometry
       * @see Packable
       *
       * @example
       * // Create a circle.
       * var circle = new Cesium.CircleGeometry({
       *   center : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
       *   radius : 100000.0
       * });
       * var geometry = Cesium.CircleGeometry.createGeometry(circle);
       */
      function CircleGeometry(options) {
          options = defaultValue(options, defaultValue.EMPTY_OBJECT);
          var radius = options.radius;
  
          //>>includeStart('debug', pragmas.debug);
          if (!defined(radius)) {
              throw new DeveloperError('radius is required.');
          }
          //>>includeEnd('debug');
  
          var ellipseGeometryOptions = {
              center : options.center,
              semiMajorAxis : radius,
              semiMinorAxis : radius,
              ellipsoid : options.ellipsoid,
              height : options.height,
              extrudedHeight : options.extrudedHeight,
              granularity : options.granularity,
              vertexFormat : options.vertexFormat,
              stRotation : options.stRotation
          };
          this._ellipseGeometry = new EllipseGeometry(ellipseGeometryOptions);
          this._workerName = 'createCircleGeometry';
      }
  
      /**
       * The number of elements used to pack the object into an array.
       * @type {Number}
       */
      CircleGeometry.packedLength = EllipseGeometry.packedLength;
  
      /**
       * Stores the provided instance into the provided array.
       *
       * @param {CircleGeometry} 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.
       */
      CircleGeometry.pack = function(value, array, startingIndex) {
          //>>includeStart('debug', pragmas.debug);
          if (!defined(value)) {
              throw new DeveloperError('value is required');
          }
          //>>includeEnd('debug');
          EllipseGeometry.pack(value._ellipseGeometry, array, startingIndex);
      };
  
      var scratchEllipseGeometry = new EllipseGeometry({
          center : new Cartesian3(),
          semiMajorAxis : 1.0,
          semiMinorAxis : 1.0
      });
      var scratchOptions = {
          center : new Cartesian3(),
          radius : undefined,
          ellipsoid : Ellipsoid.clone(Ellipsoid.UNIT_SPHERE),
          height : undefined,
          extrudedHeight : undefined,
          granularity : undefined,
          vertexFormat : new VertexFormat(),
          stRotation : undefined,
          semiMajorAxis : undefined,
          semiMinorAxis : 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 {CircleGeometry} [result] The object into which to store the result.
       * @returns {CircleGeometry} The modified result parameter or a new CircleGeometry instance if one was not provided.
       */
      CircleGeometry.unpack = function(array, startingIndex, result) {
          var ellipseGeometry = EllipseGeometry.unpack(array, startingIndex, scratchEllipseGeometry);
          scratchOptions.center = Cartesian3.clone(ellipseGeometry._center, scratchOptions.center);
          scratchOptions.ellipsoid = Ellipsoid.clone(ellipseGeometry._ellipsoid, scratchOptions.ellipsoid);
          scratchOptions.height = ellipseGeometry._height;
          scratchOptions.extrudedHeight = ellipseGeometry._extrudedHeight;
          scratchOptions.granularity = ellipseGeometry._granularity;
          scratchOptions.vertexFormat = VertexFormat.clone(ellipseGeometry._vertexFormat, scratchOptions.vertexFormat);
          scratchOptions.stRotation = ellipseGeometry._stRotation;
  
          if (!defined(result)) {
              scratchOptions.radius = ellipseGeometry._semiMajorAxis;
              return new CircleGeometry(scratchOptions);
          }
  
          scratchOptions.semiMajorAxis = ellipseGeometry._semiMajorAxis;
          scratchOptions.semiMinorAxis = ellipseGeometry._semiMinorAxis;
          result._ellipseGeometry = new EllipseGeometry(scratchOptions);
          return result;
      };
  
      /**
       * Computes the geometric representation of a circle on an ellipsoid, including its vertices, indices, and a bounding sphere.
       *
       * @param {CircleGeometry} circleGeometry A description of the circle.
       * @returns {Geometry|undefined} The computed vertices and indices.
       */
      CircleGeometry.createGeometry = function(circleGeometry) {
          return EllipseGeometry.createGeometry(circleGeometry._ellipseGeometry);
      };
  
      /**
       * @private
       */
      CircleGeometry.createShadowVolume = function(circleGeometry, minHeightFunc, maxHeightFunc) {
          var granularity = circleGeometry._ellipseGeometry._granularity;
          var ellipsoid = circleGeometry._ellipseGeometry._ellipsoid;
  
          var minHeight = minHeightFunc(granularity, ellipsoid);
          var maxHeight = maxHeightFunc(granularity, ellipsoid);
  
          return new CircleGeometry({
              center : circleGeometry._ellipseGeometry._center,
              radius : circleGeometry._ellipseGeometry._semiMajorAxis,
              ellipsoid : ellipsoid,
              stRotation : circleGeometry._ellipseGeometry._stRotation,
              granularity : granularity,
              extrudedHeight : minHeight,
              height : maxHeight,
              vertexFormat : VertexFormat.POSITION_ONLY
          });
      };
      
      defineProperties(CircleGeometry.prototype, {
          /**
           * @private
           */
          rectangle : {
              get : function() {
                  return this._ellipseGeometry.rectangle;
              }
          }
      });
  
      return CircleGeometry;
  });
  