/**
 * Cesium - https://github.com/CesiumGS/cesium
 *
 * Copyright 2011-2020 Cesium Contributors
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 * Columbus View (Pat. Pend.)
 *
 * Portions licensed separately.
 * See https://github.com/CesiumGS/cesium/blob/master/LICENSE.md for full licensing details.
 */

define(['./when-208fe5b0', './Transforms-9651fa9c', './Cartesian2-e9bb1bb3', './Check-5e798bbf', './ComponentDatatype-cc8f5f00', './GeometryAttribute-fbe4b0b6', './GeometryAttributes-b0b294d8', './Math-56f06cd5', './RuntimeError-7f634f5d', './WebGLConstants-5e2a49ab'], function (when, Transforms, Cartesian2, Check, ComponentDatatype, GeometryAttribute, GeometryAttributes, _Math, RuntimeError, WebGLConstants) { 'use strict';

  /**
   * Describes geometry representing the outline of a plane centered at the origin, with a unit width and length.
   *
   * @alias PlaneOutlineGeometry
   * @constructor
   *
   */
  function PlaneOutlineGeometry() {
    this._workerName = "createPlaneOutlineGeometry";
  }

  /**
   * The number of elements used to pack the object into an array.
   * @type {Number}
   */
  PlaneOutlineGeometry.packedLength = 0;

  /**
   * Stores the provided instance into the provided array.
   *
   * @param {PlaneOutlineGeometry} value The value to pack.
   * @param {Number[]} array The array to pack into.
   *
   * @returns {Number[]} The array that was packed into
   */
  PlaneOutlineGeometry.pack = function (value, array) {
    //>>includeStart('debug', pragmas.debug);
    Check.Check.defined("value", value);
    Check.Check.defined("array", array);
    //>>includeEnd('debug');

    return array;
  };

  /**
   * 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 {PlaneOutlineGeometry} [result] The object into which to store the result.
   * @returns {PlaneOutlineGeometry} The modified result parameter or a new PlaneOutlineGeometry instance if one was not provided.
   */
  PlaneOutlineGeometry.unpack = function (array, startingIndex, result) {
    //>>includeStart('debug', pragmas.debug);
    Check.Check.defined("array", array);
    //>>includeEnd('debug');

    if (!when.defined(result)) {
      return new PlaneOutlineGeometry();
    }

    return result;
  };

  var min = new Cartesian2.Cartesian3(-0.5, -0.5, 0.0);
  var max = new Cartesian2.Cartesian3(0.5, 0.5, 0.0);

  /**
   * Computes the geometric representation of an outline of a plane, including its vertices, indices, and a bounding sphere.
   *
   * @returns {Geometry|undefined} The computed vertices and indices.
   */
  PlaneOutlineGeometry.createGeometry = function () {
    var attributes = new GeometryAttributes.GeometryAttributes();
    var indices = new Uint16Array(4 * 2);
    var positions = new Float64Array(4 * 3);

    positions[0] = min.x;
    positions[1] = min.y;
    positions[2] = min.z;
    positions[3] = max.x;
    positions[4] = min.y;
    positions[5] = min.z;
    positions[6] = max.x;
    positions[7] = max.y;
    positions[8] = min.z;
    positions[9] = min.x;
    positions[10] = max.y;
    positions[11] = min.z;

    attributes.position = new GeometryAttribute.GeometryAttribute({
      componentDatatype: ComponentDatatype.ComponentDatatype.DOUBLE,
      componentsPerAttribute: 3,
      values: positions,
    });

    indices[0] = 0;
    indices[1] = 1;
    indices[2] = 1;
    indices[3] = 2;
    indices[4] = 2;
    indices[5] = 3;
    indices[6] = 3;
    indices[7] = 0;

    return new GeometryAttribute.Geometry({
      attributes: attributes,
      indices: indices,
      primitiveType: GeometryAttribute.PrimitiveType.LINES,
      boundingSphere: new Transforms.BoundingSphere(Cartesian2.Cartesian3.ZERO, Math.sqrt(2.0)),
    });
  };

  function createPlaneOutlineGeometry(planeGeometry, offset) {
    if (when.defined(offset)) {
      planeGeometry = PlaneOutlineGeometry.unpack(planeGeometry, offset);
    }
    return PlaneOutlineGeometry.createGeometry(planeGeometry);
  }

  return createPlaneOutlineGeometry;

});
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