guanyun3d/public/lib/Cesium-1.99/Workers/createCircleGeometry.js

/**
 * @license
 * Cesium - https://github.com/CesiumGS/cesium
 * Version 1.99
 *
 * Copyright 2011-2022 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/main/LICENSE.md for full licensing details.
 */

define(['./Matrix3-ea964448', './Check-40d84a28', './defaultValue-135942ca', './EllipseGeometry-08ba4483', './VertexFormat-1d6950e1', './Math-efde0c7b', './Transforms-ac2d28a9', './Matrix2-f9f1b94b', './RuntimeError-f0dada00', './combine-462d91dd', './ComponentDatatype-ebdce3ba', './WebGLConstants-fcb70ee3', './EllipseGeometryLibrary-61eaea89', './GeometryAttribute-51d61732', './GeometryAttributes-899f8bd0', './GeometryInstance-bb34b63f', './GeometryOffsetAttribute-d3a42805', './GeometryPipeline-576f16cd', './AttributeCompression-53c7fda2', './EncodedCartesian3-4040c81e', './IndexDatatype-fa75fe25', './IntersectionTests-4ab30dca', './Plane-93af52b2'], (function (Matrix3, Check, defaultValue, EllipseGeometry, VertexFormat, Math, Transforms, Matrix2, RuntimeError, combine, ComponentDatatype, WebGLConstants, EllipseGeometryLibrary, GeometryAttribute, GeometryAttributes, GeometryInstance, GeometryOffsetAttribute, GeometryPipeline, AttributeCompression, EncodedCartesian3, IndexDatatype, IntersectionTests, Plane) { '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.
   * const circle = new Cesium.CircleGeometry({
   *   center : Cesium.Cartesian3.fromDegrees(-75.59777, 40.03883),
   *   radius : 100000.0
   * });
   * const geometry = Cesium.CircleGeometry.createGeometry(circle);
   */
  function CircleGeometry(options) {
    options = defaultValue.defaultValue(options, defaultValue.defaultValue.EMPTY_OBJECT);
    const radius = options.radius;

    //>>includeStart('debug', pragmas.debug);
    Check.Check.typeOf.number("radius", radius);
    //>>includeEnd('debug');

    const 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,
      shadowVolume: options.shadowVolume,
    };
    this._ellipseGeometry = new EllipseGeometry.EllipseGeometry(ellipseGeometryOptions);
    this._workerName = "createCircleGeometry";
  }

  /**
   * The number of elements used to pack the object into an array.
   * @type {Number}
   */
  CircleGeometry.packedLength = EllipseGeometry.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.
   *
   * @returns {Number[]} The array that was packed into
   */
  CircleGeometry.pack = function (value, array, startingIndex) {
    //>>includeStart('debug', pragmas.debug);
    Check.Check.typeOf.object("value", value);
    //>>includeEnd('debug');
    return EllipseGeometry.EllipseGeometry.pack(value._ellipseGeometry, array, startingIndex);
  };

  const scratchEllipseGeometry = new EllipseGeometry.EllipseGeometry({
    center: new Matrix3.Cartesian3(),
    semiMajorAxis: 1.0,
    semiMinorAxis: 1.0,
  });
  const scratchOptions = {
    center: new Matrix3.Cartesian3(),
    radius: undefined,
    ellipsoid: Matrix3.Ellipsoid.clone(Matrix3.Ellipsoid.UNIT_SPHERE),
    height: undefined,
    extrudedHeight: undefined,
    granularity: undefined,
    vertexFormat: new VertexFormat.VertexFormat(),
    stRotation: undefined,
    semiMajorAxis: undefined,
    semiMinorAxis: undefined,
    shadowVolume: 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) {
    const ellipseGeometry = EllipseGeometry.EllipseGeometry.unpack(
      array,
      startingIndex,
      scratchEllipseGeometry
    );
    scratchOptions.center = Matrix3.Cartesian3.clone(
      ellipseGeometry._center,
      scratchOptions.center
    );
    scratchOptions.ellipsoid = Matrix3.Ellipsoid.clone(
      ellipseGeometry._ellipsoid,
      scratchOptions.ellipsoid
    );
    scratchOptions.height = ellipseGeometry._height;
    scratchOptions.extrudedHeight = ellipseGeometry._extrudedHeight;
    scratchOptions.granularity = ellipseGeometry._granularity;
    scratchOptions.vertexFormat = VertexFormat.VertexFormat.clone(
      ellipseGeometry._vertexFormat,
      scratchOptions.vertexFormat
    );
    scratchOptions.stRotation = ellipseGeometry._stRotation;
    scratchOptions.shadowVolume = ellipseGeometry._shadowVolume;

    if (!defaultValue.defined(result)) {
      scratchOptions.radius = ellipseGeometry._semiMajorAxis;
      return new CircleGeometry(scratchOptions);
    }

    scratchOptions.semiMajorAxis = ellipseGeometry._semiMajorAxis;
    scratchOptions.semiMinorAxis = ellipseGeometry._semiMinorAxis;
    result._ellipseGeometry = new EllipseGeometry.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.EllipseGeometry.createGeometry(circleGeometry._ellipseGeometry);
  };

  /**
   * @private
   */
  CircleGeometry.createShadowVolume = function (
    circleGeometry,
    minHeightFunc,
    maxHeightFunc
  ) {
    const granularity = circleGeometry._ellipseGeometry._granularity;
    const ellipsoid = circleGeometry._ellipseGeometry._ellipsoid;

    const minHeight = minHeightFunc(granularity, ellipsoid);
    const 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.VertexFormat.POSITION_ONLY,
      shadowVolume: true,
    });
  };

  Object.defineProperties(CircleGeometry.prototype, {
    /**
     * @private
     */
    rectangle: {
      get: function () {
        return this._ellipseGeometry.rectangle;
      },
    },
    /**
     * For remapping texture coordinates when rendering CircleGeometries as GroundPrimitives.
     * @private
     */
    textureCoordinateRotationPoints: {
      get: function () {
        return this._ellipseGeometry.textureCoordinateRotationPoints;
      },
    },
  });

  function createCircleGeometry(circleGeometry, offset) {
    if (defaultValue.defined(offset)) {
      circleGeometry = CircleGeometry.unpack(circleGeometry, offset);
    }
    circleGeometry._ellipseGeometry._center = Matrix3.Cartesian3.clone(
      circleGeometry._ellipseGeometry._center
    );
    circleGeometry._ellipseGeometry._ellipsoid = Matrix3.Ellipsoid.clone(
      circleGeometry._ellipseGeometry._ellipsoid
    );
    return CircleGeometry.createGeometry(circleGeometry);
  }

  return createCircleGeometry;

}));