@openhps/core/src/three/geometries/TorusGeometry.js

Open Hybrid Positioning System - Core component

"use strict";

Object.defineProperty(exports, "__esModule", {
  value: true
});
exports.TorusGeometry = void 0;
var _BufferGeometry = require("../core/BufferGeometry.js");
var _BufferAttribute = require("../core/BufferAttribute.js");
var _Vector = require("../math/Vector3.js");
/**
 * A geometry class for representing an torus.
 *
 * ```js
 * const geometry = new THREE.TorusGeometry( 10, 3, 16, 100 );
 * const material = new THREE.MeshBasicMaterial( { color: 0xffff00 } );
 * const torus = new THREE.Mesh( geometry, material );
 * scene.add( torus );
 * ```
 *
 * @augments BufferGeometry
 */
class TorusGeometry extends _BufferGeometry.BufferGeometry {
  /**
   * Constructs a new torus geometry.
   *
   * @param {number} [radius=1] - Radius of the torus, from the center of the torus to the center of the tube.
   * @param {number} [tube=0.4] - Radius of the tube. Must be smaller than `radius`.
   * @param {number} [radialSegments=12] - The number of radial segments.
   * @param {number} [tubularSegments=48] - The number of tubular segments.
   * @param {number} [arc=Math.PI*2] - Central angle in radians.
   */
  constructor(radius = 1, tube = 0.4, radialSegments = 12, tubularSegments = 48, arc = Math.PI * 2) {
    super();
    this.type = 'TorusGeometry';

    /**
     * Holds the constructor parameters that have been
     * used to generate the geometry. Any modification
     * after instantiation does not change the geometry.
     *
     * @type {Object}
     */
    this.parameters = {
      radius: radius,
      tube: tube,
      radialSegments: radialSegments,
      tubularSegments: tubularSegments,
      arc: arc
    };
    radialSegments = Math.floor(radialSegments);
    tubularSegments = Math.floor(tubularSegments);

    // buffers

    const indices = [];
    const vertices = [];
    const normals = [];
    const uvs = [];

    // helper variables

    const center = new _Vector.Vector3();
    const vertex = new _Vector.Vector3();
    const normal = new _Vector.Vector3();

    // generate vertices, normals and uvs

    for (let j = 0; j <= radialSegments; j++) {
      for (let i = 0; i <= tubularSegments; i++) {
        const u = i / tubularSegments * arc;
        const v = j / radialSegments * Math.PI * 2;

        // vertex

        vertex.x = (radius + tube * Math.cos(v)) * Math.cos(u);
        vertex.y = (radius + tube * Math.cos(v)) * Math.sin(u);
        vertex.z = tube * Math.sin(v);
        vertices.push(vertex.x, vertex.y, vertex.z);

        // normal

        center.x = radius * Math.cos(u);
        center.y = radius * Math.sin(u);
        normal.subVectors(vertex, center).normalize();
        normals.push(normal.x, normal.y, normal.z);

        // uv

        uvs.push(i / tubularSegments);
        uvs.push(j / radialSegments);
      }
    }

    // generate indices

    for (let j = 1; j <= radialSegments; j++) {
      for (let i = 1; i <= tubularSegments; i++) {
        // indices

        const a = (tubularSegments + 1) * j + i - 1;
        const b = (tubularSegments + 1) * (j - 1) + i - 1;
        const c = (tubularSegments + 1) * (j - 1) + i;
        const d = (tubularSegments + 1) * j + i;

        // faces

        indices.push(a, b, d);
        indices.push(b, c, d);
      }
    }

    // build geometry

    this.setIndex(indices);
    this.setAttribute('position', new _BufferAttribute.Float32BufferAttribute(vertices, 3));
    this.setAttribute('normal', new _BufferAttribute.Float32BufferAttribute(normals, 3));
    this.setAttribute('uv', new _BufferAttribute.Float32BufferAttribute(uvs, 2));
  }
  copy(source) {
    super.copy(source);
    this.parameters = Object.assign({}, source.parameters);
    return this;
  }

  /**
   * Factory method for creating an instance of this class from the given
   * JSON object.
   *
   * @param {Object} data - A JSON object representing the serialized geometry.
   * @return {TorusGeometry} A new instance.
   */
  static fromJSON(data) {
    return new TorusGeometry(data.radius, data.tube, data.radialSegments, data.tubularSegments, data.arc);
  }
}
exports.TorusGeometry = TorusGeometry;