@openhps/core/dist/esm/three/geometries/PlaneGeometry.js

Open Hybrid Positioning System - Core component

import { BufferGeometry } from '../core/BufferGeometry.js';
import { Float32BufferAttribute } from '../core/BufferAttribute.js';

/**
 * A geometry class for representing a plane.
 *
 * ```js
 * const geometry = new THREE.PlaneGeometry( 1, 1 );
 * const material = new THREE.MeshBasicMaterial( { color: 0xffff00, side: THREE.DoubleSide } );
 * const plane = new THREE.Mesh( geometry, material );
 * scene.add( plane );
 * ```
 *
 * @augments BufferGeometry
 */
class PlaneGeometry extends BufferGeometry {
  /**
   * Constructs a new plane geometry.
   *
   * @param {number} [width=1] - The width along the X axis.
   * @param {number} [height=1] - The height along the Y axis
   * @param {number} [widthSegments=1] - The number of segments along the X axis.
   * @param {number} [heightSegments=1] - The number of segments along the Y axis.
   */
  constructor(width = 1, height = 1, widthSegments = 1, heightSegments = 1) {
    super();
    this.type = 'PlaneGeometry';

    /**
     * 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 = {
      width: width,
      height: height,
      widthSegments: widthSegments,
      heightSegments: heightSegments
    };
    const width_half = width / 2;
    const height_half = height / 2;
    const gridX = Math.floor(widthSegments);
    const gridY = Math.floor(heightSegments);
    const gridX1 = gridX + 1;
    const gridY1 = gridY + 1;
    const segment_width = width / gridX;
    const segment_height = height / gridY;

    //

    const indices = [];
    const vertices = [];
    const normals = [];
    const uvs = [];
    for (let iy = 0; iy < gridY1; iy++) {
      const y = iy * segment_height - height_half;
      for (let ix = 0; ix < gridX1; ix++) {
        const x = ix * segment_width - width_half;
        vertices.push(x, -y, 0);
        normals.push(0, 0, 1);
        uvs.push(ix / gridX);
        uvs.push(1 - iy / gridY);
      }
    }
    for (let iy = 0; iy < gridY; iy++) {
      for (let ix = 0; ix < gridX; ix++) {
        const a = ix + gridX1 * iy;
        const b = ix + gridX1 * (iy + 1);
        const c = ix + 1 + gridX1 * (iy + 1);
        const d = ix + 1 + gridX1 * iy;
        indices.push(a, b, d);
        indices.push(b, c, d);
      }
    }
    this.setIndex(indices);
    this.setAttribute('position', new Float32BufferAttribute(vertices, 3));
    this.setAttribute('normal', new Float32BufferAttribute(normals, 3));
    this.setAttribute('uv', new 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 {PlaneGeometry} A new instance.
   */
  static fromJSON(data) {
    return new PlaneGeometry(data.width, data.height, data.widthSegments, data.heightSegments);
  }
}
export { PlaneGeometry };