@openhps/core/dist/esm/three/helpers/Box3Helper.js

Open Hybrid Positioning System - Core component

import { LineSegments } from '../objects/LineSegments.js';
import { LineBasicMaterial } from '../materials/LineBasicMaterial.js';
import { BufferAttribute, Float32BufferAttribute } from '../core/BufferAttribute.js';
import { BufferGeometry } from '../core/BufferGeometry.js';

/**
 * A helper object to visualize an instance of {@link Box3}.
 *
 * ```js
 * const box = new THREE.Box3();
 * box.setFromCenterAndSize( new THREE.Vector3( 1, 1, 1 ), new THREE.Vector3( 2, 1, 3 ) );
 *
 * const helper = new THREE.Box3Helper( box, 0xffff00 );
 * scene.add( helper )
 * ```
 *
 * @augments LineSegments
 */
class Box3Helper extends LineSegments {
  /**
   * Constructs a new box3 helper.
   *
   * @param {Box3} box - The box to visualize.
   * @param {number|Color|string} [color=0xffff00] - The box's color.
   */
  constructor(box, color = 0xffff00) {
    const indices = new Uint16Array([0, 1, 1, 2, 2, 3, 3, 0, 4, 5, 5, 6, 6, 7, 7, 4, 0, 4, 1, 5, 2, 6, 3, 7]);
    const positions = [1, 1, 1, -1, 1, 1, -1, -1, 1, 1, -1, 1, 1, 1, -1, -1, 1, -1, -1, -1, -1, 1, -1, -1];
    const geometry = new BufferGeometry();
    geometry.setIndex(new BufferAttribute(indices, 1));
    geometry.setAttribute('position', new Float32BufferAttribute(positions, 3));
    super(geometry, new LineBasicMaterial({
      color: color,
      toneMapped: false
    }));

    /**
     * The box being visualized.
     *
     * @type {Box3}
     */
    this.box = box;
    this.type = 'Box3Helper';
    this.geometry.computeBoundingSphere();
  }
  updateMatrixWorld(force) {
    const box = this.box;
    if (box.isEmpty()) return;
    box.getCenter(this.position);
    box.getSize(this.scale);
    this.scale.multiplyScalar(0.5);
    super.updateMatrixWorld(force);
  }

  /**
   * Frees the GPU-related resources allocated by this instance. Call this
   * method whenever this instance is no longer used in your app.
   */
  dispose() {
    this.geometry.dispose();
    this.material.dispose();
  }
}
export { Box3Helper };