import { Object3D } from './Object3D';



const __ = {

	private: Symbol('private'),

}



/**
 * AttachedPoint - 挂接点
 * 
 * 提供挂点物体能力，挂点物体可以忽略父物体的缩放和旋转，但仍会同步相对位置。
 * 
 * @class AttachedPoint
 * @memberof THING
 * @extends THING.Object3D
 * @public
 */
class AttachedPoint extends Object3D {



	static defaultTagArray = ['Dummy'];



	/**

	 * 提供挂点物体能力。挂点物体可以忽略父物体的缩放和旋转，但是仍旧会同步相对位置。

	 * @param {object} param 初始参数。

	 */

	constructor(param = {}) {

		super(param);



		// Before super class could set local position in constructor, so we need to define out of private field

		this._offset = this._offset || null;



		this[__.private] = {};

		let _private = this[__.private];



		_private.object = null;



		this.node.setAttribute('MatrixUpdateMode', 'EliminateParentRS')

	}



	// #region Overrides



	onLoadResource(options, resolve, reject) {

		resolve();

	}



	/**

	 * 获取/设置 相对父物体坐标系下位置

	 * @type {Array<number>}

	 * @public

	 */

	// get localPosition() {

	// 	return this._offset;

	// }

	// set localPosition(value) {

	// 	this._offset = value.slice(0);

	// }



	/**

	 * 判断是否为挂点物体类或继承于此类

	 * @type {boolean}

	 * @example

	 * let point = new THING.AttachedPoint();

	 * let ret = point.isAttachedPoint;

	 * // @expect(ret == true);

	 * @public

	 */

	get isAttachedPoint() {

		return true;

	}



}



export { AttachedPoint }