* 清空所有子 Transform 组件 * * 移除所有子对象的引用，但不销毁子对象本身。

* completeShapes * @private * @param {*} arr shapes

* 当监听的属性变化时候调用 * * called while the observed component props change.

* Copies pointer {@link FederatedPointerEvent} data from {@code from} into {@code to}. * * The following properties are copied: * + pointerId

* create a quaternion from euler * @private * @param {Array} values origin euler * @return {Array} quaternion

* 销毁游戏对象 * * 递归销毁所有子对象，移除所有组件，清理所有资源。 * 销毁后的对象不应再被使用。

remove all system on this game

Finds a physics constraint by comparing each physics constraint's name. It is more efficient to cache the results of this * method than to call it

* format response * @private * @param {*} xhr xhr object * @return {object}

Uses {@link #trackTime} to compute the `animationTime`, which is between {@link #animationStart} * and {@link #animationEnd}. When the `trackTime`

@return May be null.

Returns all attachments in this skin.

* a * @private * @param {*} pt1 a * @param {*} pt2 a * @param {*} pt3 a * @param {*} pt4 a * @return {*}

Returns the axis aligned bounding box (AABB) of the region and mesh attachments for the current pose. * @param offset An output value, the distance

* a * @param {*} fontData a * @return {*}

* 获取aT处的斜率 * @private * @param {number} aT 三次贝塞尔曲线的t自变量 * @param {number} aA1 控制分量1 * @param {number} aA2 控制分量2 * @return {number} 三次贝塞尔公式的导数

* get a transform property * @private * @param {*} elem element node * @param {*} data multidimensional value property data * @param {*} container

The magnitude (always positive) of the world scale X, calculated using {@link #a} and {@link #c}.

* Finds the Container that is the target of a event at the given coordinates. * * The passed (x,y) coordinates are in the world space above this

* add main render method to ticker * @remarks * the method added to ticker will called in each requestAnimationFrame, * 1. call update method

Returns the first bounding box attachment that contains any part of the line segment, or null. When doing many checks, it * is usually more efficie