117 lines
5.3 KiB
TypeScript
117 lines
5.3 KiB
TypeScript
module es {
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/**
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* 移动器使用的帮助器类，用于管理触发器碰撞器交互并调用itriggerlistener
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*/
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export class ColliderTriggerHelper {
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private _entity: Entity;
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/** 存储当前帧中发生的所有活动交点对 */
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private _activeTriggerIntersections: Set<Pair<Collider>> = new Set();
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/** 存储前一帧的交点对，这样我们就可以在移动这一帧后检测到退出 */
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private _previousTriggerIntersections: Set<Pair<Collider>> = new Set();
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private _tempTriggerList: ITriggerListener[] = [];
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constructor(entity: Entity) {
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this._entity = entity;
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}
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/**
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* update应该在实体被移动后被调用，它将处理任何与Colllider重叠的ITriggerListeners。
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* 它将处理任何与Collider重叠的ITriggerListeners。
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*/
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public update() {
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// 对所有实体.colliders进行重叠检查，这些实体.colliders是触发器，与所有宽相碰撞器，无论是否触发器。
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// 任何重叠都会导致触发事件
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let colliders = this._entity.getComponents(Collider);
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for (let i = 0; i < colliders.length; i++) {
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let collider = colliders[i];
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let neighbors = Physics.boxcastBroadphase(collider.bounds, collider.collidesWithLayers);
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for (let j = 0; j < neighbors.size; j++) {
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let neighbor = neighbors[j];
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// 我们至少需要一个碰撞器作为触发器
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if (!collider.isTrigger && !neighbor.isTrigger)
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continue;
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if (collider.overlaps(neighbor)) {
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let pair = new Pair<Collider>(collider, neighbor);
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// 如果我们的某一个集合中已经有了这个对子（前一个或当前的触发交叉点），就不要调用输入事件了
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let shouldReportTriggerEvent = !this._activeTriggerIntersections.has(pair) &&
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!this._previousTriggerIntersections.has(pair);
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if (shouldReportTriggerEvent)
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this.notifyTriggerListeners(pair, true);
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this._activeTriggerIntersections.add(pair);
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}
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}
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}
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ListPool.free(colliders);
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this.checkForExitedColliders();
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}
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private checkForExitedColliders() {
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// 删除所有与此帧交互的触发器，留下我们退出的触发器
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this.excepthWith(this._previousTriggerIntersections, this._activeTriggerIntersections);
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for (let i = 0; i < this._previousTriggerIntersections.size; i++) {
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this.notifyTriggerListeners(this._previousTriggerIntersections[i], false)
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}
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this._previousTriggerIntersections.clear();
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// 添加所有当前激活的触发器
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this.unionWith(this._previousTriggerIntersections, this._activeTriggerIntersections);
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// 清空活动集，为下一帧做准备
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this._activeTriggerIntersections.clear();
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}
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private excepthWith(previous: Set<Pair<Collider>>, active: Set<Pair<Collider>>){
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for (let i = 0; i < previous.size; i ++){
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let previousDATA: Pair<Collider> = previous[i];
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for (let j = 0; j < active.size; j ++){
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let activeDATA: Pair<Collider> = active[j];
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if (activeDATA.equals(previousDATA))
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previous.delete(previousDATA);
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}
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}
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}
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private unionWith(previous: Set<Pair<Collider>>, active: Set<Pair<Collider>>) {
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for (let i = 0; i < this._activeTriggerIntersections.size; i ++) {
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if (!this._previousTriggerIntersections.has(this._activeTriggerIntersections[i]))
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this._previousTriggerIntersections.add(this._activeTriggerIntersections[i]);
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}
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}
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private notifyTriggerListeners(collisionPair: Pair<Collider>, isEntering: boolean) {
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TriggerListenerHelper.getITriggerListener(collisionPair.first.entity, this._tempTriggerList);
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for (let i = 0; i < this._tempTriggerList.length; i++) {
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if (isEntering) {
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this._tempTriggerList[i].onTriggerEnter(collisionPair.second, collisionPair.first);
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} else {
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this._tempTriggerList[i].onTriggerExit(collisionPair.second, collisionPair.first);
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}
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this._tempTriggerList.length = 0;
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if (collisionPair.second.entity) {
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TriggerListenerHelper.getITriggerListener(collisionPair.second.entity, this._tempTriggerList);
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for (let i = 0; i < this._tempTriggerList.length; i++) {
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if (isEntering) {
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this._tempTriggerList[i].onTriggerEnter(collisionPair.first, collisionPair.second);
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} else {
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this._tempTriggerList[i].onTriggerExit(collisionPair.first, collisionPair.second);
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}
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}
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this._tempTriggerList.length = 0;
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}
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}
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}
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}
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}
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