Method addSystemToComponentIndex

packages/core/src/ECS/Scene.ts:741–751

* 将系统添加到指定组件的索引 * * Add system to the index for a specific component type. * * @param componentType 组件类型 | Component type * @param system 系统 | System

(componentType: ComponentType, system: EntitySystem)

     * @param system 系统 | System
     */
    private addSystemToComponentIndex(componentType: ComponentType, system: EntitySystem): void {
        const componentId = this.componentRegistry.getBitIndex(componentType);
        let systems = this._componentIdToSystems.get(componentId);

        if (!systems) {
            systems = new Set();
            this._componentIdToSystems.set(componentId, systems);
        }

        systems.add(system);
    }

    /**
     * 从组件索引中移除系统