Method find

packages/core/src/ECS/Core/Query/CompiledQuery.ts:322–347

* 查找满足条件的实体 * * Find entity matching predicate. * * @param predicate 查找条件 | Find predicate * @returns 找到的实体或 undefined | Found entity or undefined

(
        predicate: (entity: Entity, ...components: InstanceTypes<T>) => boolean
    )

     * @returns 找到的实体或 undefined | Found entity or undefined
     */
    public find(
        predicate: (entity: Entity, ...components: InstanceTypes<T>) => boolean
    ): Entity | undefined {
        const entities = this.entities;
        const componentTypes = this._componentTypes;
        const typeCount = componentTypes.length;

        for (let i = 0, len = entities.length; i < len; i++) {
            const entity = entities[i]!;
            const components: Component[] = new Array(typeCount);

            for (let j = 0; j < typeCount; j++) {
                const component = entity.getComponent(componentTypes[j]!);
                if (!component) {
                    continue;
                }
                components[j] = component;
            }

            if (predicate(entity, ...(components as InstanceTypes<T>))) {
                return entity;
            }
        }

        return undefined;
    }

    /**
     * 检查是否有任何实体匹配