import { System } from '../core/System';
import { GameEntity } from '../core/Entity';
export interface CollisionPair {
    a: GameEntity;
    b: GameEntity;
    /** 碰撞法线 (从 a 指向 b) */
    normalX: number;
    normalY: number;
    /** 穿透深度 */
    depth: number;
}
export declare class PhysicsSystem extends System {
    static priority: number;
    /** 重力 */
    gravity: {
        x: number;
        y: number;
    };
    /** 当前帧的碰撞对 */
    private collisions;
    /** 碰撞回调 */
    private collisionCallbacks;
    onUpdate(dt: number): void;
    /**
     * 检查两个实体是否应该碰撞
     */
    private shouldCollide;
    /**
     * 检测两个实体之间的碰撞
     */
    private checkCollision;
    /**
     * 圆形 vs 圆形碰撞检测
     */
    private circleVsCircle;
    /**
     * 矩形 vs 矩形碰撞检测 (AABB)
     */
    private rectVsRect;
    /**
     * 圆形 vs 矩形碰撞检测
     */
    private circleVsRect;
    /**
     * 获取当前帧的所有碰撞
     */
    getCollisions(): readonly CollisionPair[];
    /**
     * 检查实体是否与其他实体碰撞
     */
    isColliding(entity: GameEntity): boolean;
    /**
     * 获取与指定实体碰撞的所有实体
     */
    getCollidingWith(entity: GameEntity): GameEntity[];
    /**
     * 注册碰撞回调
     */
    onCollision(callback: (pair: CollisionPair) => void): () => void;
    /**
     * 点是否在实体碰撞体内
     */
    pointInEntity(x: number, y: number, entity: GameEntity): boolean;
    /**
     * 射线检测
     */
    raycast(originX: number, originY: number, dirX: number, dirY: number, maxDistance?: number): {
        entity: GameEntity;
        distance: number;
        point: {
            x: number;
            y: number;
        };
    } | null;
    /**
     * 射线与单个实体检测
     */
    private raycastEntity;
    /**
     * 分离两个碰撞的实体
     */
    separate(pair: CollisionPair, ratio?: number): void;
    /**
     * 简单的弹性碰撞响应
     */
    bounce(pair: CollisionPair, restitution?: number): void;
}
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