/** @private Polygon Math */
import type { Penetration } from "../ai/steer";
import { type Rect } from "./rect";
import { type Vec2 } from "./vec2";
export type Poly = {
    points: Vec2[];
    _edges: {
        A: Vec2;
        B: Vec2;
        normal: Vec2;
        dir: Vec2;
        length: number;
    }[];
};
export declare function poly_from_rect(rect: Rect, theta?: number): Poly;
export declare function poly_from_points(inputPoints: Vec2[]): Poly;
export declare function collisionSurface(poly: Poly, p: Vec2): Penetration;
export declare function computeSignedArea(pts: Vec2[]): number;
export declare function findSegmentAtPoint(points: Vec2[], click: Vec2, eps?: number): number;
export declare function closestPointOnSegment(P: Vec2, A: Vec2, B: Vec2): {
    point: {
        x: number;
        y: number;
    };
    t: number;
};
export declare function pointInPolygon(pt: Vec2, poly: Poly): boolean;
export declare function advanceAlongPath(path: Poly, startIndex: number, startPoint: Vec2, distance: number): {
    point: Vec2;
    index: number;
};
export declare function lateralOffset(p: Vec2, a: Vec2, b: Vec2): {
    offset: number;
    normal: Vec2;
    closest: Vec2;
};
export declare function findClosestSegmentIndex(p: Vec2, path: Poly, hint?: number): number;
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