export declare function easeInQuad(k: number): number;
export declare function easeOutQuad(k: number): number;
export declare function easeInOutQuad(k: number): number;
export declare function easeOutSine(k: number): number;
export declare function easeOutCubic(k: number): number;
export interface AnimateOptions {
    from: number;
    to: number;
    duration?: number;
    step?: (value: number) => void;
    finish?: (value: number) => void;
    easing?: (k: number) => number;
}
export interface AnimateStop {
    (): void;
    finish(): void;
}
export declare function animate({ from, to, duration, step, finish, easing, }: AnimateOptions): AnimateStop;
interface Point {
    x: number;
    y: number;
}
export declare function getDistanceByTowPoints(p1: Point, p2: Point): number;
export declare function getAngle360(p1: Point, p2: Point): number;
export type Direction = 'right' | 'left' | 'up' | 'down';
export declare function getDirectionByAngle(angle: number): Direction;
export declare function getDirectionByTwoPoints(p1: Point, p2: Point): Direction;
export {};