export interface Point {
    x?: number;
    y?: number;
    amount?: number;
    angle?: number;
}
/**
 * distance between two point.
 */
export declare function getPointDistance(p1: Point, p2: Point): number;
/**
 * Rotate point/vector around origin({x:0,y:0}).
 * @param  {number} radian 弧度值，正为顺时针，负为逆时针. （在标准笛卡尔坐标系中，正度数指的是x正轴逆时针旋转，但我们的坐标系是上下颠倒的）
 */
export declare function rotatePoint(point: Point, radian: number): Point;
export declare function rotatePointDeg(point: Point, degree: number): Point;
/**
 * 计算出 以center为旋转中心，将point旋转radian度后的点
 * @param radian {number} 是弧度值(带PI的），正为顺时针，负为逆时针
 */
export declare function rotatePointAround(point: Point, center: Point, radian: number): Point;
export declare function rotatePointAroundDeg(point: Point, center: Point, degree: number): Point;
export declare function degree2Radian(degree: number): number;
export declare function normalizeVector(vector: Point, len?: number): Point;
export declare function diffPoint(from: Point, to: Point): Point;
export declare function addPoint(pointA: Point, pointB: Point): Point;
export declare function isEqualPoint(p1: Point, p2: Point): boolean;
export declare function isPointLike(pos: any): boolean;
/**
 * @description 判断某个点是否在多边形内部
 * @param {point} point
 * @param {Array.<point>} polygonPoints 多边形的构成点
 * @return {boolean}
 * */
export declare function isPointInPolygon(point: Point, polygonPoints: Point[]): boolean;
/**
 * @description 凸包算法
 * @return {Point[]}
 * */
export declare function convexPointHull(pointList: Point[]): Point[];
export declare function Point(x: number, y: number): Point;