import { BBox } from './types';
/**
 * 两点之间的距离
 * @param {number} x1 起始点 x
 * @param {number} y1 起始点 y
 * @param {number} x2 结束点 x
 * @param {number} y2 结束点 y
 * @return {number} 距离
 */
export declare function distance(x1: number, y1: number, x2: number, y2: number): number;
export declare function isNumberEqual(v1: number, v2: number): boolean;
export declare function getBBoxByArray(xArr: number[], yArr: number[]): BBox;
export declare function getBBoxRange(x1: number, y1: number, x2: number, y2: number): {
    minX: number;
    maxX: number;
    minY: number;
    maxY: number;
};
export declare function piMod(angle: number): number;