export declare class LinkMath {
    static loopFunction: any;
    static curveFunction: any;
    /**
     * 计算两个节点之间路径的法向量。
     * Calculates the normal vector of the path between the two nodes.
     * @param source the first node
     * @param target the second node
     * @param length the length of the calculated normal vector
     * @returns {{x: number, y: number}}
     */
    static calculateNormalVector: (source: any, target: any, length: any) => {
        x: number;
        y: number;
    };
    /**
     * 计算一个角的弧度
     * Calculates the radian of an angle
     * @param angle
     * @returns {number} the radian of the angle
     */
    static calculateRadian: (angle: any) => number;
    /**
     * 计算的角度
     * @param radian
     * @returns {number} the angle of the radian
     */
    static calculateAngle: (radian: any) => number;
    static calculateCurvePoint(source: any, target: any, l: any): {
        x: any;
        y: any;
    };
    static calculateMultiLinkDistance(l: any, visibleLinkDistance?: number): number;
    static calculateSelfLinkPath(l: any): any;
    /**
     * 计算源节点和目标节点之间的链接点与目标节点的边界相交。
     * Calculates the point where the link between the source and target node
     * intersects the border of the target node
     * @param source the source node
     * @param target the target node
     * @param additionalDistance additional distance the
     * @returns {{x: number, y: number}}
     */
    static calculateIntersection: (source: any, target: any, additionalDistance: any) => {
        x: any;
        y: any;
    };
    static calculateCenter: (firstPoint: any, secondPoint: any) => {
        x: number;
        y: number;
    };
    /**
     * 如果是循环，则计算链接的路径。目前仅适用于环状节点。
     * @param link the link
     * @returns {*}
     */
    static getLoopPoints: (link: any) => {
        x: any;
        y: any;
    }[];
    /**
     *  计算label节点的循环曲线路径
     */
    static calculateLoopPath: (link: any) => any;
}