import { IVector } from './i-vector';
import { IPoint } from '../point';
export declare class VectorExtensions {
    static initialize(x?: number, y?: number): IVector;
    static fromPoints(p1: IPoint, p2: IPoint): IVector;
    static vectorLength(v: IVector): number;
    static magnitudeSquared(v: IVector): number;
    static dotProduct(v1: IVector, v2: IVector): number;
    static crossProduct(v1: IVector, v2: IVector): number;
    static subtract(v1: IVector, v2: IVector): IVector;
    static add(v1: IVector, v2: IVector): IVector;
    static scale(v: IVector, value: number): IVector;
    static angle(v1: IVector, v2: IVector): number;
}