export declare class Vector2 {
    constructor(values?: [number, number]);
    static from(p: {
        x: number;
        y: number;
    }): Vector2;
    private values;
    static readonly zero: Vector2;
    static readonly one: Vector2;
    get x(): number;
    set x(value: number);
    get y(): number;
    set y(value: number);
    get xy(): [number, number];
    set xy(values: [number, number]);
    at(index: number): number;
    reset(): void;
    copy(dest?: Vector2): Vector2;
    negate(dest?: Vector2): Vector2;
    equals(vector: Vector2, threshold?: number): boolean;
    length(): number;
    squaredLength(): number;
    add(vector: Vector2): Vector2;
    subtract(vector: Vector2): Vector2;
    multiply(vector: Vector2): Vector2;
    divide(vector: Vector2): Vector2;
    scale(value: number, dest?: Vector2): Vector2;
    normalize(dest?: Vector2): Vector2;
    /**
     * 向量点乘
     * @param vector
     * @param vector2
     * @returns
     */
    static dot(vector: Vector2, vector2: Vector2): number;
    /**
     * 向量长度
     * @param vector
     * @param vector2
     * @returns
     */
    static distance(vector: Vector2, vector2: Vector2): number;
    /**
     * 向量长度平方
     * @param vector
     * @param vector2
     * @returns
     */
    static squaredDistance(vector: Vector2, vector2: Vector2): number;
    /**
     * v2->v1的方向的单位向量
     * @param v1
     * @param v2
     * @param dest
     * @returns
     */
    static direction(v1: Vector2, v2: Vector2, dest?: Vector2): Vector2;
    static mix(vector: Vector2, vector2: Vector2, time: number, dest?: Vector2): Vector2;
    /**
     * 向量加法
     * @param vector
     * @param vector2
     * @param dest
     * @returns
     */
    static sum(vector: Vector2, vector2: Vector2, dest?: Vector2): Vector2;
    /**
     * 向量减法
     * @param vector
     * @param vector2
     * @param dest
     * @returns
     */
    static difference(vector: Vector2, vector2: Vector2, dest?: Vector2): Vector2;
    /**
     * 向量乘法
     * @param vector
     * @param vector2
     * @param dest
     * @returns
     */
    static product(vector: Vector2, vector2: Vector2, dest?: Vector2): Vector2;
    /**
     * 向量除法
     * @param vector
     * @param vector2
     * @param dest
     * @returns
     */
    static quotient(vector: Vector2, vector2: Vector2, dest?: Vector2): Vector2;
}