import { vec2 } from 'gl-matrix';
import { Curve } from './curve';
export declare class CubicBezierCurve extends Curve {
    private v0;
    private v1;
    private v2;
    private v3;
    constructor(v0?: vec2, v1?: vec2, v2?: vec2, v3?: vec2);
    getPoint(t: number, optionalTarget?: vec2): vec2;
    getPointAt(u: number, optionalTarget: any): vec2;
}