import type { IPoint, IPointLike } from '@visactor/vutils';
import type { IDirection, ICurve, IPath2D } from '../../../interface';
export declare abstract class Curve implements ICurve<IPoint> {
    type: number;
    readonly p0: IPoint;
    defined: boolean;
    protected length: number;
    abstract getPointAt(t: number): IPointLike;
    abstract getAngleAt(t: number): number;
    abstract getYAt(x: number): number;
    abstract includeX(x: number): boolean;
    getLength(direction?: IDirection): number;
    protected abstract calcLength(): number;
    protected abstract calcProjLength(direction: IDirection): number;
    abstract draw(path: IPath2D, x: number, y: number, sx: number, sy: number, percent: number): void;
}