import { IDistancePosition } from '../Interfaces';
import { Curve } from './Curve';
import { Vector2 } from '../../Math';
export declare class CircleCurve extends Curve {
    precision: number;
    length: number;
    distancePositions: IDistancePosition[];
    startPosition: Vector2;
    endPosition: Vector2;
    startPoint: Vector2;
    midPoint: Vector2;
    endPoint: Vector2;
    constructor(startPoint: Vector2, midPoint: Vector2, endPoint: Vector2);
    getPositionAtProgress(t: number): Vector2;
    getPositionAtDelta(delta: number): Vector2;
    getPositionAtDistance(distance: number): Vector2;
    private _initLength;
    static isValid(startPoint: Vector2, midPoint: Vector2, endPoint: Vector2): boolean;
}