interface IOptions {
    width?: number;
    height?: number;
    color?: string;
    bgColor?: string;
    scale?: number;
    openSmooth?: boolean;
    minWidth?: number;
    maxWidth?: number;
    minSpeed?: number;
    maxWidthDiffRate?: number;
    maxHistoryLength?: number;
    onStart?: (event: any) => void;
    onEnd?: (event: any) => void;
}
interface IPoint {
    x: number;
    y: number;
    t: number;
    speed?: number;
    distance?: number;
    lineWidth?: number;
}
interface IRadianData {
    val: number;
    pos: -1 | 1;
}
declare class SmoothSignature {
    constructor(canvas: HTMLCanvasElement, options: IOptions);
    canvas: HTMLCanvasElement;
    ctx: CanvasRenderingContext2D;
    width: number;
    height: number;
    scale: number;
    color: string;
    bgColor: string;
    canDraw: boolean;
    openSmooth: boolean;
    minWidth: number;
    maxWidth: number;
    minSpeed: number;
    maxWidthDiffRate: number;
    points: IPoint[];
    canAddHistory: boolean;
    historyList: string[];
    maxHistoryLength: number;
    onStart: any;
    onEnd: any;
    init(canvas: HTMLCanvasElement, options?: IOptions): void;
    addListener: () => void;
    removeListener: () => void;
    onDrawStart: (e: any) => void;
    onDrawMove: (e: any) => void;
    onDraw: (prePoint: any, point: any) => void;
    onDrawEnd: (e: any) => void;
    getLineWidth: (speed: number) => number;
    getRadianData: (x1: number, y1: number, x2: number, y2: number) => IRadianData;
    getRadianPoints: (radianData: IRadianData, x: number, y: number, halfLineWidth: number) => {
        x: number;
        y: number;
    }[];
    initPoint: (event: any) => void;
    drawSmoothLine: (prePoint: any, point: any) => void;
    drawNoSmoothLine: (prePoint: any, point: any) => void;
    drawCurveLine: (x1: number, y1: number, x2: number, y2: number, x3: number, y3: number, lineWidth: number) => void;
    drawTrapezoid: (point1: any, point2: any, point3: any, point4: any) => void;
    drawBgColor: () => void;
    drawByImageUrl: (url: string) => void;
    addHistory: () => void;
    clear: () => void;
    undo: () => void;
    toDataURL: (type?: string, quality?: number) => string;
    getPNG: () => string;
    getJPG: (quality?: number) => string;
    isEmpty: () => boolean;
    getRotateCanvas: (degree?: number) => HTMLCanvasElement;
}
export default SmoothSignature;