import { FlatQuestion } from './flat_question';
import { IPoint } from '../doc_controller';
import { IPdfBrick } from '../pdf_render/pdf_brick';
export declare class FlatSignaturePad extends FlatQuestion {
    static BORDER_STYLE: 'dashed' | 'solid' | 'none';
    private _signatureSize;
    private get signatureSize();
    generateBackgroundImage(point: IPoint): Promise<IPdfBrick>;
    private getSignImageUrl;
    generateSign(point: IPoint): Promise<IPdfBrick>;
    generateFlatsContent(point: IPoint): Promise<IPdfBrick[]>;
}