import { ElementRef } from '@angular/core';
import { D3ChartDirective, D3Element, D3MarginDirective } from './chart';
export declare class D3AreaDirective extends D3Element {
    name: string;
    vertical: boolean;
    xDataName: string;
    yDataName: string;
    yScaleName: string;
    xScaleName: string;
    offset: any;
    stroke: any;
    private _areaElement;
    private _columns;
    private _xScale;
    private _yScale;
    constructor(chart: D3ChartDirective, el: ElementRef, margin?: D3MarginDirective);
    columns: any;
    redraw(): void;
    private getNullArea();
    private getArea();
    private mapColumns(data);
    private mapValues(data, c);
    private readonly x;
    private readonly y;
}